Oral Health and Dental Management

Abstract

The Effect of Pattern Materials on the Marginal Gap of Metal Copings Fabricated On Titanium Implant Abutments

Amir Ali Reza Khaledi, Mitra Farzin, Amir Hassain Fathi, Soheil Pardis

Aims: This study was aimed to compare the effect of three different pattern materials on the vertical marginal discrepancy of Nickel-Chromium copings fabricated on titanium implant abutments. Methods: A titanium implant abutment was used to receive 30 Nickel-Chromium copings. The copings were constructed using pattern wax (group 1), acrylic pattern resin (group 2), and lightcured pattern resin (group 3). The marginal gap of the Nickel-Chromium copings was measured at 4 points on the abutmentimplant assembly by using a digital microscope. One-way ANOVA and post hoc tests were adopted for statistical analysis (α=0.05). Results: The mean marginal gap values of Nickel-Chromium copings fabricated from pattern wax, acrylic pattern resin, and lightcured pattern resin were 34.00, 31.78 and 25.87 μm, respectively. There was a statistically significant difference between groups 1 and 3 (p=0.02), whilst the difference between groups 2 and 3 and between groups 1 and 2 was not statistically significant (p>0.05). Conclusions: The marginal gaps of the copings, fabricated from tested pattern materials, were within the clinically acceptable range. Nevertheless, light-cure pattern resin had a better vertical marginal fit than acrylic pattern resin and pattern wax.