The removal of provisional zirconia prosthesis on titanium abutment of dental implants using Er:YAG laser:An in vitro study
CHEN Xi
JIANG Xing
CAI Pingping
ZHENG Zhiqiang
LIN Jie
Abstract：Objective This in vitro study aimed to evaluate the efficacy and safety of Er:YAG(Erbium-doped Yttrium Aluminum Garnet)laser technology for the removal of zirconia restorations from titanium abutments in dental implants.Methods A total of 120 zirconia plates(10 mm × 10 mm)of varying thicknesses(1 mm,2 mm,3 mm;10 plates per thickness)were bonded to 120 titanium blocks(20 mm× 10 mm× 10 mm)using four types of dental cements:Glass Ionomer Cement(GIC),Zinc Polycarboxylate Cement(ZPCC),Zinc Phosphate Cement(ZPC),and Resin Cement(Clearfil SA Luting,RC).After 24 hours,an Er:YAG laser(300 mJ,15 Hz,4.5 W)was applied for 2 minutes under a constant tensile force of 2 N to debond the zirconia plates.The removal efficacy,adhesive residue,and thermal effects were analyzed via universal testing machine,scanning electron microscopy(SEM),and X-ray diffractometry(XRD).Shear bond strength(MPa)and debonding time(s)were statistically evaluated using Kruskal-Wallis and Bonferroni-corrected Wilcoxon tests.Results Laser debonding succeeded in all 1 mm and 2 mm zirconia plates in the GIC group,while only 1 mm plates were successfully removed in the ZPCC and ZPC groups.In RC group,no plates were successfully debonded by laser.XRD analysis confirmed minimal thermal damage to zirconia,indicating negligible thermal conduction during laser ablation.Conclusion The Er:YAG laser demonstrated good efficacy in removing zirconia plates from titanium substrates with controlled thermal damage on both titanium and zirconia materials,offering a promising approach for non-destructive restoration retrieval in implant dentistry.
Keywords：Er:YAG Laserresin cementzinc polycarboxylate cementzinc phosphate cementglass ionomer cement
Publication Date：2025-08-28
Online Publishing Date：2025-10-15(First online date of this platform, not the publication date of the document)
Pages：6( 456-461 )