Journal of Dental Rehabilitation and Applied Science (구강회복응용과학지)

Korean Academy of Stomatognathic Function and Occlusion (대한턱관절교합학회)
권호 표지

Flexure Strength of Various Colored and Uncolored Zirconia Ceramics for All-Ceramic Restoration

전부도재수복물을 위한 유색 및 무색 지르코니아 세라믹의 굴곡강도

  • Oh, Sang-Chun (Department of Prosthodontics, College of Dentistry, Wonkwang University) ;
  • Lee, Hae-Hyoung (Dept. of Biomaterials, College of Dentistry, Dankook University) ;
  • Shin, Mee-Ran (Department of Prosthodontics, College of Dentistry, Wonkwang University) ;
  • Lee, Il-Kwon (Department of Prosthodontics, College of Dentistry, Wonkwang University)
  • 오상천 (원광대학교 치과대학 보철학교실) ;
  • 이해형 (단국대학교 치과대학 생체재료학교실) ;
  • 신미란 (원광대학교 치과대학 보철학교실) ;
  • 이일권 (원광대학교 치과대학 보철학교실)
  • Published : 2007.06.30
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Abstract

Purpose: This investigation was designed to estimate the flexure strength, density, and microstructure of the colored and uncolored zirconia oxide ceramics for fixed partial denture. Material and Methods: LAVATM All Ceramic(3M-ESPE, USA), Cercon Smart Ceramic(Dentsply, USA), and Z-match Ceramic(DentAim, Korea) were used for this study. All specimen was fabricated by ASTM C1161. After preparing $25{\times}2{\times}1.5mm$ of rectangular column and sitting rectangular column on universal test machine (UTM), external supporting point distance is 20.0 mm, internal supporting point distance is 10.0 mm. Specimen was loaded with 0.2 mm/min of cross head speed until fracture and at the time of broken of specimen, measuring loading value with PC software. Results: The results were obtained as follows: 1. Flexure strength of uncolored zirconia was higher than that of colored zirconia. 2. In uncolored zirconia, flexure strength of LAVATM Ceramic was more higher than the other ceramics, and it showed statistical difference between LAVATM Ceramic and Cercon Smart Ceramic (P<0.05). 3. In colored zirconia, flexure strength of LAVATM Ceramic was more higher than the other ceramics too, but they did not show statistical difference (p>0.05). 4. In Weibull analysis, Characterastic strength was showed highest value to uncolored LAVATM Ceramic and lowest value to Z-match ceramic, and Weibull modulus(m) of uncolored zirconia was higher than that of colored zirconia. 5. In XRD analysis, all group except Z-match showed high peak of t-ZrO2 but they did not show m-ZrO2. Colored zirconia group showed lower peak of t-ZrO2 than that of uncolored zirconia group.

Keywords

Acknowledgement

Supported by : 원광대학교

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