Storage media effect on bond strength of orthodontic brackets.
BACKGROUND
In testing bond strengths, various storage media are used. The purpose of this study was to determine the effect of 6 storage media and rinsing on the shear bond strength of bonded orthodontic brackets.


METHODS
Bovine teeth were stored in 6 storage media for 7 months before bonding: dry (no medium), filtered water, 10% formalin, 1% chloramine T, 10% chloramine T, isotonic saline solution, and 70% ethanol. These teeth were further subdivided into 2 groups; 1 group was rinsed with oil-free air and water spray before bonding orthodontic brackets, and the other group not rinsed. All specimens were tested in the shear-peel mode to failure.


RESULTS
The 10% formalin rinsed sample had statistically significantly higher bond strength (16.9 +/- 6.56 MPa), and storage in ethanol (rinsed, 9.04 +/- 5.61 MPa; not rinsed, 9.08 +/- 3.5 MPa) and dry (8.34 +/- 3.80 MPa) produced significantly lower bond strengths. No difference was found between the other modes of storage or rinsing. The adhesive remnant index values showed no statistically significant difference between any groups.


CONCLUSIONS
For bond strength studies, storage media can have an effect on bond strength results. Dry, formalin, and ethanol storage should be avoided. Water, isotonic saline solution, and chloramine T storage produced comparable bond strengths. Rinsing or not rinsing had no effect on bond strength with these storage media.
Jaffer
Salman
S
Department of Orthodontics, School of Dentistry, University of Colorado at Denver and Health Sciences Center, Aurora, CO 80045, USA.
Oesterle
Larry J
LJ
Newman
Sheldon M
SM
D000268:Adhesiveness; D000388:Air; D000818:Animals; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D002417:Cattle; D002700:Chloramines / Q000737:chemistry; D001840:Dental Bonding; D003743:Dental Enamel / Q000648:ultrastructure; D003890:Desiccation; D004202:Disinfectants / Q000737:chemistry; D000431:Ethanol / Q000737:chemistry; D005557:Formaldehyde / Q000737:chemistry; D007552:Isotonic Solutions / Q000737:chemistry; D019188:Organ Preservation Solutions / Q000737:chemistry*; D016910:Orthodontic Brackets; D019279:Resin Cements / Q000737:chemistry; D033081:Shear Strength; D012965:Sodium Chloride / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D013696:Temperature; D007507:Therapeutic Irrigation; D013997:Time Factors; D014070:Tooth; D014105:Tosyl Compounds / Q000737:chemistry; D014867:Water / Q000737:chemistry
D002700:Chloramines; D004202:Disinfectants; D007552:Isotonic Solutions; D019188:Organ Preservation Solutions; D019279:Resin Cements; D014105:Tosyl Compounds; C016300:chloramine-T; D014867:Water; C065742:Transbond; D005557:Formaldehyde; D000431:Ethanol; D012965:Sodium Chloride; D017438:Bisphenol A-Glycidyl Methacrylate