Effects of crown retrieval on implants and the surrounding bone: a finite element analysis|RISS 상세보기

다국어 초록 (Multilingual Abstract)

PURPOSE
The aim of this study was to observe stress concentration in the implant, the surrounding bone, and other components under the pull-out force during the crown removal.
MATERIALS AND METHODS
Two 3-dimensional models of implant-supported conventional metal ceramic crowns were digitally constructed. One model was designed as a vertically placed implant (3.7 mm × 10 mm) with a straight abutment, and the other model was designed as a 30-degree inclined implant (3.7 mm × 10 mm) with an angled abutment. A pull-out force of 40 N was applied to the crown. The stress values were calculated within the dental implant, the abutment, the abutment screw, and the surrounding bone.
RESULTS
The highest stress concentration was observed at the coronal portion of the straight implant (9.29 MPa). The stress concentrations at the cortical bone were lower than at the implants, and maximum stress concentration in bone structure was 1.73 MPa. At the abutment screws, the stress concentration levels were similiar (3.09 MPa and 3.44 MPa), but the localizations were different. The stress at the angled abutment was higher than the stress at the straight abutment.
CONCLUSION
The pull-out force, applied during a crown removal, did not show an evident effect in bone structure. The higher stress concentrations were mostly observed at the implant and the abutment collar. In addition, the abutment screw, which is the weakest part of an implant system, also showed stress concentrations. Implant angulation affected the stress concentration levels and localizations.
CLINICAL IMPLICATIONS
These results will help clinicians understand the mechanical behavior of cement-retained implant-supported crowns during crown retrieval.

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참고문헌 (Reference)

1 Michalakis K, "The effect of thermal cycling and air abrasion on cement failure loads of 4 provisional luting agentsused for the cementation of implant-supported fixed partial dentures" 22 : 569-574, 2007

2 Achour T, "Stress distribution in dental implant with elastomeric stress barrier" 32 : 282-290, 2011

3 Kayabaşı O, "Static, dynamic and fatigue behaviors of dental implant using finite element method" 37 : 649-658, 2006

4 Assenza B, "Screw- vs cement-implant-retained restorations: an experimental study in the Beagle. Part 1. Screw and abutment loosening" 31 : 242-246, 2005

5 Heinemann F, "Retrospective evaluation of temporary cemented, tooth and implant supported fixed partial dentures" 34 : 86-90, 2006

6 Worni A, "Retrievability of implant-supported crowns when using three different cements: a controlled clinical trial" 28 : 22-29, 2015

7 Mehl C, "Retrievability of implant-retained crowns following cementation" 19 : 1304-1311, 2008

8 Kokubo Y, "Retention of zirconia copings on zirconia implant abutments cemented with provisional luting agents" 37 : 48-53, 2010

9 Elias CN, "Relationship between surface properties (roughness, wettability and morphology)of titanium and dental implant removal torque" 1 : 234-242, 2008

10 Chaar MS, "Prosthetic outcome of cementretained implant-supported fixed dental restorations: a systematic review" 38 : 697-711, 2011