BackgroundTo investigate tooth‐related factors that influence pocket closure (PC) and the reduction of pocket probing depths (PPD) after nonsurgical re‐instrumentation (NSRI) as part of step 3 therapy.MethodsA total of 480 patients (10,807 teeth) presenting with residual pockets 6.33 ± 3.79 months after steps 1 and 2 of periodontal therapy were included and retrospectively analyzed before and 5.93 ± 4.31 months after NSRI. Reduction of PPD and PC rates following NSRI were associated with tooth‐related factors, namely tooth type, arch, number of roots, furcation involvement (FI), pulp vitality, mobility, type of restoration, presence of plaque, and bleeding on probing (BOP), using mixed‐effects regression models.ResultsNSRI reduced periodontal pockets persisting after initial cause‐related therapy by (mean ± SD) 1.32 ± 1.79 mm in PPD, and PC rate was 40%. Moderate pockets (4–5 mm) responded better to NSRI than deep pockets (≥ 6 mm) in terms of PC (51% vs. 16%). Both PPD reduction and PC rates of deep residual pockets were significantly influenced by tooth type, arch, number of roots, and presence of BOP.ConclusionTooth type, arch, number of roots, and presence of BOP at re‐evaluation (before NSRI) had a significant and clinically relevant influence on NSRI as part of step 3 therapy. Considering these factors, particularly for deep residual pockets, may allow more tailored re‐intervention.Plain language summaryThe present study aimed to investigate the influence of tooth‐related factors on the outcome of repeated nonsurgical therapy of periodontitis. Therefore, 480 patients (10,807 teeth) presenting with clinical symptoms of persistent periodontitis after initial therapy were administered repeated nonsurgical therapy and retrospectively analyzed. Therapy outcomes were associated with tooth‐related factors, namely tooth type, tooth location (maxilla/mandible), number of roots, involvement of the root furcation area in multi‐rooted teeth, pulp vitality, mobility, restoration, presence of plaque and bleeding upon periodontal probing, using mixed‐effects models. The results revealed that repeated nonsurgical therapy was effective in reducing inflammation and clinical signs of disease, with moderate residual periodontal defects responding better than deep defects. Healing of deep defects after repeated nonsurgical therapy; however, was significantly influenced by the factors: tooth type, location, number of roots, and bleeding on probing. Considering these factors, particularly in deep residual defects which are commonly suggested to be treated surgically, may allow less invasiveness and thus a more tailored re‐intervention.

中文翻译：

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非手术重新器械检查的有效性：牙齿相关因素


背景作为第 3 步治疗的一部分，研究非手术再器械化 （NSRI） 后影响牙周袋闭合 （PC） 和牙周袋探查深度 （PPD） 减少的牙齿相关因素。方法共纳入牙周治疗第 1 步和第 2 步后 480 例 （10,807 颗牙齿） 6.33 ± 3.79 个月出现残留牙周袋的患者，并在 NSRI 之前和 NSRI 后 5.93 个月± 4.31 个月进行回顾性分析。使用混合效应回归模型，NSRI 后 PPD 和 PC 率的降低与牙齿相关因素相关，即牙齿类型、牙弓、牙根数量、分叉受累 （FI）、牙髓活力、活动度、修复类型、牙菌斑的存在和探诊出血 （BOP）。结果NSRI 在 PPD 中减少了初始原因相关治疗后持续存在的牙周袋 （平均 ± SD） 1.32 ± 1.79 mm，PC 率为 40%。就 PC 而言，中等口袋 （4-5 mm） 对 NSRI 的反应优于深口袋 （≥ 6 mm） （51% vs. 16%）。PPD 降低和 PC 深残余袋率均受牙齿类型、牙弓、牙根数量和 BOP 的存在显着影响。结论作为第 3 步治疗的一部分，牙齿类型、牙弓、牙根数量和重新评估时 BOP 的存在 （NSRI 之前） 对 NSRI 有显着且临床相关的影响。考虑这些因素，特别是对于较深的残余牙周袋，可能允许更有针对性的再干预。通俗易懂的语言总结本研究旨在调查牙齿相关因素对牙周炎重复非手术治疗结果的影响。因此，对 480 例初始治疗后出现持续性牙周炎临床症状的患者 （10,807 颗牙齿） 进行了重复非手术治疗并进行了回顾性分析。 使用混合效应模型，治疗结果与牙齿相关因素相关，即牙齿类型、牙齿位置（上颌骨/下颌骨）、牙根数量、多根牙根分叉区的参与、牙髓活力、活动度、修复、牙菌斑的存在和牙周探查时出血。结果显示，重复非手术治疗可有效减少炎症和疾病的临床体征，中度残留牙周缺损的反应优于深部缺损。重复非手术治疗后深部缺损愈合;然而，受以下因素的显著影响：牙齿类型、位置、牙根数量和探诊出血。考虑到这些因素，特别是通常建议手术治疗的深部残余缺损，可能允许较小的侵入性，从而更有针对性的再干预。