Fracture Resistance of Monolithic Zirconia Crowns Depending on Different Marginal Thicknesses
- 주제(키워드) marginal thickness , marginal width , monolithic zirconia , fracture resistance
- 주제(기타) Chemistry, Physical
- 주제(기타) Materials Science, Multidisciplinary
- 주제(기타) Metallurgy & Metallurgical Engineering
- 주제(기타) Physics, Applied
- 주제(기타) Physics, Condensed Matter
- 설명문(일반) [Kim, Seung-Han; Choi, Sun-Young; Park, Eun-Jin] Ewha Womans Univ, Sch Med, Dept Prosthodont, Seoul 07985, South Korea; [Yeo, Mi-Yeon] Ewha Womans Univ, Grad Sch Clin Dent, Seoul 07985, South Korea
- 등재 SCIE, SCOPUS
- OA유형 gold, Green Published
- 발행기관 MDPI
- 발행년도 2022
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000194606
- 본문언어 영어
- Published As https://doi.org/10.3390/ma15144861
- PubMed https://pubmed.ncbi.nlm.nih.gov/35888327
초록/요약
Under some clinical conditions, the preparation of crowns of limited marginal thickness is inevitable. In such situations, it is questionable whether the same ideal preparation criteria can be applied equally. Since there are only a small number of studies focusing on the fracture resistance with respect to the marginal thickness, there is a need for a study evaluating whether zirconia crowns of limited marginal thickness are clinically acceptable. The purpose of this study is to evaluate the fracture resistance of monolithic zirconia crowns of limited marginal thickness in the posterior area. Methods: Abutments and CAD/CAM zirconia crowns with a marginal thickness of 1.0 mm were set as the control group, while experimental groups A, B, and C possessed reduced marginal thicknesses of 0.8 mm, 0.6 mm, and 0.4 mm, respectively (n = 10 per group). Resin-based abutment dies and monolithic zirconia crowns were fabricated using the CAD/CAM technique, and a universal testing machine was used to measure the fracture load value. Fractured specimens were examined with a scanning electron microscope. The data were analyzed using a one-way ANOVA and Bonferroni post hoc test (p < 0.05). Results: The means and standard deviations of the fracture load values of the control group and the three experimental groups were as follows: control group (1.0 mm): 3090.91 +/- 527.77 N; group A (0.8 mm): 2645.39 +/- 329.21 N; group B (0.6 mm): 2256.85 +/- 454.15 N; group C (0.4 mm): 1957.8 +/- 522.14 N. Conclusions: The crowns fabricated with a CAD/CAM zirconia block with limited marginal thicknesses of 0.6 mm and 0.4 mm showed significantly lower fracture resistance values compared to those with the recommended margin thickness of 1.0 mm.
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