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題 名 | Influence of Thermal Aging on the Marginal Integrity of Computer Aided Design/Computer Aided Manufacturing Fabricated Crowns |
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作 者 | Lopez, Diana; Ziada, Hassan; Abubakr, Neamat Hassan; | 書刊名 | Journal of Dental Sciences |
卷 期 | 19:2 2024.04[民113.04] |
頁 次 | 頁971-977 |
分類號 | 416.964 |
關鍵詞 | CAD/CAM crowns; Marginal integrity; Lithium discilicate glass-ceramics; Lithium-reinforced glass-ceramics; |
語 文 | 英文(English) |
DOI | 10.1016/j.jds.2023.07.009 |
英文摘要 | Background/purpose The adaptation and marginal integrity of computer-aided designed and computer-aided manufactured (CAD/CAM) crowns after exposure to thermal aging need to be investigated. The present in-vitro study was designed to investigate the marginal integrity of CAD/CAM fabricated crowns cemented on extracted teeth after thermocycling aging. Materials and methods Twenty-six newly extracted human premolars were prepared for full-coverage CAD/CAM crowns and were divided into two groups (leucite-reinforced glass-ceramics and lithium disilicate glass-ceramics). Both crowns’ groups were cemented using dual curing resin cement. All specimen margins were measured for marginal integrity using an imaging system 24 h post cementation; then after 1, 3, and 5 estimated clinical years (10,000, 30,000, and 50,000 thermocycles). Two-way ANOVA analysis were used to determine whether the mean value difference is significantly different (ɑ = 0.05). Results The average margin gaps recorded for leucite-reinforced glass-ceramic crowns were: 82.61 μm initial, and 91.02 μm after 5 estimated clinical year). For the lithium disilicate glass-ceramic crowns, the average margin gaps recorded were: 100.01 μm initial, and 120.21 μm after 5 estimated clinical year. During all measuring intervals, the leucite-reinforced glass-ceramic crown group had a lower marginal discrepancy. No statistically significant difference between the two groups was recorded. Conclusion After being subjected to thermocycling, both CAD/CAM ceramic crowns, exhibited an increase in their marginal discrepancy; the difference was within the accepted clinical range. |
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