Gupta Abhishek, Musani Smita, Dugal Ramandeep, Jain Nikhil, Railkar Bhargavi, Mootha Ajay
Int J Periodontics Restorative Dent. 2014 May-Jun;34(3):405-11. doi: 10.11607/prd.1706.
The aim of this study was to evaluate the use of bonded partial restorations compared with full-coverage porcelain-fused-to-metal (PFM) crowns as a viable treatment option for endodontically treated posterior teeth. Forty-five recently extracted maxillary first premolars were collected, endodontically treated, and mounted in acrylic blocks. The specimens were randomly divided into three groups and prepared to receive their respective restorations. The teeth in group 1 received full-coverage porcelain-fused-to-metal crowns. The teeth in group 2 received bonded partial restorations made from pressed ceramics (lithium disilicate) involving a functional cusp (palatal). Finally, group 3 received bonded partial restorations made from pressed ceramics involving the buccal cusp and keeping a functional cusp (palatal) intact. All group 1 restorations were cemented using glass ionomer cement. Restorations in groups 2 and 3 were bonded using a dual-cured resin cement. All specimens were subjected to an aging process and tested for shear bond strength using a universal loading machine. The mean force applied in Newtons to cause failure for group I was 674.90 ± 94.16 N, for group 2, 463.46 ± 61.11 N, and for group 3, 849.33 ± 68.92 N. P values obtained using one-way analysis of variance showed a highly significant difference between groups 2 and 3 (P = .001), groups 1 and 2 (P = .001), and groups 1 and 3 (P = .001). The fracture modes observed in all groups involved restorations and tooth fracture. This in vitro study suggests that endodontically treated posterior teeth with intact functional cusps can be restored with bonded partial porcelain restorations. However, if the loss of tooth structure involves the functional cusp, full-coverage PFM crowns are the treatment of choice.
本研究的目的是评估粘结式部分修复体与全冠烤瓷熔附金属（PFM）冠相比，作为牙髓治疗后磨牙的一种可行治疗选择的效果。收集了45颗近期拔除的上颌第一前磨牙，进行牙髓治疗后，固定在丙烯酸树脂块中。将标本随机分为三组，并准备接受各自的修复体。第1组的牙齿接受全冠烤瓷熔附金属冠修复。第2组的牙齿接受由压制陶瓷（二硅酸锂）制成的粘结式部分修复体，涉及一个功能尖（腭尖）。最后，第3组的牙齿接受由压制陶瓷制成的粘结式部分修复体，涉及颊尖并保持功能尖（腭尖）完整。第1组的所有修复体均使用玻璃离子水门汀粘结。第2组和第3组的修复体使用双固化树脂水门汀粘结。所有标本均经过老化处理，并使用万能加载机测试其剪切粘结强度。第1组导致失败的以牛顿为单位施加的平均力为674.90±94.16N，第2组为463.46±61.11N，第3组为849.33±68.92N。使用单因素方差分析获得的P值显示，第2组和第3组之间（P = 0.001）、第1组和第2组之间（P = 0.001）以及第1组和第3组之间（P = 0.001）存在高度显著差异。所有组中观察到的断裂模式均涉及修复体和牙齿断裂。这项体外研究表明，具有完整功能尖的牙髓治疗后磨牙可以用粘结式部分瓷修复体进行修复。然而，如果牙齿结构的丧失涉及功能尖，则全冠PFM冠是首选治疗方法。
