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purpose: The main disadvantage of cement-retained implant restorations is their difficulty in retrievability. Therefore, retrievability of the restoration can be maintained if provisional cement is used. The aim of this study is to evaluate bond strength durability of cement retained implantsupported restorations using three different interim luting agents in-an in vitro condition. materials and methods: Sixty standard titanium abutments were tightened to implant analogs. The implant-abutment complex was embedded vertically in auto-polymerizing acrylic resin block. Metal copings with a loop on the occlusal surface were fabricated using nickel chromium (Ni-Cr) alloy. The copings were luted using provisional cement. According to type of cement, specimens were equally divided into three groups: Provilat calcium hydroxide cement (group A), Rely x Temp NE (group B), Cavex temp NE (group C). Each group was equally sub-divided into two subgroups according to storage condition before tensile testing: subgroup 1: specimens were stored in distilled water for 24 hours at 37 ̊C, subgroup 2: specimens were stored as subgroup 1 and then subjected to thermocycling and mechanical loading (5000 cycle, 5-55oC, 30-s dwell time, 20s transfer time). Specimens were tested for tensile bond strength using universal testing machine at across head speed of 0.5 mm/min. Tensile failure of the copings were recorded in Newton. Samples were examined under digital microscope to detect the mode of failure. Results were statistically analyzed by ANOVA test (P<0.05). results: For short-term water storage, cement failure loads of subgroups A1, B1 and C1 were 112.9±27.2, 54.6±13.2 and 58.6±20.8N, respectively. Subjecting the specimens to short-term water storage in addition to thermocycling and mechanical loading corresponding to 6 month of clinical use has led to significant loss of retentive values (subgroups A2, B2 and C2 were 74.1±18.2, 52.4±24.6 and 46.5±18.3 N, respectively). conclusions: Provilat cement has the best retention results. Calcium hydroxide based provisional luting agent seems to be more appropriate for the cementation of implant supported restoration, if retrievability is important Keyword: Implants, Titanium abutment, Luting cement, Tensile bonding. (1438) Mohamed Ramadan, et al. E.D.J. Vol. 62, No. 2

IN VITRO EVALUATION OF BONDING DURABILITY OF CEMENT-RETAINED IMPLANT-SUPPORTED RESTORATIONS USING THREE DIFFERENT INTERIM LUTING AGENTS