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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 30, Issue 4 - Nov 2003
Volume 30, Issue 3 - Aug 2003
Volume 30, Issue 2 - May 2003
Volume 30, Issue 1 - Feb 2003
Selecting the target year
A STUDY ON THE MICROSCOPIC IMAGES OF DENTIN SURFACES IN PRIMARY TEETH ACCORDING TO SURFACE WETNESS AFTER ACID ETCHING
Oh, Young-Jun ; Jung, Tae-Sung ; Kim, Shin ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 30, issue 4, 2003, Pages 545~553
To achieve good dentin bonding, we must obtain proper wet dentin surface. The purpose of this study was to compare dentin surface according to different wetness degree by AFM image as studying how to obtaining proper wet dentin surface. Intact recently extracted primary teeth were used in the study. The extracted teeth were stored in distilled water at
until prepared. The teeth were used to prepare 1mm thick dentin disks with exposed surfaces parallel to the occlusal surfaces. The surface of the dentin were polished with polishing disk. The sample were ultrasonically cleaned with distilled water. The sample of each group were treated by different ways. We compared dentin surface of each group by AFM image. From the experiment, the following results were obtained. 1. Acid etching in the dentin surface of primary teeth, resulted in the removal of the smear layer, which opened dentinal tubules, caused the demineralization of peritubular and intertubular dentin, and exposed a collagen-rich transition zone. 2. If the etched dentin was so dehydrated, the intertubular dentin surfaces deceased in height and the diameters of the dentinal tubules decreased slightly. 3. In the group dried with compressed air for 20 seconds at 2 cm, the dentin surfaces were too excessive dried and dehydrated. 4. In the group dried with compressed air for 3 seconds at 2 cm, dry cotton, wet cotton, microbrush and absorbent tissue paper, the dentin surfaces were properly wet.
A STUDY ON THE CELL PROPERTY OF XYLITOL-RESISTANT STREPTOCOCCUS MUTANS AND XYLITOL-SENSITIVE STREPTOCOCCUS MUTANS
Lee, Hong-Mo ; Kim, Jung-Wook ; Jang, Ki-Taeg ; Lee, Sang-Hoon ; Hahn, Se-Hyun ; Kim, Chong-Chul ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 30, issue 4, 2003, Pages 554~562
Xylitol has been used as sugar substitute to prevent dental caries. It is not fermented by most dental plaque bacteria and interferes with the growth of mutans streptococci. Therefore the production of acidic metabolites and the growth of mutans streptococci are inhibited. S. mutans strains which are inhibited to grow under the presence of xylitol are referred as xylitol-sensitive (
) strains. However, experimental and clinical studies have shown that there were mutated groups of S. mutans strains that are not affected by xylitol. They are referred as xylitol-resistant(
) strains. The aim of the present study was to investigate that emergence of
strain would effect on the anticariogenecity of xylitol by comparing the growth rate, the extracellular pH, hydroxyapatite adhesion and the agglutination of the
strains. Overall we came out with following results : 1. No difference in the growth rate and the extracellular pH was found between the
strain and the
strain. 2. No difference in adhesion to hydroxyapatite surface was found between the
strain and the
strain (p>0.05) and adhesion of the
strain was greater than that of
strain in the sucrose-dependent adhesion to hydroxyapatite (p<0.05). 3. The
strain was agglutinated in the lower concentration of saliva than that of
CRANIOFACIAL MORPHOLOGIC CHARACTERISTICS OF PROFESSIONAL SPORTSMEN
Lim, Eun-Kyung ; Choi, Yeong-Chul ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 30, issue 4, 2003, Pages 563~575
The purpose of this study was to investigate differences in craniofacial characteristics of professional sportsmen who have practiced since their prepubertal periods. From the standardized lateral and P-A cephalograms of 137 sportsmen, 7 angular, 19 linear, 4 ratio, and 2 index measurements were measured and evaluated by means of statistical methods. The samples were divided into three groups: Group 1; ice hockey(n=17), foot-ball(n=27), basketball(n=16) Group 2; baseball(n=16), gymnastics(n=13), and Group 3; judo(n=18), ssireum(n=10), weight lift(n=20). The results were as follows: It seemed obvious that the cephalic indices of the 3 groups exhibited brachycephalic headform (Group 1;
, Group 2;
, Group 3;
) and there was no statistical difference among the groups (p>0.05). The facial indices of the Group 1 (
) and Group 2 (
) exhibited definite leptoprosopic facial forms while the Group 3 (
) showed more or less euryprosopic facial form, and there appeared significant difference between the Group 1 and 3 (p<0.05), and also between the Group 2 and 3 (p<0.05). There appeared strong relationships between the facial indices and the facial axis angle, mandibular plane angle, total craniofacial height, total facial height, upper anterior dental height, lower anterior dental height, mandibular length, lower anterior facial height ratio, and especially with lower anterior facial height (p<0.001). It seemed that most of the vertical facial measurements of the Group 1 and 2 appeared to be larger than those of the Group 3.
TRAUMATIC ROOT FRACTURE IN YOUNG PERMANENT TEETH : A CASE REPORT
Kang, Sun-Hee ; Kim, Dae-Eop ; Lee, Kwang-Hee ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 30, issue 4, 2003, Pages 576~580
A 7-year-old male was refered to Department of Pediatric Dentistry, Wonkwang Dental Hospital for treatment of a traumatic injury to the teeth of the maxillary anterior region of the mouth. His right central incisor presented subluxation and root fracture, the left central incisor had suffered intrusive luxation and root fracture. The initial treatment involved reposition and fixation of the teeth with 0.5mm stainless steel wire and composite resin. The patient was submitted for clinical and radiographic fallow-up. After 4 years, radiographically the right central incisor seemed to be healed by hard tissue union and showed to be indistinct fracture line, intact lamina dura. The left central incisor radiographically was healed by interposition of bone and connective tissue and showed to be distinct horizontal fracture line separating the fragments, and pulp canal obliteration. In clinical examination, the teeth showed a normal response to elective pulp test, percussion and mobility test. Pulp survival after injuries appears to be dependent upon the type of luxation injury, age of patient, stage of root development and degree of dislocation. In this case, the two teeth with incomplete root formation were suffered different type of injury by trauma and has showed different healing aspect.
A STUDY OF THE EFFECT OF CHEMO-MECHANICAL CARIES REMOVAL SYSTEM ON THE REMOVAL OF CARIOUS DENTIN AND RESIN ADHESION TO DENTIN
Kang, Dug-Il ; Park, In-Chon ; Lee, Nan-Young ; Lee, Sang-Ho ; Lee, Chang-Seop ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 30, issue 4, 2003, Pages 581~592
The aim of this study was to evaluate the effect of chemo-mechanical caries removal system(
, Medi Team, Sweden) for resin adhesion to carious primary and permanent dentin compared with conventional drilling method. The buccal surface of 92 primary molars and 92 permanent molars were used. Exposed dentins were occurred artificial caries. 32 tooth of primary molars and 32 tooth of permanent molars were prepared to observe treated dentin surface with
and conventional drilling method by SEM. Other tooth were prepared to measure resin-dentin shear bonding strength according to caries removal methods and dentin adhesive system. Two adhesive systems and a composite resin were used; single bonding agent(Scotchbond Multi-Purpose Plus, 3M) and self-etching bonding system(Prompt L-pop, 3M ESPE), and a composite resin (Z-250, 3M). The results were as follows : 1. The removal effect of carious dentin on
was stronger on the primary dentin than that to permanent dentin, and dentin surface became rougher with treated
than drilling method. 2. Acid-etched dentin surfaces were showed smoothening without smear layer. 3. In specimen applied single bonding system hybrid layer and adhesive layer were
in thickness, whereas self-etching bonding system were showed only thin hybrid layer(
). 4. The shear bonding strength of group applied single bonding agent was higher than that applied self-etching priming system(P<0.05). 5. The shear bonding strength of group applied
and self-etching priming system were slightly higher than that applied conventional drilling method and self-etching priming system(P>0.05).
AN IN VITRO STUDY OF MICROLEAKAGE OF COMPOSITE RESINS
Lee, Sun-Young ; Yang, Yeon-Mi ; Baik, Byeong-Ju ; Jeon, Cheol-Wan ; Kim, Jae-Gon ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 30, issue 4, 2003, Pages 593~599
The purposes of this study were to evaluate the microleakage of class V composite resin restorations utilizing the different curing lights, to assess the flowable resin,
(3M Dental Products, USA) and composite resin,
(3M Dental Products, USA) which need 20s curing time for halogen light could replace
Restorative(3M Dental Products, USA) for the microleakage, and to evaluate the effect of adhesive resin on marginal microleakage. Light curing units used in this study were conventional halogen light, XL3000(3M Dental Products, USA) and plasma arc light, Flipo(Lokki, France). Class V cavities were prepared and each cavity was filled with each composite resin. After being filled, the teeth were stored in distilled water, polished, thermocycled and soaked in 1% methylene blue solution. Following results were obtained from evaluation of the sectioned surface. 1. There was no statistically significant difference in microleakage of
between two kinds of curing units(p>0.05). 2. Flowable resin,
showed more microleakage than Z100 and
regardless of curing units(p<0.05). 3. Adhesive resin reduced the microleakage of composite resin in both halogen light and plasma arc light(p<0.05).
ORTHODONTIC TRACTION OF HORIZONTALLY IMPACTED MAXILLARY CANINE
Choi, Hyung-Jun ; Lee, Jong-Eun ; Lee, Jae-Ho ; Lee, Jong-Gap ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 30, issue 4, 2003, Pages 600~604
Tooth impaction is defined as a cessation of the eruption of a tooth at the level of the oral mucosa or alveolar bone. Maxillary canines are the most frequently impacted teeth next to the third molar. Maxillary canine impaction is associated with congenital missing of lateral incisors, peg lateralis and genetic factors such as ectopic positioning of a tooth germ. The clinicians have an important role in early detection of tooth impaction for prevention of esthetic and functional problems. There are specific methods to treat impacted tooth for different conditions. In this case, an 11-year-old girl with a horizontally impacted maxillary right canine in a palatal position was treated through orthodontic traction along with surgical button attachment procedure. On regaining of eruption space, canine traction was performed. At the completion of treatment, the canine was positioned fairly within the arch with proper keratinized gingiva and complications such as root resorption were not observed.
PATHOLOGIC ROOT RESORPTION OF PRIMARY CENTRAL INCISORS
Choi, Byung-Jai ; Chung, Chu-Hyun ; Choi, Hyung-Joon ; Sohn, Heung-Kyu ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 30, issue 4, 2003, Pages 605~610
Physiologic root resorption occur from the apex of the primary teeth close to the permanent teeth towards the apex. Pathologic root resorption occur on surfaces of root due to causes such as trauma, replantation, orthodontic treatment, delayed or irregular eruption of teeth, or growing cysts or tumors. In children, the most frequently affected teeth from trauma are the maxillary primary central incisors. After such an event, root resorption initiate from the traumatized pulp or periodontium. In this case report, periapical radiographs were used to evaluate the features of pathologic root resorption by studying patients with history of trauma. The following results were noted. 1. Pathologic root resorption was observed in various patterns in all of the 10 traumatized maxillary primary central incisors. 2. Though teeth with pathologic root resorption were treated with pulpectomy, the resorption process continued to progress.
IMPACTED MANDIBULAR CANINES; CASE REPORT
Baik, Byeong-Ju ; Seo, Jeong-Ah ; Park, Jong-Ha ; Yang, Yeon-Mi ; Kim, Jae-Gon ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 30, issue 4, 2003, Pages 611~617
Impacted mandibular canines are less common than impacted maxillary canines. The proceeding studies show that impacted mandibular canines occur in approximately 0.1% of patients examined. The causes of impacted mandibular canines are inadequate space, premature loss of the primary dentition, excessive crown length, hereditary factors, functional disturbances of endocrine glands, tumors, and traumas. The basic choices for treatment of those cases are orthodontic migration or surgical removal. This is a case report about those two different treatment methods. One patient was 11 years old female who had treated with surgical approach and the other was 14 years old male who had received orthodontic treatment.
A STUDY OF THE TRAUMATIC INJURIES IN THE PRIMARY DENTITION
Choi, Sung-Chul ; Park, Jae-Hong ; Lee, Keung-Ho ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 30, issue 4, 2003, Pages 618~625
The purpose of this study was to analyze the traumatized primary teeth and investigate the occurrence, types, area, cause, place of trauma to primary teeth and seasonal variation in a hospital population, and to evaluate the interval between injury and treatment. A total 411 children with 745 traumatized teeth participated in this study from 1998 to 2000. The results were as follows : 1. There were slightly more boys than girls giving a male-to-girl ratio of 1.74:1.0. The 1-2, 2-3 year old boys and girls had the highest number of traumatic injuries to their primary dentition. 2. The most common injury was concussion. 3. The majority of traumatized teeth are the upper primary central incisors. 4. Falling down was the most common cause of injury in both sexes. The most of the injuries occurred inside home. 5. 46% of the children visited the dental office within 24 hours after traumatic injury. 6. The most common month was October(12.7%), and June(12.2%), May(11.7%) were followed.
INHIBITION OF BIOFILM FORMATION BY PEDIOCOCCUS PENTOSACEUS K1270 ISOLATED FROM KIMCHI
Choi, Woi-Im ; Han, Su-Ji ; Kim, Shin ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 30, issue 4, 2003, Pages 626~636
Pediococcus pentosaceus K1270 was isolated from naturally fermented kimchi and identified based on the 16S rDNA sequence as well as cultural and biochemical characteristics. This strain strongly inhibited the formation of biofilm by Streptococcus mutans Ingbritt. K1270 also showed antibacterial activity against S. mutans Ingbritt. It was observed that K1270 strain produced hydrogen peroxide on MRS agar supplemented with 3, 3, 5, 5-tetramethylbenzidine (TMB) and peroxidase and the inhibitory effect of K1270 strain on the biofilm formation was reversed by the addition of catalase in part. Culture supernatant of K1270 inhibited the biofilm formation and the multiplication of S. mutans Ingbritt. This inhibitory effect of culture supernatant was decreased slightly by the addition of catalase and abolished by heat or trypsin treatment. Thus, this study suggests that P. pentosaceus K1270 inhibit the biofilm formation through the inhibition of the replication of S. mutans Ingbritt by producing hydrogen peroxide and bacteriocin.
THE RADIOGRAPHICAL MEASUREMENT OF ROOT CANAL CURVATURE OF MANDIBULAR PRIMARY 2ND MOLARS
Kim, Young-Jong ; Jeong, Tae-Sung ; Kim, Shin ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 30, issue 4, 2003, Pages 637~642
Morphology of primary root divergency and curvature determines the pattern of root resorption and periapical lesion, and affects successful root canal treatment. With the purpose of analysing the morphology of primary mandibular second molar roots and canals, the frequency, angle, radius, and start of curvature of the canal were measured. Fifty clinical radiographs were taken from
years old children, followed by digitizing after scanning and analyzing by Scion image Beta 4.02TM(Scion Co. USA). The angle of curvature was determined by Schneider's method and the radius of curvature was determined by Schaefer's method. The results were as follows: 1. The angle of curvatures were
(distal). Distal curvature was significantly larger than mesial.(p<0.05) 2. The radius of curvatures were
(distal). Mesial curvature was significantly larger than distal.(p<0.05) 3. The start of curvatures were
(distal). There were no difference between two groups. (P<0.05)
THE EFFECT OF FIBROBLAST GROWTH FACTOR SIGNALING ON CARTILAGE FORMATION
Park, Choong-Je ; Lee, Sang-Won ; Nam, Soon-Hyun ; Kim, Young-Jin ; Ryoo, Hyhn-Mo ; Kim, Hyun-Jung ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 30, issue 4, 2003, Pages 643~653
Fibroblast growth factor (FGF) / FGF receptor (FGFR) mediated signaling is required for skeletogenesis in cluding intramembranous and endochondral ossifications Runx2 (
) is an essential transcription factor for osteoblast differentiation and bone formation. Murine calvaria and mandible are concurrently undergoing both intramembranous bone and cartilage formations in the early developmental stage. However the mechanism by which these cartilage formations are regulated remains unclear. To elucidate the effect of FGF signaling on development of cranial sutural cartilage and Meckel's cartilage and to understand the role of Runx2 in these process, we have done both in vivo and in vitro experiments. Alcian blue staining showed that cartilage formation in sagittal suture begins from embryonic stage 16 (E16), Meckel's cartilage formation in mandible from E12. We analyzed by in situ hybridization the characteristics of cartilage cells that type II collagen, not type X collagen, was expressed in sagittal sutural cartilage and Meckel's cartilage. In addition, Runx2 was not expressed in Meckel's cartilage as well as sagittal sutural cartilage, except specific expression pattern only surrounding both cartilages. FGF signaling pathway was further examined in vitro. Beads soaked in FGF2 placed on the sagittal suture and mandible inhibited both sutural and Meckel's cartilage formations. We next examined whether Runx2 gene lies in FGF siganling pathway during regulation of cartilage formation. Beads soaked in FGF2 on sagittal suture induced Runx2 gene expression. These results suggest that FGF signaling inhibits formations of sagittal sutural and Meckel's cartilages, also propose that FGF siganling is involved in the proliferation and differentiation of chondroblasts through regulating the transcription factor Runx2.
TREATMENT OF THE INTRUDED PERMANENT INCISORS : SURGICAL REPOSITION AND ORTHODONTIC TRACTION
Shin, Ji-Sun ; Kim, Jong-Soo ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 30, issue 4, 2003, Pages 654~659
Intrusive luxation that takes approximately three percent of permanent teeth commonly occures at anterior teeth. This intrusion frequently leads to pulp necrosis, root resorption, marginal bone loss and these complications are influenced by depth of intrusion and stage of root development. Various treatment approaches have been suggested to manage of intrusive luxation. Techniques aiming to reposition the intruded tooth include an observation for spontaneous re-eruption, surgical or orthodontic repositioning. We report two cases with clinically satisfactory results for traumatically intruded maxillary central incisor. In one case which has a large open apex and mild intrusion depth, we observed for spontaneous eruption and then repositioning by forced eruption method. In other case, which has been completely intruded, was repositioned by surgical extrusion and followed by apexification.
INHIBITORY EFFECTS OF ER:YAG LASER ON THE GROWTH AND ACID PRODUCING ABILITY OF STREPTOCOCCUS MUTANS
Kim, Hee-Jin ; Kook, Joong-Ki ; Lee, Sang-Ho ; Lee, Nan-Young ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 30, issue 4, 2003, Pages 660~666
The purpose of this study was to investigate the inhibitory effect of Er:YAG laser against the intraoral acid producing bacterium of S. mutans. Bacterial pellet containing S. mutans KCTC 3065 was irradiated by Er:YAG laser having a
diameter beam by non-contact mode. Irradiated parameters were 50mJ, 10Hz and exposure time were 1s, 3s, 5s, 7s, 9s respectively. We obtained the following results of relative growth rate and acid-producing ability of S. mutans by culturing for 48hrs. 1. The growth rate of S. mutans was decreased in the group of laser irradiation compared to the control group(P<0.01). 2. The growth rate at laser irradiation group of 7s, 9s irradiation time was decreased significantly compared to the laser irradiation group of 1s, 3s, 5s irradiation time, until 12 hours(P<0.05). After 24 hours, all groups of laser irradiation were not found to be statistically different in each other. 3. The acid-producing ability of S. mutans was inhibited for a certain duration by irradiation of laser. In summary, the growth rate and acid producing ability of S. mutans decreased according to laser irradiation. This effect was directly related to the amount of irradiation time. These results suggested that Er:YAG laser had an growth inhibition effect on S. mutans.
RIEGER SYNDROME : A CASE REPORT
Lee, Hong-Mo ; Kim, Jung-Wook ; Jang, Ki-Taeg ; Lee, Sang-Hoon ; Hahn, Se-Hyun ; Kim, Chong-Chul ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 30, issue 4, 2003, Pages 667~672
Rieger syndrome is a rare, autosomal dominant genetic disorder characterized by malformation of the anterior chamber of the eye(goniodysgenesis) coincident with hypodontia. It may also be accompanied by a spectrum of dental, craniofacial and somatic anomalies. Mutations in paired-like homeodomain transcription factor2(PITX2) are associated with the syndrome, and its frequency in the general population has been estimated to be 1 : 200,000. In the present case, the patient, 4 year 7 month-old female, had posterior embryotoxon and polycoria. The maxilla was retrusive in cephalometric radiography. She had congenital missing on #52, #62 and some tooth germs of permanent tooth were not detected in panoramic radiography. The purpose of this paper is to report the dental and craniofacial findings and review the pertinent literature through this case.
MANDIBULAR EXPANSION IN A CONGENITAL AGLOSSIA PATIENT
Cho, Jae-Yong ; Kim, Jung-Wook ; Jang, Ki-Taeg ; Kim, Chong-Chul ; Hahn, Se-Hyun ; Lee, Sang-Hoon ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 30, issue 4, 2003, Pages 673~677
Congenital aglossia is a very rare condition. The oral manifestations of an aglossia include micrognathia, high arched or cleft palate, defects of the lower lip, an absence of lateral incisors and a mandibular growth deficiency. Although the etiology of congenital aglossia is unclear, both genetic and teratogenic mechanisms have been proposed. Treatment of aglossia patients depends on the nature and severity of the condition which includes surgical rehabilitation of the tongue tip to some extent, orthopedic expansion of the mandible to guide mandibular growth, and mandibular expansion by a distraction osteogenesis. In the present case, a 6 year old female aglossia patient with situs inversus was treated. A bonded hyrax screw was used to increase her mandibular primary intercanine width and intermolar width. A second phase orthodontic and surgical treatment will be possible after some retention phase.
PREVALENCE AND RISK FACTORS OF SEVERE EARLY CHILDHOOD CARIES IN PRESCHOOL CHILDREN IN IKSAN CITY
Lee, Kwang-Hee ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 30, issue 4, 2003, Pages 678~683
Preschool children in Iksan city, 3-5 years old, were examined for their prevalence of severe early childhood caries. The case definition was 1 or more cavitated, filled, or missing (due to caries) smooth surfaces in primary maxillary anterior teeth. Feeding behavior and oral hygiene behavior were investigated by a questionnaire. The prevalence was 20.8% for 36-47 months, 23.6% for 48-59 months, and 30.8% for 60-71 months. Going to sleep with bottle beyond 1 year (P<0.05), immediate removal of bottle after child fell on sleep (P<0.01), beginning time of toothbrushing (P<0.01) had significant relationship with the prevalence of severe early childhood caries. Toothbrushing frequency of primary care provider and use of oral cleaning aids by primary care provider had a tendency to be related with the prevalence(P<0.10).
EFFECT OF UNREACTED RESIN MONOMES ON THE ATIVITY OF CARIOGENIC BACTERIA
Park, Seung-Kyu ; Kim, Hwa-Sook ; You, So-Young ; Han, Jin-Ju ; Kook, Joong-Ki ; Lee, Nan-Young ; Lee, Sang-Ho ; Lee, Chang-Seop ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 30, issue 4, 2003, Pages 684~695
The aim of this study was to investigate the effect of composite resin components on proliferation and glucan synthesis by cariogenic bacteria, Streptococcus mutans and Streptococcus sobrinus. Light curing pit and fissure sealant was chosen for evluation. Specimens were eluted in deionized water for 10 minutes, 1, 12, and 24 hours. Extracts of specimens were diluted into 1/2, 1/4, and 1/8 with addition of BHI broth and BHI-YS. Bacteria were cultured in media included eluted components, and measured optical density(
). The following results were obtained 1. 1/4 concentration of elutes for 10 minutes significantly inhibited the proliferation of S. mutans, whereas 1/2, 1/8 concentration of elutes stimulated it. Also, exacts, especially 1/2, 1/4 concentration, for 1 hours stimulated it. But exacts for 12, 24 hours had not effects on the proliferation of S. mutans. 2. 1/4 concentration of elutes for 10 minutes inhibited growth of S. sobrinus, whereas extracts for 1, 12, 24 hours had not effects on the proliferation of S. sobrinuss. 3. Extracts from composite resin stimulated total growth of S. mutans more than growth control group, where as inhibited it of S. sobrinus. 4. Extracts from composite resin, especially 1/4 concentration of it for 10 minutes increased the formation of water insoluble glucan of S. mutans. But elutes for 1, 12, 24 hours, and 1/8 concentration of it for 10 minutes inhibited it. 5. Except 1/4 concentration of elutes for 10 minutes, extracts decreased the formation of water insoluble glucan of S. sobrinus. 6. Total amount of formated glucan was 3-fold higher in S. mutans than in S. sobrinus.
A STUDY ON THE VOLUMES AND FORMS OF THE PALATE FOR DECIDUOUS AND PERMANENT DENTITION
Yang, Yeon-Mi ; Baik, Byeong-Ju ; Kim, Jae-Gon ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 30, issue 4, 2003, Pages 696~706
The purpose of this study was to clarify the palatal forms through palatal curvatures of right to left, anterior to posterior direction, and difference of right and left palatal volumes in the primary and permanent dentition. Samples were consisted of normal occlusion of both dentition(50 males and 50 females each). Their upper plaster casts were used, measuring points were decided, through 3-dimensional laser scanning(3-D Laser Scanner, DS4060, LDI, U.S.A.), and fitting standard horizontal plane were made for measuring the height and sectioned volumes of palate. The results were as follows: 1. Palatal volume and height were greater at the right side of the palate in the primary and permanent dentition of male and female, but there was no significance. 2. Palatal height was greater in male compared to female, especially, there was significant difference at intercuspid, inter-second premolar area in the permanent dentition(P<0.05). 3. To the height of A-P direction of mid-palatal area, the highest point was 20mm in the primary dentition, 30mm in the permanent dentition from interdental papilla of central incisors. 4. Palatal height of inter-cuspid and inter-second premolar became shallow and broad, high and broad each, compared to inter-deciduous canine and inter-second deciduous molar.
TEMPERATURE TRANSMISSION OF PAC UNIT THROUGH DENTIN
Park, Ho-Won ; Kim, Ji-Hun ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 30, issue 4, 2003, Pages 707~714
Plasma Arc Curing(PAC) units operate at relatively high intensity and claimed to result in optimum properties of composite resin in a short curing time, so the interest of pediatric dentists about PAC units have been increased recently. But PAC units used for polymerizing restorative resins produce heat during operation. The purpose of this study was to evaluate temperature transmission through dentin of various depths using two types of PAC units(Flipo, Q-Lux plasma 100). The results from the present study can be summarized as follows : 1. When PAC be used continuously, temperature on tip was increased as curing times, and Q-Lux showed greater temperature rising(p<0.001). 2. Compared temperature transmission as dentin depth, temperature rising rate was decreased as dentin thickened(0.5, 1.0, 1.5, 2.0mm)(p<0.05). 3. Compared temperature transmission as resin depth, temperature rising rate was also decreased as resin thickened(1.0, 2.0mm)(p<0.05).
RESTORATION OF A FRACTURED CENTRAL INCISOR USING TOOTH FRAGMENT : CASE REPORT
Choi, Eun-Young ; Choi, Nam-Ki ; Yang, Kyu-Ho ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 30, issue 4, 2003, Pages 715~721
Dental injuries with crown fracture occur frequently, especially in young patient Reattachment of the crown fragment has been shown to yield good esthetic results in that original tooth anatomy is restored with a material that abrades at a rate indntical to that of the adjacent tooth substance and at the same time permits continual monitoring of pulpal status through the fragment. Case 1 was complicated crown fracture with pin-point bleed ing, that was treated by direct pulp capping with calcium hydroxide and fragment reattachment. Case 2 was in trusive luxation with complicated crown fracture and was treated by pulp treatment and fragment reattachment. Case 3 was uncomplicated crown fracture, and fracture line involved slightly biologic width and treated by reattachment of the crown fragment.
THE EFFECT OF XYLITOL AND CARBOHYDRATES ON THE REPLICATION OF STREPTOCOCCUS ORALS AND STREPTOCOCCUS SALIVARIUS
Yang, Kyu-Ho ; Han, Su-Ji ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 30, issue 4, 2003, Pages 722~727
Xylitol is a 5-carbons carbohydrate, which can be replaced with sucrose for preventing caries. The effect of carbohydrates and their combinations with xylitol was studied for the replication of oral bacteria such as Streptococcus oralis and Streptococcus salivarius. The replication of Streptococcus oralis and Streptococcus salivarius was inhibited according to the increased concentration of xylitol. When Streptococcus oralis was incubated for 8 hours in the media added with lactose or sucrose, the optical density was 0.915 and 1.107, repectively. while being 0.127 and 0.104, respectively in the media combined with xylitol. When Streptococcus salivarius was incubated for 8 hours in the media added with lactose or fructose, the optical density was 1.550 and 0.420, repectively. while being 0.271 and 0.905, respectively in the media combined with xylitol. These results indicated that the replication of Streptococcus oralis and Streptococcus salivarius was changed according to kinds of carbohydrates and combined addition of xylitol.
CARIES-RELATED MICROBIOLOGICAL SCREENING IN CHILDREN UNDER THREE YEARS OF AGE
Park, Jae-Hong ; Lee, Keung-Ho ;
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY, volume 30, issue 4, 2003, Pages 728~737
To evaluate microbial data and salivary measurements from clinically compatible, culture-based screening procedures employed with children younger than 36 months old. Plaque and stimulated saliva specimens were collected from 87 children. The pH of each saliva sample was measured before and after 0.94% lactic acid was added. Specimens were diluted and plated on selective media and non-selective media. Data collected were counts of mutans streptococci (MS) and lactobacilli (LB). In addition, total viable counts (TVC) of specimens, salivary pH and buffering capacity were also assessed. Each variable was compared to caries status of subjects. According to this study, the results were as followed: 1. Highly significant correlation with caries rates were found for counts of MS and LB. 2. The specific counts/ml saliva or plaque above which caries is predicted, or below which caries is not predicted were as follows: 1) Saliva MS;
2) Plaque MS;
3) Saliva LB;
4) Plaque LB;
. 3. Salivary pH and buffering capacity versus caries status were not significant. 4. Microbial screening methods based on mutans streptococci had higher predictive values and odds ratios than methods for lactobacilli. 5. MS counts were clearly the best indicators of caries status in young children. This measurement can easily be obtained in a dental clinical setting both by conventional culture techniques, or commercial kits for MS recovery.