Wang Feng, Monje Alberto, Huang Wei, Zhang Zhiyong, Wang Guomin, Wu Yiqun
Department of Oral Implantology, School of Medicine, Shanghai Key Laboratory of Stomatology, Ninth People's Hospital Affiliated with Shanghai Jiao Tong University, Shanghai, China.
Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, USA.
Clin Implant Dent Relat Res. 2016 Jun;18(3):571-9. doi: 10.1111/cid.12335. Epub 2015 Mar 23.
Maxillary overdentures have been utilized to restore oral function in scenarios where limited bone structure represents a drawback for financial issues and for cases where oral hygiene is uncertain.
The aim of this study was to evaluate the intermediate-term clinical outcome of four locator attachment retaining maxillary overdentures and to test their reliability.
A retrospective study was conducted from January 2007 to October 2013. After the placement of four maxillary dental implants and a healing period of approximately 3 months, all the implants were restored with locator-retained overdentures with partial palatal coverage. Subjects and implant characteristics, implant position (anterior vs posterior maxilla), bone quality, and opposing dentition were recorded. Peri-implant clinical parameters and marginal bone loss (MBL) were evaluated after delivery of the final prosthesis and annually thereafter. The performance of locator components and the prosthetic restoration were also recorded at follow-up.
A total of 104 implants were placed in 26 subjects (11 women, 15 men; mean age, 64 years; age range, 55-76 years). One implant failed before loading. One subject dropped out of the study during a mean follow-up period of 46 months (range: 7-73 months), achieving an overall survival rate of 95.2%. Clinical parameters revealed healthy tissues around most of the implants, with low scores of plaque and bleeding indices. At the last follow-up evaluation, the mean MBL was 1.7 ± 1.1 mm (0.4-2.6 mm). Regression model analysis indicated that MBL for implants in the posterior maxilla was significantly higher than that for implants in the anterior maxilla (p = .0487). Overall, 26 technical and prosthetic complications were reported.
Within the limitations of this study, maxillary four implant-retained overdentures via Locator attachment seem to be a predictable alternative for oral rehabilitation.
在上颌骨结构有限因经济问题成为障碍以及口腔卫生状况不确定的情况下，上颌覆盖义齿已被用于恢复口腔功能。
本研究的目的是评估四种Locator附着体固位的上颌覆盖义齿的中期临床效果，并测试其可靠性。
进行了一项回顾性研究，时间跨度为2007年1月至2013年10月。在植入四颗上颌牙种植体并经过约3个月的愈合期后，所有种植体均采用部分腭部覆盖的Locator附着体固位覆盖义齿进行修复。记录受试者和种植体特征、种植体位置（上颌前部与后部）、骨质量以及对颌牙列情况。在最终义齿交付后及此后每年评估种植体周围临床参数和边缘骨丢失（MBL）情况。随访时还记录Locator部件的性能和修复体情况。
共26名受试者（11名女性，15名男性；平均年龄64岁；年龄范围55 - 76岁）植入了104颗种植体。一颗种植体在加载前失败。一名受试者在平均46个月（范围：7 - 73个月）的随访期内退出研究，总体生存率为95.2%。临床参数显示大多数种植体周围组织健康，菌斑和出血指数得分较低。在最后一次随访评估时，平均MBL为1.7±1.1mm（0.4 - 2.6mm）。回归模型分析表明，上颌后部种植体的MBL显著高于上颌前部种植体（p = 0.0487）。总体而言，共报告了26例技术和修复并发症。
在本研究的局限性范围内，通过Locator附着体的上颌四颗种植体固位覆盖义齿似乎是口腔修复的一种可预测的替代方法。
