The evaluation of four different laminate veneer restorative materials in terms of microleakage

The purpose of Restorative Dentistry is giving the appearance of natural teeth again together with function and phonation after the correct diagnosis and an absolute treatment.Composite resins and dental porcelains are the most common materials used for laminate veneer technique. However, direct composite resin restorations have disadvantages because of marginal leakage restoration as a result of polymerization shrinkage.In this study, gingival and occlusal microleakage amounts of four different laminate veneer restoration materials are assessed comparatively. Sixteen freshly extracted, caries and restoration free, including no cracks anterior teeth were used in this in vitro study.Standard chamfer cavity preparations were done which; at the labial surface 0.5 milimeter, at the mesial and distal contact points 0.2 milimeter and at the gingival step 0.3 milimeter depth for all teeth. At the end of the cavity preparations, 60 anterior teeth were randomly divided into four groups (n:15). Then Valux Plus in Group I, Herculite XRV in Group II, Admira in Group III, and Tetric Ceram in Group IV were applied to prepared cavities according to manufacturers? recommandations, and were polymerized by light curing.All teeth, except 1.5-2 milimeter lower-level of the restorations, were coated twice with varnish and stained in 2 % basic fuchsin for 24 h. Teeth were taken from dye solution and then were embedded in paraffin blocks, sectioned bucco-palatinally through the middle of the restorations and than assessed for measuring linear dye penetration depths under the microscope.Incisal and gingival dye penetration amounts of Tetric Ceram samples were found significantly lower than other 3 groups (P<0,05).