• Journal of Technologic Dentistry
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• v.23 no.2
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• pp.75-93
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• 2002

This research was preformed for the purpose of preparing the items of standard model of the national dental technician test base on the duty analysis of the dental technician. The results of the duty analysis for the dental technician follows. 1. The dental technician is a profession to make the oral function smooth through the dental supplement and equipment in a scientific method and the skilled technique. 2. The duty of the dental technician are determined as A. preparation for manufacture B. manufacture C. management of the place of the dental technology D. self-development. A. The field of "the preparation for manufacture" are determined as 1. to confirm work authorization 2. To confirm the working model, B. The field of "In manufacture" are determined as 1. to manufacture the temporary crown 2. to manufacture the inlay and crown & bridge prosthesis 3. to manufacture the porcelain fused metal crown prosthesis 4. to manufacture the all ceramic crown prosthesis 5. to manufacture the temporary denture prosthesis 6. to manufacture the partial denture prosthesis 7. to manufacture the complete denture prosthesis 8. to manufacture the attachment prosthesis 9. to manufacture implant prosthesis 10. to manufacture the removable orthodontic device, 11. to manufacture the fixed orthodontic device, 12. to manufacture the orthodontic study cast C. The field of "in management of the dental lab." are determined as 1. management 2. to control the dental lab. D. The field of "In the self-development" are determined as 1. to improve the professionalism 2. self-control. 3. The developing items selected under the duty evaluation of the dental technician are l7s in the manufacture preparation, 1,011s in the manufacture, 7s in the management for the dental technology, 5s in self-development, and in all together 1,040s

• Journal of Technologic Dentistry
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• v.28 no.2
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• pp.399-415
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• 2006

This research collected the curriculum for Dental Technology from a total of 20 schools-eighteen 3-year colleges and two 4-year colleges all in Korea. We divided 4 groups as regions from 20 colleges, and we compared the credit of university students who finished all the required courses and want to apply for a national examination and the credit to be had from another educational institution. As a result of this analysis, we get the conclusion below: 1. In the curriculum, average credit are shown like this order: Science of Dental materials 5.45 Orthodontics Technology 4.10 Dental Morphology 3.80 Oral Anatomy 3.05 Dental Health Science 2.45 Public Health Science 2.40 These show that the credit of fundamental studies, which is in order to take Dental Prosthetics, is increased. 2. In the curriculum, average credit are shown like this order: Crown and Bridge Technology 7.25 Removable Partial Dentures Technology 6.55 Complete Dentures Technology 6.40 Dental Ceramics 4.95 Inlay Technology 2.30 3. In the curriculum, average credit are shown like this order: Crown and Bridge Technology(Lab) 5.90 Removable Partial Dentures Technology(Lab) 5.35 Complete Dentures Technology(Lab) 5.30 Dental Ceramics(Lab) 4.35 Average points between regions in the subject of a national written exam are mostly similar, but the deviation among Science of Dental Materials, Crown and Bridge Technology, Removable Partial Dentures Technology, and Complete Dentures Technology is large. And in the practical technique exam, the deviation among Crown and Bridge Technology(Lab), Removable Partial Dentures Technology(Lab), and Complete Dentures Technology(Lab) is great.

• Journal of Technologic Dentistry
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• v.21 no.1
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• pp.115-121
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• 1999

This investing was carried out to evaluate the alteration of stress distribution on teeth and esthetic crowns. Analyzing the stress distribution by the two-dimensional finite element methods, a model of lower 1st molar according to the porcelain fused metal crown an the porcelain fused glass ceramic core crown and the all glass ceramic crown. 1. The pattern of stress distribution showed no apparent differences. 2. The greatest von Mises values were concentrated around the central fossa of all esthetic crowns. The greatest Maximum principle value were concentrated around the interface between the base of esthetic crown and the abutment tooth. It was found that the apatite glass ceramic could be applicable for use in dental crown prosthesis.

• Journal of Technologic Dentistry
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• v.24 no.1
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• pp.19-31
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• 2002

The purpose of this study was to examine the respiratory system health condition of dental technicians and to be of use for more successful health management and health promotion for them. The subjects in this study were 155 dental technicians who were working in North Jeolla province. Out of them, 70 dental mechanics were investigated in 1993, and 85 were surveyed in 2001. And the reports of the two groups on respiratory distress, including cough, sputum, phlegm, the notable sound of breathing, nasal discharge, coryza, shortness of breath and gasping, were compared. The findings of this study were as below: 1. The cough report rate was 24.3% in 1993 and 16.5% in 2001. There appeared approximately 7.8% decrease between the two years. The most powerful variables included working hours and age. 2. The complaint rate of sputum and phlegm was 47.1% in 1993 and 43.5% in 2001. The rate of 2001 reduced by 3.6%. Whether or not they smoked was identified as the most influential variable. 3. The report rate of shortness of breath and gasping was 7.4% in 1993 and 12.9% in 2001, and this rate showed about 1.5% increase in the latter year. The biggest variables were working hours and career. 4. The complaint rate of nasal discharge and coryza was 41.4% in 1993 and 44.7% in 2001, which showed about 3.3% increase. The largest variables were smoking and career. 5. The report rate of the notable sound of breathing and breathing in light little gasps was 12.0% in 1993 and 17.6% in 2001. There was approximately 5.6% increase, and the most powerful variables were working hours and career.

• Journal of Technologic Dentistry
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• v.21 no.1
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• pp.165-187
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• 1999

We are studied the improvement syllabus of subjects in demtal technological curriculum that those are Tooth Morphology, Science of Dental Materials, Inlay Technology, Occlusal Anatomy and Dental Orthodontic Technology. Those improvement syllabus will be contributed to the achievement of national educational standards and arrangement to the technical performance of medical imaging procedure with the smallest exposure dose and the personal attributes of compassion, courtesy and concern in meeting the needs of the patients, and have a good knowledge of the dental technician professional competence.

• Journal of Technologic Dentistry
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• v.32 no.2
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• pp.91-102
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• 2010

Purpose : The purpose of study was 500 people who are not related to dentistry in order to survey image about dental technicians. Methods : The subjects were composed of 500 people who are not related in Daegu Metropolitan city. This study was done using the Statistical Package for Social Sciences 17.0 for Windows. As for the analysis methods, the study used the frequency analysis, percentage, mean, t-test, analysis of variance. Results : The score on the image of dental technicians declined in the order of occupational image(2.98), work image(3.14), personal image(3.26), social image(2.87). 'It is hard and stressful' in the occupational image had the highest score with 3.69, 'Dentist and companionship are strong' in the occupational image had the lowest score with 2.21. 'It need expert knowledge and a skilled technology' in the work image had the highest score with 3.69, 'Health medical treatment side of health technique is occupation.' in the work image had the lowest score with 3.69. 'It always work busily' in the personal image had the highest score with 3.69, 'It is value and is effect work.' in the personal image had the lowest score with 3.69. 'An employment is easy after license acquisition.' in the social image had the highest score with 3.69, 'It admit independence' in the social image had the lowest score with 3.69. Conclusion : Dental technition research in order to image improvement and recognition, as the medical professional must construct the desirable dental technition image and recognition.

• Journal of Technologic Dentistry
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• v.25 no.1
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• pp.9-20
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• 2003

Using a nickel-chrome casting alloy called 'Rexillium V' which is also available as base metal alloy for dental ceramic crown, 4 types of mixtures(A, B, C, D) with old and new metal were prepared for cyclic casting. The results of cyclic casting can be outlined as follows: 1. For Vickers hardness after casting, specimen A and D tended to have lower hardness in the course of cyclic casting, while specimen B and C tended to higher hardness. 2. The results of X-ray diffraction analysis showed that major crystal phase contained nickelchrome compounds and carbide. 3. The observation results of SEM photographs after cyclic casting show that there was a significant tendency to have similar structures among experimental groups. 4. The results of EDX analysis after cyclic casting showed that there were little differences in chemical composition between parent metal and base metal alloy. Although industrial nickel-chrome cast alloy did not show any significant change in material properties even through cyclic casting over several times, it is recommended that more there be more in-depth studies on how to detect any potential corrosion, discoloration and toxication of dental ceramic crown implanted in patient's oral cavity.

• Journal of Technologic Dentistry
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• v.23 no.1
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• pp.75-83
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• 2001

This study was conducted to find antibacterial agent against growth of dental caries bacteria. St. mutans KDJ-50 from various medicinal plants of which safety was indetified. Medicinal plants used in this study was dried and grinded after purchased at Daegu yakryung sijang and Kyungsan jungang sijang. Medicinal plants extracted with 80% ethanol at boiling point for 3 hrs was used as antibacterial agent after freeze dried. This study was conducted to find antibacterial agent against growth of dental caries bacteria. St. mutans KDJ-50 from 32 medicinal plants of which safety was indetified. The result of using paper disc method. Caryophylli Flos. Coptidis Rhizoma. Phellodendri Cortex. Schizamdrae Fructs. Myristicae Semen, Crataegi Fructus and Acori Graminei Rhizoma was selected as antibacterial agent. The result of viable cell counting method. the antibacterial activity of Caryophylli Flos was highest among tested 7 medicinal plants followed by Phellodendri Cortex and Coptidis Rhizoma. The extinction effect of the St. mutans by Caryophylli Flos was shown with the addition of 0.5 (w/v) in the medium. The high antibacterial activity was acquired at high extraction temperature and long extraction temperature. The antibacterial activity of Caryophylli Flos was not effected by the concentration of ethanol.

• Journal of Technologic Dentistry
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• v.33 no.1
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• pp.15-23
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• 2011

Purpose: Thy yttria tetragonal zirconia polycrystalline(Y-TZP) is a good structural ceramic for dental restoration. But it have a problem that delamination of veneering ceramic from the Y-TZP core materials. The problem generally occur at the interface, thus this study was conducted to evaluate the interface of Y-TZP using scanning electron microscopy(SEM). Methods: To investigate this aspect, high-resolution SEM observations were made of polished and etched (HF content gel) cross-sections of the interface area. Dry and moist veneering porcelain powders were built up on the zirconia base. Results: The extent of this surface faceting is dependent upon the moisture content of the porcelain powder and the firing temperature. More moisture and higher final heating temperature accelerates the observed faceting of the Y-TZP grains at the interface to the veneering ceramic. Conclusion: These changes of the Y-TZP grains indicate that destabilization of the tetragonal phase of zirconia occurs at the interface during veneering with ceramic. It may result in a reduction of the stability of the zirconia and interface.

• Journal of Technologic Dentistry
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• v.28 no.2
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• pp.321-329
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• 2006

The popularity of Ni-Cr-Mo based metal alloys for metal-ceramic crown have increased recently because of low price, superior yield strength and rigidity. the use of these alloys give them the potential advantage of thinner copping with the required rigidity for long span bridges. The purpose of this study was to assess the microstructures and mechanical properties of Ni-Cr-Mo-(Si,Al,Nb,Zr,Ti.Cu,Mm) based Alloys not containing beryllium(Be) related toxic effects. The abtained results indicated that as-cast these specimen alloys showed compositional and microstructural differences, and mechanical properties values of Ni69Cr20Mo5Si2Al4 alloy among these specimen alloys was found to be superior to those of commercial Ni-Cr based alloy using in market place today.