Statement of problem

Implant-supported prostheses have typically been retained by cement or screws, each of which has advantages and disadvantages. Two new types of prosthesis with complementary advantages and disadvantages have been proposed: the screw- and cement-retained prosthesis, which combines cement and screw retention, and the antiloosening inner-post screw (ALIPS) type, which uses lateral screws. Both esthetic and functional factors should be considered for anterior prostheses; however, clinical studies of the complication rates of these designs are lacking.

Purpose

The purpose of this retrospective clinical study was to evaluate the complications of dental implant-supported restorations with various prosthetic types in the anterior region and to analyze other factors that affect complications.

Material and methods

This study included 51 patients who had 83 implants placed in the anterior region by a single clinician between August 2009 and December 2016. Surgical and prosthetic features were recorded, and implant complications were analyzed.

Results

There were 45 (55.4%) cement-retained implants, 5 (6.0%) screw- and cement-retained prosthesis implants, and 32 (38.6%) ALIPS-retained implants. Peri-implant mucositis was observed most frequently in the ALIPS type (21.9%), but the biological complications did not differ significantly with the prosthetic type. The most common mechanical complication was loss of retention in the cement type of prosthesis (30.4%) and screw loosening in the ALIPS type (43.8%). Implant complications varied with position (maxilla or mandible) and implantation timing (period from tooth extraction to implant placement).

Conclusions

The complications of implants placed in the anterior region were affected by different factors but did not differ significantly with the type of the retention.

中文翻译：

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前植入物支持的假体中各种保留类型的并发症发生率：一项回顾性临床研究

问题陈述

植入物支撑的假体通常由水泥或螺钉固定，每种都有优点和缺点。已经提出了两种具有互补优势和劣势的新型假体：结合了骨水泥和螺钉固位的螺钉固定和水泥固定假体，以及使用侧向螺钉的防松内柱螺钉（ALIPS）型。假体应考虑美学和功能因素。然而，缺乏对这些设计的并发症发生率的临床研究。

目的

这项回顾性临床研究的目的是评估前牙区域各种假体支持的牙种植体支持的修复体的并发症，并分析影响并发症的其他因素。

材料与方法

该研究纳入了2009年8月至2016年12月之间由一位临床医生在前区放置83个植入物的51例患者。记录了手术和修复特征，并对植入物并发症进行了分析。

结果

有45个（55.4％）水泥固定植入物，5个（6.0％）螺钉和水泥固定假体植入物和32个（38.6％）ALIPS固定植入物。ALIPS类型的假体周围粘膜炎最常见（21.9％），但假体类型的生物学并发症无明显差异。最常见的机械并发症是假体水泥类型的固位力丧失（30.4％）和ALIPS类型的螺丝松动（43.8％）。植入物并发症随位置（上颌骨或下颌骨）和植入时机（从拔牙到植入物放置的时间）而异。

结论

放置在前部区域的植入物的并发症受不同因素的影响，但在保留类型上没有显着差异。