Hybrid abutment-Crowns with offset implant placement: Effect of titanium base height and machinable crown material on bacterial leakage

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Abstract Background The purpose of the current study was to assess the effect of two different titanium base heights and three different machinable crown materials on bacterial leakage around hybrid-abutment crowns. Methods 42 implant fixtures with typical external geometries hybrid-abutment crowns designed in CAD system were used. Samples were divided into six equal groups according to two variations, crown material, zirconia (Z), lithium disilicate (L), and hybrid ceramic (V) to accommodate two different heights of Ti-Base abutments either were short Ti-Bases (S) with 4 mm (n = 21) or long Ti-Bases (L) 7mm (n = 21). Each subgroup was equal 7 (n = 7), groups were (ZS), (ZL), (LS), (LL), (VS) and (VL). Adhesive resin cement with a universal primer were used according to manufacturer instructions. Artifactial aging was done through water storage for 30 days, chewing stimulating for samples (50,000-cycles, 49 N, 1.67 Hz) and thermal cycling with (5000 cycles at 5–55°C) were applied. Samples were incubated in a bacterial suspension then leakage recorded by counting through colony forming unite (CFU). Results The average bacterial leakage among different material used was (2.88 ± 1.01),short zirconia crown group (ZS) showed the least microbial leakage (1.86 ± 0.9) followed by (VL) (2.57 ± 0.7), (LL) (2.57 ± 1.2) then (ZL) that was (3.29 ± 0.7) and (LS) with (3.43 ± 0.7). the (VS) group observed with the highest bacterial leakage with (3.57 ± 0.5). Conclusion the CAD/CAM fabricated zirconia crowns can be used over other ceramic material in term of bacterial leakage around dental implant.

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