Marginal adaptation of three different zirconium dioxide three-unit fixed dental prostheses

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• 作者：Wael Att ; Futoshi Komine ; Thomas Gerds ; Jö ; rg Rudolf Strub
• 刊名：The Journal of Prosthetic Dentistry
• 出版年：2009
• 出版时间：April 2009
• 年：2009
• 卷：101
• 期：4
• 页码：239-247
• 全文大小：547 K

文摘

Statement of problem

Marginal adaptation is important for the long-term success of dental restorations. Data on the marginal discrepancy of zirconia-based fixed dental prostheses made with different computer-aided design/computer-aided manufacturing technology is needed.

Purpose

The purpose of this study was to evaluate the marginal adaptation of different zirconia 3-unit fixed dental prostheses at different fabrication stages and after artificial aging.

Material and methods

Twenty-four zirconia 3-unit fixed dental prostheses (DCS, Procera, and VITA YZ-Cerec; n=8) were fabricated using different manufacturing systems and conventionally cemented with glass ionomer cement on human teeth. Each group was aged in a masticatory simulator with thermal cycling. The marginal gaps were examined on epoxy replicas for frameworks and for restorations before and after cementation, and after masticatory simulation, at ×250 magnification. Marginal adaptation was assessed using geometric means of the marginal gap values with 95 % confidence intervals. Differences between the manufacturing systems and the effect of artificial aging were tested using repeated-measures ANOVA and post hoc paired and unpaired t tests with Bonferroni-Holm correction (α=.05).

Results

The geometric mean (95 % confidence limits) marginal gap values (μm) for frameworks and for restorations before cementation, after cementation, and after masticatory simulation were, respectively: DCS: 86 (80-93), 86 (83-90), 86 (78-94), and 84 (79-90); Procera: 82 (74-89), 89 (81-97), 89 (84-95), and 88 (82-94); and VITA YZ-Cerec: 64 (57-72), 67 (61-77), 76 (71-82), and 78 (76-80). The repeated-measures ANOVA showed significant group and stage effects (P<.05). Group VITA YZ-Cerec showed significantly smaller marginal gap values than groups DCS and Procera at framework (P<.05) and before-cementation (P<.05) stages. The VITA YZ-Cerec group showed significantly smaller marginal gap values than the Procera group after cementation (P<.05). The marginal gap values between different stages were not significantly different for all groups (P>.05).

Conclusions

The marginal accuracy of zirconia fixed dental prostheses is influenced by manufacturing technique. (J Prosthet Dent 2009;101:239-247)