• Restorative Dentistry and Endodontics
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• v.28 no.2
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• pp.156-161
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• 2003

The purpose of this study is to evaluate the polymerization ability of three different light sources by microhardness test. Stainless steel molds of 1, 2, 3, 4 and 5 mm in thickness of 7 mm in diameter were prepared. The hybrid composite Z100 was packed into the hole of the mold and curing light was activated for designated time. Three different light sources, conventional halogen, light emitting diode, and plasma arc, were used for curing of composite. Two different curing times applied ; one is to follow the manufacturers recommendation and the other is to extend the curing time of LED and plasma arc for balancing the light energy with halogen. Immediately after curing, the Vickers hardness was measured at the bottom of specimen. The results were as follows. 1 The composite cured with LED showed equal to higher microhardnesss than halogen. 2. The composite was cured with plasma arc by manufacturers recommendation showed lowest micro-hardness at all thickness. However, when curing time was extended, microhardness was higher than the others. In conclusion, this study suggested that plasma arc needs properly extended curing time.

• Journal of Korean Dental Science
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• v.15 no.2
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• pp.181-189
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• 2022

Molar incisor malformation (MIM) has been introduced as a new type of dental anomaly. Currently, the morphological and histological characteristics of MIM are known; however, its etiology has not been clearly identified. To date, the long-term prognosis of first permanent molars (FPM) affected by MIM has rarely been reported, and few treatment guidelines have been established. The purpose of this case report was to present guidelines for the extraction of FPM affected by MIM, depending on the presence of the third molar. In patients with a third molar, spontaneous mesial shift of the posterior molars might be induced by extracting the FPM at an appropriate time, that is, when the second permanent molar is at an early furcation stage of the tooth. However, it is recommended that FPM be preserved for as long as possible if a third molar does not exist. When an FPM needs to be extracted, it is suggested to consider space maintenance.

• The Journal of Korea Assosiation for Disability and Oral Health
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• v.7 no.1
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• pp.25-28
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• 2011

Autism is a developmental, neuropsychiatric disorder that begins in early childhood. A patient with autism seen in the dental office frequently may have many complications. Therefore, it may be needed to consider modified or alternative therapy for dental care of autistic patients. This is the case of a 16-year old boy who have autism. He came to the department of the pediatric dentistry, Yonsei University Dental Hospital, for evaluation and treatment of dentigerous cyst associated with impacted teeth(#33,34,35). Under daily hospitalization and general anesthesia, the cyst was enucleated with surgical extraction of #34 and autotransplantation of #33,35. And during the periodic dental followup, apexification of #33,35 was performed for periapical lesion and root maturity. At 2 year 6 months follow- up, now, bony healing was completed and there are some complications like external resorption of #33 and space loss of #34 area. Generally, the marsupialization has been widely recommended for treatment of dentigerous cyst. However, in this case, there is a little possibility of spontaneous eruption after marsupialization considering of patient's age, location and angulation of the impacted tooth, root maturity. And there is necessity to choose the treatment that has low recurrence risk and needs short-term follow-up for autism. Above all, poor oral hygiene and lack of cooperation for decompression treatment is a matter of primary consideration. Consequently, enucleation of the cyst was chosen for the final treatment plan in this case. It is important to consider the conditions that affect the eruption of a dentigerous cyst-associated tooth to predict the successful eruption and special health care needs of the patient when the treatment plan is settled.

• Journal of The Korea Institute of Healthcare Architecture
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• v.8 no.1
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• pp.29-36
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• 2002

From the latter half of 20's century, the numbers of dental service workers and dental facilities are noticeably increased and dental patients want the higher-classed and specialized dental service. For the increased facilities and user's needs at dental college hospital, the present condition of dentistry, special features and the field study at dental college hospital are surveyed for this study. The purpose of this study is to provide a architectural planning data on the dental college hospital for keeping up with the development of dentistry.

• The Journal of the Korean dental association
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• v.53 no.11
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• pp.770-778
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• 2015

This article discusses how to conduct treatment planning and decision making in special needs dentistry. Special needs patients often lack cooperative ability during dental treatment and have a deteriorated oral health status. To overcome the limitation in communication with special needs patients and solve their complicated dental problems, dentists need to have extensive preoperative information about the patients and their caregivers. Treatment procedures should be organized in a patient-centered and cost-effective manner. Additionally, clinical outcomes need to be predicted taking into consideration of the patients' condition. The clinical experience of committed dentists is another factor that enhances the benefits of extensive treatment in special needs patients with many limitations. The insightful treatment decision-making of dentists will contribute to improving the oral health of special needs patients despite the various obstacles.

• Journal of the Korean Academy of Esthetic Dentistry
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• v.31 no.1
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• pp.19-25
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• 2022

Expectation of the patient for esthetic improvement through the dental treatment is diverse and complicated. Chief complaints of patient should be translated to objective factors reflecting patient's needs and wants. Treatment planning would be based on these demands and verified through the communicating with the patient through the procedure. Esthetic approach in dental treatment include subjective elements as well as objective ones.

• The Journal of Korea Assosiation for Disability and Oral Health
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• v.9 no.2
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• pp.127-130
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• 2013

Hypoxic ischemic encephalopathy (HIE) is an important cause of permanent damage to central nervous system cells, most cases with oxygen deprivation in the nenonate due to birth asphyxia. Survival children with HIE develop problems such as cerebral palsy, mental retardation, learning difficulties, and other permanent neuro-developmental disabilities. This article report two cases of the children with HIE who had be traumatized on their teeth from oropharyngeal airway (OPA) in the emergency situation. The patients with the disease accompanying seizure or convulsion, needs special consideration for the prevention from dental trauma in emergency airway management.

• Journal of Dental Anesthesia and Pain Medicine
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• v.22 no.4
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• pp.239-254
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• 2022

The high success rate of dental treatment is dependent on the cooperation of pediatric patients during procedures. Dental treatment often causes pain, particularly in children. The factors in providing treatment to pediatric patients include the characteristics and location of the tooth, profoundness of the anesthesia including the type of local anesthetic, and cooperation of the patient. Previous studies have examined several techniques to successfully achieve profound pulpal anesthesia in maxillary permanent teeth. The dentist should select the injection technique to be used based on patient needs. In children, either buccal with palatal injections or buccal with intra-septal injections may be used to anesthetize the permanent maxillary first molar. Buccal with palatal injections are commonly used prior to routine maxillary dental procedures. Currently, there are only a few studies on the employment of buccal with intra-septal injections to anesthetize permanent maxillary first molars in pediatric patients. This review will focus on efficacy of buccal with palatal versus buccal with intra-septal pulpal anesthesia of the permanent maxillary first molars in pediatric patients and aim to determine which technique should be used during routine dental procedures.

• Restorative Dentistry and Endodontics
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• v.48 no.4
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• pp.33.1-33.12
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• 2023

Objectives: This study aimed to evaluate the bleaching efficacy and hydrogen peroxide permeability in the pulp chamber by the at-home bleaching gel in protocols applied on different dental surfaces. Materials and Methods: Forty premolars were randomly into 4 groups: control group no bleaching, only application on the buccal surface (OB), only application on the lingual surface (OL) and application in buccal and lingual surfaces, simultaneously (BL). At-home bleaching gel (White Class 7.5%) was used for the procedure. The bleaching efficacy was evaluated with a digital spectrophotometer (color change in CIELAB [ΔE_ab] and CIEDE 2000 [ΔE₀₀] systems and Whitening Index for Dentistry [ΔWI_D]). The hydrogen peroxide permeability in the pulp chamber (㎍/mL) was assessed using UV-Vis spectrophotometry and data were analyzed for a 1-way analysis of variance and Tukey's test (α = 0.05). Results: All groups submitted to bleaching procedure showed bleaching efficacy when measured with ΔE_ab and ΔE₀₀ (p > 0.05). Therefore, when analyzed by ΔWI_D, a higher bleaching efficacy were observed for the application on the groups OB and BL (p = 0.00003). Similar hydrogen peroxide permeability was found in the pulp chambers of the teeth undergoing different protocols (p > 0.05). Conclusions: The application of bleaching gel exclusively on the OB is sufficient to achieve bleaching efficacy, when compared to BL. Although the OL protocol demonstrated lower bleaching efficacy based on the ΔWI_D values, it may still be of interest and relevant in certain clinical scenarios based on individual needs, requiring clinical trials to better understand its specificities.

• Journal of dental hygiene science
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• v.16 no.5
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• pp.355-360
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• 2016

The purpose of this study was to examine unmet dental care needs and related factors among adults in Korea. The study included a nationally representative sample of Koreans (Korea National Health and Nutrition Examination Survey 2104). The dependent variable was unmet dental care need and the independent variables were socioeconomic status and oral health status. The chi-square test and logistic regression analysis were performed to identify the associations between explanatory variables and unmet dental care needs. The major causes of unmet dental care needs included economic burden, work life, and academic reasons; in addition, dental treatment was considered to have lower priority. The factors that had statistically significant relationships with unmet dental care needs were sex, age, self-rated oral health status, and difficulty in mastication. The findings of the study, suggest a need for lower dental insurance copayments in keeping with the policies and principles aimed at strengthening the national health insurance system. In addition, groups with limited access to dental services should be identified, and effective health care policies and services should be established for these individuals.