The Journal of Korean Academy of Prosthodontics (대한치과보철학회지)

The Korean Academy of Prosthodonitics (대한치과보철학회)
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Effect of different pattern size and pattern shape on castability of commercially pure titanium

납형의 크기와 형태가 티타늄의 주조성에 미치는 영향

  • Seo, Yoon-Jeong (Department of Prosthodontics, Dental Science Research Institute, School of Dentistry, Chonnam National University) ;
  • Oh, Gye-Jeong (RIS Foundation for Advanced Biomaterials, Dental Science Research Institute, School of Dentistry, Chonnam National University) ;
  • Lee, Hyo-Il (Department of Prosthodontics, Dental Science Research Institute, School of Dentistry, Chonnam National University) ;
  • Shin, Yoo-Jin (Department of Prosthodontics, Dental Science Research Institute, School of Dentistry, Chonnam National University) ;
  • Kim, Hong-Joo (Prosthodontic Clinic, Daejeon Sun Dental Hospital) ;
  • Park, Sang-Won (Department of Prosthodontics, Dental Science Research Institute, School of Dentistry, Chonnam National University)
  • 서윤정 (전남대학교 치의학전문대학원 보철학교실) ;
  • 오계정 (전남대학교 미래형생체부품소재 RIS사업단) ;
  • 이효일 (전남대학교 치의학전문대학원 보철학교실) ;
  • 신유진 (전남대학교 치의학전문대학원 보철학교실) ;
  • 김홍주 (대전 선치과병원 보철센터) ;
  • 박상원 (전남대학교 치의학전문대학원 보철학교실)
  • Received : 2013.08.08
  • Accepted : 2013.09.16
  • Published : 2013.10.31
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Abstract

Purpose: The purpose of this study was to investigate the effect of geometrically different wax pattern shapes and sizes on the castability of Grade2 Cp-Ti (commercially pure titanium). Materials and methods: Total of 40 mesh wax pattern ($61mm{\times}24mm$, 207 grids), ($61mm{\times}17mm$, 138 grids) was cast in this experiment. Depending on the geometrical shape of the wax pattern, 8 groups was organized; Flat, Semicircular, Horse-shoe and V-shape, each consisting 5 samples. Runner-bar sprue was used in all patterns. The number of completely cast grid in wax pattern served as a measure for the castability of comercially pure titanium. Results: The mean value of square count in each group was as followed; 133.20 squares in group SS (96.52%), 132.40 squares in group SH (95.94%), 132.00 squares in group SF (95.65%), 127.60 squares in SV (91.43%), 198.60 squares in group LF (95.94%), 197.80 squares in group LV (95.56%), 196.40 squares in group LS (94.88%), and 188.00 squares in group LH (90.82%). Conclusion: Within the limitations of this study the results indicate that there were no sttistically significant difference in castability of titanium regarding wax pattern shape (P>.05). However, Small size wax patterns were showing the noticeable castability more than Large size pattern.

연구 목적: 본 연구는 납형의 크기 및 형태 변화가 티타늄의 주조성에 어떠한 영향을 미치는지 확인하고자 하였다. 연구 재료 및 방법: 납형의 크기에 따라 Small Pattern군과 Large Pattern군으로 나누었고, 각각 Flat, Semicircular, Horse-shoe 및 V-shape형으로 납형의 형태에 따라 4개의 하위군으로 나누어 총 8개의 군으로 분류하였다. 모든 납형의 주입선은 Runner-bar형으로 하였다. 티타늄 주조 전용 매몰재인 실리카계 매몰재(Rematitan Plus$^{(R)}$, Dentarum, Germany)를 이용하여 매몰하였고, 아크용융 방식의 원심 주조기(Ti Cast Super R$^{(R)}$, Selec, Japan)를 사용하여 주조하였다. 주조성 평가는 완전한 형태로 주조 된 격자의 개수를 척도로 재현 정도를 확인하였다. 통계처리는 SPSS ver. 19.0 for WIN (SPSS. Inc. Chicago, IL, USA)를 사용하였다. 납형의 크기 및 형태에 따른 티타늄의 주조성을 이원변량 분산분석(Two-way ANOVA)을 이용하여 분석하였다. 결과:납형의 평균 재현율은 Small Pattern군은 95.14%, Large Pattern군은 94.30%로 Small Pattern군의 주조성이 유의하게 높았다(P<.05). 납형의 형태 변화에 따른 주조성은 Small Pattern군에서 Semicircular군 133.20개(96.52%), Horse-shoe군 132.40개(95.94%), Flat군 132.00개(95.65%), V-shape군 127.60개(92.46%) 순으로 감소하였다. Large Pattern군은 Flat군 198.60개(95.94%), V-shape군 197.80개(95.56%), Semicircular군 196.40개(94.88%), Horse-shoe군 188.00개(90.82%)순으로 감소하였다. Small Pattern군과 Large Pattern군 모두에서 납형의 형태변화에 따른 주조성은 유의할 만한 차이를 보이지 않았다(P>.05). 결론:주조체의 크기가 작을수록 주조성이 높아짐을 알 수 있었고 형태에 따른 주조성에서는 큰 영향을 받지 않는 것을 알 수 있었다.

Keywords

References

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