Biomechanical evaluation of class II inlays: The role of restorative material, resin liner, and retentive pin-hole.

Researchers compared fracture strength of class II inlays made from two materials (lithium disilicate and zirconia) with different retention designs in extracted teeth. Neither material nor retention method alone significantly affected fracture resistance, but their combination did; zirconia transferred less stress to tooth structure and showed fewer non-repairable fractures.

A plain-English summary of the study's own findings — we don't add our own claims or interpretation. Read the full paper for the complete methods and results, and apply your own clinical judgement.