5. Conclusions
fracture, tooth
The loss of tooth structure, especially the marginal ridges, adversely affects the strength of teeth, even if supported by high-strength full-contour Zi crowns. The DME technique is suitable for use when deep margins are encountered, and the length of the DME-to-crown margins does not significantly impact its fracture resistance. However, caution should be undertaken in MOD preparations where the distance between the DME and the crown margins reaches 4 mm. Although unfavorable failures were common in this study, the load required to fracture all the samples, regardless of the DME margins, far exceeded the maximum recorded biting force.