Fig. 4From: Er:YAG laser removal of zirconia crowns on titanium abutment of dental implants: an in vitro studySEM microphotographs (× 5000) of zirconia sheet: A Zirconia sheet without laser irradiation; B 1 mm zirconia sheet after 120 s of laser irradiation; C 3 mm zirconia sheet after 5 min of laser irradiation, burning spots were observed on the surfaceBack to article page