Evaluation of the Accuracy of Three Different Materials Used to Fabricate Dental Implant Verification Jigs.
Abstract: Aim & Hypothesis: The accuracy of transferring dental implant position from the patient's mouth to the master cast is important to achieve long-term successful treatment. All implant-supported prosthesis casts need to be verified before fabrication of the framework. The primary aim of this study was to assess different materials in terms of their performance in transferring the implant p... read moreosition by comparing the dimensional accuracy of test casts fabricated by using verification jigs made of GC resin, test casts fabricated by using verification jigs made of Triad light cure resin, and test casts fabricated by using verification jigs made of Fixpeed resin with the control cast. The secondary aim was to compare the accuracy of test casts fabricated by using parallel and angulated implants within each material (within each group). The hypotheses were that the test casts fabricated by using Triad light cure verification jigs would be more accurate than the test casts fabricated by using Fixpeed resin verification jigs and the test casts fabricated by using GC resin verification jigs and that parallel implants would have more 3-dimensional accuracy than angulated implants. Materials & Methods: A PMMA blank representing an edentulous mandibular arch was prepared, and 5 internal connection implants (Straumann Tissue Level RN, Basel, Switzerland) were placed. The implant distribution included three implants in the anterior region, and two implants in the posterior region. The three implants in the anterior region were parallel to each other and the two implants in the posterior region were distally tilted bilaterally 20 degrees. Verification jigs were fabricated with three different materials by using prefabricated bars, representing three different groups. Every group included 15 specimens. These 45 verification jigs were fabricated from the master model to make 45 verification jig casts (test casts) using low expansion type IV (Resin Rock) stone for three different groups of 15 specimens each (n=15). Distortion was recorded as root mean square. Results: After comparing the three groups in this study the results were: Group 1 (GC Resin) had a mean (SD) value of 36.59 (12.47) μm; Group 2 (Fixpeed Resin) had a mean (SD) value of 35.9 (10.13) μm; Group 3 (Triad Gel) had a mean (SD) of 34.12 (7.10) μm. One-way ANOVA showed no statistically significant difference between groups (P=0.790). For the second analysis, which was the comparison of parallel and tilted implants within each group (GC Resin, Fixpeed Resin, and Triad Gel), Group 1 (GC Resin) parallel had a mean (SD) value of 35.65 (12.30) μm; tilted had a mean value of 38.00 (13.02) μm. In Group 2 (Fixpeed Resin), parallel had a mean (SD) value of 33.85 (8.77) μm; tilted had a mean of 39.05 (12.62) μm. In Group 3 (Triad Gel), parallel had a mean (SD) value of 33.28 (7.47) μm; tilted had a mean (SD) value of 36.03 (7.12) μm. 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 was significant for all three groups: GC Resin (P=0.024; paired ttest), Fixpeed Resin (P=0.002; Wilcoxon signed-rank test), and Triad Gel (P=0.002; paired t-test). Conclusions: There were no statistically significant differences between the three materials in regards to the 3-D distortions of the test casts fabricated by using GC Resin, Fixpeed Resin, and Triad Gel verification jigs. The 3-D distortion value in comparison between parallel vs. tilted implants showed that parallel implants had significantly less 3-D distortion compared to 20 degrees tilted implants.
Thesis (M.S.)--Tufts University, 2015.
Submitted to the Dept. of Posthodontics.
Advisor: Panos Papaspyridakos.
Committee: Hans Weber, Yong-jeong Kim, Khaled El Rafie, and Matthew Finkelman.
Keyword: Dentistry.read less