目的 评估上釉对B、C色系IPS e.max LT底层材料相对透明率的影响。方法 制备IPS e.max LT盘状底层材料试样,厚度分别为0.3 mm和0.5 mm,按色号分为B1、B2、B3、B4、C1、C2、C3、C4组,共16组,每组5个。分别在其表面涂饰颜色与底层材料相同的牙本质瓷,涂饰瓷层厚度均保持为0.3 mm。然后在所制备的试样表面上釉瓷,放置于铸瓷炉内高温烧结。在试样上釉前后,分别使用分光测色计对其相对透明率进行测定,统计学分析。结果 B、C色系底层材料在上釉前后,底层材料的厚度对相对透明率有显著性影响(P<0.05),相同颜色的0.6 mm组试样的相对透明率在上釉前后均低于0.8 mm组(P<0.05),B色系底层材料上釉对于0.6 mm组相对透明率差异有统计学意义(P<0.05),上釉后各组相对透明率下降。除了B4组外B色系底层材料上釉对于0.8 mm试样组的相对透明率差异无统计学意义。对于C色系,除了C3组外,上釉对于0.6 mm厚度的试样相对透明率差异有统计学意义(P<0.05),上釉前各组相对透明率均大于上釉后。而对0.8 mm厚度的底层材料C1组和C4组上釉对于相对透明率差异有统计学意义(P<0.05),而C2和C3组则差异无统计学意义。结论 合理调节瓷层的总厚度,控制底层材料和饰瓷的厚度比,利于全瓷修复体与天然牙的颜色和相对透明率的匹配;通过上釉能够提高全瓷修复体的透明度,改善其美学效果。
Abstract
Objective To evaluate the effect of glaze on relative translucency of B, C color IPS e.max LT core material.Methods Disc-shaped base material IPS e.max LT samples which were 0.3mm and 0.5 mm thick were prepared and divided into eight groups by color number B1, B2, B3, B4, C1, C2, C3, C4, n=5. 0.3 mm-thick dentin porcelain of the same color as the base material was decorated over the surface. Finally, all the samples were glazed and sintered. Relative translucency was determined using a spectral colorimeter and statistically analyzed.Results Analysis results of samples of color B and C showed that thickness was a significant factor for their relative translucency (P<0.05). Using the same color, relative translucency of 0.8 mm groups was higher than that of 0.6 mm group (P<0.05). For samples of 0.6 mm, glazing with color B significantly decreased relative translucency (P<0.05), but had no significant effect on samples of 0.8 mm (P>0.05)except group B4. For color C, glazing had a significant effect on relative translucence of groups of 0.6 mm excepted C3 groups (P<0.05). For groups of 0.8 mm, glazing showed significant effect on C1 and C4 (P<0.05), but not on C2 and C3 (P>0.05).Conclusions The thickness ratio of core materials to dentine porcelain contributes to match color and relative translucency between all-ceramic restoration and natural teeth. Glaze can improve the transparency of all-ceramic restorations their aesthetic effect.
关键词
牙本质瓷 /
色系 /
相对透明率 /
上釉
Key words
dentine porcelain /
color series /
relative translucency /
glaze
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