Graduate student, Advanced Graduate Education in Prosthodontics, Department of Restorative Dentistry and Biomaterials Sciences, Harvard School of Dental Medicine, Boston, Mass.
Associate Professor, Department of Restorative Dentistry and Biomaterial Sciences, Harvard School of Dental Medicine, Boston, Mass.
J Prosthet Dent. 2023 Oct;130(4):604.e1-604.e5. doi: 10.1016/j.prosdent.2023.07.034. Epub 2023 Aug 24.
Implant manufacturers have introduced titanium base (Ti-Base) abutments with increased abutment heights, ostensibly, to increase the retention of the bonded restoration and to improve overall strength. However, evidence regarding the effects of increasing Ti-Base height on improving retention is lacking.
The purpose of this in vitro study was to evaluate the effect of different Ti-Base abutment heights on the retention of zirconia implant-supported crowns.
Thirty Ti-Base abutments of the same diameter and heights of 3.5 mm (n=10), 4.5 mm (n=10), and 5.5 mm (n=10), were used for testing. Zirconia restorations were cemented onto the Ti-Base abutments with a resin cement after treatment with a 10-methacryloyloxydecyl dihydrogen phosphate primer by a single operator using a positioning device. The zirconia-Ti-Base restorations were tightened to an implant analog embedded in an autopolymerizing resin block. The specimens were placed and tested in a universal testing machine for pull-out testing. Retention was measured by recording the force at load drop. Statistical analysis was performed using 1-way analysis of variance with the Tukey method for pairwise comparisons.
The abutment height had a significant effect on retention (P=.010). Ti-Base abutments of 4.5 and 5.5 mm had significantly greater retention than Ti-Base abutments of 3.5 mm (P=.020, P=.040, respectively). However, Ti-Base abutments of 4.5 and 5.5 mm in height were statistically similar (P=.890).
An increase in the height of Ti-Base abutments above the standard 3.5 mm height significantly improved the retention of the overlying restoration.
植入物制造商推出了具有增加的基台高度的钛基（Ti-Base）基台，表面上是为了增加粘结修复体的固位力并提高整体强度。然而，关于增加 Ti-Base 高度对提高固位力的影响的证据尚缺乏。
本体外研究的目的是评估不同 Ti-Base 基台高度对氧化锆种植体支持的牙冠固位力的影响。
共使用了 30 个直径相同且高度分别为 3.5mm（n=10）、4.5mm（n=10）和 5.5mm（n=10）的 Ti-Base 基台进行测试。在使用定位装置由单个操作人员用 10-甲丙烯酰氧基癸基二氢磷酸酯底漆处理后，将氧化锆修复体粘结到 Ti-Base 基台上。将氧化锆-Ti-Base 修复体拧紧到嵌入自聚合树脂块中的种植体模拟体上。将标本放置在万能试验机中进行拔出测试。通过记录力的下降来测量固位力。采用单因素方差分析和 Tukey 法进行两两比较进行统计学分析。
基台高度对固位力有显著影响（P=.010）。4.5mm 和 5.5mm 高度的 Ti-Base 基台的固位力显著大于 3.5mm 高度的 Ti-Base 基台（P=.020，P=.040）。然而，4.5mm 和 5.5mm 高度的 Ti-Base 基台在统计学上相似（P=.890）。
超过标准 3.5mm 高度的 Ti-Base 基台高度的增加显著提高了覆盖修复体的固位力。
