• 제목/요약/키워드: Dental Laboratory Technology

검색결과 686건 처리시간 0.026초

치기공과 학생들의 구강위생에 대한 지식 및 관리실태 (A Study on the oral health Status and Knowledge of Dental Laboratory Technology Students)

  • 최에스더;권은자
    • 한국산학기술학회논문지
    • /
    • 제12권11호
    • /
    • pp.5079-5086
    • /
    • 2011
  • 이 연구의 목적은 치기공과 학생들의 구강위생관리 실태 및 지식을 파악하여 지역사회의 구강건강을 향상시킬 수 있는 동기를 부여하고, 구강보건 교육에 도움이 되고자 함이다. 조사대상자는 충청도 소재 대학의 치기공과에 재학 중인 학생 160명을 대상으로 2010년 11월 10부터 12월 9일까지 설문조사를 실시하였고, 다음과 같은 결론을 얻었다. 일반적 특성에 따른 구강관리 지식차이는 성별로 남자가 여자보다 높았고, 연령별로는 연령이 높아질수록 높았고, 학년별 항목에서는 학년이 높을수록 높았고, 통계적으로 유의한 차이가 있었다(p<0.05). 구강위생관리 실태에 따른 구강관리지식차이는 일일 잇솔질 횟수가 5회 이상에서 가장 높았고, 잇솔질 방법은 옆으로 치아만 한다에서 높았다. 치간 칫솔 이용유무 항목에서는 사용한다가 높았고, 통계적으로 유의한 차이가 있었다(p<0.05). 따라서 전반적인 구강위생관리 실태는 구강보건교육의 경험이 있는 치기공과 학생들이 양호한 것으로 나타났으며, 이를 통해 수업시간에 계속적으로 구강보건교육을 받고 익히는 사람들에게서 구강건강관리가 달라지는 것을 알 수 있었다. 이에 지역사회에서도 구강보건교육의 기회를 확대시켜 국민의 구강건강을 향상시키도록 해야하겠다.

도재의 반복성이 Shade에 미치는 영향 (An Experimental study on The Porcelain Shade Stability after Repeated Firing)

  • 김웅철;이병기
    • 대한치과기공학회지
    • /
    • 제4권1호
    • /
    • pp.5-7
    • /
    • 1982
  • This study was performed to examine the effect of repeated firing on porcelain color stability. Sixty sepcimens of generally uniform size and shape(9.7 12mm)were prepared using the manufactorer's specifications and among them 50 specimens that showed no defect after firing procedure were selected. All samples, abraded with sandpaper disc, ultrasonically cleaned, and air fired to amedium glaze were devided into 10 groups according to the number of repeated firing and, upon completion, mounted on a 13 by 16cm board. 30 persons(five dentists, ten dental techanicians, and fiftheen students) were asked to compare the samples for variations, in hue, chroma and value under natural and artificial light. The results were as follows:(1) There were no color change detected in the first four firings.(2) Slight color change were noticed in subsequent firings(ie: greater decreases in value with slight increases In chroam)(3) However, the hue remained constant in all 10 groups after repeated firings.

  • PDF

구강 내 스캐너를 사용하여 CAD/CAM으로 제작된 왁스 코핑의 적합도 평가 (Evaluation of marginal and internal gap of wax coping fabricated by CAD/CAM system using intraoral scanner)

  • 김동연;정일도;이재준;김지환;김명배;김웅철
    • 대한치과기공학회지
    • /
    • 제37권1호
    • /
    • pp.1-7
    • /
    • 2015
  • Purpose: The aim of this study was to evaluate the marginal and internal gap of wax copings fabricated from extraoral scanning with intraoral scanning. Methods: Fifteen study models(abutment of teeth 16) were made by PMMA. STL files of thirty abutment were prepared by intraoral scanning with extraoral scanning. Wax copings of thirty fabricated using CAD/CAM system. Marginal and internal gap of wax copings of thirty were measured by silicone replica technique and digital microscope(${\times}140$). Date were analyzed by using independent samples t-test. Results: Mean (SD) of two group were measured $55.61(27.42){\mu}m$ for totally gap of ES group and $60.67(33.14){\mu}m$ for totally gap of IS group. But marginal and internal gap of two group were not differences statistically significant(p>0.05). Conclusion: Evaluation of marginal and internal gap of two group showed that no differences statistically significant and clinically acceptable results.

"서울, 경기 지역 치과경기소장의 전문대학 치기공과 출신 치기공사에 대한 만족도 조사" (A study on Satisfactory Degree of Dental Laboratory Heads about Dental Technician Who graduated form Junior college in Seoul and Kyoung Gi)

  • 민병국
    • 대한치과기공학회지
    • /
    • 제11권1호
    • /
    • pp.23-34
    • /
    • 1989
  • The great sudenn change of circle of dental laboratory technology brought mary discord between the new growing environmental group and the old group, In order to know the satisfactory degree of dental laboratory heads about all dental College, This Study was conducted for 49 detal technicians who graduated from junior laboratory heads in Seoul and Kyoung Gi area. The results are abtained as follow- 1. By age The degree of Satisfaction of items about all graduate dental technician were "41$\sim$45 age" group 26.53%), "46$\sim$50 age" group 22.45%, "36$\sim$40 age" group 18.36%, "31$\sim$35 age" group 12.24%, "51$\sim$55 age" group and "56$\sim$60 age" group 8.16% 60$\sim$age group 4.08% in order. 2. By Job Career. The Highest degree item out of Satisfaction about all graduated dental dental technician was 21$\sim$25 years group 28.5%, 16$\sim$20 years 20.4%, 11$\sim$15 years group 12.24%, 26$\sim$20%, 6$\sim$10 years group 4.08%, below 5 years group 2.04% in order. 3. By managing term of respondent's dental laboratory. The Satisfactory degree of items about all gradate technician were 7$\sim$10 years group 36.73% over 15 years group 22.45%, 11$\sim$14 years group 20.41%, 3$\sim$6 years group 14.29% below 2 years group 6.12% in order 4. By dental technician number of respondent's dental laboratory. The satisfactory degree intems about man were as follow; 6$\sim$9 persons group is 42.86 % The Satisfactory degree items about woman were one persons group in 34.69% 5. By born place The dental laboratory heads mean of inters about all dental technician were Seoul group 20.64 %, Kyoung Gi 17.20 %, Jen Nam group 14.99 % Chung Nam 9.5%in order 6. The satisfactory degree of items about all graduate dental technician were neither good nor bad group 32.65%, bad 6.12%, By ability of adaptaton, The satisfactory degree items about man were neither good nor bad group 42.86%, bad group 40.82%. The satisfactory degree of items about woman were neither good nor bad group 40.82% bad group 36.73%. 7. By sincerity. The satisfactory degree of items about man dental technician who graduated from Junior College were neither good nor bad group 52.02%, bad group 4.08, The satisfactory degree about woman dental technician graduated from Junior College were neither good nor bad group 42.86%, bad group 6.12%. 8. By ability of basical of items about man were bad group 40.82 %. The satisfactory degree about woman were 46.94%. 9. By cooperation relation ship. The satisfactory degree of items about man were neither good nor bad group 42.86%, bad group 10.20%. The satisfactory degree about woman were neither good nor bad group 42.86%, bad group 10.20 %. 10. By ability of work. The satisfactory degree of items about man were neither good nor bad group 48.98%, bad group 4.08%. The satisfactory degree about woman were neither good nor bad group 42.86%, bad group 6.12 %. 11. By the curriculum of the dental technician. The satisfactory degree of items about man were neither good nor bad group 67.35%, bad group 2.04%, The satisfactory degree about woman were neither good nor bad group 61.22%, bad group 6.12%. 12. By occupational satisfaction. The satisfactory degree of items about all graduate dental technician were fatisfied group 14.29%. By the out look of employment. The satisfactory degree of items about man greduate dental technician were neither good nor bad group 34.69 %, bad group 10.20%, about woman graduate dental technician were neither good nor bad group 44.90%, bad group 10.20%, Their employment prospect is not so bright or oprimistic due to the glut supply by graduates in the job-seeking market 13. The satisfactory rate on the artificial dental manufacturing world in terms of effects produced by juror College graduate dental technicians shared good group 40.82% bad group 2.04% 14. By cognition of the number of graduate dental technician. The satisfactory degree of dental laboratory heads about man graduate dental technician were too many group 38.78%, few group 6.12% about woman graduated dental technician were neither good nor bad group 30.6% few group 10,20%, The employment opportunities for the artifical dental technicians are getting decreased because of their excessive cumber in supply 15. The opinion regarding the initial salary. ranging from \160,000 to \200,000 for the junior college graduate dental technicians shared 57.14%. The top ratio, while the satisfaction reate on the academic study period of "3-year" group shared 22%, also the top ratio. 16. The improvement policy and prblematic issues presonted by the owner and operatore of atriticial dental manufacturing plants are as shown below First; The viewpoint that they contribute to the improvement of people's oral health in terms of their mission as artificial dental technicians. Second: The cultivation of basic technical ability to cope with clinical practice upon graduation Third; They require guidance in study and research in their filed of profession, that tray may beable to estaclish a from theory.

  • PDF

Biocompatibility study of lithium disilicate and zirconium oxide ceramics for esthetic dental abutments

  • Brunot-Gohin, Celine;Duval, Jean-Luc;Verbeke, Sandra;Belanger, Kayla;Pezron, Isabelle;Kugel, Gerard;Laurent-Maquin, Dominique;Gangloff, Sophie;Egles, Christophe
    • Journal of Periodontal and Implant Science
    • /
    • 제46권6호
    • /
    • pp.362-371
    • /
    • 2016
  • Purpose: The increasing demand for esthetically pleasing results has contributed to the use of ceramics for dental implant abutments. The aim of this study was to compare the biological response of epithelial tissue cultivated on lithium disilicate ($LS_2$) and zirconium oxide ($ZrO_2$) ceramics. Understanding the relevant physicochemical and mechanical properties of these ceramics will help identify the optimal material for facilitating gingival wound closure. Methods: Both biomaterials were prepared with 2 different surface treatments: raw and polished. Their physicochemical characteristics were analyzed by contact angle measurements, scanning white-light interferometry, and scanning electron microscopy. An organotypic culture was then performed using a chicken epithelium model to simulate peri-implant soft tissue. We measured the contact angle, hydrophobicity, and roughness of the materials as well as the tissue behavior at their surfaces (cell migration and cell adhesion). Results: The best cell migration was observed on $ZrO_2$ ceramic. Cell adhesion was also drastically lower on the polished $ZrO_2$ ceramic than on both the raw and polished $LS_2$. Evaluating various surface topographies of $LS_2$ showed that increasing surface roughness improved cell adhesion, leading to an increase of up to 13%. Conclusions: Our results demonstrate that a biomaterial, here $LS_2$, can be modified using simple surface changes in order to finely modulate soft tissue adhesion. Strong adhesion at the abutment associated with weak migration assists in gingival wound healing. On the same material, polishing can reduce cell adhesion without drastically modifying cell migration. A comparison of $LS_2$ and $ZrO_2$ ceramic showed that $LS_2$ was more conducive to creating varying tissue reactions. Our results can help dental surgeons to choose, especially for esthetic implant abutments, the most appropriate biomaterial as well as the most appropriate surface treatment to use in accordance with specific clinical dental applications.

도재소부용 금합금의 열처리에 따른 기계적 성질 및 미세조직 변화에 관한 연구 (A Study on Changes of Mechanical Properties and Microstructure in Porcelain Fused to Gold Alloys by Heat Treatment)

  • 남상용;곽동주;차성수
    • 대한치과기공학회지
    • /
    • 제31권4호
    • /
    • pp.9-15
    • /
    • 2009
  • The purpose of this study was to observe the change of mechanical property and microstructure in porcelain fused to gold alloy by heat treatment. PFG alloys are composed with Au-Pd-Ag alloy of the additional elements with indium, tin and copper. Specimens were tested in hardness using vicker,s micro-hardness tester and the surface micro structural changes were analysed by SEM and EDS. The results were as fellows: 1. The vickers hardness showed highest in Au-Pd-Ag alloy of the additional element with tin. 2. By hardening-oxiding result, the vicker,s hardness increased in additional element with tin but there was no significant difference in additional elements with indium and copper. 3. The surface oxide layer of Au-Pd-Ag alloy with added indium and tin increased but there was small change in additional element with copper. 4. The elements of indium and tin increased with increasing heat treatment in the surface alloy.

  • PDF

Inlay wax의 열팽창에 관한 연구 (A study on Thermal expansion of Inlay waxes)

  • 남상용;곽동주;차성수
    • 대한치과기공학회지
    • /
    • 제30권2호
    • /
    • pp.17-22
    • /
    • 2008
  • The purpose of this study was to observe the thermal expansion of the inlay waxes at temperature. Inlay pattern wax shows not only a high coefficient of expansion but also a tendency to warp or distort when allowed to stand unrestrained. The thermal expansion of inlay waxes was tested according to the treatment conditions for 10 minutes at $40^{\circ}C$ The thermal expansion of inlay waxes at various temperatures was measured with an electro dial gauge. The results were as fellows: 1. It is shown that the rate of thermal expansion of wax A is 0.2%, wax B is 0.29%, wax C is 0.38%, and wax D is 0.22% at $40^{\circ}C$ 2. It is shown that the coefficient of thermal expansion of wax A is $106{\times}10^{-6}/^{\circ}C$, wax B is $152{\times}10^{-6}/^{\circ}C$, wax C is $199{\times}10^{-6}/^{\circ}C$, and wax D is $116{\times}10^{-6}/^{\circ}C$ at $40^{\circ}C$ 3. The thermal expansion of the inlay waxes at $40^{\circ}C$ was shown to increase in the order of wax C, B, D, A.

  • PDF

치과 보철물 제작시 사용되는 Sprue의 재료 및 형태가 비귀금속 합금의 주조성에 미치는 영향에 관한 연구 (A Study on the Castability of Base Metal Alloys Which Sprue Shape and materials used in the Production of Dantal Prosdontics)

  • 최운재;신무학;김연수
    • 대한치과기공학회지
    • /
    • 제21권1호
    • /
    • pp.87-96
    • /
    • 1999
  • In order to examine the influence of sprue(used to make crown supplements) on casting, 3 kinds of sprue materials(wax, wood, plastic) and 3 types of sprue(round, square, triangle) were made and buried and cast, then the comparison and analysis of casting characters among sprue materials and among sprue type show the following results : 1. The comparison of casting characters in accordance with sprue materials shows wax sprue of 83.3%, wood sprue 81.3%, and plastic sprue of 80.7%, Wax sprue was the bast materials for casting, However there was no statistically significant difference of casting characters among was, plastic and wood. 2. The comparison of casting in accordance with sprue types shows square sprue of 94.0%, round sprue of 86.9% and triangle sprue of 84.2%. square sprue had a best casting character. 3. When a ring cast using wood sprue was classified from burying materials. its cutting of casting body and sprue indicated much more than any other sprue material. It seems to be caused by the influence of wood residuals and carbon occurrence.

  • PDF

의치 세정제가 의치상용 레진과 이장용 레진의 결합강도에 미치는 영향 (The effect of denture cleansers on the bond strength of reline resin to denture base resin)

  • 최에스더;한민수;권은자
    • 대한치과기공학회지
    • /
    • 제40권4호
    • /
    • pp.225-230
    • /
    • 2018
  • Purpose: The purpose of this study was to evaluate the effect of denture cleansers on the flexural bond strength of heat curing denture base resin and reliners. Methods: The denture base resin was bonded to the reliners(vertex self curing, kooliner, rebase II) to make the specimen. The specimens were immersed in denture cleansers(Polident, Cleadent) and evaluated after 1week, 3week, 5weeks. After denture reliners were injected, flexural bond strength was measured. Results: The bond strength of denture base resin and vertex self curing resin as reliner was significantly decreased at 5 weeks in cleadent and polident(p<0.05). The bond strength of kooliner and rebase II was significantly decreased at 5 weeks in denture cleaners(p<0.05). Kooliner was significantly decreased at 3 and 5 weeks in polident and rebase II was significantly decreased at 3 and 5 weeks in all denture cleansers(p<0.05). Conclusion : The flexural strength between the denture base resin and the reliners decreased significantly as the treatment time increased.