Modifying Digital Occlusal Spacer Effect on the Marginal Gap of Zirconia-Reinforced Lithium Silicate Crowns: In Vitro Scanning Electron Microscopy Evaluation.

A clinically acceptable marginal gap (< 120 µm) was obtained for all three occlusal spacers (60, 90, 120 µm), and as the digital occlusal spacer was reduced the marginal gap reduced as well. The 120-µm occlusal spacer showed a significantly higher marginal gap compared to 90 and 60 µm. The digital occlusal spacer that should be favorable for ZLS crowns is 60 µm.