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摘要
PurposeThe primary aim of this study was to assess the accuracy of different splinting materials to make implant cast verification jigs. The secondary aim was to assess the effect of 20 degrees implant angulation on the accuracy of casts. Materials and MethodsAn edentulous mandibular arch with five internal connection tissue level implants served as control. The three implants in the anterior region were parallel to each other and the two implants in the posterior region were distally tilted 20 degrees bilaterally. Verification jigs were fabricated with three different materials by splinting prefabricated bars to temporary abutments, resulting in three different groups (n=15 specimens). Test casts were fabricated with low expansion type IV stone, and subsequently digitized with reference scanner. The STL files from the test casts and the control were superimposed, in order to determine the three-dimensional (3D) deviations. ResultsGroup 1 (GC Pattern Resin) had a mean (SD) value of 36.59 (12.47) m; Group 2 (Fixpeed Resin) had a mean (SD) value of 35.9 (10.13) m; and Group 3 (Triad Gel) had a mean (SD) of 34.12 (7.10) m. One-way ANOVA showed no statistically significant difference between groups (p=0.790). For the comparative analysis of the effect of implant angulation, data were normally distributed for Groups 1 and 3 (GC Resin and Triad Gel), but not for group 2 (Fixpeed Resin). The difference between parallel and tilted implants was significant for all three groups: GC Resin (p=0.024; paired t-test), Fixpeed Resin (p=0.002; Wilcoxon signed-rank test), and Triad Gel (p=0.002; paired t-test). ConclusionsThere were no statistically significant differences between the 3D deviations of the test casts fabricated from verification jigs made by three materials (GC Pattern Resin, Fixpeed Resin, and Triad Gel). Parallel implants had nominally significantly less 3D deviations compared with 20 degrees distally tilted implants, but not clinically significant. Clinical SignificanceThe results of the present study indicate that more than 20 degrees of angulation, has an effect on the 3D accuracy. However, even though the tilted implants had nominally significantly more 3D deviation, it was not clinically significant. The clinical implications of this in vitro study are relevant to the popular full-arch implant rehabilitation concept of tilted and axial implants such as the All-on-four concept. Tilting the posterior implants to increase the antero-posterior spread increases the implant angulation which is then corrected with 30 degrees angulated abutments. This in vitro study shows that even after correction with angulated abutments if the remaining angulation is up to 20 degrees, framework fit may still be achieved. Verification jig is essential tool to achieve the framework fit. (J Esthet Restor Dent 29:102-109, 2017)
- 出版日期2017-3
