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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 23, Issue 4 - Nov 1996
Volume 23, Issue 3 - Aug 1996
Volume 23, Issue 2 - May 1996
Selecting the target year
IMMUNOHISTOCHEMICAL STUDY ON THE POSTNATAL DEVELOPMENT OF DENTAL PULP INNERVATION IN RAT POSTERIOR TEETH
Kim, Dong-Gil ; Kim, Hyun-Jung ; Nam, Soon-Hyun ; Bae, Yong-Chul ; Kim, Young-Jin ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 23, issue 4, 1996, Pages 775~787
The purpose of this study was to investigate the postnatal development of pulpal innervation with the tooth development and eruption process in developing rat mandibular molars (postnatal 1, 5, 10, 15, 20, 25, 35day-old and adult rats). Immunohistochemical method was carried out for the detection of nerve fibers, using the antibody against calcitonin gene-related peptide(CGRP). The results were as follows: The feature of CGRP-IR nerve fibers were shown in a bead-like appearance. The time of nerve entering into the dental papilla of tooth follicle began at the occured advanced dentinogenesis. The development of Raschkow plexus began at the formative stage of the roots and was accelerated at the stage of the crown emerged into the oral cavity. The number of nerve fibers entering the odontoblastic layer increased with the tooth eruption and mastication. The development of innervation was shown to be related with the stage of the development of individual teeth rather than the chronological age of the rat.
A COMPARATIVE STUDY ON THE ACCURACY OF PREDICTION METHODS OF UNERUPTED CANINE AND PREMOLARS IN THE MIXED DENTITION
Lee, Eun-Young ; Choi, Yeong-Chul ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 23, issue 4, 1996, Pages 788~799
The purpose of this study was to determine the accuracy of the prediction methods which are frequently used in the clinic, such as Moyers', Tanaka and Johnston's, Song's Hixon and Oldfather's, Kaplan's, Smith's. These prediction methods were compared to the data, which were obtained from 100 Kyung-Hee University students (50 males and 50 females) with normal occlusion of permanent dentition, using a retrospective statistical analysis. The standard periapical radiopgraphs for the lower premolars using 16-inch long cone technique and the yellow stone dental casts were taken from each samples. The mesiodistal widths of 4 incisors, canine, premolars were measured on the dental casts, and those of premolars were measured on the radiographs. The correlation coefficients, paired samples t-tests, regression coefficients between the actual measuredments of the samples and the predicted measurements of each methods were analyzed. The results obtained were as follows: 1. The prediction methods using periapical radiographs tended to show a stronger correlation than the methods using dental casts; the correlation coefficients between the actual widths of the lower canine and premolars and the predicted widths of the tested methods were higher in Smith, Kaplan, Hixon & Oldfater, and Tanaka & Johnston (p<0.001). 2. The Moyers' probability chart at 65 % showed a tendency toward the least difference between the actual measurements and the predicted widths of the lower canine and the premolars, and the methods of Smith, Kaplan, Tanaka & Johnston also showed a less difference. 3. By means of evaluation in correlation coefficients and paired smaples t-tests, the Smith and Tanaka & Johnston in male, and the Moyers' 65 % and Song in female showed a high tendency toward accurate methods. 4. The regression equations by models that are derived from the study were as follows: Male(Lt.) :Y=10.799+0.475X Femle(Lt.) :Y= 7.427+0.609X (Rt.) :Y=11.043+0.462X (Rt.) :Y= 8.475+0.556X 5. The regression equations by radiographs that are dericed from the study were as follows: Male(Lt.) :Y=6.5651+0.9720X Femle(Lt.) :Y=4.8656+1.0632X (Rt.) :Y=7.8610+0.9060X (Rt.) :Y=4.5483+1.0843X
A STUDY ON THE EFFECT OF AMALGAM CAVITY LINER APPLICATION ON THE MARGINAL LEAKAGE AND RETENTION OF AMALGAM RESTORATIONS
Kim, Tae-Sung ; Kim, Jong-Soo ; Kim, Yong-Kee ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 23, issue 4, 1996, Pages 800~817
In this study, we tried to evaluate the effect of Amalgambond liner application on the degree of marginal leakage and retention of amalgam restoration by comparing with that of the Copalite and All-bond 2. The results obtained from this experiment were as follows; 1. Tensile strength representing the bond between amalgam and tooth structure was the highest in Amalgambond, and All-Bond 2, Copalite in descending order. There were statistically significant difference between each group(P<0.05). 2. The degree of microleakage in Amalgambond was lower than that of All-Bond 2, and Copalite, but no stastically significant difference could be found (P>0.05). 3. The liner such as Amalgambond or All-Bond 2 were evaluated to be superior to the conventional Copalite in bond strength as well as in microleakage. But the result of this study could not show the superiority of one material over the others; Amalgambond and All-bond 2. Besides the results of the study, other factors, such as practical convenience, should be considered in determining the selection of material. The support of welldesigned clinical studies on this subject are in demand.
FINITE ELEMENT ANALYSIS OF STRESS TRANSMITTED TO THE PULPOTOMIZED PRIMARY MOLARS TREATED BY VARIOUS TEMPORARY FILLING LOADED AT DIFFERENT CONDITION
Kim, Dong-Su ; Kim, Jong-Soo ; Kim, Yong-Kee ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 23, issue 4, 1996, Pages 818~839
The strain gage, holographic and photoelastic analysis etc. have been used for stress analysis of prosthesis, orthodontic or orthopedic appliances and filling materials. But these methods has some limitation in analyzing the internal stress. The Finite Element Analysis has been proved to compensate this defect and widely used in this area. The purpose of this study was to compare the stress distributions of the various temporary filling methods being used in pulpotomy procedure. Three different models were designed according to temporary filling material and method: amalgam filling with ZOE base(Model I), amalgam filling with ZPC sub-base and ZOE(Model II), IRM filling only(Model III). The results of the experiment were as follows: 1. In model I under the load case 6 and 1, the significant stress was shown to be concentrated on the buccal portion of crown. 2. Model II showed the similar pattern of stress distribution to Model I. 3. In model III under load case 2, the stress was mainly distributed on the buccal cusp tip and buccal margin of filling material. In same model under the load case 3, the stress was distributed on the lingual cusp tip. 4. Based on the above data, IRM can be assumed to have advantage over the other tested materials in reducing the incidence of crown fracture by localized the stress within the filling materials.
A COMPARATIVE STUDY ON THE ANTICARIOGENICITY OF ENAMEL SURFACE ADJACENT TO RESIN RESTORATION POLYMERIZED BY VISIBLE LIGHT OR ARGON LASER.
Park, Young-Soo ; Kim, Jong-Soo ; Kim, Yong-Kee ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 23, issue 4, 1996, Pages 840~858
The main purpose of this study was to evaluate the anticariogenic effect of argon laser. Histological observations on lesion initiation and progression were performed under the polarized microscope. The results from the present study can be summarized as follows; 1. The specimens of laser cured group were shown to have more irregular and discontinuous lesion body in general than visible light cured group with rather continuous positive birefringence. 2. With lesion initiation and progression, almost all the specimens showed deeper body of lesion with shallower intact surface zone in the visible light cured group than the laser cured group(p<0.05). When the comparision was made between the two argon laser cured groups, the single-cure group showed deeper lesion body and the shallower surface layer than double-cure group. 3. Based upon the above mentioned results of this study, it can be assumed that the use of argon laser in the procedure of resin polymerization may provide the child and adolescent patient population with anticariogenic effect as well as efficient polymerization. Further studies using various materials and experimental conditions are being encouraged.
SURIGICAL EXPOSURE AND ORTHODONTIC TREATMENT OF THE IMPACTED FIRST MOLAR
Yoo, Jeang-Min ; Kim, Jong-Soo ; Kim, Yong-Kee ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 23, issue 4, 1996, Pages 859~866
It is a relatively rare clinical experience to see the impacted first molar. The first permanent molar is the key in normal occlusion. Abnormal eruption of the first permanent molars would inflict normal development of dental arches and give rise to abnormal root resorption of the adjacent teeth. Therefore, the abnormally erupted first permanent molars should be detected and treated early in order to obtain proper occlusal guidance in mixed dentition period. This report presents two cases on distally tilted and impacted mandibular first molars which were treated by surgical exposure and orthodontic traction using facial mask.
THE COMPARATIVE STUDY ON THE SHEARBOND STRENGTH AND THE MORPHOLOGY OF RESIN-DENTIN INTERFACE BONDED BY SEVERAL DENTINAL BONDING SYSTEM
Kim, Yun-Cheol ; Kim, Yong-Kee ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 23, issue 4, 1996, Pages 867~886
The purpose of this study was to evaluate the shearbond strength and resin-dentin interface of three different dentinal bonding systems in primary and permanent teeth. Thirty extracted human primary molars and premolars, which were non-carious and free of obvious defect, were selected for this study. All specimens were divided into six groups with two groups allocated for each of the three dentinal bonding system(All-bond 2, Scotchbond Multi-Purpose, Gluma bonding system). After completion of bonding composite to dentin using each tested dentin bonding system, bond strength measurement and histological observation were performed. The results are as follows: 1. All-bond 2 and Scotchbond Multi-Purpose, A good quality hybrid layer was identified, the morphology of which could be equated with the zone of H-E and Brown-Brenn staining. In Gluma bonding system, hybrid layer was very thin, and separated from the solid polymer. 2. All-bond 2 had the highest mean shearbond strength, followed by Scotchbond Multi-Purpose and Gluma bonding system in both primary and permanent teeth. There was no statistically significant difference between All-bond 2 and Scotchbond Multi-Purpose. Statistically significant difference could be found between Gluma bonding system and the other two groups(p<0.05). 3. The fracture patterns observed were mainly the mixture of adhesive failure and dentin dettachment pattern in All-bond 2 and Scotchbond Multi-Purpose while adhesive failure prevailed in Gluma bonding system.
A CONSIDERATION ON THE PULSE OXIMETRY FOR VITAL SIGN MONITORING
Kim, Shin ; Chung, Tae-Sung ; Park, Yang-Hyun ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 23, issue 4, 1996, Pages 887~892
For the purpose of assessing the utility and cautionary aspects of pulse oximetry of which use is rapidly increased, it was applied to the maladaptive child patients with sedative drugs and evaluated the results. When pulse oximeter was used alone for vital sign monitoring, it was thought impossible to exclude the false alarm or false silence by various causes. To minimize or remove these misunderstanding, operators should have a extensive knowledge not only on the factors affecting the operation of this apparatus but also on the potential of misoperation. To review the present status of increasing risk of hypoxia during the sedation, it was thought unreasonable to solely depend upon this apparatus for vital sign monitoring. By combining with more accurate and auxiliary monitoring devices, pulse oximetry will be of greater value and can meet the clinical needs and conveniences.
A CONSERVATIVE APPROACH FOR THE NON-INFLAMMATORY GINGIVAL RECESSION IN MIXED DENTITION
Kim, Shin ; Min, Yun-Kyung ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 23, issue 4, 1996, Pages 893~898
The occlusal disharmonies resulted from labially protruded or malpositioned teeth can damage the periodontium and induce the non-inflammatory gingival recession. For these cases, a conservative approach was performed by improving oral hygiene and correcting the axial and positional status of the gingivally recessed teeth and removing the prematurely contacted areas. In some cases, rapid remission of tooth mobility and gradual decrease of gingival recession was observed just after start of treatment. In cases of gingival recession in permanent lower incisors of the children with mixed dentition, the treatment of choice is non-surgical conservative approaches. In cases when the gingival inflammation can be controlled through reinforcing the oral hygiene, when attached gingiva have a potential to increase in width through growth (not more than 1 year after eruption or not yet arrived at adult level), and when the recession can be corrected by moving the teeth from labial cortical plate through orthodontic treatment, the conservative measures would be the first choice. On the contrary, when recession has exceeded beyond the level of CEJ, when the gingival inflammation existed with the cause of poor oral hygiene, when the attached gingiva have little potential to increase (for example, more than 8 years after eruption), and when the conservative measures yielded no benefit after 4-8 weeks of treatment, the surgical approaches should be sought.
MICROLEAKAGE OF COMPOSITE RESINS POLYMERIZED WITH ARGON LASER AND VISIBLE LIGHT
Jang, Ki-Taeg ; Chung, Tae-Ryun ; Kim, Chong-Chul ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 23, issue 4, 1996, Pages 899~905
For the purpose of evaluation of microleakage of class V resin restoration, 64 extracted bovine teeth were filled with two kinds of light curing composite resins(Z-100, Clearfil) and polymerized with 40 seconds of visible light and with 10 seconds of argon laser. After 1000 thermocycling(
), specimens were placed in 1 % methylen blue dye solution for 72 hours in
water bath. The specimens were sectioned at center of filling body and the degree of dye penetration was observed with a stereomicroscope. The following results were obtained, 1. Differences of the microleakage of resin restorations polymerized with 10 seconds of argon laser and 40 seconds of visible light were statistically insignificant. 2. There was more microleakage in Z-100 than clearfil and there was a statistical significancy (p<0.05).
A COMPARATIVE STUDY OF MICROHARDNESS OF DUAL-CURE AND LIGHT-CURE PIT AND FISSURE SEALANT
Lee, Kwang-Soo ; Kim, Hyung-Doo ; Lee, Sang-Hoon ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 23, issue 4, 1996, Pages 906~914
Due to the various reason, sealing of pit & fissure might be imperfect. One of these reason can be the fracture of sealant material because of the low hardness value of sealing material. The purpose of this in vitro study was to evaluate the microhardness of two different curing type pit and fissure sealants: Dual-cure and Light-cure. The result from the present study can be summarized as follows: 1. All pit and fissure sealants that used in this study showed statistically significant difference in their microhardness of upper and lower surface. (P <0.05) 2. Except of lower surface of teethmate, microhardness of 40-second curing sealant was statistically higher than that of 20-second curing sealant. (P <0.05) 3. In comparison of sealants, microhardness of dual-cure sealant was statistically higher than that of light-cure sealant. Above results suggest that the use of dual-cure sealant and longer curing time are recommended.
A COMPARATIVE STUDY ON SURFACE ROUGHNESS OF GLASS IONOMER CEMENT BY SURFACE COATING AGENT
Choi, Byung-Jai ; Hwang, Dong-Hwan ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 23, issue 4, 1996, Pages 915~924
The purpose of this paper is to investigate the surface roughness of glass ionomer cement during initial setting time followed by applying surface coating agent. No other finishing or polishing procedure is done and each surface coating agents (varnish, adhesive, gloss, sealant) are used after filling of glass ionomer cement. Surface roughness indices(Ra) are measured and surface contours are obtained electronically by Surfcorder SEF-30D(Kosaka laboratory Ltd., Japan). The results are as follows: 1. During initial setting time, surface roughness increases slightly regardless of surface coating agents. But it is statistically insignificant. (p>0.05) 2. Among surface coating agents used, Ra indices of group using varnish are high significantly compared to other groups regardless of elapsed time.(p<0.05) Among the groups which has used other surface coating agents except for the varnish group, similar Ra index all over the experiment is obtained, when compared to control group (no agent). 3. If no surface treatment is performed, tri-cure glass ionomer cement (Vitremer) has higher Ra Index than light cure glass ionomer cement (Fuji II LC) (t<0.05). But there is no difference between two groups in Ra index if any kinds of agents are applied except for sealant. (t>0.05)
CORRELATION OF DENTAL BEHAVIOR WITH SALIVARY REDUCTASE ACTIVITY AND CAIRES ACTIVITY IN PRESCHOOL CHILDREN
Lee, Kwang-Hee ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 23, issue 4, 1996, Pages 925~930
The purpose of this study was to know whether the information of caries activity and caries experience of the children can be used to predict the behavior of the children during the dental treatment. The subjects of the study were one hundred and eighty-one preschool children, three to six years old. Salivary reductase activity was tested by the Resazurin Disc Test. Caries experience was examined. The children's behavior was observed using the rating scale of Frankl. Salivary reductase activity of the negative behavior group was slightly higher than that of the positive behavior goup, but the difference was not significant. dt index and ds index of the negative behavior group were significantly higher than those of the positive behavior group. There were no significant differences in ft index and fs index between the two behavior groups. The results suggest that the negative behavior of a child can be predicted when the child has many untreated dental caries.
EFFECT OF CALCIUM LACTATE ON DEMINERALIZATION OF SYNTHETIC HYDROXYAPATITE
Kim, Dae-Eop ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 23, issue 4, 1996, Pages 931~936
Many kinds of soluble calcium salts such as calcium lactate are known to reduce the enamel demineralization. In this study, calcium lactate was tested for its effect on the demineralization process of hydroxyapatite. Synthetic hydroxyapatites were used as a standardized material instead of human enamel which is rarely heterogenous. And, for the purpose of hydroxyapatite demineralization, lactic acid was used. By comparing the weight of hydroxyapatite pre-demineralization and post-demineralization, it was possible to examine the effect of calcium lactate on demineralization. The weight of demineralized hydroxyapatite was reduced by about 46% and 59% with 20mM and 40mM calcium lactate, respectively. In conclusion, low concentrations of calcium lactate showed an inhibitory effect on the demineralization of synthetic hydroxyapatite.
ADDITIONAL EFFECTS OF NITRUOS OXIDE TO OTHER SEDATIVE DRUGS FOR BEHAVIOR MANAGEMENT.
Jean, Young-Yim ; Yang, Kyu-Ho ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 23, issue 4, 1996, Pages 937~945
Nitrous oxide has acquired widespread use as a tool for management of anxious and comprehensive pediatric dental patients. Clinical impressions have suggested that inhalation sedation with
reinforces the effect of other sedatives. Fifteen uncooperative children, mean age of 37months, who were regarded as fail in the first treatment using chloral hydrate-hydroxyzine orally, midazolam orally or intranasally, were sedated with the same sedatives in conjunction with
. All the children were restrained in a pediwrap and were monitored with pulse oximeter for their heart rate and oxygen saturation. Degree of sleep, crying and movement were evaluated. The clinical results indicated that a satisfactory level of sedation was achieved in approximately two thirds of the cases (about 66 %) under those sedation manner. Complications were rare and those of treatments were successfully completed without difficulty.
AN EPIDEMIOLOGIC STUDY OF THE OCCLUSAL VARIATIONS FOR CHILDREN WITH DECIDUOUS DENTITION IN KWANGJU CITY
Yang, Kyu-Ho ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 23, issue 4, 1996, Pages 946~953
The occlusal patterns and profiles of the primary dentition were studied by oral examination from 3 to 6 year-old children (200 boys, 200 girls) in Kwangju city. The results were as follows; 1. In sagittal primary canine relationship, Class 1 pattern (74.75 %) was prevalent. 2. In sagittal primary molar relationship, Class 1 pattern (56 %) was prevalent. 3. In profile view, straight profile (77%) was prevalent. 4. In comparison of relationship between primary canine relationship, primary molar relationship and profile, Class 1 pattern-Class 1 pattern-Straight profile (43.14 %) was prevalent.
PHYSICAL MODIFICATION AND ABLATION THRESHOLDS OF DENTIN INDUCED BY ND : YAG, HO : YAG, AND ER : YAG LASERS
Lee, Sang-Ho ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 23, issue 4, 1996, Pages 954~967
Laser application to modify healthy permanent dentin to improve microhardness and caries resistence has been previously reported but the physical modification and ablation thresholds of carious and sclerotic dentin has yet to be identified. This study determined the energy density required by modify (physical modification threshold, PMT) and remove (ablation threshold, AT) infected carious, affected and selerotic dentin compared to healthy permanent dentin.
thick dentin sections(n=272) from extracted human teeth were used. Smear layer was removed 0.5M EDTA for 2 minutes. Utilizing three pulsed fiberopitc delivered contact lasers with different emission wavelengths(
=Nd : YAG,
=Ho : YAG and
: YAG). The energy density(
) was incrementally increased and the resulting tissue interaction classified on a scale from 0-6. A minimum of 5 repetitions/energy density were completed. Light microscopy(10-25X) was used to verify the physical modification(scale=3) and ablation thresholds(scale=4) of the various forms of dentin and the data were analyzed by logistic regression at the 95 % confidence interval. PMT and AT by the laser and the dentin types were: PMT and AT was lower in infected dentin than in sound dentin for all lasers. PMT and AT induced by Nd : YAG>Ho : YAG>Er : YAG for all forms of dentin. Microhardness was increased in sound dentin at PMT. Morphology of crater examined by light microscopy showed Nd : YAG was safe and effective for removing carious dentin and Er: YAG was effective for removing sound dentin. The PMT and AT for YAG lasers are different as a function of dentin type which may be utilized for selective modification and removal of dentin.
REPLANTATION OF TOOTH WITH INTRA-ALVEOLAR TRANSVERSE CROWN & ROOT FRACTURE
Hong, Soo-Jin ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 23, issue 4, 1996, Pages 968~974
Intra-alveolar transverse crown & root fx. provokes many problems in treatment. Conventionally, extraction of the injured tooth and its prosthodontic restoration has been the treatment of choice. Though orthodontic extrusion could be an alternative treatment, there would be a situation it's inadequate to apply. Loss of natural tooth would be a psychological damage to the patient, of course. This report describes a replantation method of tooth in case of intra-alveolar transverse crown & root fracture. The fractured tooth was extracted, rotated, then replanted. Fixation and esthetic restoration was done. And then endodontic treatment was followed. Continuing follow-up of its function and endodontic status is required.