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前牙变色、缺损不仅影响患者容貌,而且危害其身心健康。目前国内仍主要采用丙烯酸酯树脂或复合树脂类贴面或脂套冠对其进行美容修复。而国外已广泛运用烤瓷贴面。作者也应用烤瓷贴面进行一些前牙修复,从临床效果观察均优于树脂贴面。 材料及方法 一、材料 高温包埋料VITA HI—Ceram Die Ma-tenial,瓷粉及液体VITA VWKR68,烤瓷炉COMMODORE Ⅱ VPE,5％氢氟酸,光固化机Optilux400,粘结剂Ultra—Bond Kit和E SPEVISIO-GEM COLOR SYSTERM。 二、方法 1.牙体预备:先用球状金刚砂钻针在牙冠唇侧四周磨出深约0.3mm的凹槽,颈部稍位于龈下,注意切匆暴露牙本质。近远中邻缘至接触区,但不破坏邻接关系,然后用柱状金刚砂钻针沿患牙唇面自然突度均匀磨除牙釉质0.5mm。最后进行切端牙备。而切端牙备的方法与该牙切端唇舌宽度以及是否增加该牙的临床牙冠长度有关。(1)当需增加牙冠长度时,牙备必须包括整个切端,并延伸止舌侧。首先整个切端磨除0.2mm,使其成一平面,以增加粘结面,然后将切唇线角磨圆钝,以防贴面在此线角折裂,最后在舌侧磨出一小斜面(chamfer)。如图(A)所示。(2)当不需
Anterior teeth discoloration, defects not only affect the patient's appearance, but also harm their physical and mental health. At present, the main domestic use of acrylic resin or composite resin veneer or grease crown to its cosmetic repair. The foreign countries have been widely used porcelain veneer. The author also applied some porcelain veneers for anterior teeth repair, which is superior to the resin veneer from the clinical observation. Materials and methods I. Materials High-temperature embedding material VITA HI-Ceram Die Ma-tenial, porcelain powder and liquid VITA VWKR68, porcelain oven COMMODORE II VPE, 5% hydrofluoric acid, light curing machine Optilux400, binder Ultra-Bond Kit and E SPEVISIO-GEM COLOR SYSTERM. Second, the method 1. Tooth preparation: the first use of spherical diamond drill in the crown around the labial side of the grinding depth of about 0.3mm groove, the neck slightly located in the subgingival, pay attention to cut the hips exposed dentin. Near the edge of the neighbors to the contact area, but does not undermine the adjacent relationship, and then use cylindrical emery drill along the natural angle of the affected face lip uniform removal of enamel 0.5mm. Last cut end of teeth equipment. The method of incising the dental preparation is related to the width of the lingual tongue of the incisor and whether to increase the clinical crown length of the tooth. (1) When increasing the crown length, the dental appliance must include the entire incision and extend the lingual side. First cut the entire cutting end 0.2mm, make it into a plane, to increase the bonding surface, and then cut the lip round corners blunt, to prevent the veneer at this line angle fracture, and finally grinding in the lingual side of a small chamfer ). As shown in Figure (A). (2) when not needed