Effect of Preseating, Screw Access Opening, and Vent Holes on Extrusion of Excess Cement at the Crown-Abutment Margin and Associated Tensile Force for Cement-Retained Implant Restorations
Effect of Preseating, Screw Access Opening, and Vent Holes on Extrusion of Excess Cement at the Crown-Abutment Margin and Associated Tensile Force for Cement-Retained Implant Restorations
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DOI：
10.11607/jomi.4143
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发表时间：
2016-07-01
影响因子：
2
通讯作者：
Vargas-Koudriavtsev, Tatiana
中科院分区：
文献类型：
--
作者：
Jimenez, Rodrigo A.;Vargas-Koudriavtsev, Tatiana
目的：本研究旨在（1）比较粘结前牙冠预座的影响，（2）确定钛基台上的螺钉进入开口和铸造牙冠上的开放通气孔的维护是否会影响牙冠-基台边缘的多余粘结剂量，以及（3）分析粘结后的相关张力。材料与方法：测试了三个独立变量：（1）基台螺钉入路（打开或关闭），（2）牙冠内冠改良（在腭侧有或没有通气孔），（3）基台替代体上的牙冠预座。对于三个独立变量的每种组合，在10个直型种植体基台上使用临时骨水泥固定10个种植体冠帽。通过重量测量牙冠边缘的多余骨水泥量。在骨水泥固定后24小时测量轴向拉伸载荷。使用线性回归和单变量三因素方差分析（α = 0.05）对结果进行统计学分析。结果如下：开放螺钉入路、牙冠上存在通气孔和牙冠预座对牙冠边缘多余的粘固剂量有显著影响（P <0.05）。预位显著降低了抗张强度值（P = .001），特别是在预位和开放螺钉进入的样本中（P < .001）。边缘处的过量骨水泥与抗拉强度值之间无显著相关性。结论：可以考虑在牙冠上放置通气孔或开放螺钉通路，以便使用临时骨水泥将牙冠固定在种植体基台上，从而最大限度地减少牙冠边缘的多余骨水泥。无论是单独使用还是与开放螺钉联合使用，预拔方案都是不可取的，因为它会显著降低骨水泥固定的固位强度（P <0.001）。
Purpose: This study sought to (1) compare the effects of crown preseating prior to cementation, (2) determine whether maintenance of screw access openings on titanium abutments and open vent holes on cast crowns affects the amount of excess cement at the crown-abutment margin, and (3) analyze the associated tensile force after cementation. Materials and Methods: Three independent variables were tested: (1) abutment screw access (open or closed), (2) crown coping modification (with or without a vent hole in the palatal aspect), and (3) crown preseating on an abutment analog. Ten implant crown copings were cemented using temporary cement on ten straight implant abutments for each combination of the three independent variables. The amount of excess cement at the crown margins was measured by weight. Axial tensile load was measured 24 hours after cementation. Results were statistically analyzed using linear regression and univariate three-way analysis of variance (alpha = .05). Results: Open screw access, presence of a vent hole on the crown, and preseating of the crown had significant effects on the amount of excess cement at the crown margin (P < .05). Preseating significantly lowered tensile strength values (P = .001), particularly in specimens with preseating and open screw access (P < .001). There was no significant correlation between excess cement at the margins and tensile strength values. Conclusion: Placement of vent holes on the crown or open screw access may be considered for cementing crowns on implant abutments using temporary cement in order to minimize excess cement at the crown margin. A preseating protocol is not advisable, either alone or combined with open screw access, since it significantly reduces the retentive strength of cemented restorations (P < .001).