Visual assessment of the bond strength between an orthodontic bracket and an impacted maxillary canine: the “blue-needle” test

Isherwood, Grant; Gruber, Elizabeth; Bowyer, Oliver; MacBean, Andrew

doi:10.1016/j.bjoms.2013.05.153

Cited by 2 publications

(2 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

Section: Introductionmentioning

confidence: 99%

“…5,6 However, their bonding performance in cases of impacted and severely misaligned teeth is uncertain, 7 resulting in inappropriate bonding protocols and application of excessive initial stresses to the bonded brackets. 8 Bonded orthodontic brackets are normally subjected to a complex combination of fluctuating stresses that may fatigue the adhesive bond. 9 Medically compromised and mouth-breathing patients may experience dry mouth, 10 a condition that involves cyclic episodes of wet and dry intraoral environments, with possible sorption and loss of fluids by the resin-based restoratives and adhesives.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Debonding characteristics of orthodontic brackets subjected to intraoral stresses under different adhesive regimes: An in-vitro study

Abdelaziz

Alshahrani

Kamran

et al. 2020

Journal of Applied Biomaterials & Functional Materials

View full text Add to dashboard Cite

Aim: To evaluate the effect of simulated intraoral hydraulic, thermal, and mechanical stresses on the debonding characteristics of orthodontic brackets under different adhesive regimes. Materials and methods: Groups of pre-coated (G1) and non-coated (G2) orthodontic metal brackets were bonded onto the buccal surfaces of 96 premolars using etch-and-rinse (SG1, n = 24) and self-etch (SG2, n = 24) primers. Twelve specimens (C1) from each subgroup were subjected to early debonding resistance tests, while the other twelve (C2) were used to test delayed debonding resistance after exposure to conditions simulating intraoral hydraulic, thermal, and mechanical stresses. The debonding resistance of the brackets was evaluated using a universal testing machine and the debonding patterns were micro-visualized to determine the adhesive remnant indexes of subgroups of specimens. Results: Within each group, the etch-and-rinse primer (SG1) resulted in higher debonding resistance than self-etch primers (SG2) ( p < 0.05), while there was no difference between non-stressed and stressed specimens ( p > 0.05). Within each category of test specimens, there was no difference between pre-coated (G1) and non-coated (G2) brackets ( p > 0.05). The tested specimens in all categories showed comparable adhesive remnant indexes. However, higher percentages of favorable scores (0 and 1) were obtained for all stressed specimens. Conclusions: Short-term cumulative intraoral stresses have no adverse effect on the debonding values of either pre-coated or non-coated brackets when either etch-and-rinse or self-etch primer is used for bonding. Exposure of the bonded brackets to different types of stress reflects favorable debonding patterns.

show abstract