Abstract
The goal of this study was to evaluate the effect of using die spacers on the marginal fit of NiCr (M1) and NiCrBe (M2) alloys and commercially pure titanium (cpTi) (M3) copings cast by the lost wax technique. Using a metal matrix, 45 resin added extra hard type IV stone models were obtained for the fabrication of wax patterns under the following conditions: no die spacer (A), with one die spacer layer (B) and with two die spacer layers (C), with five repetitions for each condition (alloy x die). Each die was waxed and the wax patterns were invested as per manufacturer's instructions. Three wax patterns were embedded in each casting ring, each corresponding to one of the conditions. Each coping, seated to the metal matrix by a seating pressure standardizing device (SPSD), was taken to an optical microscope for measurement of marginal discrepancy. The obtained data (microm) were analyzed statistically by ANOVA and Tukey' test (a=5%). There was statistically significant difference (p<0.05) among the materials (M1=110.67; M2=130.33 and M3=148.33). Regarding the use of the die spacer, there was a statistically significant difference (p<0.05) among the three conditions (A=162.00; B=131.06 and C=96.67). It was concluded that there is less marginal discrepancy with two die spacer layers.
Highlights
Over the past decades, the search for dental materials of good quality and safe to patient’s health has increased significantly
The purpose of this study was to evaluate the effect of using die spacers on the marginal fit of metal copings cast in commercially pure titanium (cpTi) by the lost wax technique, in comparison to two alloy formulations commonly used in dentistry: NiCr and NiCrBe
The original data of this study resulted from the factorial product of 3 treatments, 3 metal alloys (Verabond, Verabond 2, and cpTi), 4 reference points
Summary
The search for dental materials of good quality and safe to patient’s health has increased significantly. Alloys referred to as alternative, on the other hand, still face some resistance from prosthodontists. In spite of their lower cost, these alloys do not offer the proper biosafety for clinical use, as their formulation contains metals such as nickel and beryllium [1]. Namely dental prosthodontics, among the several available formulations, NiCr and CoCr alloys are still the ones that cause less clinical inconveniences, due to their high corrosion resistance in the oral environment, in addition to other physical and mechanical properties that make these alloys more appropriate structural materials than gold alloys [4]. Titanium and its alloys have been studied as alternatives to alloys commonly used in fixed and removable prostheses because of characteristics such as biocompatibility, high mechanical strength and satis-
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