Abstract
Aim: An assessment of fracture resistance and marginal fit of zirconia inlay-retained fixed partial denture (IRFPD) prepared with two different cavity designs (tub shape and box shape cavity preparation).
Materials and Methods: Twenty IRFPD were constructed. Samples got divided up into two groups according to cavity design (n=10), group 1 was designed as box-shape design, while group 2 was designed in tub shape. After that, both groups were split up into two sub-groups (n=5) according to the test they were subject to; Sub-group A for fracture resistance test. And sub-group B for marginal fit test. Self-adhesive resin cement (Biscem) was used to cement all samples, were then put through a universal testing machine's fracture resistance test, while Marginal fit was computed via an optical digital microscope.
Results: Results showed that box shape preparation design recorded statistically significant higher fracture resistance mean value (2217.1±87.9 N) than tub shape design (1976±20.1 N). While the marginal fits of the tub-shaped preparations did not significantly differ from one another. (premolar 59±4.5μm, molar 57.4±3.6 μm) and box-shaped preparation (premolar, 60.4±4.9 μm ,molar 58.4±2.5 μm )
Conclusion: Fracture resistance of zirconia inlay –retained bridges is impacted by cavity preparation, design. Regarding the preparation design the box shape cavity design demonstrated greater fracture resistance than tub shape cavity design. Every fracture resistance and marginal gap measurement was within the range that is considered clinically acceptable.