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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY
Journal Basic Information
Journal DOI :
Korean Academy of Pediatric Dentistry
Editor in Chief :
Volume & Issues
Volume 27, Issue 4 - Nov 2000
Volume 27, Issue 3 - Aug 2000
Volume 27, Issue 2 - May 2000
Volume 27, Issue 1 - Feb 2000
Selecting the target year
A CASE REPORT OF DENTINOGENESIS IMPERFECTA
Kim, Jae-Gon ; Lee, Doo-Cheol ; Lee, Seung-Young ; Lee, Seung-Ik ; Baik, Byeoung-Ju ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 27, issue 1, 2000, Pages 1~6
Dentinogenesis imperfecta is an inherited disorder of dentin formation, usually exhibiting an autosomal dominant mode of transmission. Type I dentinogenesis imperfecta occurs in patients afflicted with osteogenesis imperfecta. Type II dentinogenesis imperfecta is not associated with osteogenesis imperfecta. Type III dentinogenesis imperfecta (Brandywine type) occurs in a racial isolate area in the state of Maryland. In all three types, teeth of both dentitions are affected with variable clinical appearances. The teeth are opalescent with the color ranging from bluish-gray to brown to yellowish. The dentin is abnormally soft, providing inadequate functional support to the overlying enamel. Although the enamel is normal, it fractures or chips away easily, exposing the occlusal and incisal dentin. The exposed soft dentin often undergoes rapid and severe functional attrition. The teeth exhibit bulb-shaped crowns with constricted cementoenamel junctions and thin roots. The teeth will exhibit varying stages of obliteration of the coronal and root pulpal chambers. The cementum, periodontal ligament and supporting alveolar bone appear normal. The enamel is normal. The mantle dentin remains nearly normal, whereas the remaining dentin is severely dysplastic. The dentinal tubules are disoriented, irregular, widely spaced, and usually larger than normal.
ELECTROPHYSIOLOGICAL CHARACTERISTICS OF GABAERGIC INHIBITION IN THE HIPPOCAMPAL CA1 OF THE RAT IN VIVO
Choi, Byung-Ju ; Cho, Jin-Hwa ; Kim, Young-Jin ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 27, issue 1, 2000, Pages 7~14
Inhibitory cells are critically involved in shaping normal hippocampal function and are thought to be important elements in the development of hippocampal pathologies. The present study was carried out in hippocampal CA1 area in vivo to compare with hippocampal slice studies. Intracellular and extracellular recordings with or without bicuculline electrodes were obtained in the intact brain of anesthetized rats, and cells were intracellularty labelled with neurobiotin. Electrical stimulation of fimbria-fornix resulted in an initial short-latency population spike. In the presence of
bicuculline, orthodromic stimulation resulted in bursts of population spikes. The amplitude of population spikes in the CA1 region increased with stimulus intensity, as did the number of population spikes when the field recording electrode contained
bicuculline. We measured the level of excitability in the CA1 area, using a paired-pulse stimulus paradigm to evoke population spikes. Population spikes showed strong paired-pulse inhibition at short interstimulus intervals. Burst afterdischarges up to 400 ms were observed after paired-pulse stimulus. These result suggest that hippocampal CA1 inhibitory interneurons can affect the excitability of pyramidal neurons that can not be appreciated in conventional in vitro preparation.
THE INHIBITORY EFFECT OF STREPTOCOCCUS SALIVARIUS 119 ON THE FORMATION OF ARTIFICIAL PLAQUE
Lee, Min-Ha ; Yang, Kyu-Ho ; Oh, Jong-Suk ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 27, issue 1, 2000, Pages 15~23
Streptococcus salivarius is a normal inhabitant in the human oral cavity. Streptococcus salivarius 119 in this study was isolated from the oral cavity of child and identified, and its action mechanism on the formation of denal plaque by Streptococcus matans was studied. 1. The optical density of absorbance at 550 nm was 0.327 in the culture of Streptococcus mutans in disposable cuvette, whereas being 0.119 in the combined culture of Streptococcus mutans and Streptococcus salivarius 119. 2. The mean weight of produced artificial plaque on the wires in the beaker was 84.7mg in culture of Streptococcus mutans only, whereas being reduced to 12.3mg in the combined culture of Streptococcus mutans and Streptococcus salivarius 119. 3. When Streptococcus mutans was cultured in the media containing culture supernatant of Streptococcus salivarius 119 in BHI broth, the mean weight of produced artificial plaque was 100.5mg on the wires, whereas being reduced to 20.4mg in the media containing culture supernatant of Streptococcus salivarius 119 in BHIS broth. 4. The viable cells of Streptococcus oralis and Streptococcus salivarius 119 were
per ml respectively after each culture, wheras being
per ml in the combined culture of Streptococcus oralis and Streptococcus salivarius 119. 5. The polymer produced by Streptococcus salivarius 119 was glucan on the thin layer chromatography. 6. The glucan produced by Streptococcus salivarius 119 was water-soluble glucan containing
linkages as the main linkage on the thin layer chromatography. These results suggested that isolated Streptococcus salivarius 119 inhibited the formation of artificial plaque by the production of water-soluble glucan.
CARIES DIAGNOSIS BY DIAGNODENT'S LASER FLUORESCENCE DETECTION IN VITRO
Kim, Seong-Hyeong ; Lee, Kwang-Hee ; Kim, Dae-Eop ; Park, Jong-Seok ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 27, issue 1, 2000, Pages 24~31
The purpose of study was to compare the laser fluorescence detection by Diagnodent(KaVo, Germany), visual inspection using dental explorers, and conventional dental radiography as diagnostic tests for dental caries. One hundred and three human premolars and molars which had no caries or fissure caries were tested by the three methods. Diagnodent scores increased as the scores of the other two tests increased(P<0.01) There were significant relationships between visual inspection scores and Diagnodent scores(Pearson 0.676, Spearman 0.694) and between radiography scores and Diagnodent scores(Pearson 0.623, Spearman 0.658) (P<0.01, all). Diagnodent test proved to have high sensitivity and low specificity and more studies are necessary to present the diagnostic criteria for progressive caries stages.
IN VITRO STUDY OF CARIOGENIC POTENTIAL OF INFANT FORMULAS
Park, Deuk-Hee ; Lee, Kwang-Hee ; Kim, Dae-Eop ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 27, issue 1, 2000, Pages 32~39
The purpose of this study was to assess the cariogenic potential of five infant formulas in vitro. as compared with 10% sucrose solution and whole bovine milk. Buffering capacities were determined by the amount of 0.1 N lactic acid consumed to titrate the 50ml specimen solutions to pH 4.0. The pH of the specimen solution inoculated by Streptococcus mutans was measured by pH meter and the surface microhardness of primary tooth enamel immersed in the specimen solution was measured by the microhardness tester, before and after 48 hours incubation. Also, the solubility of calcium from synthetic hydroxyapatite was evaluated by atomic absorption spectrophotometer The buffering capacity of infant formulas was higher than that of sucrose solution and lower than that of milk, and there were significant differences among infant formulas(P<0.01). The average pH of infant formulas after 48 hours incubation was lower than that of sucrose solution and milk, and there was significant difference between infant formulas and milk(P<0.05). There were no signifiant differences among oops in the microhardness change of primary tooth enamel and in the amount of dissolved calcium ion from synthetic hydroxyapatite after incubation with Streptococcus mutans. In conclusion, infant formulas seemed to fulfill the basic requirments to cause dental caries in primary teeth, and there were significant differences of cariogenic potential among infant formulas. Cooperative efforts of dentistry and manufacturers to reduce the cariogenic potential of infant formulas would be necessary to prevent the early childhood caries in children.
INTERRATER RELIABILITY OF CARIES DIAGNOSIS BY DIAGNODENT
Lee, Kwang-Hee ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 27, issue 1, 2000, Pages 40~44
The purpose of study was to measure the interrater reliability of the newly developed caries diagnostic instrument, Diagnodent(KaVo, Germany), using a new laser fluorescence techinique. One hundred and three extracted human premolars and molars were examined by Diagnodent, three times for fissures and five times for smooth surfaces. There was no significant difference among the three fissure means, but two combinations showed significant differences among the five smooth surface means. Correlation coefficients of Pearson and Spearman were all above 0.9(P<0.01). The
values from reliability analysis were 0.9980 or 0.9981 for fissures and 0.9992 for smooth surfaces.
SHEAR BOND STRENGTH OF COMPOSITE RESIN TO ENAMEL FOLLOWING ENAMEL MICROABRASION
Hong, Kee-Sang ; Lee, Sang-Dae ; Lee, Sang-Hoon ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 27, issue 1, 2000, Pages 45~53
Enamel microabrasion is a means by which superficial enamel discoloration is removed using hydrochloric acid and fine pumice. As enamel microabrasion alone may not be sufficient in cases of deeper discoloration, composite resin restoration is recommended in areas where there is remaining discoloration. The purpose of this study was to investigate the effects of different methods and number of applications of enamel microabrasion on the shear bond strength of composite resin to enamel. Untreated control was designated as group 1. 5-second applications of a mixture of 18% HCl and fine pumice were performed 5 and 10 times on groups 2 and 3, respectively. A commercially available mixture of 10% HCl and abrasives(PREMA) was applied using a 10 : 1 gear reduction handpiece 5 and 10 times on groups 4 and 5, respectively, with each application lasting 20 seconds. After etching with 37% phosphoric acid, composite resin was bonded. Thermocycling was performed and shear bond strength was measured. The following results were obtained : 1. Group 2 showed the highest bond strength
, while group 3 showed the lowest
, Shear bond strength decreased in the following order: 2>4>5>1>3. 2. Group 2 showed bond strength significantly higher compared to groups 1 and 3(p<0.05). 3. There were no significant differences between groups 2 and 3, which had been microabraded using HCl and pumice, and groups 4 and 5, to which PREMA had been applied, when bond strengths were compared(p>0.05). 4. When modes of fracture were examined, adhesive failure was observed in groups 3 and 4, while cohesive failure was observed in groups 1, 2, 3 and 4. Only mixed failures were found group 5. 5. When viewed using a SEM, groups 2 and 3, which had been microabraded using HCl and pumice, showed surface appearances similar to that of enamel etched with phosphoric acid. Groups 4 and 5, treated with PREMA, exhibited a smooth surface similar to that of group 1. All oops showed similar, typical surface characteristics following phosphoric acid etching.
A STUDY ON MICROLEAKAGE OF SEALED AMALGAM RESTORATION
Lee, Sang-Heon ; Lee, Jae-Cheoun ; Lee, Sang-Hoon ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 27, issue 1, 2000, Pages 54~61
Amalgam, though a widely used dental material, does not bond to the tooth substrate Therefore, retentive preparation of the cavity is necessary. Such amalgam restorations, until corrosion products form and plug the margin, will show significant marginal leakage. Unless this is prevented early on, saliva and bacteria may enter the cavity causing postoperative hypersensitivity, dissolution and collapse of the restoration, discoloration of the margin and secondary caries, leading to shortened life-span of the restoration and pulpal pathosis. Recently, a method of restoration has been introduced whereby tooth material can be preserved, cavity margin can be sealed and preventive treatment of pit and fissure can be administered while retaining all the advantages of conventional amalgam restorations. Such sealed amalgams involve removing the carious lesion without extending the cavity for prevention and using pit and fissure sealants to seal cavity margins and pit and fissures to reduce microleakage. In this study, finishing of the amalgam and sealant application were performed after different intervals following of amalgam restoration to compare the microleakage of sealed and conventional amalgam restorations. Thirty bicuspids were prepared with Class V cavity preparations on the buccal and lingual surfaces. After amalgam placement, they were divided into the following groups and treated accordingly. Group 1 : Polishing after 24 hours Group 2 : Immediate sealant application without polishing Group 3 : No polishing, but sealant applied after thermocycling 500 times After treatment, the samples were thermocycled 500 times between
with a dwell time of 30 seconds. After thermocycling, the samples were dipped into 1% methylene blue kept in a
incubator at 100% humidity for 24 hours. The teeth were then embedded in resin and cut bucco-lingually along the tooth axis and observed with a stereomicroscope to determine the degree of microleakage, The following results were obtained : 1. Group 2 showed the least microleakeage, while group 1 showed the greatest. 2. Group 1 showed significantly greater microleakage compared to group 2 (p<0.05). However, no significant differences were found between group 1 and 3(p>0.05). No significant differences in microleakage were also found between cup 2 and 3(p<0.05).
FLUORIDE CONCENTRATION IN URINE EXCRETED AFTER FLUORIDE ADMINISTRATION
Lee, Bo-Kyung ; Kim, Tae-Young ; Kim, Chong-Chul ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 27, issue 1, 2000, Pages 62~69
Part of the locally applied, as well as the systemic applied, fluoride is absorbed into the body to aid in the prevention of caries. However, beyond a certain level, systemic distribution of fluoride can cause chronic fluorosis with attending systemic symptoms and dental fluorosis. Thus it is vital to determine the level of fluoride with minimal side effects which will provide optimal caries prevention. A commonly utilized method of regressively determining fluoride intade is to measure the fluoride concentration of excreted urine. Thus, the aim of this study was to determine the clearance time and concentration of fluoride in urine after administration of various doses of fluoride using HMDS-diffusion technique and fluoride ion electrode(Orion, 96-09, U.S.A.). Urine samples were collected in 7 adult subjects every morning after administration of fluoride supplements such as no fluoride(control group), 1mg fluoride(group 1), 2mg fluoride(group 2), 3mg fluoride(group 3), 4mg fluoride(group 4). The obtained results were as follows 1. Mean urinary fluoride concentration of control group was
. 2. Fluoride levels followed as group 4(4.076ppm). group 3(2.400ppm), group 2(1.494ppm), group 1(1.051ppm) at day 1 after fluoride administration. There were no statistical differences between the urinary fluoride concentration of group 1, 2, 3 and control group after day 2, but there was statistical difference between group 4 and control group at day 2(p<0.05). 3. Urinary fluoride concentration increased and plateaued according to increasing fluoride dosage. The increased concentration remained significantly higher till day 2, but after day 3, there was no significant difference compared to the control.
DENTAL MANAGEMENT OF THE PATIENT WITH BILIARY ATRESIA : A CASE REPORT
Baik, Byeong-Ju ; Yang, Yeon-Mi ; Lee, Seung-Ik ; Kim, Jae-Gon ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 27, issue 1, 2000, Pages 70~76
Congenital biliary atresia with progressive sclerosis of the intra- and extra-hepatic duct system occurs in 1 : 10,000 live births, and has a poor prognosis with an expected survival of less than 5 years. Etiology of biliary atresia is unclear, however, it is believed a genetic or developmental cause. The clinical characteristics include pronounced jaundice, hepatosplenomegaly, pruritus, steatorrhea, xanthomas, growth retardation, portal hypertension, bleedings, ascites and respiratory infections. Oral manifestations have seldom been reported in patients with biliary atresia, but there may be enamel hypoplasia, delayed tooth eruption, and green teeth. Early diagnosis and surgical intervention have decreased morbidity. returned growth and development to normal and improved the prognosis for survival. Authors report the clinical and radiologic characteristics, proper managements about two cases with biliary atresia.
EVALUATION OF THE GENOTOXICITY OF FERRIC SULFATE BY COMET ASSAY
Kang, Ho-Seung ; Kim, Shin ; Jeong, Tae-Sung ; Park, Hae-Ryoun ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 27, issue 1, 2000, Pages 77~84
Although ferric sulfate has been proposed as an alternative to formocresol in pulpotomy treatment in primary teeth, it has been given little concern regarding its cytotoxicity and mutagenicity. In the present study, we assessed the in vitro genotoxic effect of a ferric sulfate on human gingival fibroblast cell line (HGF-1). DNA damage was evaluated using comet assay (single cell alkaline gel electrophoresis) and obtained the results as follows: 1. A dose-response relationship was found between ferric sulfate concentrations (0 to 5mM) and DNA damages. 2. Above the concentration of 0.1mM, DNA damage was significantly increased than those of the control (p<0.05). 2. At the fixed concentration of 0.05mM, no significant difference was found between exposure time and DNA damage. These findings suggest that ferric sulfate as a pulpotomy agent can induce DNA damage in human gingival fibroblasts.
A COMPARISON OF THE SHEAR BOND STRENGTHS BETWEEN CONVENTIONAL COMPOSITE SEALANTS AND FLUORIDE-RELEASING SEALANTS
Kim, Shin ; Jeong, Tae-Sung ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 27, issue 1, 2000, Pages 85~89
There has recently been some trials to add the fluoride-releasing property to existing fissure sealants and some of them are already commercially available. But, some questions mat naturally be arisen regarding the potential decrease of physical properties by adding the fluoride despite its new caries-inhibiting abilities. This study was performed for the purpose of comparing the shear bond strengths of conventional composite sealant, Fluoride-releasing sealant and glass ionomer sealant, and obtained the results as fellows. 1. Two kinds of composite sealants (Helioseal and Teethmate-A) showed slightly higher bond strength than Fluoride-releasing sealant(Teethmate-F) without any significance(p>0.05). 2. Class ionomer sealant (Fuji III) was much lower than composite sealant in shear bond strength(p<0.05). 3. With the result of this study, it was found that there is little effect on retentive properties of sealants by adding fluoride to amplify the caries-inhibiting properties.
FACTORS INFLUENCING THE FORMATION OF INSOLUBLE GLUCAN BY STREPTOCOCCUS SOBRINUS
Chung, Jin ; Kim, Shin ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 27, issue 1, 2000, Pages 90~97
There are various kinds of factors associated with the formation of dental plaque in oral cavity such as nutrient molecules and chemical agents. The factors influencing the formation of insoluble glucan by Streptococcus sobrinus and its replication were examined on orthodontic wires. The results were as follows: 1. Insoluble glucan was well produced in the media initially adjusted at pH 7.0 than pH 5.5 or pH 8.5 like bacterial replication. 2. The synthesis of insoluble glucan and bacterial replication were significantly increased in the media containing 2.5% yeast extract. The formation of insoluble glucan was inhibited by 10 folds in the media containing 20% of sucrose than 1.25%, but the replication of bacteria was increased by 20 folds. 3. Insoluble glucan was significantly formed at a concentration of 1.0mM of calcium chloride, 40mM of potassium chloride, 0.1mM of magnesium chloride, while the replication of bacteria was little influenced by them regardless their concentration. 4. The formation of insoluble glucan and bacterial replication were significant in the media containing 10mM of sodium bicarbonate, but both were completely inhibited at 100mM or above. The production of insoluble glucan and the bacterial replication were largely decreased at 10mM of Tris while insoluble glucan was formed in abundance at 100mM of Tris. 5. The synthesis of insoluble glucan and the bacterial replication were inhibited at 10mM or above of sodium phosphate and potassium phosphate.
TREATMENT OF ECTOPIC ERUPTING MANDIBULAR FIRST PERMANENT MOLAR CAUSED BY IMPROPERLY RESTORED STAINLESS STEEL CROWN : CASE REPORT
Park, Chu-Seok ; Choi, Byung-Jai ; Sohn, Heung-Kyu ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 27, issue 1, 2000, Pages 98~102
Ectopic eruption is out of a normal position by local eruption disturbance in the developing permanent molar. The prevalence of ectopic eruption is reported to be the between 2 and 6%, most often associated maxillary first permanent molar whereas, the occurrence for the mandibular is quite rare. The etiologic factors of ectopic eruption are inadequate arch length, lack of growth in the posterior region of the jaw, mesially inclined eruption path of first permanent molars, abnormally large first permanent molars, hereditary factor and a stainless steel crown which has been improperly restored. Ectopic eruption can be treated by the use of brass wire, separating elastics, distal disking and Humphrey appliance and the use of removable appliance and cervical traction headgear after extraction of the second primary molar. This case was that lower right first permanent molar was mesially tilted state by locking on the stainless steel crown of a lower right second primary molar. The stainless steel crown was removed and Humphrey appliance was set. Like this case, ectopic eruption could be happened by the stainless steel crown which improperly restored. In restoration of the stainless steel crown, selection of proper size, trimming and contouring are very important.
PULSE OXIMETER AS A DIAGNOSTIC TEST OF PULP VITALITY
Koo, Bon-Kyung ; Lee, Jae-Ho ; Lee, Jong-Gap ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 27, issue 1, 2000, Pages 103~107
Traditionally, EPT and thermal tests were used as diagnostic methods for pulp vitality test. The thermal and electrical stimulation tests are the methods to determine the vitality of a tooth based on its neuronal response. These have certain limitations, one of them is the difficulty of approaching the correct result in case of treatment of children. The reason is management problem caused by the unpleasant stimulation. Also, the response from patients are not objective, and false positive or false negative could be happened. Recently, laser doppler flowmetry and pulse oximeter which evaluate vascular integrity are introduced in an effort of overcoming to limitation of traditional methods. The principle of pulse oximeter is to and out level of oxygen saturation by ratio of the two pulses between emitted light and detected light penetrating them to the termination of body, such as ears or fingers. From this point of view, it can be applied to a tooth to determine its vitality. The objective of this study lies mainly on varifying pulse oximeter as a method of determining tooth vitality and providing basic data of its clinical implementation. The result of the research showed that level of oxygen saturation in vital teeth was average of 96.3% and 0.0% in pulpless teeth. As a comprehensive result, pulse oximeter could be an useful diagnostic equipment in determining of tooth vitality.
HYPOPHOSPHATEMIC RICKETS : CASE REPORT
Park, Yoon-Hee ; Choi, Byung-Jai ; Lee, Jong-Gap ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 27, issue 1, 2000, Pages 108~112
Hypophosphatemic rickets is lack of reponse to physiologic doses of vitamin D, different from the vitamin D-dependent rickets. It is inherited in an X-linked dominant fashion. The prime features of this disorder are lowered serum phosphate levels, elevated serum alkaline phosphatase and normal serum calcium levels. The dental manifestation often include apical radiolucencies, abscess and fistulas of clinically sound teeth. Dental radiographs show ricketic bone trabeculations, abscent or abnormal lamina dura and abnormal cementum. This case which was diagnosed to hypophosphatemic rickets, showed multiple spontaneous periapical abscess and gingival fistula enlarged pulp chambers, extension of the pulp horns into the cusp tips and delayed eruption.
THE STUDY ON THE ORTHODONTIC PATIENTS WHO VISITED DEPARTMENT OF PEDIATRIC DENTISTRY, CHONNAM NATIONAL UNIVERSITY HOSPITAL
Yang, Kyu-Ho ; Choi, Nam-Ki ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 27, issue 1, 2000, Pages 113~121
This study was aimed to provide an epidemiologic study so that we could accommadate their orthodontic needs adequately and to obtain the reliable quantitative information regarding the characteristics of orthodontic patients who visited the Department of pediatric dentistry, Chonnam National University Hospital from 1986 to 1999, October. The results were as follows. 1 The total number of orthodontic patients were 1,381(male 658, female 723) and the number of annual patients showed irregular trend and the number of male were slightly higher than that of female. 2. According to the investigation made by age group, the group of under 5 years, 6 to 7, 8 to 9, 10 to 11, 12 to 13 and above 14 years showed 8.4%, 29.6%, 34.3%, 21.2%, 5.7% and 0.8%, respectively. 3. The patients corresponding to primary dentition were 15.7% of total patients and mesial step, distal step and flush terminal plane were 83%, 4.6% and 12.4% respectively. By the way 82% of mesial step had anterior crossbite at the same time. 4. The patients corresponding to Angle classification were 84.3% of total patients and Class I malocclusion, Class II div. 1, Class II div. 2 and Class III was 34.7%, 34.6%, 2.1% and 28.6%, respectively.
A STUDY ON THE WIDTH OF ATTACHED GINGIVA IN CHILDREN
Yoo, Ihn-Ah ; Kim, Jung-Wook ; Lee, Sang-Hoon ; Kim, Chong-Chul ; Hahn, Se-Hyun ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 27, issue 1, 2000, Pages 122~134
The aim of this study is (1) to establish the baseline information concerning the width of keratinized gingiva, depth of gingival sulcus and width of attached gingiva on the buccal surface of the teeth: and (2) to determine the relationship between the above values and tooth eruption: and (3) to estimate the frequency of mucogingival problems. The results were as follows; 1. The mean width of attached gingiva of the children aged
proved to be wider in the maxilla than in the mandible. Of the primary teeth, the widest width was found in the areas of maxillary primary lateral incisors and maxillary primary canines(3.50mm and 3.55mm). The narrowest was noted in the area of mandibular first primary molars(1.34mm) In the permanent dentition, the greatest width was found in the areas of maxillary permanent lateral incisors (3.00mm). The narrowest was noted in the area of mandibular first premolars(0.55mm). 2. In the primary dentition, the width of attached gingiva of primary canines and first and second primary molars became wider from the age of six as the age increased. In the permanent dentition of the boys, only mandibular central incisors and maxillary first molars showed the tendency towards increase in the width of attached gingiva with increasing age. In the permanent dentition of girls, central and lateral incisors of both jaws and maxillary first molars showed statistically significant increase in the width of attached gingiva with increasing age(p<0.05). 3. At the age of tooth change, the attached gingiva of primary teeth were almost wider than those of successive permanent teeth (p<0.05). 4. During the period of 6 to 12 years of age, the width of keratinized gingiva and the depth of gingival sulcus of permanent tooth at the age of twelve were larger than those of primary tooth at the age of six (p<0.05). 5. The maximum in the frequency of mucogingival problems was found in the areas of upper and lower first primary molars of primary dentition, and in the upper and lower first premolars of permanent dentition regardless of sex. The frequency was higher in primary teeth than in the corresponding successive permanent teeth These teeth showed tendency towards increase in mucogingival problems with age.
A CROSS-SECTIONAL LONGITUDINAL CEPHALOMETRIC STUDY ON CRANIOFACIAL SKELETAL CHARACTERISTICS IN KOREAN CHILDREN AGED 6 TO 14 WITH CLASS III MALOCCLUSIONS
Park, Soo-Bae ; Choi, Yeong-Chul ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 27, issue 1, 2000, Pages 135~145
It is well known that there are different craniofacial skeletal groups in the same malocclusion types. The present study was performed to determine morphologic sub-groups in Korean children with Class III malocclusions, and to find out morphological differences between subgroups by means of a cross-sectional longitudinal cephalometric study. In this study, 135 children aged 6 to 14 year-old with untreated Class III malocclusions were selected. The samples were divided into two groups depending on the angulation of middle cranial fossa (MCF). That is, when the MCF of an individual was measured smaller than 40.3, he/she was tossed into mandibular protrusive-effect group(MREG), while when an individual was measured larger than 40.3, he/she was tossed into mandibular retrusive-effect group(MREG). Thereafter, the grouped samples were divided into 4 age groups(7, 9, 11 and 13 year-old). Thirty four linear and angular measurements on the tracings of lateral cephaloradiographs were measured, and the morphological characteristics and differences were compared and analysed by means of Wilcoxon test. It was found that Korean children with Class III malocclusions were divided into two groups, in which 39.3% were belonged in the MREG and 60.7% were in the MREG. In the MREG, anterior-posterior length of cranial base, nasomaxillary complex, maxilla and mandible were larger than the MREG. And although there was no difference in the total length of mandible (Co-Gn), mandibular body length (Go-Gn) was larger in the MREG during the majority of the observed periods. These results would suggest that a majority of the samples, 60.7%, demonstrated many of configurations of craniofacial skeletal relationships that can be found in the leptoprosopic faceform.
PROSTHETIC DENTISTRY PROCEDURES OF PERSONS WITH DISABILITIES UNDER GENERAL ANESTHESIA : A CASE REPORT
Lee, Jeong-Ok ; Lee, Keung-Ho ; Choi, Yeong-Chul ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 27, issue 1, 2000, Pages 146~150
Dental caries and periodontal disease continue to present unique problems in the dental management of the persons with disabilities because the chronicity of oral diseases complicates the primary physical or mental disability. The increased prevalence of dental disease in most persons with disabilities is probably not due to any inherent proclivity for dental disease but more likely evolves because dental care receives less attention. Prosthetic dentistry procedures are not contraindicated for most patients with physical and mental disabilities. Fixed bridges may be feasible if the patient or care provider can maintain adequate oral hygiene and the patient's disability dose not preclude this type of prosthesis. Removable partial or full dentures may be indicated if the patient or care provider can easily remove the prosthesis and care for it. Although most persons with disabilities need no additional behavior management modalities to complete dental care, some persons require professionally recognized behavior management techniques during treatment, such as physical restraint, pharmacologic agents, or general anesthesia. Hospitalization and the use of general anesthesia are sometimes required to deal effectively with the extreme management problem patient. This patient with mild mental retardation was fearful of dental treatment. Routine restorative, surgical and prosthetic dentistry procedures were performed under general anesthesia.
THE CYTOTOXICITY OF PULPOTOMY MEDICAMENTS ON HUMAN PULP FIBROBLAST CELLS
Lee, Yeong-Hee ; Lee, Keung-Ho ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 27, issue 1, 2000, Pages 151~160
The effect of concentration as factor in cytotoxicity, protein synthesis and alkaline phosphatase activity was compared for pulpotomy medicaments (formaldehyde, formocresol, paraformaldehyde, ferric sulfate) Human pulp fibroblasts were exposed to a range of concentrations(0.01, 0.05, 0.10, 0.25, 0.50,
) of each agents, for period of 24hrs. The cell activities were evaluated by MTT assay, protein assay and alkaline phosphatase activity examination. The results as follows : 1. After 24hrs culture, pulp fibroblasts adding formaldehyde, formocresol and paraformaldehyde were suppressed cell activities with concentration increasing, but, no depression of cell activities by ferric sulfate. No significant difference was in formaldehyde, formocresol and paraformaldehyde. 2. Protein synthesis by pulpotomy agents were not significant difference in pulp fibroblasts but protein synthesis were a little decreased by paraformaldehyde. 3. Alkaline phosphatase activity was a little decreased by pulpotomy medicaments.
A STUDY ON THE CARIES ACTIVITY TEST WITH VISIBLE LIGHT INDUCED BY LASER
Lee, Sang-Ho ; Lee, Nang-Young ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 27, issue 1, 2000, Pages 161~168
The purpose of this study was to develop a practical caries activity test using laser fluorescence. The subjects of study were 30 children of
years old. Fluorescence from initial carious lesion of teeth illuminated by an argon laser(488nm) was observed through barrier alter. For evaluation of accuracy and propriety of this method fer caries activity test, teeth with initial caries lesion on buccal or labial surface of children was examined with visual inspection and laser fluorescence. Visual examination for the dDfFtT and the
test were also done. The results from the present study can be summarized as follows: 1. Laser fluorescence test could differentiate initial caries lesions more easily than visiual inspection. 3. There was highest correlation(= 0.73) between laser fluorescent test and
test and. And also apparent correlation(= 0.66) exists between laser fluorescent test and caries experience measured by dDfFtT.
DEVELOPMENT OF HIGH SENSITIVE MODEL OF CARIES ACTIVITY TEST FOR EARLY DIAGNOSIS OF DENTAL CARIES
Lee, Sang-Ho ; Lee, Chang-Seop ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 27, issue 1, 2000, Pages 169~179
The purpose of this study is to develop the system which convert the optical difference of teeth texture between intact enamel and incipient caries lesion into shade difference by laser fluorescence and to develop new and simple caries activity test using laser fluorescence. The experimental design of this study consists of three parts. In first part, a new method for the in vitro assessment of changes in initial enamel caries lesion of Bovine teeth using laser fluorescence is tested. In second part, in vivo assessment undertaken. Number of teeth which showed incipient carious lesion on buccal surface examined by laser fluorescence was compared with the caries activity test of
test and other oral environmental test of dDfFtT. In third part, new caries activity test measured by laser fluorescence was developed on the basis of above results and evaluated the sensitivity, specificity, and diagnostic power. Optical density measured by laser fluorescence was increased as increasing the depth of incipient carious lesion and showed high correlation
with lesion depth. Optical density showed direct proportion to lesion depth. Linear equation was obtained between the optical density and the lesion depth by regression analysis. The result of caries activity test with laser fluorescence showed high correlation with those of
test and dDfFtT examination. Caries activity test with laser fluorescence showed 48% of sensitivity, 52% of specificity, and 45% of diagnostic power on the basis of dDfFtT examination, and also showed 48% of sensitivity, 51% of specificity, and 36% of diagnostic power on the basis of
test. In regard above result, caries activity test with laser fluorescence considered to be reliable for caries activity test compared with other oral environmental test. and it was also considered to be practical because it would be simple, inexpensive, and time saving method.