Comparison of dimensional accuracy between two commercially available light-activated and chemically activated acrylic resins for verification jigs in implant prosthodontics: An in vitro study

AIM: Verification jigs play a vital role in ensuring the passive fit of implant-supported prostheses by accurately transferring implant positions to the working cast. This in vitro study aimed to compare the dimensional accuracy of verification jigs fabricated using chemically polymerized (self-cure) and photopolymerized acrylic resin. SETTINGS AND DESIGN: In-vitro study design. MATERIALS AND METHODS: Sixteen three-dimensional-printed mandibular edentulous models with embedded implant analogs were used and divided into two groups (n = 8). Group A jigs were fabricated using self-cure resin (Pattern Resin™ LS, GC America), while Group B used light-cured resin (Resinlay®, TDV Dental, Brazil). All jigs were sectioned and relined to compensate for polymerization shrinkage before pouring the final working casts. The casts were scanned using a desktop optical scanner, and standard tessellation language (STL) files were superimposed onto a reference model using Geomagic Control X software. Root mean square (RMS) deviation, linear inter-implant distance deviation, and angular deviation were calculated. STATISTICAL ANALYSIS USED: Statistical comparisons were made using an independent t-test. RESULTS: Group A and Group B demonstrated comparable RMS deviation (0.057 ± 0.003 mm vs. 0.060 ± 0.003 mm; P = 0.170), linear deviation (0.084 ± 0.003 mm vs. 0.090 ± 0.002 mm; P = 0.270), and angular deviation (1.855° ± 0.023° vs. 1.965° ± 0.061°; P = 0.148). None of the differences were statistically significant. CONCLUSION: Both groups provide clinically acceptable dimensional accuracy in verification jig fabrication. Resinlay, with its superior handling and reduced working time, may serve as an efficient alternative in clinical settings.