The Effect of Various Splinting Materials on the Accuracy of Implant Impressions: An In Vitro Study
Meet A Dodia, Sanjay B Lagdive, Rupal J Shah, Nilesh N Patel
Dental Implants, Implant Impression, Open tray impression, Splinting
Citation Information :
Dodia MA, Lagdive SB, Shah RJ, Patel NN. The Effect of Various Splinting Materials on the Accuracy of Implant Impressions: An In Vitro Study. Int J Prosthodont Restor Dent 2022; 12 (1):16-24.
Purpose: The purpose of the present study was the comparative evaluation of the positional accuracy of different types of splinting materials used in implant impressions with the open tray technique.
Materials and methods: A clear heat cure acrylic resin mandibular master reference model was used with four implants in positions A, B, D, and E. Open tray direct impression copings were fastened to the implants and splinted using different materials: bite registration paste, composite resin, pattern resin bars, and photopolymerized resin. One-step putty wash impression was made in a custom-made open tray, and the cast was poured. Healing abutments were attached to the implants in master reference model and to the lab analogs in sample casts and analyzed using a coordinate measuring machine (CMM) for comparison. Descriptive statistics were done. Shapiro–Wilk test was done to check the normality, followed by parametric tests for comparisons. Intergroup comparison was performed using one-way analysis of variance (ANOVA), after which pair-wise comparison was made using Games-Howell post-hoc test.
Results: Open tray impression copings splinted with materials of all four groups showed minimal variation in positions of multiple implants. Photopolymerized acrylic resin showed the least deviation from a master model for three-dimensional (3D) distance between implants 1 and 2 (3D_1_2), with a mean difference of 0.058 (p = 0.629); and also, between implants 1 and 4 viz 3D_1_4, the difference was least for photopolymerized resin to be 0.007 (p = 0.993). For distance 3D_1_3, there was least deviation of 0.102 (p = 0.001) for bite registration paste. Thus, photopolymerized resin followed by bite registration paste and nanocomposite resin performed comparable to and better than pattern resin blocks in the present study.
Conclusion: Photopolymerized resin can be considered a promising and effective splinting material, saving clinical time and enhancing patient acceptance. It also eliminates the need for splinting, sectioning, and resplinting necessary in conventionally used pattern resin techniques.
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