方法:这是一个随机的,控制,优越性,双盲,平行组,两臂试验,分配比例为1:1。这项研究旨在评估腔设计是否会影响CAD/CAM生成的间接树脂复合材料修复体的临床表现,在经过两年的随访后,使用改良的USPHS标准进行了评估。
方法:根据所进行的腔设计,将30名接受恒磨牙MOD腔牙髓治疗的参与者随机分为两个平行组(n=30个修复体),其中第1组没有进行肘节复位(嵌体),第2组进行肘节复位(覆盖)。所有纸浆室都填充有散装填充可流动复合材料,并按照间接性修复腔的标准制备腔,并使用纳米杂化复合树脂块(Brilliant,Coltene,瑞士)。修复体在基线时使用修改后的USPHS标准进行评估,六个月,为期一年和两年的随访。对于定性数据,频率(n)和百分比(%)用于显示数据,而平均值和标准偏差(SD)用于定量数据。使用Shapiro-Wilk和Kolmogorov-Smirnov检验评估了数据的正常性。对于每一次测试,P≤0.05作为显著性阈值。
结果:26名个体在接受指定干预后完成了随访期。组间比较显示,在6个月和12个月的观察点,叠加设计具有明显更好的边缘适应性,变色或牙齿/修复骨折的发生率较低,与镶嵌设计相似的边缘完整性和龋齿发生率。24个月后,叠加设计仍然具有更好的边际适应性,与嵌体设计相比,变色或牙齿/修复骨折的发生率较低,龋齿的发生率较低,而两种设计之间的边际完整性没有差异。
结论:牙髓治疗的牙齿减少显示出比牙尖保留更好的临床表现,前者更可靠。
METHODS: This is a randomized, controlled, superiority, double-blinded, parallel-group, two-arms trial with an allocation ratio of 1:1. This study aimed to assess whether the cavity design could affect the clinical performance of the CAD/CAM generated indirect resin composite restoration in endodontically treated teeth (ETT) evaluated using the Modified USPHS criteria after a two-year follow up.
METHODS: A total of 30 participants who underwent endodontic treatment for MOD cavities in permanent molars were divided randomly into two parallel groups (n = 30 restorations) according to the performed cavity design to group 1 in which there was no cuspal reduction (inlay) and group 2 in which cuspal reduction was performed (overlay). All pulp chambers were filled with bulk fill flowable composite, and the cavities were prepared following the criteria of the cavities for indirect restorations and restored using nano-hybrid composite resin blocks (Brilliant, Coltene, Switzerland). The restorations were evaluated using the modified USPHS criteria at baseline, six months, one-year and two years follow-up visits. For qualitative data, frequencies (n) and percentages (%) were used to display the data, while mean and standard deviation (SD) were used for quantitative data. The normality of the data was evaluated using the Shapiro-Wilk and Kolmogorov-Smirnov tests. For every test, P ≤ 0.05 was used as the significance threshold.
RESULTS: Twenty-six individuals completed the follow-up period after receiving the assigned intervention.The inter-group comparison showed that, at the 6- months and 12- months observation points, the overlay design had significantly better marginal adaptation, less incidence of discoloration or tooth/restoration fracture, and similar marginal integrity and caries incidence to the inlay design. After 24- months, the overlay design still had better marginal adaptation, less incidence of discoloration or tooth/restoration fracture and less caries incidence in comparison to the inlay design, while there was no difference in the marginal integrity between either design.
CONCLUSIONS: Cuspal reduction in endodontically treated teeth showed better clinical performance than the cusp preservation thus, the former is more reliable.