Clinical evaluation of an improved cementation technique for implant-supported restorations: a randomized controlled trial
Clinical evaluation of an improved cementation technique for implant-supported restorations: a randomized controlled trial
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DOI：
10.1111/clr.12589
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发表时间：
2016-12-01
影响因子：
4.3
通讯作者：
Loi, Ignazio
中科院分区：
文献类型：
--
作者：
Canullo, Luigi;Cocchetto, Roberto;Loi, Ignazio
背景：骨水泥残留物经常与种植体周围炎相关。最近，提出了无肩基台，引起了人们对骨水泥过度去除的担忧。目的：比较种植体支持修复体的不同粘接技术，评估种植体周围沟中的粘接剂残留量。其他目的是比较使用两种不同基台设计的这些粘接技术的效果。 材料和方法：46 名需要在上颌后部进行双种植体支持修复的患者根据粘接方式随机分为两组：口内和口外。根据基台精加工线，每位患者的种植体被随机分配至无肩组或倒角组。在口内组中，牙冠直接固定在钛基台上。在口外组中，首先将牙冠固定在树脂基台复制品上并立即取出，然后清除多余的水泥，最后将牙冠固定在钛基台上。骨水泥凝固后，两组中都仔细尝试去除多余的骨水泥。三个月后，框架/基台复合体被断开并准备进行微观分析：测量暴露的水泥残余物和边缘间隙所占据的表面。此外，研磨牙冠/基台复合体，并测量基台/牙冠界面处的水泥空隙。相关样本弗里德曼的双向方差分析用于检测组和亚组之间的差异（P
Background: Cement remnants were frequently associated with peri-implantitis. Recently, a shoulderless abutment was proposed, raising some concern about cement excess removal. Aim: To compare different cementation techniques for implant-supported restorations assessing the amount of cement remnants in the peri-implant sulcus. Additional aim was to compare the effect of these cementation techniques using two different abutment designs.Material & methods: Forty-six patients requiring double implant-supported restoration in the posterior maxilla were randomly divided in two groups according to the cementation modality: intraoral and extraoral. According to the abutment finishing line, implants in each patient were randomly assigned to shoulderless or chamfer subgroup. In the intraoral group, crowns were directly seated onto the titanium abutment. In the extraoral group, crowns were firstly seated onto a resin abutment replica and immediately removed, then cleansed of the cement excess and finally seated on the titanium abutment. After cement setting, in both groups, cement excess was carefully tried to remove. Three months later, framework/abutment complexes were disconnected and prepared for microscopic analysis: surface occupied by exposed cement remnants and marginal gaps were measured. Additionally, crown/abutment complexes were grinded, and voids of cement were measured at abutment/crown interface. Related-samples Friedman's two-way analysis of variance by ranks was used to detect differences between groups and subgroups (P