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Effect of organic solvents and ultrasound on the removal of orthodontic brackets
Author(s) -
Santana R. M.,
Rached R. N.,
Souza E. M.,
GuarizaFilho O.,
Camargo E. S.,
Pithon M. M.,
Tanaka O. M.
Publication year - 2016
Publication title -
orthodontics and craniofacial research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.664
H-Index - 55
eISSN - 1601-6343
pISSN - 1601-6335
DOI - 10.1111/ocr.12121
Subject(s) - adhesive , acetone , materials science , ultrasound , enamel paint , dentistry , ethanol , scanning electron microscope , composite number , composite material , shear strength (soil) , bond strength , etching (microfabrication) , nuclear chemistry , chemistry , organic chemistry , medicine , environmental science , layer (electronics) , soil water , soil science , radiology
Structured Abstract Objective To evaluate the effect of organic gel solvents (70% acetone and 90% ethanol) and ultrasound in the removal of metallic brackets. Materials and Methods Metallic brackets were bonded with light‐cured orthodontic composite (Transbond XT ) in 120 human bicuspids and divided into 6 groups for the enamel etch‐and‐rinse adhesive system ( XT ) and 6 groups to self‐etching system ( SEPT ) according to pretreatment to removal test: control, 70% acetone, 90% ethanol, ultrasound, 70% acetone+ultrasound, and 90% ethanol+ultrasound. The brackets were subjected to removal by shear testing and Adhesive Remnant Index ( ARI ) evaluation. Some specimens were prepared and its adhesive interface and etching ability observed by scanning electron microscopy ( SEM ). Results Only the factor ‘ultrasound’ and its interaction with ‘adhesive’ were detected as a source of variance, with the SEPT /ultrasound showing the lowest shear strength than the other groups. Regardless the factor ‘ultrasound’, XT showed a higher ARI than SEPT ; however, when the solvents were used, no differences were detected between XT and SEPT . Conclusion The organic solvents were not effective in reducing shear bond strength. The etch‐and‐rinse adhesive system showed a higher and more favorable ARI score than the self‐etching primer. The behavior of the organic solvents on ARI showed to be better when associated with the self‐etching primer. The ultrasound was effective in reducing the shear bond strength of the self‐etching adhesive system but not in affecting the ARI of the adhesive systems.