Journal of Dental Implants
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ORIGINAL ARTICLE
Year : 2015  |  Volume : 5  |  Issue : 1  |  Page : 25-30

Removal force of cast copings to abutments with three luting agents


Department of Oral Implantology, School of Dentistry, Cayetano Heredia University, Lima, Peru

Correspondence Address:
Frank R Mayta-Tovalino
Department of Oral Implantology, School of Dentistry, Cayetano Heredia University, Lima
Peru
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0974-6781.154426

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Purpose: The purpose of this study was to evaluate the removal force of cast copings over abutments cemented with 3 dental cements. Methods: The experiment used 36 abutments divided into six groups (n = 6) Cast copings with CeraOne cemented with zinc oxide-free eugenol; with glass ionomer; with zinc phosphate and solid 5-mm-high abutments cemented with the same cements wax loops (3 mm in diameter) were made and added to the occlusal surface to allow for tensile testing, and the copings were cast in cobalt-chromium alloy using the lost wax method. The copings were sandblasted with 50-μm aluminum oxide particles to prevent irregularities and cleaned with acetone. The copings were cemented with a 49-N load for 10 min. Subsequently, they were separated with a universal testing machine (Tensometer; Monsanto) at a rate of 5 mm/min until the detachment. The effects of cement and abutment type were evaluated using the means and standard deviations of the loads and were analyzed with ANOVA and the Tukey test (α =0.05). Results: The abutments with a height of 5.5 mm had a statistically significant (P < 0.001) higher tensile strength with a mean of 84.60 N (±8.82) than that of the CeraOne abutments with an average of 36.09 N (±11.66) when cemented with zinc oxide. Conclusions: We conclude that the type of cement and abutment can significantly influence the retention of implant-supported crowns. The results do not suggest that any one type of cement is better than another, but they rank cements in order of retention capacity. Zinc phosphate provided the greatest retention while the eugenol-free zinc oxide provided the least (P < 0.001).


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