Effect of tightening protocols on abutment screw loosening and morphological changes in two-piece zirconia implants: A comparative study using cyclic torsional loading.

PURPOSE: This study evaluates the effects of different abutment screw tightening protocols and implant materials on screw loosening and morphological changes after cyclic torsional loading of two-piece implants. METHODS: Titanium (T) and zirconia (Z)…

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