American Journal of Orthodontics and Dentofacial Orthopedics
Original articleEffect of early orthodontic force on shear bond strength of orthodontic brackets bonded with different adhesive systems
Section snippets
Material and methods
Eighty freshly extracted maxillary first premolars were collected, cleaned, and stored in a 0.1% aqueous thymol solution. The teeth selected had no cracks, caries, attrition, or restorations. They were embedded in autopolymerizing acrylic resin (Duracryl, SpofaDental, Prague, Czech Republic) poured in plastic rings with the buccal surface up. The teeth were cleaned and then polished with pumice and rubber cups. A hook made of 0.9-mm stainless steel round wire was fixed in the acrylic toward the
Results
The results of the 2-way ANOVA are given in Table II. Mean SBS values, standard deviations, and the results of the Duncan and t tests for the adhesive systems with and without application of force are shown in Table III. A graphic presentation of these values is shown in Figure 2.
Regarding SBS without application of force, Transbond XT primer and its adhesive system had the highest value (11.2 ± 3.1 MPa), whereas RelyX Unicem showed the lowest value (5.8 ± 1.5MPa). Rely-a-bond primer and its
Discussion
In clinical orthodontic practice, bonding of brackets and placement of the archwires can be done in the same visit, particularly after rebonding of debonded brackets. Hence, force could be applied to the bracket within the first hour after bonding. This force could affect polymerization of the orthodontic adhesive and subsequently its bond strength. The purpose of this study was to determine the development of bond strength of 4 adhesive systems subjected to a force similar to clinical
Conclusions
Regardless of the application of force, the Transbond XT primer and Transbond adhesive system yielded a significantly higher bond strength compared with the other studied systems. RelyX Unicem had the lowest value. Application of orthodontic force 30 minutes after bonding for 24 hours gave a nonsignificant reduction in SBS for all studied adhesive systems. However, the effect of such a force was less noticeable with RelyX Unicem. Therefore, orthodontic forces up to 120 g can be applied within
References (44)
- et al.
Variations in acid-etch patterns with different acids and etch times
Am J Orthod Dentofacial Orthop
(2001) - et al.
An evaluation and comparison of orthodontic bracket bond strengths achieved with self-etching primer
Am J Orthod Dentofacial Orthop
(2004) - et al.
Effect of a self-etch primer/adhesive on the shear bond strength of orthodontic brackets
Am J Orthod Dentofacial Orthop
(2001) - et al.
In-vivo prospective comparison of bond failure rates of 2 self-etching primer/adhesive systems
Am J Orthod Dentofacial Orthop
(2007) - et al.
Scanning electron microscopic evaluation of enamel surfaces exposed to 3 orthodontic bonding systems
Am J Orthod Dentofacial Orthop
(2006) - et al.
Effect of self-etching primer and adhesive formulations on the shear bond strength of orthodontic brackets
Am J Orthod Dentofacial Orthop
(2005) - et al.
Enamel pretreatment: a critical variable in direct bonding systems
Am J Orthod
(1973) - et al.
Effect of loading mode on bond strength of orthodontic brackets bonded with 2 systems
Am J Orthod Dentofacial Orthop
(2006) - et al.
Polymerization efficiency of chemically cured and visible light-cured orthodontic adhesives: degree of cure
Am J Orthod Dentofacial Orthop
(1995) - et al.
The need for standardization of test protocols
Semin Orthod
(1997)
Probability of failure of orthodontic brackets bonded with different cementing agents
Dent Mater
Bond strength comparison of 2 self-etching primers over a 3-month storage period
Am J Orthod Dentofacial Orthop
Effect of time on the shear bond strength of glass ionomer and composite orthodontic adhesives
Am J Orthod Dentofacial Orthop
Bonding of stainless steel brackets to enamel with a new self-etching primer
Am J Orthod Dentofacial Orthop
Effect of reduction of phosphoric acid concentration on the shear bond strengths of brackets
Am J Orthod Dentofacial Orthop
Light-cured or chemically cured orthodontic adhesive resins? A selection based on the degree of cure, monomer leaching, and cytotoxicity
Am J Orthod Dentofacial Orthop
Polymerization shrinkage of microfilled composites determined by laser beam scanning
Biomater
The effect of phosphoric acid concentration on resin tag length and bond strength of a photo-cured resin to acid etched enamel
Dent Mater
Bonding in orthodontics
A simple method of increasing the adhesion of acrylic filling materials to enamel surfaces
J Dent Res
Bonding plastic orthodontic attachments to the enamel
J NJ Dent Soc
Effect of self-etching primers on bond strength—are they reliable?
Angle Orthod
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The authors report no commercial, proprietary, or financial interest in the products or companies described in this article.