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甲冠适合性一般认为是存在于预备牙与修复体组织面间的间隙,大的边缘间隙,菌斑在近龈缘处聚积而增加了继发龋和牙周病的产生,同时边缘完整性的丧失,不同区域适合性的差异可引起应力集中,而降低修复体的强度。材料与方法 60个上颌切牙与尖牙,30个制备成1 mm的方型台肩,30个制备成深凹面。用 Vita 铂型芯陶瓷,Vitadur-N 牙本质和牙釉质瓷制作全冠。烧结后,去除两组中半数冠的箔片。用三种粘固剂(磷酸锌粘固剂,玻璃离子粘固剂,复合树脂粘固剂)分别粘周5个未去除箔片的冠和5个去除箔片的冠到两组预
Crown fit is generally believed to exist in the gap between the preparation of teeth and the tissue surface, a large marginal space, plaque accumulation in the near-gingival margin increased secondary caries and periodontal disease, while the edge integrity Of the loss, differences in the suitability of different regions can cause stress concentration, and reduce the strength of the prosthesis. MATERIALS AND METHODS Sixty maxillary incisors and canines, 30 square shoulders of 1 mm were prepared and 30 were deep concave. Full crown was made with Vita platinum core ceramic, Vitadur-N dentin and enamel china. After sintering, the halves of the foil in both groups were removed. Three cements (zinc phosphate cement, glass ionomer cement, composite resin cements) were used to stick the five non-foil-removed crowns and the five foil-removed crowns to two sets of preforms