Department of Operative Dentistry and Endodontics, Faculty of Dentistry, Mahidol University, Bangkok, Thailand.
Department of Conservative Dentistry, Faculty of Dentistry, Prince of Songkla University, Songkhla, Thailand.
J Esthet Restor Dent. 2023 Sep;35(6):904-916. doi: 10.1111/jerd.13072. Epub 2023 Jun 19.
To evaluate the optical match between enamel and resin composites fabricated using mono-layered and double-layered techniques.
Enamel slabs were prepared from human upper incisors and canines. Mono-layered composite replicas were prepared from seven Filtek Z350XT and Estelite Sigma shades using silicone molds prepared from the respective enamel surfaces. Translucent and enamel shades (A2 or A3) of the two materials were produced from incisor molds for double-layered replicas, and the groups with the best results underwent accelerated aging. Spectrophotometric evaluation was performed using CIE color system. The differences in translucency (ΔTP) and color (ΔE ) between the enamel and paired composite replicas were calculated and analyzed using parametric statistics (α = 0.05).
For the mono-layered composites, white enamel and translucent shades of Filtek yielded the lowest ΔTP for canines (4.6) and incisors (8.9), respectively. The ΔE of mono-layered replicas ranged from 5.1 to 11.8. Double-layered Filtek replicas displayed a better 1-day optical match with the lowest ΔTP (3.4-4.0) and ΔE (4.2-4.6), irrespective of each layer's thickness.
For canines, the lowest ΔTP of Filtek white enamel was close to the acceptable threshold (4.43). For incisors, the thicker translucent double-layered Filtek composites demonstrated the greatest optical match before and after aging.
Upper incisors and canines have distinct enamel optical properties. Enamel layering using specific double-layered resin composites could achieve a better optical match with upper incisor enamel.
评价单层和双层技术制备的釉质和树脂复合材料的光学匹配。
从人上颌切牙和尖牙制备釉质板。使用各自釉质表面的硅模具从七种 Filtek Z350XT 和 Estelite Sigma 色调制备单层复合材料复制品。从切牙模具制备双层复制品的半透明和釉质色调（A2 或 A3），并对结果最佳的组进行加速老化。使用 CIE 颜色系统进行分光光度评估。使用参数统计（α=0.05）计算和分析釉质和配对复合材料复制品之间的半透明度（ΔTP）和颜色（ΔE）差异。
对于单层复合材料，Filtek 的白色釉质和半透明色调在尖牙（4.6）和切牙（8.9）中产生的 ΔTP 最低。单层复制品的 ΔE 范围为 5.1 至 11.8。双层 Filtek 复制品具有更好的 1 天光学匹配，最低的 ΔTP（3.4-4.0）和 ΔE（4.2-4.6），与每层的厚度无关。
对于尖牙，Filtek 白色釉质的最低 ΔTP 接近可接受阈值（4.43）。对于切牙，老化前后，较厚的半透明双层 Filtek 复合材料表现出最大的光学匹配。
上颌切牙和尖牙具有不同的釉质光学特性。使用特定的双层树脂复合材料进行釉质分层可以与上颌切牙的釉质实现更好的光学匹配。
