• Journal of Technologic Dentistry
• /
• v.35 no.3
• /
• pp.185-192
• /
• 2013

Purpose: The aim of this study was to compare with color reproducibility of the coating method and dipping method using a colour liquid. Methods: Two groups of square-shaped specimens ($10mm{\times}10mm$ in diameter, 1.5mm thickness) were prepared for analysis(n=15/group). The CM(Coating Method) group was fabricated as full zirconia specimens with the coating coloring method and Group DM(Dipping Method) was prepared as specimens of 0.7 mm-thick zirconia plate using the dipping coloring method and veneered with 0.8mm-thick porcelain. Color parameters were measured with ShadeEye $NCC^{(R)}$ spectrophotometer and color differences were calculated using the equation ${\Delta}E^*= \{({\Delta}L^*)^2+({\Delta}a^*)^2+({\Delta}b^*)^2\}^{1/2}$. Non-parametric statistical methods, the Mann-Whitney test, and the Kruskal-Wallis test were used to analyze the data. Type one error rate was set at 0.05. Results: Color difference values larger than 7 were observed between specimens with the coating method and the dipping method, which were detectable difference in a clinical setting. Conclusion: Cautious application of the coating coloring method in a clinical setting and further researches to standardize the coating method are needed.

• Journal of Korean society of Dental Hygiene
• /
• v.10 no.3
• /
• pp.531-540
• /
• 2010

Objectives : In this study, following the cavity restorations with low copper conventional alloy, high copper admixed one and high copper unicompositional one, which are used the most frequently in a clinical setting at the present, to experiment the time-dependent changes of strength, bubbles were examined. Besides, to examine the detrimental effects of mercury contained in dental amalgam, the amount of mercury release was evaluated. Methods : As dental amalgams which were used herein, [BESTALOY], [Hi-Aristaloy 21] and [Sybraloy] were selected for a low-copper conventional amalgam, a high-copper admixed one and a high-copper unicompositional one in the corresponding order. The formation of bubbles and the weight ratio of mercury release were evaluated using a field emission scanning electron microscope (FE-SEM). Thus, the following results were obtained: Results : 1. The time-dependent amount of mercury release reached a statistical significance in three types of alloys, which was shown in such a descending order as [BESTALOY], [Hi-Aristaloy 21] and [Sybraloy]. 2. A low-copper conventional type, BESTALOY is a cutting type and it was found to have an increased formation of fine bubbles. In the remaining two types, [Hi-Aristaloy 21] (a high-copper admixed alloy) and [Sybraloy] (a high-copper unicompositional alloy), the time-dependent changes in the formation of bubbles was negligible. Conclusions : Accordingly, this type of mercury release from amalgam alloy denotes the difference in the weight ratio of total constituents between after 24 hours and after two weeks. But further studies are warranted to examine the amount of mercury release which is detrimental to human bodies. Besides, a low-copper conventional alloy is a cutting type and it was characterized by the abundant formation of bubbles in a time-dependent manner. This implies that the strength of amalgam is impaired, which should be considered in selecting the appropriate amalgam alloy in a clinical setting.

• Journal of Korean society of Dental Hygiene
• /
• v.15 no.5
• /
• pp.849-856
• /
• 2015

Objectives: The purpose of the study is to investigate the influence of social characteristics and self leadership on stress coping method in the dental hygiene students. Methods: A self-reported questionnaire was completed by 436 dental hygiene students in J area from November 10 to December 10, 2013. The questionnaire consisted ofsocial characteristics of the subjects, self leadership, and stress coping method. The reliability was evaluated by Cronbach alpha. Data were analyzed by frequency, one-way ANOVA, multiple regression analysis using the SPSS 12.0 statistical package program. The self leadership was developed by Mans and adapted and modified by Kim and Park. The leadership included 18 questions of self expectation, rehearsal, goal setting, self reward, self criticism, and constructive area. The stress coping method was developed by Folkman and Lazarus, and adapted and modified by Park. The stress coping method included 24 questions of problem focused coping, seeking social support, emotion focused coping, and wishful thinking. Results: The best stress coping method was wishful thinking and the score was 2.81. The priority order of stress coping method included social support, problem focused coping, and emotion focused coping. The self-expectation, goal setting, self-criticism proved to be highly relevant factors. The explanation power of stress coping method was 29.1 percent. The self expectation, rehearsal, self reward, and self criticism were passive coping methods and the explanation power was 15.4 percent. Conclusions: The self leadership is the most important factor to fulfill the interpersonal relationship abilities, major satisfaction, and satisfaction with clinical practice. The self leadership leads to stress coping ability.

• The Journal of the Korean dental association
• /
• v.47 no.5
• /
• pp.291-296
• /
• 2009

Purpose : The aim of this studγ was to evaluate the patient's and dentist's perspective and knowledge on rapid human immunodeficiency virus screening test in dental setting. Material and Methods: In March 2009, 100 patients and 100 dentists at College of Dentistry, Yonsei University were provided an attitude assessment survey. Results : Results were analyzed for acceptance of testing and potential barriers. 94% of patients agreed to take a rapid HIV screening test and 77% of dentists were willing to provide the test to their patients. Also the current knowledge state of patients and dentists on HIV infection was not accurate as expected. Conclusion : Overall, dental clinic patients widely accepted the offer of rapid oral HIV screening. Rapid HIV screening test in the dental setting ran be an important option to increase the number of individuals who know their HIV status.

• The Journal of the Korean dental association
• /
• v.48 no.11
• /
• pp.813-818
• /
• 2010

Since MTA has many beneficial properties such as biocompatibility, great sealing capacity, antibacterial effects, low cytotoxicity, and stimulation of formation of mineralized tissue, it has been widely used as the material of choice in root-end filling, apexification, pulpotomy, perforation repair and so on. However, despite its favorable characteristics, MTA presents working properties which are less than ideal. The resulting cement from the mixing of powder and water is difficult to manipulate, and its setting time has been reported to be 2 h 45 min whereas the working time is <4 minutes. Additional moisture is also required to activate the setting of the cement. Moreover, according to recent studies, the physical properties of MT A may be hampered by acidic environment or blood contamination. Therefore, practitioners may have surprisingly worse results than they expected when they are not fully acquainted with the characteristics and manipulation method of MTA.

• Journal of Dental Anesthesia and Pain Medicine
• /
• v.19 no.1
• /
• pp.67-72
• /
• 2019

Myasthenia gravis (MG) is a neuromuscular autoimmune disorder which clinically presents as muscular weakness and fatigue due to autoantibody formation against acetylcholine receptors (AChR), leading to their subsequent destruction. Due to the neuromuscular implications of MG, certain considerations must be taken into account when providing anesthesia to MG patients. In the following case report, we have outlined procedural considerations for the anesthetic management of a patient with MG undergoing deep sedation for an elective oral surgery in an outpatient setting, as well as a discussion of relevant literature.

• Journal of Technologic Dentistry
• /
• v.5 no.1
• /
• pp.5-11
• /
• 1983

In order to ascertain the aspects of the dental technicians training system which require improvement, and also to provide important data for use in setting up dental technicians manpower planning, our country's dental technicians training and employment status has been studied and analyzed. The objects of the survey are 1896896 dental and Social Affairs from 1965 to 1982. The results were as follows; 1. Education organs for dental technicians are education system such as health junior college and service training systems. About 965 dental technicians have come from the service training systems and 931 technicians have come from health junior college in our country. 2. Total number of employment of dental technicians employed in our country are 820, and 292 of them are engaged in Seoul, So unbalanced employment of dental technicians will be troubled in a future. 3. All registrated to government are 1,896 till 1982 and 820 of them engaged are that is, we can suppose about employment of dental technicians in a future, 3,746 dental technicians will registrate to Health and Social Administration an 1992, and 1,482 of them will be able to take their job in Korea.

• Journal of Industrial Technology
• /
• v.36
• /
• pp.45-48
• /
• 2016

The purpose of this study is to evaluate and compare wettability and setting time of twelve polyvinylsiloxane impression pastes. For comparing the wettability, the contact angle of a water drop on the impression materials was measured. It is important for impression materials to have higher wettability when trying to make impressions of interproximal spaces and gingival crevices. The higher wettability the better the material will flow into these spaces and the more accurate the impression. An ideal impression material will have adequate working time but a fast intraoral setting time. The clinician needs time to inject material into the sulcus, place the impression material into the tray and position it in the mouth, but the material should set rapidly to reduce time in the patient's mouth. It is considered that the results obtained in this study will provide guideline information for the manufacturing of impression materials and for selecting appropriate impression materials.

• The Journal of the Korean dental association
• /
• v.49 no.12
• /
• pp.739-748
• /
• 2011

Patients with severe mental challenges are often subjected to extensive dental problems. Their impaired communication and lack of cooperation unable to receive timely dental treatments, which deteriorates their adverse oral conditions. In spite of a limited time frame, well-planned comprehensive treatments can be delivered in an one-day operation setting under general anesthesia. This multidisciplinary treatment regimen primarily comprises of single-visit endodontics, direct bonded restoration, periodontal treatment, and surgical extraction. Further, one or two additional visits for prosthetic procedures are able to accomplish functional reestablishment and esthetic enhancement. This article discusses on clinical managements for severely mentally challenged patients under a single-day operation.

• Proceedings of the KACD Conference
• /
• 2003.11a
• /
• pp.581-581
• /
• 2003

The purpose of this study was to search non-invasive and reproductive pulp test. Temperature of the crown surface was measured using the infrared thermography, and the pulp test was investigated with difference of crown temperature of the vital and the non-vital tooth in vitro and in vivo. Twenty extracted human maxillary central incisors were used in this study. Two sample teeth after access cavity preparation were arranged setting with one pair. Then, the each tooth wes estimated as the vital and the non-vital tooth.(중략)