Au A R, Lechner S K, Thomas C J, Mori T, Chung P
Faculty of Dentistry, University of Sydney, Australia.
J Oral Rehabil. 2000 Nov;27(11):979-85. doi: 10.1046/j.1365-2842.2000.00576.x.
This study examined the success of titanium (Ti) removable partial dentures (RPDs) compared with that of cobalt-chromium (Co-Cr) RPDs using a randomized controlled clinical trial. Thirty-eight RPD patients were provided with either Co-Cr (20 patients) or Ti (18 patients) RPDs. The total numbers of dentures was 31 (13 maxillary, 18 mandibular) for Co-Cr and 23 (11 maxillary, 12 mandibular) for Ti. Patients were reviewed for 24 months following denture issue. After the initial 12 months, 20 clinical problems were recorded and became the criteria for subsequent assessment. Incidence of failure was analysed using both Fisher's exact test and the chi square test at a significance level of P<0.05. Fracture of retainers in both metals occurred only in the first 12 months. Some failure types presented at significantly higher levels in the first 12 months but there were no significant differences between the two in all the criteria examined between the 12- and the 24-month reviews. Although differences existed in failure types between Co-Cr and Ti RPDs during the early review stages, the overall success rate of Ti RPDs was comparable with that of Co-Cr RPDs after 24 months. The higher incidence of failures in Ti RPDs prior to the 12-month review suggests the importance of taking its lower rigidity into account when designing RPDs.
本研究采用随机对照临床试验，比较了钛（Ti）可摘局部义齿（RPD）与钴铬（Co-Cr）可摘局部义齿的成功率。38例RPD患者分别佩戴Co-Cr（20例患者）或Ti（18例患者）可摘局部义齿。Co-Cr组义齿总数为31副（上颌13副，下颌18副），Ti组为23副（上颌11副，下颌12副）。义齿佩戴后对患者进行了24个月的随访。在最初的12个月后，记录了20个临床问题，并将其作为后续评估的标准。采用Fisher精确检验和卡方检验分析失败发生率，显著性水平为P<0.05。两种金属固位体的折断仅发生在前12个月。在最初的12个月中，某些失败类型的发生率显著较高，但在12个月和24个月复查时所检查的所有标准中，两组之间均无显著差异。尽管在早期复查阶段Co-Cr和Ti可摘局部义齿的失败类型存在差异，但24个月后Ti可摘局部义齿的总体成功率与Co-Cr可摘局部义齿相当。Ti可摘局部义齿在12个月复查前失败发生率较高，这表明在设计可摘局部义齿时考虑其较低的刚性很重要。
