E-max铸瓷高嵌体修复后牙牙体缺损的临床研究

目的评价E-max铸瓷高嵌体修复磨牙和前磨牙牙体缺损的临床效果。方法使用E-max铸瓷高嵌体修复根管治疗后牙体缺损患牙共173颗,其中磨牙128颗,前磨牙45颗,并于修复后即刻及修复后1年、2年、3年进行临床随访,采用改良美国公共卫生机构评价标准进行临床效果评价。结果修复后1年、2年、3年的累计失访牙数为3颗、3颗、8颗。第3年时,复诊病例中无1颗发生高嵌体脱落;继发龋的发生率仅为0.6%（1/165）;牙体完整性也较为理想,除7颗边缘釉质崩裂外,无牙体折断发生;崩瓷或瓷裂发生率为3.0%（5/165）;颜色匹配性评级,与邻牙的颜色及半透明性一致、少许不一致的比例分别为90.3%（149/165）和9.7%（16/165）;边缘适合性和邻接点正常的比例均为97.0%（160/165）。结论采用E-max铸瓷高嵌体是修复根管治疗后牙体缺损较为可靠的一种方法。

Restoration of posterior teeth by E-max cast porcelain onlays

Objective To restore tooth defect of endodontically treated premolars and molars with full-ceramic onlays,and to study the clinical effect of these onlays.Methods One hundred and twenty-eight molars and 45 premolars were restored with E-max onlays after root canal therapy.After 1 year,2 years and 3 years,patients were recalled for clinical study according to the modified USPHS criteria.Results The loss of follow-up after 1 year,2 years and 3 years are 3,3 and 8 restorations.None of their onlays fell out or none of them has severe tooth fracture after 3 years;0.6%（1/165） secondary caries and 3%（5/165） porcelain fracture occurred;90%（149/165） and 10%（16/165） were ascribed to A and B of color match;97%（160/165） had A-level marginal fit and contact.Conclusion It is a reliable method to restore tooth defect after root canal therapy with E-max full-ceramic onlays.However,the long term effect is still to be observed.