.  2022 Jun;26(2):84-93. 10.32542/implantology.2022007.

Effect of Indented Structures on the Retention of Cement-Retained Implant-Supported Crowns by Provisional Cement

• Choi JH
• Heo SJ
• Koak JY
• Kim SK
• Park JM
• Ahn JS

• KMID: 2531161
• DOI: http://doi.org/10.32542/implantology.2022007

Abstract

Purpose
The objective of this study was to investigate the effect of indented structures, such as dimples and retention groove formations, on the retention of titanium abutment walls when cementing cobalt-chromium (Co-Cr) alloy crowns with zinc oxide-eugenol cement.
Materials and Methods
Forty-eight titanium abutments (n = 6) were prepared, of which 24 abutments were 4.0 mm and the other 24 were 6.0 mm in height. These 4.0 mm and 6.0 mm abutments were organized into eight groups: no-dimple, 2-dimple, 4-dimple, and axial retention groove groups. The position and dimensions of the dimples and axial retention grooves were the same for all prepared abutments. Laser-sintered cobalt-chromium (Co-Cr) alloy crowns were cemented using a provisional cement. After thermocycling, a retention test was performed using a universal testing machine. Statistical analysis was performed using the nonparametric Kruskal– Wallis test and post-hoc Mann–Whitney U test (α = .05) to compare the mean retentive force.
Results
The lowest retentive force recorded was from the 4.0 mm no-dimple group (112.03 ± 20.30). Forming dimples and retention grooves increased the retentive force for the 4.0 mm groups, but the difference was not statistically significant (p > .05). A statistically significant difference was displayed by the 6.0 mm abutment with the 4-dimple group compared to the 6.0 mm no-dimple group (p < .05).
Conclusion
Within the limitations of this in vitro study, the mean retentive force was higher with dimples and axial retention grooves for 4.0 mm titanium abutments but was statistically insignificant (p > .05). An increase in abutment height was statistically correlated with an increase in retentive force within the same number of dimple-groups (p < .05).

Keyword

Dental implant; Implant abutment; Implant prosthesis; Retentive force