Evaluation of rebonding strengths of leucite and lithium disilicate veneers debonded with an Er:YAG laser

Abstract

Resin cements create a high bond between the tooth and ceramic surfaces, thus making it impossible to remove the restoration in one piece. The aims of this study were to evaluate (i) the efficiency of an Er:YAG laser for debonding, and (ii) the changes in the rebonding strength values of all-ceramic veneers, which were removed after laser application. A tooth reduction of 120 extracted human maxillary central incisors was made to provide two different bonding surfaces (60 enamel and 60 dentin). Sixty leucite and 60 lithium disilicate discs (1-mm thickness, 5-mm diameter) were cemented to prepared surfaces with a dual-cure resin cement. Each group was divided into two subgroups (n = 15): control and laser-irradiated. Er:YAG laser (2940 nm) was applied for 9 s at 3 W power (10 Hz, 300 mJ) with 100 μs pulse duration. Shear bond strength (SBS) test was made with a universal testing machine. After the tested laser-irradiated specimens had been rebonded, the SBS test was performed again and rebonding strengths were measured. The statistical evaluations were performed by using repeated measures one-way ANOVA and post hoc Bonferroni tests (p < 0.05). Significant differences were found between the control and laser-irradiated groups (p < 0.001). While the required SBS values for control groups were between 30.04 and 24.66 MPa, the values for laser-irradiated groups were between 6.60 and 4.09 MPa. There was no significant difference between the control and rebonded groups. Er:YAG laser-irradiation is an effective method for removing all-ceramic restorations without affecting the rebonding strength.

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Funding

This study was supported in part by a research grant from the Scientific Research Projects Committee of Marmara University, Istanbul (Project no. SAG-C-DUP-170118-0004).

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Correspondence to Rifat Gozneli.

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This article does not contain any studies with human participants or animals performed by any of the authors.

This article only contains a study with test samples prepared by using extracted human maxillary central incisors that were previously extracted for periodontal reasons.

Although no human participants or animals performed, this study was approved by the university human research ethics committee and all procedures performed in studies (involving human participants) were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Karagoz-Yildirak, M., Gozneli, R. Evaluation of rebonding strengths of leucite and lithium disilicate veneers debonded with an Er:YAG laser. Lasers Med Sci 35, 853–860 (2020). https://doi.org/10.1007/s10103-019-02872-8

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Keywords

  • All-ceramic
  • Debonding
  • Er:YAG laser
  • Rebonding
  • Shear bond strength