and thus crack induction points. One may hypothesize
that under slight load the internal stress relaxation that
happens within the material is enhanced and thus
stress induction points may be reduced.
In a clinical situation the crown material is not known
to the orthodontist. The procedure used will work with
any ceramic. Therefore, the proposed protocol is a safe
approach.
5. Conclusion
Based on the results of this in vitro study obtained with
Cojet, Monobond Plus and Heliosit Orthodontic and
considering the limitations of in vitro results one can
conclude that
• Under OL and TC, the highest bond strength was
observed.
• Load or TC alone yielded similar or lower shear
bond strengths.
• Sandblasting with CoJet and using Monobond
Plus as primer is a good protocol for bonding to
ZrO crowns in orthodontic therapy.
Therefore, it is recommended for future in vitro tests of
adhesives for orthodontic purposes to test under OL
and TC.
Author Contributions
HSH: Performed experiment, wrote manuscript. NA:
Performed experiment, proofread manuscript. CS:
Data analysis, proofread manuscript. CD: Consulting
of orthodontic aspects of experiment, proofreading
manuscript. JFR: Idea, experimental design, proofread
manuscript.
Acknowledgments
The authors declare no conflict of interest related to this
study. There are no conflicts of interest and no financial
interests to be disclosed.
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