瓷厚度和粘接剂色调对瓷贴面颜色的影响

Effect of ceramic thickness and resin cement shades on final color of heat-pressed ceramic veneers

目的探讨粘接剂与相应试色糊剂颜色效果的一致性，分析色调和瓷厚度对瓷贴面最终颜色的影响，以期为临床提供参考。方法选用60颗c2色调树脂牙，进行贴面修复牙体预备。制作中部厚度为0．50和0．75mm的二硅酸锂热压铸陶瓷贴面。使用6种色调（LV-3、LV-2、HV＋3、TR、A3、WO色）试色糊剂试色，相应色调粘接剂粘接（每种色调每种厚度的样本量均为5）。用比色仪测量粘接前、试色时及粘接后贴面颈部、中部和切端色度参数，计算贴面粘接前与粘接后的色差（△E1）、试色时与粘接后的色差（AE2）。结果△E1和△E2显著受瓷厚度、粘接剂色调和测色部位的影响（P〈0．05）。6种色调的△E1为0．59～8．27，其中HV＋3、WO色调的△E1均值〉2．72。6种色调的AE2为0．60～2．56，其中HV＋3、WO和A3色调的AE2均值〉1．60。结论瓷厚度、粘接剂色调和测色部位可影响瓷贴面修复体的最终颜色。HV＋3、WO和A3色调树脂粘接剂与相应试色糊剂存在一定颜色差别。

Objective To analyze the effect of ceramic materials thickness and resin cement shades on the final color of ceramic veneers in the discolored teeth, and to investigate the color agreement of try-in pastes to the corresponding resin cements. Methods Sixty artificial maxillary central incisor teeth （C2 shade） were used to simulate the natural discolored teeth and prepared according to veneer tooth preparation protocol. Veneers of different thickness in the body region （0.50 and 0.75 ram） were fabricated using ceramic materials （LT A2 shade, IPS e.max Press）. The ceramic veneer specimens were bonded to the artificial teeth using the 6 shades of resin cements （Variolink Veneer： shades of LV-3, LV-2, HV＋3; RelyXTM Veneer： shades of TR, A3, WO） （n=5）. A clinical spectrophotometer was used to measure the color parameters of ceramic veneers at the cervical, body and incisal regions. Color changes of veneers before and after cementation were calculated and registered as AE1, and the changes between try-in paste and the corresponding resin cements were registered as AE2. Results Three-way ANOVA indicated that AE1 and AE2 values were significantly affected by the ceramic thickness, resin cement shades and measuring regions （P〈0.05）. The AE1 values of six shades ranged from 0.59-8.27. The AE1 values were more than 2.72 when the ceramic veneers were cemented with resin cements in shades of HV＋3 and WO. The AE2 values of six shades ranged from 0.60-2.56. The shades of HV ＋ 3, WO and A3 resin cements were more than 1.60. Conclusions Different thickness of ceramic materials, resin cement shades and measuring regions could affect the final color of ceramic veneers. The color differences of some resin cements and corresponding try-in pastes might be observed in clinical practice.