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2017, Vol.44, No.3

  • 1.

    A Prognostic Assessment of First Permanent Molars Showing Molar-Incisor Hypomineralization Based on Restorative Materials and Defect Class

    하나 | 김영진 | Kim, Hyun - Jung and 1other persons | 2017, 44(3) | pp.263~271 | number of Cited : 1
    Abstract PDF
    The objectives of this study were to classify the first permanent molars showing molar-incisor hypomineralization (MIH) on the basis of defect size and to assess differences in the prognoses of restorations performed with different materials. The first permanent molars with MIH and posteruptive breakdown were categorized into MIH class I, II, and III. After performing restorations, retreatment frequencies were examined according to the defect class and initial restorative material used. Sealants, composite resins, and stainless steel crowns showed the highest survival rates in cases of MIH class I, II, and III defects, respectively.
  • 2.

    In Vitro Evaluation of Microleakage and Penetration of Hydrophilic Sealants Applied on Dry and Moist Enamel

    구재원 | Jewoo Lee | Jiyoung Ra | 2017, 44(3) | pp.272~279 | number of Cited : 1
    Abstract PDF
    This study aimed to evaluate the microleakage and penetration of two hydrophilic sealants, Embrace Wetbond™ and Ultraseal XT® hydro™, when applied on dry and moist enamel, as compared to a conventionally used hydrophobic sealant, Clinpro™. A total of 60 sound human third molars were randomly divided into 5 groups according to the enamel moisture control and the sealant material used. After sealant application, the teeth were thermocycled and immersed in 1% methylene blue dye. Subsequently, the teeth were sectioned twice and the sections were examined using an optical microscope and image analysis software. Application of Embrace Wetbond™ on either dry or moist enamel resulted in more microleakage than Clinpro™. Application of Ultraseal XT® hydro™ on dry enamel showed a similar level of microleakage to Clinpro™, but application on moist enamel resulted in more microleakage. There were no significant differences between the groups in penetration. In conclusion, application of hydrophilic sealants on moist enamel did not improve the sealing ability and showed lower sealing ability than that of Clinpro™ applied on dry enamel.
  • 3.

    Retrospective Study of Characteristics and Treatment of Dentigerous Cysts Involving the Maxillary Anterior Tooth

    서예진 | 김영진 | Kim, Hyun - Jung and 1other persons | 2017, 44(3) | pp.280~288 | number of Cited : 0
    Abstract PDF
    The aim of the present study was to identify the clinical characteristics and treatment outcomes associated with maxillary anterior dentigerous cysts in children. Among 55 patients who had been diagnosed with maxillary anterior dentigerous cysts, 33 patients had cysts located in the incisor region and 22 had cysts located in the canine region. Cysts in the incisor region were 7.2-fold more prevalent in male patients, while cysts in the canine region were 1.75-fold more prevalent in female patients. For cysts in the incisor region, marsupialization was performed in 21 cases and enucleation in 12 cases. In the canine region, marsupialization was performed in 20 cases and enucleation in 2 cases. Spontaneous eruptions of the displaced teeth in the incisor and canine region were 90% and 54.5%, respectively. Among patients which spontaneous eruption occurred, patients with cysts in the incisor region underwent orthodontic treatment more often due to malocclusion. This study is expected to be used as fundamental data for establishing future treatment plans by providing the analyzed results of distribution and characteristics of dentigerous cysts involving the maxillary anterior tooth.
  • 4.

    Histopathological Observation of Three Types of Root Resorption Surface in Maxillary Primary Incisors

    나혜진 | Je Seon Song | SEONG OH KIM and 3other persons | 2017, 44(3) | pp.289~297 | number of Cited : 0
    Abstract PDF
    Local and general factors have been attributed to root resorption occurred by injuries such as trauma and dental caries that affect periodontal ligament or dental pulp tissue. Pathologic root resorption is different from physiologic root resorption in terms of resorption pattern such as micromorphology of resorption fossae and types of observed cells. Microscopic morphologies and histologic features of physiologic and pathologic root resorption surface of maxillary primary central incisors resulting from trauma and periapical inflammation were observed by scanning electron microscope and light microscope. The morphology of physiologic resorption lacunae was small and oval or circular shape with regularities. The morphology of pathologic resorption lacunae was large and polygonal shape with irregularities compared with the physiologic resorption lacunae. Multinucleated giant cells and mononuclear cells were closely attached to the physiologic and pathologic resorption lacunae, whereas several kinds of mesenchymal cells with numerous inflammatory cells were found in the areas adjacent to the pathologic resorption surface. Compensating cementum formation took place along some of the areas of physiologic and pathologic resorption area resulting from trauma, but could not be observed on pathologic resorption area resulting from periapical inflammation.
  • 5.

    A Pilot Study of Relationship Between Early Childhood Caries Experience and Chair–side Test Results for Caries-Risk Assessment

    허선재 | Shin Teo Jeon | Hong-Keun Hyun and 4other persons | 2017, 44(3) | pp.298~305 | number of Cited : 2
    Abstract PDF
    This study aimed to compare chair-side test results for caries risk assessment and evaluate how well the tests reflect caries experience. The study was conducted on children aged < 6 years in primary dentition. Dental examination of children was conducted to determine the dmft index and subjects were divided into two groups : group Ⅰ (dmft < 6), group Ⅱ (dmft > 6). This study used four kinds of test kits (Plaque-check PH kit, Saliva-check buffer kit, Saliva-check mutans kit, Cytoperio analysis system). Saliva buffer capacity was significantly low in the high caries experience group (dmft > 6) and correlated with dmft index. Saliva pH level correlated significantly with saliva buffer capacity. The results showed that plaque pH and saliva pH levels had no correlation with dmft index. The Streptococcus mutans level measured by using the Saliva-check mutans and Cytoperio analysis system did not correlate with dmft index.
  • 6.

    Effects of Children's Drinks on the Color Stability of Strip and Zirconia crown

    정일용 | Seoksoon Yi | Haney Lee and 3other persons | 2017, 44(3) | pp.306~316 | number of Cited : 0
    Abstract PDF
    The purpose of this study was to evaluate the effects of exposure to various children’s drinks on the color stability of anterior primary teeth and different esthetic restorative materials clinically used in pediatric dentistry. Exfoliated maxillary primary central incisors that had been unaffected by caries were chosen as control group. Maxillary primary central incisor-shaped specimens made of strip crown and Nu-smile zirconia crowns were chosen as test groups. Polished strip resin crowns were additionally prepared to compare with unpolished strip resin crown. Each specimen and teeth were divided into 4 groups in which the test samples (n=5 each) were immersed in 4 different drinks (distilled water, cola, grape juice, jelly juice) for 6 days. In all 4 drink groups, all specimens generally showed increasing ΔE * value (color difference) with time. Polished resin strip crown had higher ΔE * value than the unpolished in cola, grape juice and jelly juice groups. ΔE * value of zirconia crown in cola, grape juice and jelly juice groups were significantly different (p < 0.05). In conclusion, dietary control of children’s drinks is required for preventing discoloration of restorative materials.
  • 7.

    Prognostic Factors Influencing Survival and Success Rates of Autotransplanted Maxillary Canine

    김동현 | Hong-Keun Hyun | Kim, Young J and 1other persons | 2017, 44(3) | pp.317~326 | number of Cited : 0
    Abstract PDF
    The aim of this study was to investigate the survival and success rates of autotransplanted maxillary canine at the artificially formed recipient socket and evaluate the factors that influence survival and success rates. A total of 28 children who had 37 impacted canines were reviewed over the mean observation time of 25.1 months. Tooth mobility, pathologic root resorption, vertical bone loss, periapical lesion and anklyosis of donor tooth were investigated clinically and radiographically. The survival rate was 100%. The success rate was 64.9%, because 13 teeth were evaluated as unsuccessful. Significant parameter in determining the success rate of autotransplantation was enlarged follicle size of donor tooth according to Cox proportional hazard regression model. The results provide information necessary for clinician to make a better treatment decision about autotransplantation at the artificially formed recipient socket.
  • 8.

    The Study of Personality Types between Pediatric and Other Dental Residents

    장석훈 | Sunah Kim | NAM OK HYUNG and 3other persons | 2017, 44(3) | pp.327~334 | number of Cited : 0
    Abstract PDF
    The purpose of this study was to compare the personality types between pediatric and other dental residents. 77 pediatric dental residents and 71 other dental residents in Korea were surveyed by Myers-Briggs Type Indicator questionnaire. Myers-Briggs Type Indicator (MBTI) had 4 personality dichotomies consisting of 2 opposite characteristics that were extraversion / introversion, sensing / intuition, thinking / feeling, and judging / perception. Combinations of these four dichotomies could make 16 personality types. The percentage of pediatric dental residents was higher in sensing and judging, but there were no statistically differences. The majority of personal type was ISTJ in both groups. Statistical significance observed only in gender. The ratio of thinking was higher in male than in female (p < 0.05). The meaning of this study was the first survey performed on the personality types between pediatric dental residents and other dental residents in Korea. Further study with pre-survey orientation and increased sample size should proceed.
  • 9.

    Evaluation of Microhardness of Bulk-base Composite Resins According to the Depth of Cure

    Yoomi No | Bisol Shin | Jong-Soo Kim and 1other persons | 2017, 44(3) | pp.335~340 | number of Cited : 0
    Abstract PDF
    Composite resin becomes an essential material in pediatric dentistry. However, incremental filling of composite resin to minimize the polymerization shrinkage takes time. To reduce the polymerization shrinkage, clinicians and researchers have focused on bulk-filling materials. Bulk-base composite resin is newly introduced as bulk-filling composite resin. The purpose of this study was to evaluate microhardness profile of bulk-base composite resin according to the depth of cure. A high flow bulk-base material and a low flow bulk-base material were used for experimental group, and a conventional composite resin was used for control group. Each group consist of 20 specimens, 3.5 × 3.5 × 5.0 mm mold was used to make specimen. Specimens were sectioned at the 2 mm and the 3 mm depth with milling machine. Microhardness profile was measured at the surface, 2 mm depth, 3 mm depth, and 4 mm depth. Microhardness of control group showed statistically significant difference (p < 0.05) according to the polymerization depth. In contrast, experimental group showed no statistically significant difference, except between 0 mm and 4 mm at HFB, 0 mm and 2 mm, 0 mm and 3 mm at MFB. At the surface and the 2 mm depth, the control group showed higher microhardness than the experimental groups (p < 0.05). However, at the 4 mm depth, the experimental groups showed significantly higher microhardness (p < 0.05). The results from this study, the bulk-base composite resin showed higher microhardness at the 4 mm and lower microhardness at the surface and the 2 mm depth. Therefore, if bulk-base resin overcomes the mechanical weakness, it could be considered using in pediatric dentistry.
  • 10.

    Effect of Blood Decontamination on Orthodontic Bracket Bonding

    이재희 | JISUN SHIN | Jong-Soo Kim | 2017, 44(3) | pp.341~349 | number of Cited : 0
    Abstract PDF
    Blood decontamination is an important factor in success of the orthodontic bracket. The purpose of this study is to evaluate the shear bond strength affected by blood decontamination. The shear bond strength was measured on blood decontamination before and after primer photopolymerization. And the adhesive remnants type and surface patterns was evaluated under scanning electron microscopy. A total of 50 human premolars were prepared. Group Ⅰ was attached using conventional resin-acid etching method as control group. Group Ⅱ and Ⅲ were blood contaminated before curing primer and groups Ⅳ and Ⅴ were blood contaminated after curing primer. Group Ⅱ and Ⅳ were treated only with cotton pellet and Groups Ⅲ and Ⅴ were treated with cotton pellet after water washing. The mean shear bond strengths were in the order of groups Ⅰ, Ⅴ, Ⅲ, Ⅱ, and Ⅳ. In scanning electron micrographs group III and V showed more uniform surface than group II and IV. The ARI was significantly different between the control group and the experimental groups (p <0.05).
  • 11.

    Comparison of Mineralization in Each Passage of Dental Pulp Stem Cells from Supernumerary Tooth

    JISUN SHIN | Kim Jongbin | 2017, 44(3) | pp.350~357 | number of Cited : 1
    Abstract PDF
    The purpose of this study was to evaluate the difference of differentiation potential in each passage of dental pulp stem cells from supernumerary tooth (sDPSCs). The sDPSCs were obtained from a healthy 6-year-old male patient under the guidelines and got the informed consent. Cells were cultured until passage number 16 and divided into two groups; 1 - 8 passages as a young group and 9 - 16 passages as an old group. It was taken 2.25 ± 0.46 days in a young group and 3.25 ± 0.46 days in an old group to propagate cells of each passage until confluence and there were statistically significant differences between two groups (p < 0.05). In every passage, cell morphology was observed with microscope and evaluated the capacity to form high levels of minerals by alizarin red solution staining after treating differentiation medium. Fibroblast-like, spindle shaped, elongated cells and a few nodules were found in uninduced cultures of passage number 1, 8 and 9. But at 16 passage culture, cell size became larger and broader and observed with more nodules. After inducing differentiation, mineralized nodules were detected at the first passage of 7th day culture whereas at the 8 passage culture, nodules were seen clearly at 14th day culture. In addition, the amount of mineralized nodules were remarkably decreased after passage 9. From the data presented in this study, it is recommended to use sDPSCs of passage number within 8 for utilizing as stem cells.
  • 12.

    An Evaluation of Shear Bond Strength of New Dentin Bonding Agents

    JISUN SHIN | 황은지 | Kim Jongbin | 2017, 44(3) | pp.358~364 | number of Cited : 1
    Abstract PDF
    For the purpose of convenience and reducing time, newer bonding agents have been developed for composite resin restoration. Recently developed one bottle bonding system including etching, primer and adhesive can make procedures simpler and less technique-sensitive than old generation adhesives. The aim of this study was comparing the shear bond strength of new dentin bonding agents to the 5th generation bonding agent which had an etching step. 78 premolar teeth were randomly divided into three groups which were treated with Tetric® N-Bond Universal (Ivoclar Vivadent, Liechtenstein), GC® G-Premio BOND (GC Co., Japan) without additional etching step and 3M™ Single Bond2 (3M ESPE, USA) with an etching step following manufacturer’s instructions. Filtek™ Z-350 (3M ESPE, USA) composite resin was applied and light cured over bonding agents. For shear bond strength evaluation, universal testing machine was used with a wedge technique. As a result, shear bond strength of one step bonding agents was lower than two step bonding agent and there were statistically significant differences between them (p < 0.05). In addition, within the result of two new bonding agents, Tetric® N-Bond Universal showed significantly higher shear bond strength than GC® G-Premio BOND (p < 0.05).
  • 13.

    Hypersensitivity to Local Anesthetics: A Case Report

    나유진 | Jewoo Lee | Jiyoung Ra | 2017, 44(3) | pp.365~369 | number of Cited : 0
    Abstract PDF
    Local anesthetics are widely used in clinical dentistry. However, while rare, there have been some reports of true hypersensitivity to local anesthetics. A case of hypersensitivity in a 26-month-old boy is reported. After administering local anesthesia with lidocaine, treatment was performed while the patient was under oral sedation. After treatment, the patient presented with lower lip edema. Treatment with anti-histamines and a steroid successfully reversed his symptoms.
  • 14.

    Molar-Incisor Malformation: Three Cases of a Newly Identified Dental Anomaly

    최수지 | Jewoo Lee | Jihyun Song | 2017, 44(3) | pp.370~377 | number of Cited : 1
    Abstract PDF
    Molar-incisor malformation (MIM) is a recently described dental anomaly characterized by root malformation in permanent first molars accompanied sometimes by abnormal root forms in primary second molars or enamel defects in maxillary central incisors. This report presents three cases of MIM along with a review of previous studies. Three patients exhibited abnormal root forms in the permanent first molars, with varying degrees of deformation. Two of the patients experienced medical events at birth. One of the patients was a monozygotic twin, whose twin sister exhibited normal dentition without any significant abnormalities. The present report also reviews recently reported cases of MIM in literature. In the management of MIM-associated clinical issues, consideration of microscopic features and accompanying characteristics might facilitate early diagnosis and comprehensive treatment planning.
  • 15.

    Green Teeth Associated Hyperbilirubinemia in Primary Dentition

    Min Kyung Park | CHUNG-MIN KANG | Lee Hyo-Seol and 1other persons | 2017, 44(3) | pp.378~383 | number of Cited : 0
    Abstract PDF
    There are many reasons for tooth discoloration. An increase in the bilirubin level may cause tooth discolorations. Such cases are rare, but most involve tooth discoloration with a greenish hue. The purpose of this case report is to describe green discoloration of the primary dentition in the presence of neonatal hyperbilirubinemia. 2 boys aged 16 and 22-months presented with chief complaints of erupting teeth of abnormal color. Their primary teeth exhibited a greenish discoloration along enamel hypoplasia. Both patients were born prematurely with a low birth weight and had been diagnosed with neonatal hyperbilirubinemia. Systematic diseases can affect the hard tissue of teeth during their formation and result in changes in tooth color. Periodic follow-ups are required for establishing a normal dental condition and meeting the esthetic needs of patients. A pediatric dentist may be the first person to observe patients with discoloration in their primary dentition. In such cases the dentist can deduce the systematic disease responsible for this discoloration.
  • 16.

    Factors Affecting the Psychology of Pediatric Patients

    Seunghoon Yoo | 2017, 44(3) | pp.384~389 | number of Cited : 3
    Abstract PDF
    The resistance to dentistry is as old as the history of dentistry. Historically, dental treatment techniques have continued to evolve to minimize pain with effective treatment, but the negative perception of dentistry has not been reduced as much as the development of technology. Particularly, children have a lack of resistance to external stimuli, mental development and patience, and the degree of cooperation with dental care is reduced due to changes in parenting methods including parental influence, so can experience DFA(dental fear and anxiety) and DBMP(dental behavior management problem). Among the various stimuli experienced by the child in the dentist, psychological factors affecting the dentist, dental clinic, and social factors affect the formation of the relationship with the dentist. Especially in recent years, the addiction related to smartphone is emerging as a social problem, and the effects of smartphone addiction on the oral cavity and the effects on dental behavior are examined.