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2014, Vol.41, No.2

  • 1.

    Effect of Various Surface Treatment Methods on Shear Bond Strength of Orthodontic Brackets to Aged Composite Resin

    박종철 | Howon Park | LEE JU HYUN and 1other persons | 2014, 41(2) | pp.125~133 | number of Cited : 0
    Abstract PDF
    The purpose of this study was to investigate the effect of various surface treatment methods on the shear bondstrength of orthodontic brackets in vitro. Ninety six specimens, 6 mm in diameter and 5 mm in height, were made with composite resin (FiltekTM Z350XT, 3M ESPE, USA) and treated with an aging procedure. After aging, the specimens were randomly separatedin six groups: (1) control with no surface treatment, (2) 37% phosphoric acid gel, (3) 4% hydrofluoric acid gel,(4) sodium bicarbonate particle abrasion, (5) diamond bur, and (6) 1 W carbon dioxide laser for 5s. The metalbrackets were bonded to composite surfaces by means of an orthodontic adhesive (Transbond XT, 3M Unitek,USA). Shear bond strength values were evaluated with a universal testing machine (R&B Inc., Korea). Analysis of variance showed a significant difference between the groups. Group 5 had the highest mean shearbond strength (11.9 MPa), followed by group 6 (11.1 MPa). Among the experimental groups, group 2 resultedin the weakest mean shear bond strength (5.22 MPa). The results of this study suggest that the repair shear bond strength of the aged composite resin was acceptableby surface treatment with a carbon dioxide laser.
  • 2.

    The Distribution of Patients and Treatment Trends in the Department of Pediatric Dentistry, Yonsei University Dental Hospital for Last 5 Years

    강정민 | Lee Hyo-Seol | HYUNG JUN CHOI and 3other persons | 2014, 41(2) | pp.134~144 | number of Cited : 14
    Abstract PDF
    The aim of this study was to investigate changes in treatment patterns within pediatric dentistry departmentsby analyzing the distribution of patients and treatment trends. To that end, treatment charts based on electronicmedical records (EMR) from the Yonsei University Dental Hospital from 2008 to 2012 were collected and analyzed. The results showed a decrease in the number of new patients and patients cared for by non-specialists, whilethe number of foreign patients has increased. The under 2 years-old group accounted for a large portion of newpatients. Dental caries, dental trauma, and malocclusion ranked as the top complaints. In terms of restorationtreatment, the proportion of patients receiving composite resin, amalgam, and sealant has decreased, whereasself-curing glass ionomer and preventive resin restoration have increased. Single-visit endodontic treatment hasbeen increasing, with a decreasing trend in multi-visit endodontic treatment. The rate of conservative pulptreatment, such as pulp capping and pulpotomy, has increased. For reducing patient anxiety, treatments undersedation have increased, especially with the use of nitric oxide. This investigation into the latest treatment trends and patient characteristics is expected to help pediatricdentists to make appropriate treatment plans.
  • 3.

    Inpatient Dental Consultations to Pediatric Dentistry in the Yonsei University Severance Hospital

    주기훈 | JAE HO LEE | Je Seon Song and 1other persons | 2014, 41(2) | pp.145~151 | number of Cited : 3
    Abstract PDF
    The goal of this study was to describe dental consultation of pediatric inpatients to the department of pediatricdentistry at Yonsei University Severance Hospital. 391 dental consultations at Yonsei University SeveranceHospital referred to pediatric dentistry in the year 2012 were included in this study. Consultations were categorizedaccording to patients’gender, age, chief complaint, referred department and diagnosis. 288 patients (166males and 122 females) with an average age of 5.9 were referred to the Department of Pediatric Dentistry. 129cases (33.1%) from Department of Rehabilitation Medicine, 80 cases (20.5%) from Pediatric Hematology-Oncology, 51 cases (13.0%) from Pediatric Cardiology, and 44 cases (11.3%) from Pediatric Neurology. Chiefcomplaints were ranked from oral examination (39.7%), dental caries (14.0%), pre-operative evaluation(12.8%) and others (33.5%); including oral pain, trauma, tooth mobility, orthodontic treatment, self-injury,fabrication of obturator and etc. Dental consultations should be encouraged as dental care and treatment couldaffect the control of systemic diseases of admitted patients. Pediatric inpatients have been referred to pediatricdentistry for not only comprehensive oral exam but also various chief complaints. The most frequent dental diagnosismade and treatment performed were dental caries and non-invasive/preventive care respectively.
  • 4.

    Evaluation of New LED Curing Light on Resin Composite Polymerization

    강지은 | 전새로미 | Kim Jongbin and 2other persons | 2014, 41(2) | pp.152~156 | number of Cited : 1
    Abstract PDF
    The purpose of this study is to compare efficiency of broad spectrum LEDs (VALOⓇ, Ultradent, USA) withconventional LED curing lights (EliparTM Freelight 2, 3M ESPE, USA) using a microhardness test. The light curing units used were VALOⓇ in three different modes and EliparTM Freelight 2. The exposure timewas used according to the manufacturer's instructions. After cured resin specimens were stored in physiologicalsaline at 37℃ for 24 hours, microhardness was measured using Vickers microhardness tester. The microhardnessof upper and lower sides of the specimens were analyzed separately by the ANOVA method (Analysis ofVariance) with a significance level set at 5%. At upper side of resin specimens, an increased microhardness was observed in the broad spectrum LED curinglight unit with a high power mode for 4 seconds and plasma emulation mode for 20 seconds (p < 0.05). However, at the lower side of resin specimens, there were no significant differences in microhardness betweenbroad spectrum LED curing light unit and conventional LED curing light unit.
  • 5.

    Orthodontic Treatment of an Impacted Immature Tooth Using C-tube as a Skeletal Anchorage : Case Reports

    최수연 | 공은경 | 정규림 and 1other persons | 2014, 41(2) | pp.157~165 | number of Cited : 0
    Abstract PDF
    Skeletal anchorage is recommended as an orthodontic treatment for an impacted immature permanent tooth. Among these methods, C-tube is relatively safe because it is fixed to the cortical bone of interdental and thelower part of the root with several short miniscrews, which causes less damage to the root in patients of earlypermanent dentition. As it can be easily bent, the traction direction can be adjusted to favorable bone densitysites. However, patient cooperation is important and traction based on physiological force in order to gain rootand dentoalveolar tissue development in immature permanent teeth is required. Periodic follow-ups should bemandatory.
  • 6.

    Basal Cell Nevus Syndrome : A Case Report

    김지연 | Sohee Oh | 2014, 41(2) | pp.166~173 | number of Cited : 1
    Abstract PDF
    The basal cell nevus syndrome is also known as the Gorlin-Goltz syndrom. It is a dominant autosomal disorderwhich is characterized by keratocystic odontogenic tumors in the jaw, skeletal abnormalities, and multiple basalcell nevi carcinomas. This study reports an 11-year-old boy with multiple odontogenic keratocysts in the jaw,hypertelorism, and frontal bossing. When a young patient has cystic lesions with an impacted permanent teeth,it is important to preserve the teeth. For a growing patient with impacted permanent teeth, a more conservativemethod is suggested, which will enable the preservation the permanent teeth in Gorlin-Goltz syndrome.
  • 7.

    Conservative Endodontic Treatment of Type Ⅲ Dens Invaginatus : Case Report

    Wansun Jo | LEE NAN YOUNG | LEE, SANG-HO | 2014, 41(2) | pp.174~179 | number of Cited : 1
    Abstract PDF
    Dens invaginatus is a developmental anomaly resulting from an infolding of the enamel organ into the dentalpapilla prior to calcification of the dental tissue. Clinical and radiographic presentation of dens invaginatus shows a lot of variation. The classification proposedby Oehlers(1957) is most commonly used among classifications of dens invaginatus. Several treatments have been suggested to treat Type Ⅲ dens invaginatus where the pulp remains healthybut the invagination is associated with a periodontitis. The top priority objective is to preserve pulp as sound aspossible. Thus, if there is no definite evidence of pulpal disease, the conservative access which treat invaginationas distinct from the pulp is necessary. But, Endodontic treatment of Type Ⅲ dens invaginatus has the particular problems associated with achievingadequate chemomechanical debridement of the root canal system and invagination, predictable length controland consistent filling. In this case report, the endodontic treatment limited within invagination was performed for treatment of TypeⅢ dens invaginatus, and filling with Mineral Trioxide Aggregate(MTA) resulted in good prognosis.
  • 8.

    Managing Complications Related to Multiple Supernumerary Teeth

    Kim Jongbin | 2014, 41(2) | pp.180~186 | number of Cited : 3
    Abstract PDF
    One or two mesiodens are mostly common to the clinician. However, three mesiodens is rarely found and cancause complications such as orthodontic problems or interruptions of the adjacent teeth with more than 1 or 2mesiodens. Many factors cause irregularities in the permanent dentition. Mesiodens, especially in the anterior maxilla,can disturb the eruption of adjacent permanent teeth and cause diastemas, ectopic eruptions, root resorption, orthe formation of dentigerous cysts. The early diagnosis of mesiodens is important for preventing such complications,and the timing of intervention should be based on their location and number. Periodic checkups and improveddiagnostic devices make it easy to find mesiodens and associated complications. In this case, 3 supernumerary teeth in the maxillary anterior region were affecting the eruption of the adjacentpermanent incisors. To minimize complications and preserve the deciduous teeth, the three supernumerary teethwere extracted in 2 steps. Since cone-beam computed tomography was not available, a brace wire was used to measure the depth of themesiodens.
  • 9.

    Institutional Review Board and Research Ethics

    Kim Jongbin | Jong-Soo Kim | 2014, 41(2) | pp.187~192 | number of Cited : 3
    Abstract PDF
    Research ethics is the basic attitude for researchers. Thanks to our predecessors we are able to conduct systematic studies. The current trend of results and the amount of study-oriented assessments make the side effect that researchers conduct SCI (Science Citation Index) studies. Since the Declaration of Helsinki, the importance of the right, safety and welfare for human participants have improved. In the present study, I looked into other countries’standpoints concerning the subject of the responsibilities for research ethics and compared them with Korean’s standpoint. Recently, the Ministry of Health and Welfare revised the laws for bioethics and safety. In the point of bioethics, I checked out the function, exemption and process of the Institutional Review Board for the future researcher. It is suggested to use the research note to verify a study procedure and protect oneself from research misconducts.