Gherlone Enrico, Mandelli Federico, Capparè Paolo, Pantaleo Giuseppe, Traini Tonino, Ferrini Francesco
Department of Dentistry, Vita Salute University, San Raffaele Hospital, Milan, Italy.
Department of Dentistry, Vita Salute University, San Raffaele Hospital, Milan, Italy.
J Dent. 2014 Sep;42(9):1151-5. doi: 10.1016/j.jdent.2014.06.002. Epub 2014 Jun 12.
To evaluate the clinical performance of glass-ceramic/zirconia crowns fabricated using intraoral digital impressions - a retrospective study with a three-year follow-up.
70 consecutive patients with a total of 86 glass-ceramic/zirconia crowns were treated by a single clinician using standardized clinical and laboratory protocols. A complete digital workflow was adopted for the purpose except for the veneering procedure for the glass-ceramic crowns. Occlusal adjustments were made before the ceramic glazing procedure. Before cementation, all abutments where carefully cleaned with a 70% alcoholic solution and air dried. Cementation was performed using dual-curing, self-adhesive resin cement. Patients were re-examined after 12, 24 and 36 months, to assess crown chipping/fractures.
After the three-year follow-up, none of the zirconia-based restoration was lost ("apparent" survival rate 100%) otherwise, the chipping rate of the veneering material increased from 9.3% after 12 months, to 14% after 24 months to 30.2% after 36 months. As a consequence, the "real" success rate after 3 years was 69.8%.
After 3 years the success rate of zirconia-based crowns was 69.8%, while the incidence of the chipping was 30.2%. Assuming an exponential increase in chipping rate between 12 and 36 months it can be argued that, among others, the fatigue-mechanism could be advocated as the main factor for the failure of glass-ceramic veneered zirconia especially after 24 months.
评估使用口内数字印模制作的玻璃陶瓷/氧化锆全冠的临床性能——一项为期三年随访的回顾性研究。
由一名临床医生采用标准化的临床和实验室方案，对连续70例患者共86颗玻璃陶瓷/氧化锆全冠进行治疗。除玻璃陶瓷全冠的贴面程序外，采用完整的数字工作流程。在陶瓷上釉程序之前进行咬合调整。在粘结前，所有基牙均用70%酒精溶液仔细清洁并吹干。使用双固化自粘结树脂水门汀进行粘结。在12、24和36个月后对患者进行复查，以评估全冠的崩瓷/折断情况。
三年随访后，所有氧化锆基修复体均未脱落（“表观”生存率100%），否则，贴面材料的崩瓷率从12个月后的9.3%增加到24个月后的14%，再到36个月后的30.2%。因此，三年后的“实际”成功率为69.8%。
三年后，氧化锆基全冠的成功率为69.8%，而崩瓷发生率为30.2%。假设在12至36个月之间崩瓷率呈指数增长，可以认为，除其他因素外，疲劳机制可能是玻璃陶瓷贴面氧化锆失败的主要因素，尤其是在24个月后。
