Influence of abutment height and convergence angle on the retrievability of cement-retained implant prostheses with a lingual slot
The Journal of Advanced Prosthodontics
;
: 381-387, 2018.
Article
in English
| WPRIM
| ID: wpr-742053
ABSTRACT
PURPOSE:
Cement-retained implant prostheses can lack proper retrievability during repair, and residual cement can cause peri-implantitis. The purpose of this in vitro study was to evaluate the influence of abutment height and convergence angle on the retrievability of cement-retained implant prostheses with lingual slots, known as retrievable cement-type slots (RCS). MATERIALS ANDMETHODS:
We fabricated six types of titanium abutments (10 of each type) with two different heights (4 mm and 6 mm), three different convergence angles (8°, 10°, and 12°), a sloped shoulder margin (0.6 mm depth), a rectangular shape (6 mm × 6.5 mm) with rounded edges, and a rectangular ledge (2 mm × 1 mm) for the RCS. One monolithic zirconia crown was fabricated for each abutment using a dental computer-aided design/computer-aided manufacturing system. The abutments and crowns were permanently cemented together with dual-curing resin cement, followed by 24 hours in demineralized water at room temperature. Using a custom-made device with a slot driver and torque gauge, we recorded the torque (N·cm) required to remove the crowns. Statistical analysis was conducted using multiple regression analysis and Mann-Whitney U tests (α=.05).RESULTS:
Removal torques significantly decreased as convergence angles increased. Multiple regression analysis showed no significant interaction between the abutment height and the convergence angle (Durbin-Watson ratio 2.186).CONCLUSION:
Within the limitations of this in vitro study, we suggest that the retrievability of cement-retained implant prostheses with RCS can be maintained by adjusting the abutment height and convergence angle, even when they are permanently cemented together.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Prostheses and Implants
/
Shoulder
/
Titanium
/
In Vitro Techniques
/
Water
/
Resin Cements
/
Torque
/
Crowns
/
Peri-Implantitis
Language:
English
Journal:
The Journal of Advanced Prosthodontics
Year:
2018
Type:
Article
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