Implant supported fixed-detachable hybrid dentures (FDHD) are traditionally composed of a gold-alloy substructure, which contributes significantly to their cost and fabrication difficulty.  Objective: To test different reinforcement designs of poly(methyl methacrylate) (PMMA, Lucitone 199, Dentsply) with the same amount (0.110 ± 0.005 g) of E-glass fibers (Stick, StickTech) in a simulated cantilever model FDHD. Methods:  Specimens (n=6) consisted of a 5x5x42.5mm³ rhombic form fabricated into four cross-sectional designs (1 PMMA control & 3 PMMA/fiber, as in table).  Each fiber mass was measured equal before fabrication. Two metal provisional cylinders (Straumann) were incorporated 18.5mm apart and positioned 4 and 20mm (cantilever) from the lengthwise ends.  Specimens were polymerized according to the manufacturer's protocol then stored at 37^OC distilled water for 3 weeks.  Specimens were screw retained (35 Ncm) to a custom testing jig then loaded 5mm from cantilever edge on a universal testing machine.  Initial (IF) and final failures (FF) were recorded.  Means and standard deviations (SD) were calculated.  Same superscript letter indicates no significant difference (ANOVA then Tukey post hoc analysis, p< 0 .05). Results: See table. Conclusion:  Cross-sectional design affects cantilever IF and FF loads with bilaminar sandwich and fully distributed designs yielding the highest load to failure.

	Cross-sectional Designs with Equal Fiber Amount(PMMA-white, fiber-black)
IF ± SD (in N)	47.0 ± 3.6A	188.9 ± 47.0C	160.6 ± 26.5C	71.9 ± 11.8B
FF ± SD (in N)	77.3 ± 18.4X	217.4 ± 68.8Z	187.5 ± 39.8Y,Z	131.2 ± 56.9X,Y