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Different Luting Agents Used in Retention of CAD/CAM All-Ceramic Crowns on Prefabricated Implant Abutments: An In
G Mahalakshmi1, Reddy Chaithanya1, Nibha Kumari Singh1
1Department of Prosthodontics, Government Dental College and Hospital, Vijayawada, Andhra Pradesh, India.
Background:
The long-term clinical success of computer-aided design and computer-aided manufacturing (CAD/CAM) all-ceramic crowns on prefabricated implant abutments largely depends on the selection of an appropriate luting agent. The choice of luting material influences the crown's retention, marginal adaptation, and overall performance.
Materials And Methods:
This in vivo comparative study was conducted on 30 patients requiring single-unit posterior implant-supported crowns. Patients were randomly divided into three groups (n = 10 each) based on the luting agent used: Group A: Self-adhesive resin cement, Group B: Glass ionomer cement, Group C: Resin-modified glass ionomer cement Standardized CAD/CAM lithium disilicate crowns were fabricated and cemented onto titanium prefabricated abutments. All crowns were evaluated at baseline and after 3, 6, and 12 months for retention, marginal integrity, and debonding events. The primary outcome was the retention force measured using a customized pull-out device calibrated in Newtons (N). Clinical performance and any technical complications were also noted.
Results:
At the 12-month follow-up, Group A (self-adhesive resin cement) showed the highest mean retention value (450 ± 25 N), followed by Group C (380 ± 30 N) and Group B (320 ± 28 N). Debonding was observed in 1 case in Group B and 1 case in Group C, while no debonding occurred in Group A. Statistical analysis using ANOVA demonstrated a significant difference in retention among the groups (P < 0.05). Marginal adaptation was satisfactory across all groups, with no biological complications recorded.
Conclusion:
Within the limitations of this in vivo study, self-adhesive resin cement demonstrated superior retention of CAD/CAM all-ceramic crowns on prefabricated implant abutments compared to glass ionomer and resin-modified glass ionomer cements.
