Arora Ankit, Acharya Shashi Rashmi, Vidya Saraswathi M, Sharma Padmaja
Department of Conservative Dentistry and Endodontics, Manipal College of Dental Sciences, Manipal University, Manipal, Karnataka, India.
Contemp Clin Dent. 2012 Jul;3(3):306-13. doi: 10.4103/0976-237X.103624.
Enormous advances have been made in adhesives; however, the problem of post-operative sensitivity has dragged along. Enough literature exists on the effect of air abrasion over bond strength of composites. However, not much is reported on its relation with microleakage and post operative sensitivity. Therefore, the aim of the study was to compare and evaluate dentinal hypersensitivity and microleakage associated with composite restorations in cavities preconditioned with air abrasion.
Fifteen patients were selected for the study who had to undergo extractions of both maxillary first premolars. On each patient, occlusally placed Class V cavities were made using rotary burs on both the premolars. On the right side premolar, restoration was done using total etch technique. On the left side premolar, restoration was done in similar way after preconditioning of the cavity with air abrasion. Sensitivity levels were recorded on a modified visual analogue scale preoperatively and post operatively at 1 week and one month time period. Following extraction, dye penetration test was done and 1 sample each from one group was subjected to Scanning Electron Microscope for evaluation of tooth restoration interface.
Clinically significant difference was there in post operative sensitivity levels after one month between the two groups. Increase in sensitivity was less in teeth restored after preconditioning with air abrasion. Dye penetration was also less in teeth restored after preconditioning with air abrasion. However, penetration at the gingival wall was more than the occlusal wall in both the groups.
The study consolidates the fact that microleakage and post operative sensitivity are linked directly. It also proves that air abrasion can help in reducing the post operative sensitivity to a level; however, a larger sample size would be needed to obtain more robust results with stronger validation.
粘合剂已取得了巨大进展；然而，术后敏感问题一直存在。关于空气研磨对复合材料粘结强度的影响已有足够的文献报道。然而，关于其与微渗漏及术后敏感性的关系报道较少。因此，本研究的目的是比较和评估与经空气研磨预处理的窝洞复合树脂修复相关的牙本质过敏和微渗漏情况。
选择15例需要拔除双侧上颌第一前磨牙的患者进行研究。在每位患者的双侧前磨牙上，使用旋转车针制备咬合面V类洞。右侧前磨牙采用全酸蚀技术进行修复。左侧前磨牙在窝洞经空气研磨预处理后，以类似方式进行修复。术前以及术后1周和1个月时，使用改良视觉模拟量表记录敏感程度。拔牙后，进行染料渗透试验，并从每组中各取1个样本进行扫描电子显微镜检查，以评估牙齿修复界面。
两组术后1个月的敏感程度存在临床显著差异。经空气研磨预处理后修复的牙齿，敏感程度增加较少。经空气研磨预处理后修复的牙齿，染料渗透也较少。然而，两组中牙龈壁的渗透均多于咬合壁。
本研究证实了微渗漏与术后敏感性直接相关这一事实。同时也证明，空气研磨有助于将术后敏感性降低到一定程度；然而，需要更大的样本量以获得更有力的验证结果。
