目的:这项体外研究旨在评估在牙齿漂白和抗氧化剂的使用后,在陶瓷层压板贴面的粘合界面中产生的美学折衷。因此,对色坐标和白化指数(WID)进行了评估,将白度变化(ΔWID)结果与可感知性和可接受性阈值进行比较。
方法:总共,根据表面处理(未漂白和漂白的搪瓷),将88个牛搪瓷样品(7×8×4mm;n=8)提交给陶瓷层压板贴面linting协议,抗氧化剂(对照;10%抗坏血酸和10%α-生育酚),和luting期(24小时后和14天后)。对于luteIPSe.max陶瓷修复体(7×8×0.6mm),使用了TetricN-Bond通用粘合剂系统和Variolink美学LC树脂水泥。在UV-B人工加速老化252、504和756小时之前和之后,使用紫外-可见分光光度计(UV-VIS)测量EL*a*b*坐标。L*,a*,和b*轴分别评估,通过改变牙科白度指数(WID)来评估增白稳定性(ΔWID)效果。使用50:50%视觉阈值来评估ΔWID值(白度可感知性[WPT]和白度可接受性[WAT])。颜色参数变化(ΔL*Δa*Δb*),WID,和ΔWID数据进行双向重复测量方差分析,然后进行Tukey检验(α=0.05)。
结果:不同的紫外线老化周期影响了色坐标,WID,和不考虑漂白处理的陶瓷修复体的ΔWID,抗氧化剂溶液和光照期(P<.05)。总的来说,对于所有实验组,UV老化期后的ΔWID值高于可感知性和可接受性阈值(分别为WPT=0.72和WAT=2.62)(P<.05)。抗氧化作用14天后,未漂白和10%抗坏血酸处理的搪瓷表现出较低的ΔL*和Δb*值,而对照组显示较低的Δa*值。与对照组相比,所有实验组在ΔWID上表现相似,无论分析的紫外线老化期如何(P>.05)。
结论:α-生育酚是一种合适的抗氧化剂溶液,可在釉质漂白后24小时使用,不会损害陶瓷层压贴面的临床可接受性。
结论:使用抗氧化剂后,陶瓷层压板贴面的粘合界面可能会变暗,从而影响修复体的临床可接受性。
This in vitro study aimed to evaluate the aesthetic compromise generated in adhesive interface of ceramic laminate veneer luted after tooth bleaching and the use of antioxidant agents. Thus, the chromatic coordinates and whitening index (WID) were evaluated, comparing whiteness changes (ΔWID) results to perceptibility and acceptability thresholds.
In total, 88 bovine enamel samples (7 × 8 × 4 mm; n = 8) were submitted to the ceramic laminate veneer luting protocol according to surface treatment (unbleached and bleached enamel), antioxidant agents (control; 10% ascorbic acid and 10% α-tocopherol), and luting periods (after 24 h and after 14 days). To lute IPS e.max ceramic restorations (7 × 8 × 0.6 mm), Tetric N-Bond Universal adhesive system and Variolink Aesthetic LC resin cement were used. An ultraviolet-visible spectrophotometer (UV-VIS) was utilized to measure CIE L*a*b* coordinates prior to and after UV-B artificial accelerated aging for 252, 504, and 756 h. L*, a*, and b* axes were evaluated separately, and the whitening stability (ΔWID) effect was assessed by varying the whiteness index for dentistry (WID). The 50:50% visual threshold was used to evaluate ΔWID values (whiteness perceptibility [WPT] and whiteness acceptability [WAT]). Color parameters changes (ΔL*Δa*Δb*), WID, and ΔWID data were subjected to 2-way repeated measures ANOVA followed by Tukey\'s test (α = 0.05).
Different UV-aging periods influenced the chromatic coordinates, WID, and ΔWID of the ceramic restorations regardless of the bleaching treatment, antioxidant solutions and luting periods (P < .05). In general, ΔWID values after UV-aging periods were above perceptibility and acceptability thresholds (WPT = 0.72 and WAT = 2.62, respectively) for all experimental groups (P < .05). Unbleached and 10% ascorbic acid-treated enamels luted after 14 days of the antioxidant action exhibited lower ΔL* and Δb* values, while control group showed lower Δa* values. All experimental groups showed similar performance on ΔWID compared to the control group, regardless of the UV-aging period analyzed (P > .05).
α-tocopherol is a suitable antioxidant solution to be used 24 h post enamel bleaching not compromising clinical acceptability of ceramic laminate veneers.
The adhesive interface of ceramic laminate veneers may appear darker after the use of antioxidant agents affecting the clinical acceptability of the restorations.