Department of Prosthodontics, Faculty of Dentistry, Van Yuzuncu Yil University, Van, Turkey.
Department of Restorative Dentistry, Faculty of Dentistry, University of Van Yuzuncu Yil, Van, Turkey.
Lasers Med Sci. 2021 Aug;36(6):1323-1335. doi: 10.1007/s10103-021-03266-5. Epub 2021 Feb 10.
The purpose of this clinical study was to compare the effects of the gingival displacement techniques of retraction cord, cordless paste system, and Er,Cr:YSGG laser troughing on the periodontal tissues around the crown restoration produced using a digital scan. This was analyzed by recording the probing depth (PD), plaque index, gingival index (GI), mobility, sensitivity, and bleeding on probing (BOP) index. This study included 60 mandibular 1 molars from 52 participants (20 males and 32 females) requiring crown restoration. The margin lines of the crown preparations were placed 1 mm subgingivally. Based on the gingival displacement technique used, the patients were divided into three groups: retraction cord, cordless paste system, and Er,Cr:YSGG laser troughing. A digital scan of the prepared tooth was performed. Follow-up appointments were scheduled at five different times: 1 day, 1 month, 3 month, 6 month, and 1 year. Six periodontal indices were used to assess the periodontal health. The chi-square test was used to compare categorical variables depending on the groups. There was a significant difference in the PD, GI, and BOP index scores among the three techniques during the 1-year clinical monitoring (p < 0.001). The PD in the three zones of the buccal surface showed a significant increase with time in the retraction cord and cordless paste system groups (p < 0.001). The highest GI scores were observed in the retraction cord group on the 1 day. The Er,Cr:YSGG laser troughing procedure produced lower PD, GI, and BOP index scores as compared to the retraction cord and cordless paste system procedures in the 1-year period.
本临床研究的目的是比较牙龈移位技术（橡皮障、无绳膏系统和 Er,Cr:YSGG 激光沟）对数字化扫描牙冠修复周围牙周组织的影响。通过记录探诊深度（PD）、菌斑指数、牙龈指数（GI）、松动度、敏感度和探诊出血（BOP）指数来进行分析。本研究纳入了 60 颗来自 52 名患者（20 名男性和 32 名女性）的下颌第一磨牙，这些患者需要进行牙冠修复。牙冠制备的边缘线位于龈下 1mm 处。根据使用的牙龈移位技术，患者被分为三组：橡皮障、无绳膏系统和 Er,Cr:YSGG 激光沟。对预备好的牙齿进行数字化扫描。预约随访时间为五个不同时间点：第 1 天、第 1 个月、第 3 个月、第 6 个月和第 1 年。使用六个牙周指数评估牙周健康状况。根据组间差异，采用卡方检验比较分类变量。在为期 1 年的临床监测中，三种技术的 PD、GI 和 BOP 指数得分存在显著差异（p<0.001）。在橡皮障和无绳膏系统组中，颊面三个区域的 PD 在整个 1 年内随时间显著增加（p<0.001）。在第 1 天，橡皮障组的 GI 评分最高。与橡皮障和无绳膏系统组相比，在 1 年内，Er,Cr:YSGG 激光沟技术产生的 PD、GI 和 BOP 指数得分较低。
