Defense Date


Document Type


Degree Name

Master of Science



First Advisor

Sompop Bencharit


Removal of zirconia crowns, commonly used as cement-retained implant fixed restorations, can be challenging. Conventional methods of crown removal are time consuming and often leave irreparable damage to the crown, which can be costly to patients and practitioners. This research explored the use of two different types of pulsed erbium lasers, erbium-doped yttrium aluminum garnet laser (Er:YAG) and erbium, chromium-doped yttrium, scandium, gallium and garnet (Er,Cr:YSGG), as non-invasive tools to retrieve cemented zirconia crowns from zirconia implant abutments. Times needed to remove the crowns were recorded and analyzed using ANOVA (𝛼=0.05). No statistical differences between the debond times of each laser were observed. The surfaces of the crown and the abutment were further examined using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) examination. SEM and EDS examinations of the materials showed no visual surface damaging or material alteration from the two pulsed erbium lasers.


© Ahmed Elkharashi

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