Mubarakali Mohamed Jubair Hashir, BDS, MDS, Thai Moogambigai Dental College, Chennai, Tamil Nadu, India.
Periasamy Ravishankar, BDS, MDS, Thai Moogambigai Dental College, Chennai, Tamil Nadu, India.
Oper Dent. 2021 Nov 1;46(6):609-620. doi: 10.2341/20-222-C.
The tooth and the composite restoration can undergo a change in color after the restorative procedure over time. The purpose of this randomized clinical trial was to evaluate the color difference (ΔE) of two types of composite resins and remaining tooth structure over a period of 28 days.
A total of 40 teeth in 30 patients with Class IV caries or EllisClass II fracture in maxillary incisors were randomized into two groups based on the type of composite resin used for restoration: IPS Empress (n=20 teeth) and Filtek Z250 (n=20 teeth). Shade selection was done using a spectrophotometer. Restorations were performed using an anatomical layering technique, and finishing and polishing was done after 48 hours. Baseline spectrophotometer color values for the remaining tooth structure were measured before isolation and for composite restorations, 10 minutes after light cure. Further color evaluations using a spectrophotometer for the remaining tooth structure and composite restorations were done at 48 hours (both before and immediately after finishing and polishing), 7days, 14 days, and 28 days, and color difference (ΔE) from baseline values for remaining tooth structure and restorations and ΔE between remaining tooth structure and restorations were calculated. Descriptive statistics including mean, standard deviation, and frequencies were computed. Mann-Whitney U test was done to compare spectrophotometer values.
There was a significant reduction in mean color difference (ΔE) from baseline values for both tooth (p<0.05) and composite restoration (p<0.05) at all evaluation periods in both groups. Filtek Z250 showed significantly lower mean ΔE between the tooth and the composite resin restoration than IPS Empress at 48 hours (before and after finishing and polishing), 7 days and 14 days (p<0.05). At the 28 day recall, mean ΔE value of IPS Empress restorations to tooth structure was 3.5, while the mean ΔE value of Filtek Z250 restorations to tooth structure was 3.6, which was not statistically different (p>0.05).
The remaining tooth structure as well as the composite restorations showed color changes at all evaluation periods, compared to baseline values in both the composite resin groups. Filtek Z250 exhibited less ΔE with remaining tooth structure at 48 hours, 7 days, and 14 days, when compared to IPS Empress. The composite restorations of both the groups reached clinically acceptable color match (mean ΔE<3.7) with the remaining tooth structure 28 days after the procedure.
牙和复合修复体在修复后随着时间的推移会发生颜色变化。本随机临床试验的目的是评估两种类型的复合树脂和剩余牙体组织在 28 天内的色差（ΔE）。
根据用于修复的复合树脂类型，将 30 名上颌切牙有 IV 类龋或 Ellis 类 II 折裂的患者的 40 颗牙齿随机分为两组：IPS Empress（n=20 颗牙）和 Filtek Z250（n=20 颗牙）。使用分光光度计选择色调。采用解剖分层技术进行修复，48 小时后进行修整和抛光。在隔离前测量剩余牙体结构的基线分光光度计颜色值，以及复合修复体在光固化后 10 分钟后测量。在 48 小时（修整和抛光前后）、7 天、14 天和 28 天时，使用分光光度计对剩余牙体结构和复合修复体进一步进行颜色评估，并计算剩余牙体结构和修复体的基线值的色差（ΔE）以及剩余牙体结构和修复体之间的ΔE。计算了包括平均值、标准差和频率在内的描述性统计数据。使用 Mann-Whitney U 检验比较分光光度计值。
两组在所有评估期内，牙（p<0.05）和复合修复体（p<0.05）的平均色差（ΔE）均较基线值显著降低。Filtek Z250 在 48 小时（修整和抛光前后）、7 天和 14 天时，牙与复合树脂修复体之间的平均ΔE 明显低于 IPS Empress，差异有统计学意义（p<0.05）。在 28 天的随访中，IPS Empress 修复体与牙体结构的平均 ΔE 值为 3.5，而 Filtek Z250 修复体与牙体结构的平均 ΔE 值为 3.6，差异无统计学意义（p>0.05）。
与复合树脂组的基线值相比，所有评估期内的剩余牙体结构和复合修复体均发生了颜色变化。Filtek Z250 在 48 小时、7 天和 14 天时与剩余牙体结构的平均ΔE 较 IPS Empress 更小。两组的复合修复体在术后 28 天与剩余牙体结构达到临床可接受的颜色匹配（平均ΔE<3.7）。
