Marginal Adaptation and Fracture Resistance of Resin Nano-Ceramic and Zirconium Dioxide All Ceramic Restorations

Marginal adaptation is one of most important criteria for long term clinical success of dental restorations [1]. The presence of marginal discrepancies exposes the luting agent to the oral environment. The larger the marginal discrepancy and the subsequent exposure of the dental luting agent to oral fluids, the more rapid the rate of cement dissolution and microleakage [2]. These marginal irregularities facilitate the adherence of oral bacteria along with percolation of food, oral debris and other substances to finally cause plaque retention, which in turn causes changes in the distribution of the subgingival microflora, thereby leading to periodontal disease [3] and secondary caries [4].