A clinical trial comparing the failure rates of directly bonded brackets using etch times of 15 or 60 seconds

An 8 Month Clinical Trial of Bond Failues with Four Different Types of Orthodontic Adhesives

“…The gender of the patient did not influence the bond failure rates obtained in the present study (Table 6) confirming the results of previous clinical reports (17,19,20).…”

“…The relationship between bond failure and region of the dental arch has not received much attention in previously published clinical studies. The few reports available are contradictory since they found more bond failures in the left (16) or the right side of the dental arch (17). There are several possible factors in determining the difference of bond failure rate between the two regions: the clinicians being righthanded could make access, bracket placement and moisture control easier on the right side, the habitual side during mastication and the difference in pressure exerted during toothbrushing (18).…”

“…20 consecutive patients (10 male, 10 female; age range: [16][17][18][19] requiring orthodontic treatment by means of fixed appliances were selected and treated by the first author who was an experienced orthodontist. All of the patients had required non-extraction treatment.…”

Relationship between enamel etch characteristics and resin-enamel bond strength

“…They are also consistent with clinical findings 14,15,16,17 that the bond failure rate is higher with posterior teeth, than anterior teeth.…”

“…This is surprising as the lower first molar is reported to have the greatest rate of bond failure in the clinical situation. 14,15,16,17 The reason for the higher rate of bond failure for these teeth may be due to greater masticatory forces. 16 If the stresses placed upon ortho- .…”