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. 2019 May;53(2):80-87.
doi: 10.26650/eor.20199657. Epub 2019 May 1.

Fracture resistance of different implant supported ceramic abutment/crown systems

Merve Bankoglu Gungor  1 , Secil Karakoca Nemli  1 , Handan Yilmaz  1 , Cemal Aydin  1
Affiliations

Fracture resistance of different implant supported ceramic abutment/crown systems

Merve Bankoglu Gungor et al. Eur Oral Res. 2019 May.

Abstract

Purpose: The purpose of this study was to investigate the fracture resistance and failure modes of different non-aged and aged abutment/crown systems.

Materials and methods: One hundred dental implants (diameter 4.3 mm and length 11.5 mm) were restored with five abutment/crown systems: G1: a lithium disilicate hybrid abutment crown, G2: a lithium disilicate crown cemented on a lithium disilicate hybrid abutment, G3: a lithium disilicate crown cemented on a zirconia hybrid abutment, G4: a direct veneer porcelain layering on a zirconia hybrid abutment, and G5: a lithium disilicate crown cemented on a prefabricated all-zirconia abutment. Each group was divided into two groups (n=10) as control (non-aged) and thermomechanically aged. The fracture resistance test was performed. Failures during the aging process and after the fracture resistance test were examined.

Results: Both of the factors (restoration type and aging) affected the fracture resistance values and there was not an interaction between the factors (p>0.05). When fracture resistance values were compared regardless of aging, the highest values were observed in G3 and G4, respectively (p<0.05). When comparing the fracture resistance values, regardless of the restoration type, the aged group showed a significant lower fracture resistance value than control group (p<0.05).

Conclusion: A titanium base enhanced the fracture resistance of zirconia abutments. Thermomechanical aging decreased the fracture resistance of the tested ceramic abutment/crown systems. The major failure mode was the abutment fracture.

Keywords: Dental implant; abutment design; ceramic; oYttria-stabilized; tetragonal zirconia polycrystals.

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Figures

Figure 1.
Figure 1.
Custom ceramic abutment A: Design of abutment B: Milled and crystallized lithium disilicate abutment.
Figure 2.
Figure 2.
Specimen positioned in universal testing machine.
Figure 3.
Figure 3.
Fracture resistance values of the tested groups *Group 1: Lithium disilicate hybrid abutment crown, Group 2: Lithium disilicate crown cemented on lithium disilicate hybrid abutment, Group 3: Lithium disilicate crown cemented on zirconia hybrid abutment, Group 4: Direct veneer porcelain layering on zirconia hybrid abutment, Group 5: Lithium disilicate crown cemented on prefabricated all-zirconia abutment.
Figure 4.
Figure 4.
Failure modes A: Crown fracture B:Abutment fracture C: Fracture of screw of titanium base D: Deformation of titanium base .
See this image and copyright information in PMC

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