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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Korean Acedemy of Dental Technology
Journal Basic Information
Journal DOI :
Korean Academy of Dental Technology
Editor in Chief :
Volume & Issues
Volume 26, Issue 1 - Jul 2004
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A Study on the Increase of Dental Technicians in Korea and the Regional Distribution of the Korea Dental Technician Association Members
Kwon, Soon-Seog ;
Journal of Korean Acedemy of Dental Technology, volume 26, issue 1, 2004, Pages 9~34
The present study reviews the license registration status of dental technicians and dentists from 1970 to 2002, the number of technician members of The Korea Dental Technician Association from 1990 to 2003, and the number of dentist members in 2003. It also considers the yearly membership fluctuations, its growth rates, yearly increase/decrease, the rate of dentist to dental technician, regional distribution of association members, regional yearly increase/decrease of the members, and the regional distribution of dentists and dental technicians. The purpose is to identify and predict the problems in the demand/supply of dental technicians and the regional imbalance of manpower distribution. By doing so, this study attempts to propose the appropriate standard for the supply of dental technicians and point out the necessity of making mid- or long-term plans for ensuring the efficiency of manpower supply and balanced regional distribution. The result is as follows: 1. The number of dental technicians and dentists in 2002 has grown 36.79 and 9.27 times from 1970, and 2.20 and 2.05 times from 1990, respectively. It tool 11 years for the twofold increase of dental technicians from 1990, one year faster than the same increase of dentists. The number of dental technicians per a dentist was the lowest in 1972 (0.21 person), and the highest in 2002 (0.86 person). Specifically, the fastest growth was observed for a year from 1983 (0.47 technician per a dentist) to 1984 (0.6). From 1984 to 1986, the ratio grew by 0.1 every year. Summing up the numbers of dentists and dental technicians who passed the national certification examination, this study predicted the number of dental technicians per a dentist to be 0.88 in 2003, and 0.90 in 2004. 2. From 1990 to 2003, the average distribution of dental technician was 71.76% in the metropolitan areas and 28.24% in other smaller regions. The proportion of dental technicians working in the three major cities (Seoul, Busan, and Daegu) was the lowest in 2001 (52.39%) and the highest in 1996 (62.66%). The majority number of dental technicians who practiced in the metropolitan areas (about 70% of the entire population) were in service in the three major cities. 3. Compared with 1990, the number of dental technicians in 2003 grew 2.28 times in the large cities, and 2.05 times in other smaller regions. The yearly growth rate was the highest in 1994 over the previous year: 26.06% in large cities and 17.86% in the other regions. In the large metropolitan cities, the growth rate was the highest in Incheon (5.8 times for 5 years from 1998 to 2003), In the rest of the regions, the increase of dental technicians was the highest in Gyeonggi (6.5 times from 1990 to 2003). 4. In 2003, as much as 73.40% of all the members of the Korea Dental Technician Association were distributed in the large metropolitan cities, and the rest 26.60% were in other smaller regions. Meanwhile, 54.35% of the dentists practiced in the metropolitan cities, and the rest 45.65% were in service at other regions. This result indicates that more dental technicians than dentists are concentrated in large cities. More than half of all the technician members of the Association are distributed in the three major cities (i.e. Seoul, Busan, Daegu). On the other hand, 42.03% of dentist members are in these three cities and 53.97% of them practice in Seoul, Gyeonggi, and Busan. In 2003, the ratio of dentist to dental technician is 1:0.43 in general, while the ratio is 1:0.58 in the metropolitan cities, and 1:0.43 in other regions. In 2003, 33.30% of all the certified dental technicians are the member of the Korea Dental Technician Association, while 66.82% of all the licensed dentists are its members.
Evaluation of Corrosion Resistance of Ti-Zr-Nb-Pd Based Alloys for Biomedical applications by electron Theory
Jung, Jong-Hyun ; Sun, Gum-Ju ;
Journal of Korean Acedemy of Dental Technology, volume 26, issue 1, 2004, Pages 35~40
In order to understand alloying effects on the corrosion resistance of Ti-(10
8%)Nb-0.2%Pd alloys, Polarization curves were measured at 5%HCI solution. The results were interpreted in terms of two parameters obtained by the molecular orbital calculation ; one is the bond order(
) and the other is the metal d-orbital level(
is a measure of the strength of covalent bonds between titanium and alloying elements.
is correlative with the electronegativity of elements. It was found that increasing of Zr and Nb with higher
values showed a lower critical anodic current density in the polarization curve and hence higher corrosion resistance. On the other hand, increasing of Zr and Nb with higher
values showed a higher corrosion resistance.
Anodic Polarization Characteristics in Ti-20%Zr(-5%Cr) Alloys for Dental Castings
Jung, Jong-Hyun ; Han, Sok-Yoon ;
Journal of Korean Acedemy of Dental Technology, volume 26, issue 1, 2004, Pages 41~48
Ti-20%Zr(-5%Cr) alloys not containing harmful Al and V were newly designed in order to reveal their possibility for dental casting and melted in an arc melting and casting furnace under Ar atmosphere. The corrosion resistance was studied by anodic polarization test. From the observation of anodic polarization behavior, it was found that the corrosion resistance was markedly increased by the addition of Cr. The corrosion resistance of Ti-20%Zr-5%Cr alloy was superior to that in Ti-6%Al-4%V alloy but almost similar to that in CP Ti using in market place today.
Photopolymerization efficiency of dental resin composites with new mixed photosensitizers
Sun, Gum-Ju ; Jung, Jong-Hyun ;
Journal of Korean Acedemy of Dental Technology, volume 26, issue 1, 2004, Pages 49~58
Two diketones, 1-phenyl-1,2-propanedione(PD) and 2,3-butanedione (BD) were investigated as new visible light photosensitizers for a dental resin composite of bis-GMA in order to improve photopolymerization effect. And the photopolymerization efficiency of mixed photosensitizers, PD-CQ and DA-CQ, was studied. Photopolymerization effect of photosensitizers were compared with that of camphorquinone(CQ), the most widely used photosensitizer. The photopolymerization efficiency of bis-GMA containing the photosensitizer increased with irradiation time. The increase was in the order: BD < CQ < PD. The photopolymerization efficiency of this mixture was not so efficient as CQ or PD.
A Study on the recognition of dental lab technicians in Busan about the retitle of ‘Dental Technician’
Kim, Bu-Sob ; Chung, In-Sung ;
Journal of Korean Acedemy of Dental Technology, volume 26, issue 1, 2004, Pages 59~67
The purpose of this study was to research the recognition of Korean Dental Technicians in Busan region about retitle of the name of 'Dental Technician'(DT), then to figure out the reality of retitle of the name(DT), so to provide data for whole country survey and to drive of the retitle of DT by Korea Dental Technicians Association. For these purpose, 250 subjects were sampled out of dental technicians in Busan, and the survey was performed with self-administered questionnaire. Out of all collected questionnaires, 192 pieces(76.8%) were addressed for this study. 1) Their desires on changing of the name(DT), 57.4%(74/129) was agreed. 2) If they could change the name(DT), they hope 3 main new names and the others, Dental Lab Art Technician(39.2%), Certified Dental Technician(23.0%), Dental Prosthetic Technician(23.0%), the others(14.8%).
A 3-dimensional Finite Element Analysis of Stress Distribution in the Supporting Bone by Diameters of Dental Implant Fixture
Lee, Myung-Kon ;
Journal of Korean Acedemy of Dental Technology, volume 26, issue 1, 2004, Pages 69~76
The objective of this finite element method study was to analyze the stress distribution induced on a supporting bone by 3.75mm, 4.0mm, 5.0mm diameter of dental implant fixture(13mm length). 3-dimensional finite element models of simplified gold alloy crown(7mm height) and dental implant structures(gold cylinder screw, gold cylinder, abutment screw, abutment, fixture and supporting bone(cortical bone, cancellous bone) designs were subjected to a simulated biting force of 100 N which was forced over occlusal plane of gold alloy crown vertically. Maximum von Mises stresses(MPa) under vertical loading were 9.693(3.75mm diameter of fixture), 8.885(4.0mm diameter of fixture), 6.301(5.0mm diameter of fixture) and the highest von Mises stresses of all models were concentrated in the surrounding crestal cortical bone. The wide diameter implant was the good choice for minimizing cortical bone-fixture interface stress.
Effects of Heat-treatment on Crystallization and Mechanical Properties of Glass ceramics for Dental crown prosthesis in the system
Chung, In-Sung ; Kim, Bu-Sob ;
Journal of Korean Acedemy of Dental Technology, volume 26, issue 1, 2004, Pages 77~88
Glass ceramics for dental crown prosthesis were prepared by crystallization of CaO-MgO-SiO2-P2O5-TiO2 glasses. Their crystallization behaviors have been investigated as a function of heattreatment temperature and holding time in relation to mechanical properties. The results are as follows: Vickers hardness and bending strength of glass ceramics increased due to the precipitation of apatite, whitlockite,
-wollastonite, magnesium titanate, and diopside crystal phases within glass matrix. The final crystalline phase assemblages and the microstructures of the glass ceramics were found to be dependent on heat-treatment temperature and holding time. Vickers hardnes and bending strength of glass ceramics increased with increasing heat-treatment temperature and holding time.
Effect of pH and Reaction Temperature on Mechanical Properties of Hydroxyapatite for Dental prosthesis
Chung, In-Sung ; Her, Ho-Young ;
Journal of Korean Acedemy of Dental Technology, volume 26, issue 1, 2004, Pages 89~96
Hydroxyapatite powder were synthesized by precipitation method, varying pH, and reaction temperature. The powders were heated at 1,200
for fabrication of dental prosthesis. The results are as follows: Synthesized powder showed the smallest particle in size, under the conditions of pH 11 and reaction temperature 37
. The hydroxyapatite was partially converted to
-TCP at 1,200
. Mechanical strength of sample was affected by such powder preparation conditions as pH and reaction temperature and sintering temperature. The mechanical strength of sample prepared under the same conditions was increased with increasing pH, reaction temperature and sintering temperature.
A Study on Oxidation Behavior and Cytotoxicity Test of Ti-10Ta-10Nb Alloy
Cho, Hong-Kyu ; Lee, Doh-Jae ; Lee, Kwang-Min ; Lee, Kyung-Ku ;
Journal of Korean Acedemy of Dental Technology, volume 26, issue 1, 2004, Pages 97~104
A new Ti-10Ta-10Nb alloy has designed and examined some possibility of forming more passive oxide film by oxidation treatment which is closely related to corrosion resistance and biocompatibility. Ti-6Al-4V and Ti-10Ta-10Nb alloys were prepared by consumable vacuum arc melting and homogenized at 1050
for 24hours. Alloy specimens were oxidized at the temperature range of 400 to 750
for 30minutes, and the oxide films on Ti alloys were analysed by optical microscope, SEM, XPS and TGA. Cytotoxicity test was performed in MTT assay treated L929 fibroblast cell culture by indirect method. It is found out that the oxide film on Ti-10Ta-10Nb alloy is denser and thinner compared to Ti-6Al-4V alloy. The weight gain during the oxidation was increased rapidly at the temperature above 650
for Ti-6Al-4V alloy and above 700
for Ti-10Ta-10Nb alloy respectively. It was analysed that the passive film of the Ti alloys consisted of TiO2 through X-ray photoelectron spectroscopy (XPS) analysis. It is found out by cytotoxicity test that moderate oxidation treatment lowers cell toxicity, and Ti-10Ta-10Nb alloy showed better result compared to Ti-6Al-4V alloy.
A Study on the Castability Depending On Angle and Direction of Sprue and Wax Pattern
Koh, Myoung-Won ; Choi, Un-Jea ; Chung, Hee-Sun ;
Journal of Korean Acedemy of Dental Technology, volume 26, issue 1, 2004, Pages 105~114
This study obtained the following consequences, as a result of the comparative analysis for the castability depending on an angle of the sprue and wax pattern in case of manufacturing dental prostheses, for the castability depending on direction, and for the castablility of sprue, which attached the reserve to each different 3.5mm roll wax(sprue wax) and to 2.5mm sprue wax. 1. As a result of the comparative analysis for the castability depending on an angle of the sprue and wax pattern, the best castability was shown when the angle of the sprue and wax pattern is 180
(straight line), and the lowest castability was shown in 45
, which was curved most, and there was no statistical significance. 2. As a result of the comparative analysis for the castability of an angle depending on direction, the best castability was shown in the farthest side from the direction of centrifugal casting, and the lowest castability was shown in the same side as the direction of centrifugal casting, and there was no statistical significance. 3. Given comparing the castability depending on the pattern of sprue, the better castability was shown in 135
when using 3.5mm roll wax(sprue wax), compared to attaching the reserve to 2.5mm sprue wax.
Optical and Mechanical Properties of Commercial Dental Enamel Porcelain
Park, Hyung-Rang ;
Journal of Korean Acedemy of Dental Technology, volume 26, issue 1, 2004, Pages 115~128
In this study, optical and mechanical properties were investigated with 4 kinds of commercial dental enamels. As a result of EDS analysis
were the main components of commercial dental enamels. In case of H specimen, content of
were more than that of another specimens. Starting powder and fired specimens were glass ceramics which were consist of amorphous phase and leucite (crystalline) phase. Crystallization did not occurred during firing process, since the XRD peak intensity was similar between starting powder and fired specimens. As a result of differential thermal analysis,
and crystalline temperature was varied with composition in the range of
respectively. 0.5mm thickness dental enamel specimens showed sufficient translucent properties. However, transmittance and reflectance were lower than 5% result from scattering due to the refractive index difference between glass and crystalline phase. 3 point bending strength was in the range of 73.9
101.8MPa which was similar or slightly higher than enamel of natural teeth and Vickers hardness was higher than enamel of natural teeth more than 100.
Study on Analyzing Main Cause of Dental Technicians' Moraleand Management to Promote their Morale
Kim, Jung-Sook ;
Journal of Korean Acedemy of Dental Technology, volume 26, issue 1, 2004, Pages 129~138
The organization to which we belong is the place where we make social relationships, satisfy our desires of self-realization, and accomplish our common object. The emotional and psychological state of individual as well as the whole organization is able to be explained in the concept of morale. The researcher selected a total 238 dental technicians living in seoul, and conducted a research in a period ranging from April 1, 2004, to April1 10, 2004. The researcher analyzed the findings with the aid of SPSS (Statistical package for social sciences). The researcher came to reach the following conclusions on the basis of frequency, percentage, T-test, F-test, and multiple regression. The results of this study were as follows: First, there is a significant difference in recognizing morale due to their age, academic background, their work places, position, part of objective, and working hours(p<.05). Secondly, The researcher there is a significant difference in recognizing due to their social welfare, payment, fair and objective personnel management, enough opportunities of self development, and autonomy(p<.05). Lastly, this study is very limited in generalization because it deals with a small part of morale management plans and objectifies very limited organization. But, it is very meaningful in trying to approach morale management plans with an object of dental technicians. It is necessary that dental technicians should make efforts to control themselves.
A study of hydroxyapatite coating on Ti-6Al-4V dental implant alloy with different surface treatments using a sol-gel derived precursor
Han, Sok-Yoon ;
Journal of Korean Acedemy of Dental Technology, volume 26, issue 1, 2004, Pages 139~144
In the present study, a simple method was successfully used for hydroxyapatite coatings on Ti-6Al-4V substrates deposited by using a sol-gel derived precursor. Prior to hydroxyapatite coating the samples were micropolished (0.1 micron) and divided into three sets. The first set,were the micropolished samples kept as such. The second set were coated with titania sol and the third set was treated with 5M NaOH. After three repetitions of hydroxyapatite coating procedures on each set and heat treatment at 600
, the formation of hydroxyapatite has been confirmed by XRD analyses and the substrate material was found to be oxidized with negligible amount of CaO in the coating. The SEM studies revealed surface morphology. Hydroxyapatite, calcined at 600
, displaying a porous structure arisen from heating of the bulk. But, it is very meaningful in trying to approach morale management plans with an object of dental technicians. It is necessary that dental technicians should make efforts to control themselves.
Gold Electroforming System(GES)를 이용한 도재관 제작
Sin, Jong-U ;
Journal of Korean Acedemy of Dental Technology, volume 26, issue 1, 2004, Pages 149~156
Gold Electroforming System을 이용한 브릿지 제작법
Han, Seok-Yun ;
Journal of Korean Acedemy of Dental Technology, volume 26, issue 1, 2004, Pages 157~163
Avana Solid Abutment를 이용한 상부 보철물 제작
Byeon, Tae-Hui ; Park, Hyo-Ryeon ;
Journal of Korean Acedemy of Dental Technology, volume 26, issue 1, 2004, Pages 165~170
Gold Electroforming System을 이용한 텔레스코픽 덴쳐 제작
Sin, Jong-U ;
Journal of Korean Acedemy of Dental Technology, volume 26, issue 1, 2004, Pages 171~176
INNOVATIONS IN ESTHETIC RESTORATIONS
Yu, Dong-Ryeol ;
Journal of Korean Acedemy of Dental Technology, volume 26, issue 1, 2004, Pages 177~183
Gold Electroforming System을 이용한 임프란트 SCRP 고정 방식의 수복물 제작
Na, Taek-Man ;
Journal of Korean Acedemy of Dental Technology, volume 26, issue 1, 2004, Pages 185~187
GES를 이용한 전치부 브릿지 제작과정에 관하여
Na, Taek-Man ;
Journal of Korean Acedemy of Dental Technology, volume 26, issue 1, 2004, Pages 189~194
Provisional Restoration과 Gingival Embrasure
Son, Yeong-Seok ;
Journal of Korean Acedemy of Dental Technology, volume 26, issue 1, 2004, Pages 195~202
WOL-CERAM SYSTEM (EPC-CAM)에 대하여
Ryu, Jae-Gyeong ;
Journal of Korean Acedemy of Dental Technology, volume 26, issue 1, 2004, Pages 203~207
Implant supported over denture with O-ring abutment
Lee, Sung-Uck ; Lee, Jung-Hwan ; Park, Hyo-Ryun ;
Journal of Korean Acedemy of Dental Technology, volume 26, issue 1, 2004, Pages 209~216
The purpose of this study is to introduce how to make implant supported over denture with Oring. Many kinds of attachments have used to dental restorations. The application of attachment has widely increased implant fixed prosthesis and implant supported over denture. In order that implant supported over denture have properly retention, generally used O-ring, magnetic, bar attachment. O-ring give us an advantage that is required more minimum vertical dimension than bar-type and easily replace with new part. When we make these prosthesis using O-ring, Bar, Ball attachment, we should following procedures. Strong occlusion force leads to fracture of over denture because part of functional mechanism as implant abutment or attachment is spaced. Clips are regularly activated. O-ring and springs are changed every year. The pattern of resorption should be carefully monitored and compensated for by relining procedures. If the over denture appears to rest on the bar or the ball attachments, relining should be performed and clips/caps should be changed.