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2013, Vol.40, No.4

  • 1.

    Enhancement of Erythrosine Photodynamic Therapy against Streptococcus mutans by Chlorhexidine

    박종철 | Howon Park | Siyoung Lee | 2013, 40(4) | pp.241~246 | number of Cited : 3
    Abstract PDF
    The purpose of this study was to investigate the synergistic effects of erythrosine sensitized with a conventional halogen curing unit and sub-minimal bactericidal concentration(sub-MBC) of chorhexidine on bacterial viability of Streptococcus mutans in planktonic state. Sub-minimal bactericidal concentration of chlorhexidine was added into wells containing bacteria and erythrosine. The range of concentrations tested for chorhexidine was from 0.0000001% to 0.001%. The irradiation of the bacterial suspensions was performed for 15 sec with a conventional halogen curing unit light. In another set of experiment, the effects of 0.001% chlorhexidine were observed by adding chlorhexidine into wells containing the sub-minimal bactericidal concentration of erythrosine. At the concetration of 0.001% chlorhexidine, there were no antibacterial effects in the absence of erythrosine PDT(p < 0.05). At the concentraton of 1 μM erythrosine, there was no photodynamic therapy effect in the absence of chlorhexidine(p < 0.05). But in the presence of sub-minimal bactericidal concentration of erythrosine with light exposure, the addition of 0.001% chlorhexidine increased the bactericidal rate(p < 0.05). A combination of erythrosine PDT with sub-MBC chlorhexidine resulted in a significant reduction in bacterial counts when compared to the case with the absence of chlorhexidine.
  • 2.

    Microleakage and Anticariogenic Effect of S-PRG Filler-containing Pit and Fissure Sealant

    신승우 | Jong-Soo Kim | 2013, 40(4) | pp.247~252 | number of Cited : 2
    Abstract PDF
    Pit and fissure sealant prevents biofilm accumulation, plays a role in forming a barrier to acidic substance made by the bacteria. The Surface reaction-type pre-reacted glass ionomerI(S-PRG) filler was developed in 1999. S-PRG filler releases fluoride continuously and does not decompose under wet conditions. The aim of this study was to test the microleakage and anticariogenic effect to adjacent enamel of S-PRG filler-containing pit and fissure sealant. Sound premolars and molars were used in this study. A S-PRG filler-containing pit and fissure sealant,Beautisealant􀋓(Shofu, Japan) was used for this experiment, the composite resin sealant Concise􀋓(3M ESPE,USA) was used as control. For the microleakage test, all teeth surface were double coated with finger nail varnish,with the exception of a 1.0 mm window around the restoration margins. The teeth were immersed in 2%methylene blue solution for 24 hours and then rinsed in tap water. For the anticariogenic effect evaluation, all tooth were immersed in artificial carious solution for 9 days and rinsed with tap water. Each tooth was embedded in orthodontic acrylic rein and subsequently sectioned longitudinally in a bucco-lingual direction with a lowspeed diamond saw. The cut sections were examined using a stereomicroscope. Differences in microleakage between the two groups were not different significantly. But the S-PRG filler-containing pit and fissure sealant showed higher anticariogenic effect than that of flowable resin sealant.
  • 3.

    Evaluating Course of Pediatric Dentistry on Correlation Analysis between Dental Students' Achievements of Subjects and OSCE

    BANG, JAE-BEUM | 임재영 | 박재홍 | 2013, 40(4) | pp.253~259 | number of Cited : 0
    Abstract PDF
    This study aimed to evaluate the courses of pediatric dentistry based on correlation analysis between scores of objective structured clinical examination (OSCE) and related subjects for 79 fourth-year students. The score of theory were related to preclinical (r = 0.449, p = 0.000) and clerkship (r = 0.437, p = 0.000) each, but the scores of clerkship were not related to OSCE. To make the students skillful for clerkship, more professor’s firsthand teaching on treating patients and adequate numbers of clinical professors are required. Patients who come to the university dental hospital prefer to be treated by professors rather than students. In these circumstances, educational conditions should be arranged by ensuring the number of professors for teaching students to improve their clinical competence through direct instruction and feedback to students. In addition,pragmatic improvement plans, which allow continuous education and evaluation about basic techniques to be examined in the clinical practice course, should be compromised with the more concrete evaluation of the curriculum in order to evaluate theoretical knowledge and technical trainings to be well exercised and deepened in the practical clinical field.
  • 4.

    Three Dimensional Analysis of Maxillary Mesiodens Using Dental CBCT and Relationship Between the Mesiodens and Diastema

    강은주 | Choi Nam-Ki | kim seonmi | 2013, 40(4) | pp.260~267 | number of Cited : 1
    Abstract PDF
    The aim of this study was to analyze the three dimensional characteristics of the size, shape and location of mesiodens and their effect on permanent teeth arrangement using Cone-beam computed tomography(CBCT). 191 patients under 15 years old who had visited the hospital between June 2006 and December 2012 and taken CBCT were investigated. Among them, 43 patients with diastema were analyzed to investigate the correlation between the amount of diastema and the mesiodens. The results showed that mesiodens were found in males 3.9 times more than females and found most in 7years old. The mean length of mesiodens was 13 mm and the width was 6.8 mm. The conical shape comprised of 52.9%. Many mesiodens were located in the palatal side rather than the labial side and located vertically near the crown. 63.0% of mesiodens were reversed and the common complications were delayed eruption followed by diastema, and teeth rotation. And the amount of diastema had correlation with size and mesiodistal position of the mesiodens. The current study used 3D analysis to show the size and position of mesiodens and occurrence distribution of complication. Among these, the amount of diastema had shown the correlation with the size and mesiodistal position of mesiodens.
  • 5.

    The Effectiveness of Clinical Sterilization Methods in Dental Air/water Syringes

    Seyoung Shin | Yang Yeon Mi | 김미아 and 2other persons | 2013, 40(4) | pp.268~273 | number of Cited : 1
    Abstract PDF
    This study aims to investigate contamination level and effective clinical disinfection methods of dental air/water syringes (AWS) by using microbial incubation. This study used AWS of ten dental unit chairs of Hospital. Total 180 samples were obtained. There are six groups of samples: non-sterilized (group 1), sanitized with wet-gauze (group 2), sanitized with 78% ethanol sponge for 10 seconds (group 3), sanitized with 78% ethanol sponge for 20 seconds (group 4), sanitized with 1 : 100 diluted High Level Disinfectant􀋓 (group 5), autoclaved (group 6). Group 1 and 2 showed statistically significant level of CFUs than Group 4, 5 and 6 (p < 0.05). Group 4, 5 and 6 did not show any noticeable CFU. Sanitizing AWS tips with ethanol and High level disinfectant􀋓 proves to be a useful and practical method for preventing cross-infections.
  • 6.

    Prevalence and Distribution of Congenitally Missing Teeth in Patients Visiting the Department of Pediatric Dentistry of Chonbuk National University Hospital

    전현순 | Yang Yeon Mi | Byeong Ju Baik and 1other persons | 2013, 40(4) | pp.274~282 | number of Cited : 3
    Abstract PDF
    The goal of this study was to analyze prevalence and distribution of congenitally missing teeth in 3302patients from 7 to 15 years old, who had visited and taken panoramic radiographs at the Department of Pediatric Dentistry, from January 2008 to December 2012. The prevalence of hypodontia in the males (5.9%) was slightly higher than in the females (4.7%). In the affected patients, the mean number of congenitally missing teeth in the mandible was statistically higher than in the maxilla (p < 0.05). However, there was no significant difference in the number of congenitally missing teeth between left and right dentitions (p > 0.05). Excluding the Mn. third molars, the most frequent congenitally missing teeth site was the Mn. second premolars. In contrast, the most infrequent congenitally missing teeth sites were the Mx. and Mn. first premolars, and Mx. central incisors. The bilateral combination or antagonistic quadrants combination of congenitally missing teeth in hypodontia patients was 80.3%. The result of this study will contribute to clinicians to make accurate diagnosis and establish favorable treatment plans, by offering invaluable data about the number and distribution of congenitally missing teeth.
  • 7.

    The Effect of Aging Treatment for Microleakage within Composite Resin Restoration

    Seunghoon Yoo | 2013, 40(4) | pp.283~295 | number of Cited : 1
    Abstract PDF
    In this study, researchers tried to find the effect, if any, of aging treatment to the specimens with three different dentin bonding agents using MicroCT. One, 5th generation - [AdperTM Single bond Plus] and two 6th generation [AdheSE􀋓, AdperTM PromptTM L-PopTM] dentin bonding agents were used in this study. Specimens were divided into 4 groups according to aging treatment method used. Group I : control group,Group II : thermocycled between 5℃ and 55℃ for 60 seconds dwell time 5,000 times, Group III : aged as Group II and artificially brushed 20,000 times, Group IV : aged as Group III and were stored in artificial saliva for 6months. With Single bond Plus, Group II showed more microleakage than Group I (p < 0.05). Group II and Group III showed more microleakage than Group IV (p < 0.05). There were no statistically significant differences among the groups using AdheSE􀋓 and PromptTM L-PopTM (p > 0.05). Among Group I, AdheSE􀋓 showed more microleakage than Single bond Plus and PromptTM L-PopTM (p < 0.05). Among Group II, there were no statistically significant differences (p > 0.05). Among Group III, AdheSE􀋓 showed more microleakage than Single bond Plus and PromptTM L-PopTM (p < 0.05). Among Group IV, AdheSE􀋓 and PromptTM L-PopTM showed more microleakage than Single bond Plus (p < 0.05).
  • 8.

    The Prevalence of Malocclusion and Related Self-Esteem of Adolescents in Yangsan

    류현정 | 김형준 | JEONG,TAE-SUNG and 2other persons | 2013, 40(4) | pp.296~305 | number of Cited : 0
    Abstract PDF
    For the purpose of evaluating the prevalence of malocclusion and self-esteem in adolescents, 1,380 middleschool students in the Yangsan area were surveyed by oral examination and questionnaires and the obtained results were as follows:The distribution of 1st molar occlusion by Angle’s classification was 69.0, 19.4, 10.6% for Class I, II and III respectively. In the horizontal relationship, the prevalence of normal overjet and crossbite was 86.9% and 5.6%respectively whereas larger and extremely larger overjet was found in 6.6% and 0.8%. In the vertical relationship of anterior teeth, normal, deep overbite and openbite was shown in 94.1%, 4.7%, and 1.2%. For the midline discrepancy, the distribution of groups with 0~1 mm, 2~4 mm and over 5 mm was 98.2%, 1.4%, and 0.4%. Crowding only in the maxilla was found in 9.6%, while that only in the mandible and in both arches was 14.1%and 24.1% respectively. Spacing only in the maxilla was seen in 3.0%, while that only in the mandible and in both arches was 2.4% and 1.7% respectively. Significant difference in self-esteem was revealed in female and malocclusion groups of crossbite and openbite(p < 0.05).
  • 9.

    Improvement of Articulation Disorder Using Flexible Partial Denture in Intellectural Disability Patient with Missing Lower Incisors

    최해인 | Byungjai Choi | HYUNG JUN CHOI and 2other persons | 2013, 40(4) | pp.306~313 | number of Cited : 1
    Abstract PDF
    Speech is complex psycho-physiological mutual process which includes many orofacial organs. Especially, teeth play an especially important role as an articulation organ in conjunction with the lips and tongue. When teeth are missing, the position of tongue and mandible is adjusted to produce correct sound. If a patient’s adaptive function is inadequate for modification of malocclusion, prosthodontic and orthodontic interventions are necessary. Missing teeth of young patients should be reconstructed bacause it can cause malocclusion, decreased masticatory efficiency, articulation disorders, esthetic problem, and temporomandibular disorder. Valplast􀋓(Valplast International Corp, New York, USA) flexible denture is useful for rehabilitation due to its excellent physical properties, esthetics, and small volume. This case is regardingan intellecturally disabled patient with anarticulation disorder caused by missing lower incisors due to trauma. The patient showed improvement in articulation by using flexible partial denture. The purpose of this report is to figure out the influence of missing lower anterior teeth on articulation.
  • 10.

    Management of Eruption Disturbances of the Mandibular First Molar : A Case Report

    전현순 | Yang Yeon Mi | Byeong Ju Baik and 1other persons | 2013, 40(4) | pp.314~320 | number of Cited : 0
    Abstract PDF
    With a prevalence rate of 0.01%, the presence of eruption disturbances of mandibular first molar has rarely been in populations. Eruption disturbances of permanent molars have been usually manifested as impaction,primary retention, and secondary retention. The treatments of eruption disturbances are carried out by: periodic observation; surgical exposure; forced eruption after surgical exposure; forced eruption with luxation; surgical repositioning; and extraction. This case report show successfully erupted mandibular first molars by various treatment methods on five patients diagnosed with impaction, primary retention, and secondary retention,respectively. Eruption disturbances of the mandibular first molar can be properly diagnosed with impaction,primary retention, and secondary retention by clinical and radiographic examination at normal eruption time of the mandibular first molar. The treatment should be done synthetically, considering eruption state of affected tooth, the relationship between the affected tooth and the adjacent or opposite tooth, the patient’s age, treatment compliance, and economic state.
  • 11.

    Successful Conservative Surgical Treatment of Ameloblastic Fibroma in the Posterior Maxilla : A Case Report

    이영은 | 안효정 | 이수언 and 2other persons | 2013, 40(4) | pp.321~327 | number of Cited : 0
    Abstract PDF
    Ameloblastic fibroma (AF) is a rare odontogenic ectomesenchymal tumor that is frequently seen in the first two decades of life, and occurs in the mandible. The most proper management of AF has been a recent topic of debate because of its recurrence and malignant transformation. This report describes AF in a 4-year-old male,which was a unilocular radiolucency on the maxillary right primary molar area with a scalloped border and corticated margin. The tumor was treated conservatively with enucleation and curettage, and the decision was made to preserve the right primary second molar. A biopsy confirmed it as AF. During the 43 months of followup,the patient had no evidence of recurrence or malignant transformation. Moreover, the radiographic examination revealed the generation of tooth germ to be a permanent second premolar. This report shows a case of AF in the posterior maxilla of a 4-year-old boy and discusses the conservative therapeutic approach to this tumor. Therefore, the age of the patients should be an important consideration when choosing conservative or radical surgery in a young AF patient.
  • 12.

    Conservative Surgical Treatment of Keratocystic Odontogenic Tumor : A Case Report

    Seyoung Shin | Yang Yeon Mi | KIM JAE GON and 1other persons | 2013, 40(4) | pp.328~334 | number of Cited : 1
    Abstract PDF
    The keratocystic odontogenic tumor (KCOT) is a unique cyst because of its locally aggressive behavior, high recurrence rate and characteristic histological appearance. Various options are available for treatment. While some clinicians advocate aggressive forms of dental treatment, others prefer more conservative therapy. In this study, two types of conservative surgical procedures were performed to treat the tumor; marsupialization and cyst enucleation. The patients showed healing process on conservative surgical treatment and teeth erupted without recurrence. Conservative surgical treatment can be an effective treatment option for young children because of their efforts to preserve teeth and other anatomical structures.
  • 13.

    Maxillary Incisor Replacement with the Ectopically Erupting Canine : Case Reports

    임지은 | Chul Choi Sung | 박재홍 and 3other persons | 2013, 40(4) | pp.335~341 | number of Cited : 0
    Abstract PDF
    Impacted maxillary canines are the most frequently impacted teeth after the third molars. The exact etiology of impacted maxillary canines is unknown, but several complications may result from impacted maxillary canines. An early detection of ectopically erupting teeth can lead to performing interceptive treatment such as early extraction of primary canine and provide the best long-term results. In the absence of prevention, clinicians should consider orthodontic treatment followed by surgical exposure of the canine to bring it into occlusion. However, in cases when the finding ectopically erupting teeth and severe root resorption of adjacent teeth are found late, malposed canine can replace the injured teeth. In these presented cases, early diagnosis and treatment of ectopic eruption and root resorption were not performed. The maxillary incisor replacement with ectopically erupting canine can be the alternative treatment of choice with successful results. The reconstructed canine is planned to be checked periodically for the condition of composite resin restoration. Orthodontic treatment and dental implant are planned. This report shows that when early diagnosis was not done, maxillary incisor replacement with ectopically erupting canine could prevent uncertain prognosis of the adjacent teeth with root resorption and provide esthetic satisfactory with time saved and cost reduced.
  • 14.

    Globalization of the Research Information

    Jong-Soo Kim | 2013, 40(4) | pp.342~345 | number of Cited : 1
    Abstract PDF
    The current trend of Korean-based journals is to become international journals. Support from academic societies and the government to improve the quality of journal and achieve internationalization is growing. For world-wide dissemination of journal contents, an online peer-review system and high quality journal web site are required. Also journals should be written in English. Proper publication ethics is also needed. For this article, I researched the current status of the ‘Journal of the Korean academy of Pediatric Dentistry’and have made some suggestions to help with this journal’s internationalization process for the future.