Department of Prosthodontics, Implantology and Biomaterials, Medical Faculty, RWTH Aachen University, Pauwelsstr. 30, 52074, Aachen, Germany.
Clin Oral Investig. 2013 Jan;17(1):275-84. doi: 10.1007/s00784-012-0700-x. Epub 2012 Mar 7.
The purpose of this prospective study was to evaluate the clinical outcome of anterior and posterior crowns made of a lithium-disilicate glass-ceramic framework material (IPS e.max Press, Ivoclar Vivadent).
A total of 104 single crowns were placed in 41 patients (mean age, 34 ± 9.6 years; 15 male, 26 female). Eighty-two anterior and 22 posterior crowns were inserted. All teeth received a 1-mm-wide chamfer or rounded shoulder preparation with an occlusal/incisal reduction of 1.5-2.0 mm. The minimum framework thickness was 0.8 mm. Frameworks were laminated by a prototype of a veneering material combined with an experimental glaze. Considering the individual abutment preconditions, the examined crowns were either adhesively luted (69.2 %) or inserted with glass-ionomer cement (30.8 %). Follow-up appointments were performed 6 months after insertion, then annually. Replacement of a restoration was defined as failure.
Four patients (10 crowns) were defined as dropouts. For the remaining 94 crowns, the mean observation time was 79.5 months (range, 34-109.7 months). The cumulative survival rate according to Kaplan-Meier was 97.4 % after 5 years and 94.8 % after 8 years. Applying log rank test, it was shown that the location of the crown did not significantly have an impact on the survival rate (p = 0.74) and that the cementation mode did not significantly influence the occurrence of complications (p = 0.17).
The application of lithium-disilicate framework material for single crowns seems to be a reliable treatment option.
Crowns made of a lithium-disilicate framework material can be used clinically in the anterior and posterior region irrespective of an adhesive or conventional cementation when considering abutment preconditions.
本前瞻性研究旨在评估由锂硅玻璃陶瓷框架材料（IPS e.max Press，Ivoclar Vivadent）制成的前后牙冠的临床效果。
将 104 个单冠放置在 41 名患者（平均年龄 34±9.6 岁；男性 15 名，女性 26 名）的 41 颗牙齿上。其中 82 个为前牙冠，22 个为后牙冠。所有牙齿均接受了 1mm 宽的倒角或圆角肩预备，牙合面/切缘预备量为 1.5-2.0mm。最小的基底厚度为 0.8mm。基底通过与实验釉料相结合的原型饰面材料进行层压。根据单个基牙的预备条件，所检查的冠采用粘结剂（69.2%）或玻璃离子体水泥（30.8%）进行粘固。修复体插入 6 个月后进行随访，之后每年进行一次。将修复体的更换定义为失败。
有 4 名患者（10 个冠）脱落。对于其余 94 个冠，平均观察时间为 79.5 个月（范围 34-109.7 个月）。根据 Kaplan-Meier 法，5 年后的累积生存率为 97.4%，8 年后为 94.8%。应用对数秩检验表明，牙位对生存率无显著影响（p=0.74），粘固方式对并发症的发生也无显著影响（p=0.17）。
应用锂硅玻璃陶瓷基底材料制作单冠是一种可靠的治疗选择。
考虑基牙预备条件，当使用粘结剂或常规粘固时，玻璃陶瓷基底材料制成的单冠在前牙和后牙区均可用于临床。
