|
KMID : 0362420150530040345
|
|
Journal of Korean Academy of Prosthodontics
2015 Volume.53 No. 4 p.345 ~ p.351
|
|
|
Axial wall thickness of zirconia abutment in anterior region
|
|
Moon Seung-Jin
Heo Yu-Ri
Lee Gyeong-Je
Kim Hee-Jung
|
|
|
Abstract
|
|
|
Purpose: The purpose of this study was to evaluate the proper axial thickness of zirconia abutment applied to implant in the anterior region.
Materials and methods: Zirconia abutments were prepared at different axial wall thickness by processing pre-sintered zirconia blocks via CAD/CAM to obtain equal specimens. The abutments were each produced with a thickness of 0.5 mm (Group 1), 0.8 mm (Group 2), 1.2 mm (Group 3), or 1.5 mm (Group 4). The implant used in this study was a external connection type one (US, Osstem, Pussan, Korea) product and the zirconia abutment was prepared via replication of a cemented abutment. The crowns were prepared via CAM/CAM with a thickness of 1.5 mm and were cemented to the abutments using RelyXTM UniCem cement. A universal testing machine was used to apply load at 30 degrees and measure fracture strength of the zirconia abutment.
Results: Fracture strength of the abutments for Group 1, Group 2, Group 3, and Group 4 were 236.00 ± 67.55 N, 599.00 ± 15.80 N, 588.20 ± 33.18 N, and 97.83 ± 98.13 N, respectively. Group 1 showed a significantly lower value, as compared to the other groups (independent Mann-Whitney U-test. P<.05). No significant differences were detected among Group 2, Group 3, and Group 4 (independent Mann-Whitney U-test. P>.05).
Conclusion: Zirconia abutment requires optimal thickness for fracture resistance. Within the limitation of this study, > 0.8 mm thickness is recommended for zirconia abutment in anterior implants.
|
|
|
KEYWORD
|
|
|
Zirconia abutment, Fracture strength, Axial wall thickness
|
|
|
FullTexts / Linksout information
|
|
|
|
|
Listed journal information
|
|
 
|
|