Accuracy Assessment of direct and indirect techniques used in fabrication of custom metal posts and cores patterns (In vitro study)

Abstract

Background and Aim of study: Patterns for custom made cast posts and cores can be fabricated either by direct or indirect technique. Previous studies reported controversy results regarding the best technique. Hence, our study aimed to investigate the effect of pattern fabrication technique on post adaptation.

Materials and Methods: single-canal freshly extracted human premolars (n=12) were endodontically treated and their canals were prepared to receive custom made posts and cores. Two patterns were fabricated for each tooth, one using direct technique and one using indirect technique. Patterns were then cast and posts adaptation in both groups were evaluated by weighting the silicon wash trapped between the post and canal walls using a precision digital scale (0.0001g). The apical gap of each post in both groups was defined with parallel digital radiography. Data were collected and analyzed using T-student test.

Results: direct technique used in posts patterns fabrication provide posts with significantly better adaptation than indirect one (P < 0.05).

Conclusions: According to this study, it was found that post pattern fabrication technique influenced post adaptation.

Keywords: Custom Made Posts And Cores, Direct Patterns, Indirect Patterns, Post Adaptation.