种植体上水泥和螺钉固位全瓷单冠的机械性能。

Mechanical performance of cement- and screw-retained all-ceramic single crowns on dental implants.

机构信息

Private Practice for Oral and Maxillofacial Surgery Professor Paulus, Arabellastraße 15, Munich, 81925, Germany.

Department of Oral and Maxillofacial Surgery, University Hospital Heidelberg, Im Neuenheimer Feld 400, 69120, Heidelberg, Germany.

出版信息

Clin Oral Investig. 2018 Mar;22(2):981-991. doi: 10.1007/s00784-017-2178-z. Epub 2017 Jul 15.

DOI:10.1007/s00784-017-2178-z

PMID:28710653

Abstract

OBJECTIVES

This in-vitro study was performed to compare the contact wear, fracture strength and failure mode of implant-supported all-ceramic single crowns manufactured with various fabrication and fixation concepts.

MATERIALS AND METHODS

Fifty dental implants (Conelog Ø 4,3mm/L11mm, Camlog Biotechnologies AG) were embedded and treated with all-ceramic molar single-crowns. Three groups received hand-layered zirconia crowns (IPS e.max Ceram/ IPS e.max ZirCAD, Ivoclar Vivadent AG): CZL (cement-retained zirconia-based layered) group crowns were cemented conventionally, SZL (screw-retained zirconia-based layered) group crowns were screw-retained, MZL (modified zirconia-based layered) group crowns showed a different coping design with screw retention. The specimens of SST (screw-retained sintering-technique) and SFL (screw-retained full-contour lithium-disilicate) group were CAD/CAM (Computer-aided design/computer-aided manufacturing) fabricated in the sintering technique (IPS e.max ZirCAD/IPS e.max CAD, Ivoclar Vivadent AG) and full-contour of lithium disilicate (IPS e.max CAD, Ivoclar Vivadent AG) respectively and screw-retained. All specimens underwent artificial aging, load until failure and a scanning electron microscopy (SEM) analysis. The received data were statistically compared (one-way ANOVA; Student-Newman-Keuls test; Mann-Whitney U-test) at a significance level of 5%.

RESULTS

Mouth-motion fatigue testing caused two abutment fractures (SST group and SZL group) and two chipping events (CZL group). Specimens of MZL group showed statistically significant less contact wear compared to the other groups (p<0.001). There was no statistical difference between the groups in terms of the maximum fracture load. SEM-analysis showed a more homogenous structure and surface of CAD/CAM fabricated specimens towards manually veneered components.

CONCLUSIONS

The mode of retention did not influence the fracture resistance but the failure patterns of the specimens. CAD/CAM milled lithium-disilicate crowns seemed to be a preserving factor for dental implants.

CLINICAL RELEVANCE

The mode of retention and veneering influences the mechanical performance of implant-supported single crowns.

摘要

目的

本体外研究比较了不同制作和固定概念制造的种植体支持全瓷单冠的接触磨损、断裂强度和失效模式。

材料和方法

将 50 颗牙科植入物（Conelog Ø 4.3mm/L11mm，Camlog Biotechnologies AG）嵌入并处理成全瓷磨牙单冠。三组接受手工分层氧化锆冠（IPS e.max Ceram/IPS e.max ZirCAD，Ivoclar Vivadent AG）：CZL（粘结固位氧化锆基分层）组冠常规粘结，SZL（螺钉固位氧化锆基分层）组冠螺钉固位，MZL（改良氧化锆基分层）组冠具有不同的罩面设计，螺钉固位。SST（螺钉固位烧结技术）和 SFL（螺钉固位全轮廓锂硅玻璃陶瓷）组的试件采用 CAD/CAM（计算机辅助设计/计算机辅助制造）在烧结技术（IPS e.max ZirCAD/IPS e.max CAD，Ivoclar Vivadent AG）和全轮廓锂硅玻璃陶瓷（IPS e.max CAD，Ivoclar Vivadent AG）中制作，并采用螺钉固位。所有试件均进行人工老化、直至失效的负载和扫描电子显微镜（SEM）分析。对所得数据进行统计学比较（单向方差分析；Student-Newman-Keuls 检验；Mann-Whitney U 检验），显著水平为 5%。