Statement of problem: Due to the conflicting results in literature, it is not clear which luting agent is suitable for implant retained fixed restorations in different clinical situations.
Purpose: The purpose of this study was to compare the retention of single crowns on implant direct abutments cemented with different conventional luting agents.
Materials and methods: The study included 98 single crowns cemented with seven luting agents on to the abutments. Sandblasting was used as surface treatment. After cementation thermocycling was applied. The uniaxial tensile force was applied to all test crowns using universal test machine (Instron) at 0.5 mm/min. The load required to dislodge each crown was recorded in Newton. Means and standart deviations of loads at failure were analyzed using ANOVA. Statistical significance was set at (p < 0.05).
Results: There were statistically significant differences among the groups for each luting agents (p < 0.05). Using adhesive resins (Panavia F 2.0) showed higher bond strength values in both sandblasted and nonblasted groups. The weakest bond strength values were obtained by using temporary luting agent (Cavex temporary cement).
Conclusions: Within limitations of this study it can be said that when strong retention is necessary for implant-retained prosthesis, adhesive resin system is more retentive than zinc phosphate and zinc polycarboxylate. If the restoration needs retriavibilty, noneugenol temporary luting agent can be offered.
Clinical Implications: Retentiveness of implant-retained fixed restorations is related not only to surface characteristics of abutment and crown but also to luting agents.
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