Influencia del diseño del muñón y el método de escaneado en el ajuste marginal de estructuras elaboradas con el sistema Cercon Smart Ceramics®

Abstract

Introduction: Today CAD/CAM systems are a common option as contrasted with conventional laboratory methods. Accuracy and precision of these methods are essential to obtain well fitted crowns. This is basic for long-term success in fixed prosthesis. The aim of this study is to evaluate the influence of scanning method and tooth preparation design on marginal adaptation of Cercon Smart Ceramics® restorations. Material and Method: Twenty stainless steel dies were made with different oclusal convergence angles (10º and 15º). Over these dies twenty crowns were fabricated with Cercon Smart Ceramics® system. The system’s laser scanned the wax-up of half of the crowns, and it scanned directly the preparation of the half rest. After cementing the crowns, marginal fitting will be analyzed using an electron microscope. Results: Statistically differences were found (p≤0.05) between marginal fitting of computer designed crowns (67.35 µm) and crowns whose wax-up was scanned (99.34 µm). There aren’t statistically differences between crown’s adaptation over 10º and 15º teeth. Conclusions: In Cercon Smart Ceramics® system, preparation scanning gets better marginal fitted crowns than wax-up scanning. Convergence angle doesn’t influence marginal adaptation.