Statement of problem

Evidence of the behavior of the periodontal tissues around anterior teeth restored with the biologically oriented preparation technique (BOPT) is available. However, outcomes of this technique in posterior teeth restored with fixed partial dentures (FPDs) are lacking.

Purpose

The purpose of this randomized controlled clinical trial was to evaluate the clinical, mechanical, and biological behavior of posterior 3-unit FPDs placed on teeth prepared with BOPT.

Material and methods

Forty participants received a 3-unit zirconia FPD in the posterior region of the mandible or maxilla. Twenty FPDs were placed on teeth prepared with BOPT (study group) and 20 on teeth with a horizontal chamfer finishing line (control group). Follow-up examinations were performed 1, 3, and 5 years after treatment to evaluate periodontal responses around the prepared teeth by means of the following parameters: plaque index, gingival index, probing depth, and marginal stability (MS). Mechanical behavior was also assessed, as were any complications.

Results

After the 5-year follow-up, 57.9% of the control group and 35% of the BOPT group presented a plaque index of 1. The gingival index was 1 in 68.4% of the control group and 30% of the BOPT group after the follow-up period. In the analysis of probing depth, 26.3% of teeth in the control group had pockets of more than 3 mm in depth, whereas the BOPT group had only 10%. Marginal stability appeared in 100% of the BOPT group, whereas only 10.5% of the control group exhibited gingival stability. Complications during the follow-up period were similar, 20% in the control group and 15% in the BOPT group.

Conclusions

Posterior FPDs prepared by using BOPT had a good clinical response over a 5-year follow-up, with a low gingival index, a small increase in pocket depth, and a 100% marginal stability of the surrounding tissues. High survival rates after 5 years indicated that the technique produced predictable outcomes.

中文翻译：

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生物导向制备技术后牙固定局部义齿的临床行为：一项为期5年的随机对照临床试验

问题陈述

可提供使用生物定向制备技术 (BOPT) 修复的前牙周围牙周组织行为的证据。然而，这种技术在用固定局部义齿 (FPD) 修复的后牙中的结果是缺乏的。

目的

这项随机对照临床试验的目的是评估放置在用BOPT准备的牙齿上的后3单元FPD的临床，机械和生物学行为。

材料与方法

40 名参与者在下颌骨或上颌骨的后部区域接受了 3 单位氧化锆 FPD。将 20 个 FPD 放置在用 BOPT 制备的牙齿上（研究组），将 20 个放置在具有水平倒角精加工线的牙齿上（对照组）。治疗后 1、3 和 5 年进行随访检查，通过以下参数评估预备牙齿周围的牙周反应：菌斑指数、牙龈指数、探诊深度和边缘稳定性 (MS)。还评估了机械行为，以及任何并发症。

结果

5年随访后，57.9%的对照组和35%的BOPT组牙菌斑指数为1。68.4%的对照组和30%的BOPT组牙龈指数为1随访期。在探诊深度分析中，对照组有 26.3% 的牙齿有深度超过 3 mm 的牙槽穴，而 BOPT 组只有 10%。边际稳定性出现在 BOPT 组的 100% 中，而对照组中只有 10.5% 表现出牙龈稳定性。随访期间的并发症相似，对照组为20％，BOPT组为15％。

结论

使用BOPT制备的后路FPD在5年的随访中具有良好的临床反应，其牙龈指数低，囊袋深度增加小，周围组织的边缘稳定性为100％。5 年后的高存活率表明该技术产生了可预测的结果。