Effect of different palatal vault shapes rey, UK) was prepared according to the recom- bers (Vetrolex RC, 14-800-P109, Ciba Composites, mendations of the manufacturer. The prepared Birmingham, UK) were shaped with a lancet as to acrylic resin dough was allowed to set for 20 min provide 2 mm shorter borders than the boundar- and was packed into the flasks with finger pres- ies of acrylic resin bases. Heat polymerized acrylic sure. Following trial closures for removing excess resin denture base material (QC-20, Dentsply Int resin, the flasks were closed, pressed in a hydrau- Inc, Waybridge, Surrey, UK) was prepared accord- lic pressing apparatus (KaVo Elektrotechnisches, ing to the recommendations of the manufacturer. D-7970, Werk Germany) under a pressure of 100 To provide accurate penetration and integration, bars and heated for 30 minutes at 75°C and an ad- shaped glass fibers were dipped in monomer for ditional 30 minutes at 100°C. 15 min before being introduced into the acrylic resin bulk. A thin layer of acrylic resin dough was Preparation of specimens reinforced with first placed on the cast surfaces inside the flask woven type glass fibers and prepared woven fibers were placed on the ini- For specimen preparation of groups ROUND- tially placed acrylic layer. A second thin layer of ED/WOF, U/WOF and V/WOF, woven type glass fi- acrylic resin dough was placed on the woven fiber Figure 1. Definitive casts obtained from different palatal vault rounded (V: A, Uium: B, rounded: C), and fiber reinforced acrylic resin bases. The arrows demonstrate marked reference points (A, B, C, D). 72 European Journal of Dentistry