Effect of Different Temporary Crown Materials and Surface Roughening Methods on the Shear Bond Strengths of Orthodontic Brackets

Abstract

The effects of the chemical nature of TCMs on the SBS values appeared to be clinically negligible, whereas the type of surface treatments had a significant influence on bond strengths. Er:YAG laser irradiation caused a significant increase in bond strength between the TCMs and orthodontic brackets.

Adhesion strength of orthodontic brackets to acrylic surfaces. A systematic review on in vitro studies.

“…All studies 2,4,5,7,8 included at least one group of bis-acryl/bis-GMA 2,4,5,7,8 composite resins and one of an acrylic resin based on methacrylate (MMA), 4 polymethyl methacrylate (PMMA) 2,5,7,8 or poly ethyl methacrylate (PEMA). 2,4,7 One also included a resin based on urethane dimethacrylate (UDMA). 7 All studies performed shear bond tests and presented the mean results in MPa.…”

“…2,4,7 One also included a resin based on urethane dimethacrylate (UDMA). 7 All studies performed shear bond tests and presented the mean results in MPa. Three revealed a significant influence of the surface type on the bond strength of orthodon- (n=138) Lilacs ( tic metal 2,4,5 and ceramic brackets.…”

“…8 One study stated that the surface type did not influence bond strength. 7 Type of surface treatment (n=7). Four studies evaluated three different surface treatments, 2,5,7,9 two evaluated two pre-treatments 10,11 and one analysed 14 groups all with different substrate treatments.…”

“…12 The surface treatments applied were the following: none (control), 5,12 polished with greenstone, 5 sandblasted, 2,5,7,9,11,12 silane, 12 diamond bur, 10,11,12 9.6% hydrofluoric acid, 12 37% phosphoric acid, 7,12 monomer, 2,12 plastic conditioner, 12 silica carbide paper, 2,9 pumice polishing paste, 2 pumice and rubber cup 10 and Laser Er:YAG. 7 Sandblasting with 50-μm Al 2 O 3 particles was performed in test groups of six studies. One study used a diamond bur not to grid the acrylic but to create a window in order to enhance the mechanical adhesion.…”

“…Five studies identified bond strength as being influenced by the surface treatment protocols. 2,5,7,9,11 One study related a higher roughness to an increase in the bond strength. 12 Another study also indicated that bond strength was influenced by the surface treatment but only for the light-cure composite resin.…”