Abstract
Objectives
To compare the shear bond strength (SBS) of the CAD/CAM material-bracket interface using three surface treatments: following manufacturers’ instructions (MI), Monobond Etch & Prime (MEP) and 9.6% hydrofluoric acid plus silane (9.6% HF), after 24 h of water storage (24 h) and 10,000 cycles of thermocycling (TC).
Materials and methods
A total of 126 crowns with four identical buccal surfaces were fabricated using seven different CAD/CAM materials: CEREC Blocs unglazed (CBU), CEREC Blocs glazed (CBG), IPS Empress CAD (EMP), IPS e.max CAD (EMA), VITA SUPRINITY PC (SUP), inCoris TZI (TZI) and VITA ENAMIC (ENA). A total of 504 APC Flash-Free (APC FF)-precoated brackets were bonded applying three surface treatments: (1) MI; (2) MEP and (3) 9.6% HF. SBS was performed after 24 h and TC. Results were analyzed by Kruskal-Wallis and Mann-Whitney U tests (p < 0.05).
Results
MEP conditioning yielded lower SBS results compared with MI and 9.6% HF for CBG (24 h and TC) and EMA (TC) materials. EMP conditioning with MEP after 24 h obtained lower SBS values compared with MI; however, after TC, SBS was similar to MI group and higher than with 9.6% HF. After TC for TZI ceramic, MI protocol (sandblasting) obtained higher SBS scores than MEP, but similar than 9.6% HF. Treatment of ENA with MI and MEP produced higher results than 9.6% HF after TC. SBS results were similar for CBU and SUP, regardless of the treatment.
Conclusions
Although each CAD/CAM material requires specific surface treatment to obtain the highest SBS of APC FF brackets, the treatment with MEP is a valid orthodontic alternative for most of the materials tested. TC significantly decreased SBS for most of the materials.
Clinical relevance
MEP can be considered a valid and promising product to condition most of the CAD/CAM ceramics evaluated for APC FF bracket bonding purposes, allowing a faster and safer procedure.
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Acknowledgments
Authors are indebted to Dr. Neimar Sartori and Claudia Pohlen (CIRO) for collaborating with the digital part of the study and to the SEM technician Ana Vicente for helping us with the SEM analysis. This study is part of a thesis to fulfill the requirements for the PhD degree of first author C.G-S.
Funding
The work was supported by a predoctoral grant given by the Madrid Regional Dental Council (Madrid, Spain) to first author C.G-S to afford some of the materials used in this investigation. The work was also supported by Rey Juan Carlos University (Móstoles, Madrid, Spain) by a second grant to pay part of the travel and accommodation expenses to perform the study in University of Southern California (Herman Ostrow School of Dentistry, Los Angeles, CA, USA), where the study was conducted. This fact will made C.G-S to opt for the International Mention in his PhD degree.
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Carlos González-Serrano: conceptualization, writing (original draft), writing (review and editing), methodology, software, validation, investigation, resources, data curation, visualization, supervision, project administration and funding acquisition.
Jin-Ho Phark: conceptualization, formal analysis, writing (review and editing), methodology software, validation, resources, visualization and supervision.
María Victoria Fuentes: conceptualization, formal analysis, writing (review and editing), methodology, software, validation, data curation.
Alberto Albaladejo: writing (review and editing), formal analysis, methodology and conceptualization.
Andrés Sánchez-Monescillo: writing (review and editing), methodology, software, validation, resources, visualization and supervision.
Sillas Duarte Jr: conceptualization, writing (review and editing), methodology, software, validation, resources, data curation visualization, supervision and project administration.
Laura Ceballos: conceptualization, writing (review and editing), methodology, software, validation, data curation, visualization, supervision and project administration.
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González-Serrano, C., Phark, JH., Fuentes, M.V. et al. Effect of a single-component ceramic conditioner on shear bond strength of precoated brackets to different CAD/CAM materials. Clin Oral Invest 25, 1953–1965 (2021). https://doi.org/10.1007/s00784-020-03504-0
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DOI: https://doi.org/10.1007/s00784-020-03504-0