Comparative evaluation of marginal accuracy of different provisional restorative materials fabricated by direct technique: An in vitro study

Objective: The most essential requirement of a provisional crown is an adequate marginal fit which is necessary for maintaining optimal periodontal health and protect the tooth from physical, chemical, thermal, and bacterial injuries. The purpose of this in vitro study was to evaluate and compare the vertical marginal accuracy of provisional crown materials using four different material systems (Autopolymerized PMMA powder-liquid system, light-activated UD single paste system, chemically activated Bis-GMA two paste auto mix system and dual cure polymerized resin two paste auto mix system) using a direct technique. Materials and Methods: Two customized stainless-steel dies, simulating prepared and unprepared tooth were used to fabricated a total no. of 48 provisional crowns. A vacuum-formed polypropylene sheet was used as a matrix. Twelve crowns, each of the four material systems used in the study (n = 12 × 4) were fabricated using the direct technique. The vertical marginal accuracy was analyzed by using stereomicroscope 20X magnification at four different points.&nbsp