Oper Dent. 2020 Jan/Feb;45(1):E11-E20. doi: 10.2341/18-256-C. Epub 2019 Dec 3.
This randomized clinical trial evaluated the influence of the occlusogingival distance (OGD) of noncarious cervical lesions (NCCLs) on the clinical performance of a regular bulk-fill resin composite and a regular nanofilled resin composite.
A total of 140 restorations were randomly placed in 77 participants by one operator. NCCLs were divided into four groups (n=35) according to OGD (1.5 mm±10% or 3 mm±10%) and resin composites (Filtek Bulk Fill Posterior [B] or Filtek Z350 XT [C]) used: 1.5 mm-B, 1.5 mm-C, 3 mm-B, and 3 mm-C. A two-step self-etch adhesive (Clearfil SE Bond) was applied following manufacturer instructions in all restorative procedures. Restorations were polished 1 week after placement. Clinical evaluation was performed at baseline (7 days), 6 months, and 1 year by two calibrated examiners, according to the modified US Public Health Service criteria evaluating fractures/retention, marginal staining, marginal adaptation, recurrence of caries, anatomic form, postoperative sensitivity, and surface texture. The Kruskal-Wallis test was used for intergroup comparison in each follow-up; the Friedman analysis of variance, followed by the least significant difference test (multiple comparisons) was used for intragroup comparison between baseline and follow-up times (=0.05).
Two restorations were lost at 12 months (1 for 1.5 mm-B and 1 for 3 mm-B). The retention rates at 12 months were 100% for 1.5 mm-C, 97% for 1.5 mm-B, 100% for 3 mm-C; and 97% for 3 mm-B, with no statistical difference among the groups (=0.570). At 12 months, a statistically significant difference was found among the follow-up times for the same group (1.5 mm-B, 1.5 mm-C, and 3 mm-B) regarding the marginal staining criterion; moreover, the 3 mm-C group showed a significant difference from 6 months. No significant difference was found for the other parameters.
Both resin composites showed acceptable clinical performance, and the OGD of NCCLs did not influence the clinical performance of resin composite restorations after 12 months.
本随机临床试验评估了非龋性颈缘缺损（NCCL）的牙合龈距（OGD）对常规块状充填树脂复合材料和常规纳米充填树脂复合材料临床性能的影响。
一位操作者随机将 140 个修复体放置在 77 名参与者中。根据 OGD（1.5mm±10%或 3mm±10%）和使用的树脂复合材料（Filtek Bulk Fill Posterior [B]或 Filtek Z350 XT [C]），将 NCCLs 分为四组（n=35）：1.5mm-B、1.5mm-C、3mm-B 和 3mm-C。在所有修复过程中，均按照制造商的说明使用两步自酸蚀粘结剂（Clearfil SE Bond）。放置后 1 周进行修复体抛光。由两位经过校准的检查者根据改良后的美国公共卫生服务标准评估骨折/保留率、边缘着色、边缘适应性、龋齿复发、解剖形态、术后敏感和表面质地，在基线（7 天）、6 个月和 1 年进行临床评估。在每次随访中，采用 Kruskal-Wallis 检验进行组间比较；采用 Friedman 方差分析，然后采用最小显著差异检验（多重比较）对组内基线与随访时间进行比较（=0.05）。
12 个月时，有 2 个修复体丢失（1 个为 1.5mm-B，1 个为 3mm-B）。12 个月时的保留率为 100%（1.5mm-C）、97%（1.5mm-B）、100%（3mm-C）和 97%（3mm-B），各组之间无统计学差异（=0.570）。在 12 个月时，同一组的随访时间在边缘着色标准方面存在统计学差异；此外，3mm-C 组与 6 个月时相比存在显著差异。其他参数无显著差异。
两种树脂复合材料均表现出可接受的临床性能，NCCL 的 OGD 对树脂复合材料修复体 12 个月后的临床性能没有影响。
