Retention of any prosthesis is affected by height and taper. Many practitioners use temporary cements for the cementation of implant supported prosthesis. Objective: To determine the effect of height and taper on the tensile strength needed to dislodge Al2O3 copings luted to titanium abutments using two different provisional cements. Methods: Four titanium abutments were fabricated using ProceraŽ CAD/CAM system, sample A- 8mm height / 8° taper, B- 8mm height / 3.9° taper, C- 4mm height / 8° taper, and D- 4mm height / 3.9° taper. Al2O3 copings were cemented with Temp BondŽ and Improv^TM. Samples were stored in 100% humidity for 24 hours prior to applying tensile force until dislodgement. Results: Removal forces were: Temp BondŽ cement: Sample A- 13.7 kg (SD 2.2 kg), sample B- 11.16 kg (SD 2.2 kg), sample C- 6.85 kg (SD 1.8 kg), Sample D- 4.07 kg (SD 0.35 kg). Improv^TM cement: Sample A-20.6 kg (SD 4.2 kg), sample B- 15.67 kg (SD 5.0 kg), sample C- 9.22 kg (SD 1.9 kg), Sample D- 8.3 kg (SD 3.3 kg). A two-way ANOVA test revealed a statistically significant difference between: sample A and B (p=0.04), sample C and D (p=0.01), sample A and C (p=0.003), and sample B and D (p=0.001) when cemented with Temp BondŽ. With Improv^TM, no significant difference was seen between sample A and B (p=0.03), sample C and D (p=0.30). A significant difference occured between sample A and C (p=0.007), and between sample B and D (p=0.01). Comparing both cements, the largest difference was (p=0.008) between abutment A Improv^TM (20.6 kg) and the same abutment cemented with Temp BondŽ (13.7 kg). Conclusion: Removal force was affected by height followed by cement. Improv^TM cement resulted in tensile strength twice that achieved by Temp BondŽ.Supported by NobelBiocare/University of Michigan Center for Excellence

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