A randomized controlled trial to investigate brackets bonded with a hydrophilic primer.
OBJECTIVE
To compare the clinical failure rates of brackets bonded using a prototype hydrophilic primer, designed to be insensitive to moisture, with brackets bonded with a conventional primer.


METHODS
Single centre randomised controlled clinical study. Thirty-three patients were bonded using a split mouth technique: randomly allocating the hydrophilic primer to one side of the mouth and a conventional primer to the other.


METHODS
Hospital orthodontic department, Bradford, UK.


METHODS
Orthodontic patients requiring fixed appliances.


METHODS
The site and time to bond failure was recorded for each bracket that failed over 6 months.


RESULTS
Using survival analysis, there was an increased risk of bracket failure when bonded with the hydrophilic primer compared with the conventional primer (hazard ratio = 2.2, 95% confidence interval: 1.1 to 4.5, P = 0.01).


CONCLUSIONS
This hydrophilic primer cannot be recommended for routine clinical use.
Littlewood
S J
SJ
Department of Orthodontics, St Luke's Hospital, Little Horton Lane, Bradford, UK.
Mitchell
L
L
Greenwood
D C
DC
D000293:Adolescent; D017438:Bisphenol A-Glycidyl Methacrylate / Q000737:chemistry; D002648:Child; D001840:Dental Bonding / Q000379:methods*; D003738:Dental Cements / Q000737:chemistry*; D004868:Equipment Failure; D006801:Humans; D016910:Orthodontic Brackets; D016016:Proportional Hazards Models; D016037:Single-Blind Method; D018709:Statistics, Nonparametric; D016019:Survival Analysis; D014867:Water / Q000737:chemistry
D003738:Dental Cements; D014867:Water; C065742:Transbond; D017438:Bisphenol A-Glycidyl Methacrylate