Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Retrieval of Prefabricated Zirconia Crowns with Er,Cr:YSGG Laser from Primary and Permanent Molars

Version 1 : Received: 30 September 2020 / Approved: 1 October 2020 / Online: 1 October 2020 (09:05:59 CEST)

How to cite: Deeb, J.G.; McCall, C.; Dahlke, W.; Carrico, C.; Grzech-Leśniak, K. Retrieval of Prefabricated Zirconia Crowns with Er,Cr:YSGG Laser from Primary and Permanent Molars. Preprints 2020, 2020100007 (doi: 10.20944/preprints202010.0007.v1). Deeb, J.G.; McCall, C.; Dahlke, W.; Carrico, C.; Grzech-Leśniak, K. Retrieval of Prefabricated Zirconia Crowns with Er,Cr:YSGG Laser from Primary and Permanent Molars. Preprints 2020, 2020100007 (doi: 10.20944/preprints202010.0007.v1).

Abstract

(1) Background: Prefabricated zirconia crowns are used to restore teeth in children. The purpose of this study was to evaluate the removal of these crowns with the erbium, chromium: yttrium-scandium-gallium-garnet (Er,Cr:YSGG) laser; (2) Methods: Twelve primary and 13 permanent teeth were prepared and prefabricated zirconia crowns were passively fitted and cemented with two resin modified glass-ionomer cements. Surface areas of prepared teeth and crowns were calculated. Crowns were removed using two laser settings: 4.5 Watts, 15 Hertz, 20 water/ 20 air, and 5 Watts, 15 Hertz, 50 water/50 air. The retrieval time and temperature changes were tested recorded. Data were analyzed using ANOVA with Tuckey’s adjusted post hoc pairwise comparison t-test; (3) Results: The average time for crown removal was: 3 minutes, 47.7 seconds for permanent; and 2 minutes 5 seconds for primary teeth. The mean temperature changes were 2.48℃ (SD=1.43) for permanent; and 3.14℃ (SD=1.88) for primary teeth. The time to debond was significantly positively correlated with tooth inner surface area and volume, outer crown volume, and the cement volume; (4) Conclusions: Use of the Er,Cr:YSGG laser is an effective, safe and non-invasive method to remove prefabricated zirconia crowns cemented with RMGI cements from permanent and primary teeth.

Subject Areas

debonding; Er,Cr:YSGG laser; primary teeth; RRIDs; zirconia crown

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