School of Dentistry, Loma Linda University, Loma Linda, California, USA.
Private practice, São Paulo, Brazil.
Am J Dent. 2023 Oct;36(5):222-226.
To evaluate the capacity of highly opaque cements on masking titanium abutment background.
Dentin and titanium specimens were used to simulate respectively, a natural dental background and an implant abutment. To simulate the full-crowns, Y-TZP zirconia (ZC), lithium disilicate (LD), and resin composite (RC) blocks were used. The titanium specimens were divided into six cementation groups (n=10): two regular cements (BQM and RX); three opaque cements (MHA; VA and BHA); and a clear liquid (CL). The masking capacity of each cement was calculated as the color difference between the color of the crowns over dentin with clear liquid (reference) and the color of the crowns over the titanium with the different cements (ΔEab). Data were statistically analyzed using two-way ANOVA and Tukey test (α= 0.05).
Significant differences (P= 0.0001) were observed for both factors, cement and crown, and for the interactions between them. The results of Tukey test for cement were: BHA-2.25(0.98), MHA-2.94 (1.03), VA-3.45 (1.67), BQM-9.55 (2.77), RX-9.88 (3.12), CL-10.41 (3.47). The cements BHA, MHA and VA showed significantly smaller means than BQM, RX and CL. The results for crown were: ZC-3.66 (2.37), LD-7.50 (4.08), RC-8.08 (4.67). The means for all crown materials were significantly different. Highly opaque cements were more efficient on background masking than regular cements. Zirconia promoted the higher color masking while the resin composite the lowest.
The use of a highly opaque cement can reduce the color interference of the titanium abutment background, favoring the esthetic outcome of metal-free cemented crowns.
评估高不透明性水门汀对遮盖钛基台背景颜色的能力。
牙本质和钛标本分别模拟天然牙背景和种植基台。为了模拟全冠，使用氧化锆（ Y-TZP，ZC）、二硅酸锂（ lithium disilicate，LD）和树脂复合材料（ resin composite，RC）块。将钛标本分为六个粘结组（ n=10）：两种普通水门汀（ BQM 和 RX）；三种不透明水门汀（ MHA；VA 和 BHA）；和一种透明液体（ clear liquid，CL）。每种水门汀的遮盖能力计算为用透明液体（参考）覆盖牙本质上的冠的颜色与用不同水门汀覆盖钛上的冠的颜色之间的色差（ΔEab）。使用双向方差分析和 Tukey 检验（α=0.05）对数据进行统计分析。
水泥和冠这两个因素以及它们之间的相互作用均有显著差异（ P=0.0001）。Tukey 检验对水泥的结果为：BHA-2.25（0.98）、MHA-2.94（1.03）、VA-3.45（1.67）、BQM-9.55（2.77）、RX-9.88（3.12）、CL-10.41（3.47）。BHA、MHA 和 VA 三种水门汀的平均值明显小于 BQM、RX 和 CL。冠的结果为：ZC-3.66（2.37）、LD-7.50（4.08）、RC-8.08（4.67）。所有冠材料的平均值均有显著差异。高不透明性水门汀比普通水门汀更能有效遮盖背景颜色。氧化锆促进了更高的颜色遮盖，而树脂复合材料则最低。
使用高不透明性水门汀可减少钛基台背景颜色的干扰，有利于无金属粘结冠的美观效果。
