Al Wazzan Khalid A, Al-Nazzawi Ahmad A
Department of Prosthetic Dental Sciences, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.
J Contemp Dent Pract. 2007 Jan 1;8(1):19-26.
The purpose of this in vitro study was to investigate the marginal accuracy and internal fit of complete cast crowns and three-unit fixed partial dentures (FPDs) cast with commercially pure titanium (CPTi) and Titanium-Aluminum-Vanadium alloy (Ti-6Al-4V).
CPTi and Ti-6Al-4V alloy were used to cast twelve single crowns and twelve three-unit FPDs. A traveling microscope was used to measure marginal gap and discrepancies in internal fit. Two and one-way analysis of variance (ANOVA) analyses were used to determine the effects of the marginal and internal fit discrepancies.
The Ti-6Al-4V alloy demonstrated a significantly smaller marginal gap than CPTi (P<0.0001). The recorded marginal discrepancies for both metals were within a clinically accepted range (<100 microm). The single crown fit discrepancy was significantly smaller than the three-unit FPD for both the CPTi and the Ti-6Al-4V alloy (P<0.0001). For the internal fit discrepancy, the occlusal surface showed the greatest gaps.
The Ti-6Al-4V alloy demonstrated a better fit than CPTi. Single crowns showed an improved fit when compared with the three-unit FPD. Mid-occlusal internal gap demonstrated greater values than the axial internal gap.
This in vitro study suggested marginal fit of complete crowns and three-unit FPDs cast by CPTi or Ti-6Al-4V alloy were within the range of what is clinically acceptable for longevity of restorations.
本体外研究旨在调查用商业纯钛（CPTi）和钛铝钒合金（Ti-6Al-4V）铸造的全冠和三单位固定局部义齿（FPD）的边缘适合性和内部适合性。
使用CPTi和Ti-6Al-4V合金铸造12个单冠和12个三单位FPD。用移动显微镜测量边缘间隙和内部适合性差异。采用双因素和单因素方差分析（ANOVA）来确定边缘和内部适合性差异的影响。
Ti-6Al-4V合金的边缘间隙明显小于CPTi（P<0.0001）。两种金属记录的边缘差异均在临床可接受范围内（<100微米）。对于CPTi和Ti-6Al-4V合金，单冠的适合性差异均明显小于三单位FPD（P<0.0001）。对于内部适合性差异，咬合面的间隙最大。
Ti-6Al-4V合金的适合性优于CPTi。与三单位FPD相比，单冠显示出更好的适合性。咬合面中部的内部间隙值大于轴向内部间隙。
本体外研究表明，由CPTi或Ti-6Al-4V合金铸造的全冠和三单位FPD的边缘适合性在修复体长期使用的临床可接受范围内。
