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Research Article
Roberta Condò
University of Rome “Tor Vergata”
Corresponding Author
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Background Bond strength of orthodontic composite is strongly influenced by molecular and structural mechanisms. Aim of this in vitro study was to compare the bond strength of light-cure orthodontic composites by measuring debonding forces and evaluating locations of bond failure. Investigations on chemical compositions clarified adhesive behaviors and abilities, exploring effects of ageing processes in this junction materials.
Methods Sixteen human premolars were selected to realize specimen of enamel sections, randomly divided into three groups, which was assigned a different orthodontic adhesive system and then underwent to Shear Bond Strength test.
Twenty-seven human premolars were selected to produce samples, each of which was coupled at a metallic bracket, bonded to the enamel tooth surface with one of the three orthodontic adhesive systems, to quantify, at FE-SEM magnifications, after debonding, the residual material on enamel and bracket base surfaces.
Eight test discs of each orthodontic composite, were divided into three randomly groups to study accelerated aging effects in human saliva and sugary drink. Chemical compositions of composite materials were investigated, before and after ageing procedures, by Raman Spectroscopy analysis.
Conclusion The orthodontic adhesive systems showed rather similar strength of adhesion to enamel. The breakage of adhesive-adherent bond occurs in TXT at enamel-adhesive interface while in Bisco and Leone composites at the adhesive-bracket interface. Accelerated in vitro aging demonstrated a good physical-chemical stability for all orthodontic composites, Bisco only, was weakly contaminated with respect to the other two materials.
Keywords
Light-cure orthodontic composites, Shear Bond Strength, Field Emission Scanning Electron Microscope, Weight loss analysis and Raman Spectroscope
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No competing interests reported.
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CURRENT STATUS: Under Review
Version 1
Posted 17 May, 2021
No community comments so far
Editorial decision: Major revision
On 01 Jun, 2021
Reviews received
Received 27 May, 2021
Reviewers agreed
On 17 May, 2021
Reviewers invited
Invitations sent on 16 May, 2021
Editor assigned
On 16 May, 2021
Editor invited
On 13 May, 2021
Submission checks complete
On 13 May, 2021
First submitted
On 12 May, 2021
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This preprint is under consideration at BMC Oral Health. A preprint is a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Learn more about In Review
Research Article
Roberta Condò
University of Rome “Tor Vergata”
Corresponding Author
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Under Review
Version 1
Posted 17 May, 2021
No community comments so far
Editorial decision: Major revision
On 01 Jun, 2021
Reviews received
Received 27 May, 2021
Reviewers agreed
On 17 May, 2021
Reviewers invited
Invitations sent on 16 May, 2021
Editor assigned
On 16 May, 2021
Editor invited
On 13 May, 2021
Submission checks complete
On 13 May, 2021
First submitted
On 12 May, 2021
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
License:
This work is licensed under a CC BY 4.0 License. Read Full License
Background Bond strength of orthodontic composite is strongly influenced by molecular and structural mechanisms. Aim of this in vitro study was to compare the bond strength of light-cure orthodontic composites by measuring debonding forces and evaluating locations of bond failure. Investigations on chemical compositions clarified adhesive behaviors and abilities, exploring effects of ageing processes in this junction materials.
Methods Sixteen human premolars were selected to realize specimen of enamel sections, randomly divided into three groups, which was assigned a different orthodontic adhesive system and then underwent to Shear Bond Strength test.
Twenty-seven human premolars were selected to produce samples, each of which was coupled at a metallic bracket, bonded to the enamel tooth surface with one of the three orthodontic adhesive systems, to quantify, at FE-SEM magnifications, after debonding, the residual material on enamel and bracket base surfaces.
Eight test discs of each orthodontic composite, were divided into three randomly groups to study accelerated aging effects in human saliva and sugary drink. Chemical compositions of composite materials were investigated, before and after ageing procedures, by Raman Spectroscopy analysis.
Conclusion The orthodontic adhesive systems showed rather similar strength of adhesion to enamel. The breakage of adhesive-adherent bond occurs in TXT at enamel-adhesive interface while in Bisco and Leone composites at the adhesive-bracket interface. Accelerated in vitro aging demonstrated a good physical-chemical stability for all orthodontic composites, Bisco only, was weakly contaminated with respect to the other two materials.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
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