Operative Dentistry Department, Dental Sciences, Center of Health Sciences, Federal University of Santa Catarina - UFSC, Florianópolis, Santa Catarina, Brazil.
J Esthet Restor Dent. 2017 Sep;29(5):309-316. doi: 10.1111/jerd.12320. Epub 2017 Jul 22.
This study aimed to evaluate the ability of the proposed technique in producing restorations that exhibit mimesis with tooth structure and to define a restorative clinical protocol.
For this study a typodont was used. The right upper central incisor with Class IV lesion was restored with the layering technique (reference tooth, RT). For the left upper central incisor with Class IV lesion, six teeth were restored monochromatically (test teeth, TT), using DA3.5 (n = 3) and DA4 (n = 3) composite resins-resulting in six unsatisfactory color restorations. TT were divided into six groups depending on the color of unsatisfactory restoration and preparation depth. First, a preparation was realized on the labial surface with 0.5 mm, 0.7 mm or 1.0 mm of depth. A second preparation was then performed to reproduce the dentinal mamelons. Next, adhesive procedures were performed and the teeth restored. Opaque halo, opalescent halo and vestibular enamel were then reproduced by the addition of different composite resins. The RT and TT were photographed side by side in typodont to obtain six photographic prints. The photographs of the groups were subjected to visual evaluation by 120 volunteers via a questionnaire. Data were analyzed by the prevalence of answers, and Chi-square test was used to investigate the association between variables at .05 significance. Furthermore, ΔE of groups was evaluated in comparison RT.
The results demonstrated that the moderate intensity restorations (DA3.5) with depths of 0.5 mm and 0.7 mm had the highest prevalence of acceptance. For severe intensity restorations (DA4), the preparation depth of 1.0 mm obtained better acceptance.
The technique was able to modify the final color of Class IV restorations, producing satisfactory color restorations.
This technique can be used for color correction in cases of Class IV restorations, in situations where there is no time for immediate layered restoration, and as a restorative technique.
本研究旨在评估所提出的技术在制作具有牙体仿生效果的修复体方面的能力，并确定一种修复临床方案。
本研究使用了一种仿头模型。用分层技术（参照牙，RT）修复右侧上颌中切牙的 IV 类缺损。对于左侧上颌中切牙的 IV 类缺损，使用 DA3.5（n=3）和 DA4（n=3）复合树脂对 6 颗牙齿进行单色修复（测试牙，TT），导致 6 颗颜色不满意的修复体。根据不满意修复体的颜色和预备深度，将 TT 分为 6 组。首先，在唇面进行 0.5、0.7 或 1.0mm 深度的预备。然后进行第二次预备以再现牙本质小丘。接下来，进行粘接程序并修复牙齿。然后通过添加不同的复合树脂来再现不透明晕、乳光晕和颊侧釉质。将 RT 和 TT 并排放在仿头模型中拍照，获得 6 张照片。将照片分发给 120 名志愿者进行问卷调查，进行视觉评估。通过答案的出现频率对数据进行分析，并使用卡方检验在.05 显著性水平下调查变量之间的关系。此外，还评估了组内的 ΔE 值与 RT 的比较。
结果表明，中等强度修复体（DA3.5）的 0.5mm 和 0.7mm 深度的预备具有最高的可接受性。对于高强度修复体（DA4），1.0mm 的预备深度获得了更好的可接受性。
该技术能够改变 IV 类修复体的最终颜色，产生令人满意的颜色修复体。
该技术可用于 IV 类修复体的颜色校正，适用于没有时间进行立即分层修复的情况，并且可用作修复技术。
