DOI: 10.4103/jisp.jisp_507_25 ISSN: 0972-124X

Influence of abutment design on the fit of computer-aided design and computer-aided manufacturing (CAD-CAM) fabricated lithium disilicate copings: An in vitro study

Leonardo Lins, Cristiana Licurci, Carolina Chaves Pinto, Cristiane Borsodi, Antonio Canabarro
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Abstract:

Background:

The fit of cement-retained implant restorations is important for prosthetic longevity and peri-implant health. This in vitro study evaluated and compared the internal and marginal fit of computer-aided design and computer-aided manufacturing (CAD/CAM) lithium disilicate copings (LDUCs) fabricated on three Cone Morse titanium abutment designs: anatomic, lateral anatomic, and universal.

Materials and Methods:

Thirty-six abutments ( n = 12 per design) were scanned, and LDUCs were fabricated using the Ceramill system. After standardized cementation, specimens were sectioned in buccal–palatal and mesial–distal directions. Internal gaps were measured microscopically at ×100 to ×200 magnification at angular, linear, and occlusal regions. Marginal adaptation was assessed as marginal discrepancy and absolute marginal discrepancy.

Results:

Statistically significant differences were observed among abutment designs ( P < 0.05). The anatomic design showed the smallest internal and marginal gaps, whereas the lateral anatomic and universal designs exhibited larger discrepancies, particularly in the occlusal and marginal areas. No significant laboratory effect was detected.

Conclusions:

Within the limitations of this in vitro study, abutment geometry significantly influenced the internal and marginal fit of CAD/CAM lithium disilicate restorations. The anatomic design demonstrated the most favorable adaptation among the evaluated groups. However, further in vivo investigations and randomized clinical trials are necessary to determine whether these laboratory findings translate into improved long-term clinical performance.

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