TY - JOUR ID - TI - The Influence of Different Fabrication Techniques and Preparation Designs on the Marginal Adaptation of Ceramic Veneers (An In vitro Comparative Study) AU - Bashaer Abd El-Sahib Najim بشائر عبد الصاحب نجم AU - Inas I. Al-Rawi PY - 2015 VL - 27 IS - 4 SP - 8 EP - 14 JO - Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد SN - 18171869 23115270 AB - Background: Ceramic veneers represent the treatment of choice in minimally invasive esthetic dentistry; one of thecritical factors in their long term success is marginal adaptation. The aim of the present study is to evaluate themarginal gap of ceramic veneers by using two different fabrication techniques and two different designs ofpreparation.Material and methods: A typodont maxillary central incisor used in the preparation from which metal dies werefabricated, which were in turn used to make forty stone dies. The dies divided into four experimental groups, eachgroup had ten samples: A1: prepared with butt-joint incisal reduction and restored with IPS e.max CAD, A2: preparedwith overlapped incisal reduction and restored with IPS e.max CAD. B1: prepared with butt-joint incisal reductionrestored with IPS e.max press. B2: prepared with overlapped incisal reduction and restored with IPS e.max press. Themarginal gap was measured with direct view technique using digital microscope at a magnification of 230x.Measurements were recorded for four surfaces for each sample and the maximum value was taken to represent thatsample.Results: The data were analyzed with two-way ANOVA and independent samples t-tests. These tests revealed highlysignificant effects of both the preparation design and the technique of fabrication on the marginal gap (p=0.00),with CAD/CAM veneers, group A1 recorded the least marginal gap and pressing group, B2 showed the highest gapvalues. There was no significant effect of the interaction between the two parameters on the marginal gap.Conclusion: the CAD/CAM veneers with butt joint incisal reduction produced the most accurate margins while theleast favorable combination was the pressable ceramic veneers with overlapped incisal reduction

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