Porcelain surface-conditioning techniques and the shear bond strength of ceramic brackets

Abstract

The aim of this study was to compare the effects of various porcelain surface-conditioning techniques, used either alone or in combination, on the shear bond strength (SBS) of ceramic brackets cured with a light emitting diode (LED). Thirty glazed porcelain facets were randomly divided into three groups of 10. In group I, the porcelain surfaces were etched with 9.6 per cent hydrofluoric acid (HFA) for 2 minutes before silane application, in group II, the porcelain surfaces were sandblasted with aluminium oxide particles, etched with 9.6 per cent HFA for 2 minutes, and silane applied, and in group III, the porcelain surfaces were sandblasted with aluminium oxide particles before silane application. Spirit ceramic brackets were bonded with a light-cured composite resin (Light Bond) and a LED. All specimens were stored in distilled water at 37 degrees C for 24 hours and thermocycled. Bond strength was determined in shear mode at a crosshead speed of 0.5 mm/minute until fracture occurred. Analysis of variance indicated a significant difference between groups (P < 0.001). The lowest SBS was found in group III (5.46 +/- 1.34, P < 0.001). No significant difference was found between group I (11.38 +/- 1.65) and group II (10.45 +/- 1.15; P > 0.05). Surface treatment with HFA and a silane coupling agent produced the highest bond strength. Sandblasting before HFA and silane application did not significantly increase bond strength. Silane application to sandblasted porcelain provided poor results in vitro and clinical trials are needed to determine its reliability for bonding ceramic brackets to ceramic crowns.

Effect of various porcelain surface treatment methods on shear bond strength of orthodontic adhesive

“…Etching with strong acid as 9% hydrofluoric acid also produced strong bond between the orthodontic brackets and the porcelain surface. This is attributed to dissolving the ceramic matrix of porcelain surface this is in agreement with Roulet, (1995) [33] , Chen, (1998) [34] Bishara et al (2005) [28] Nagayassu et al (2006) [35] , Turkkahranman(2006) [36] , Kyung et al(2008) [37] , Trakyali et al (2009) [38] and Magali et al (2011) [39] Hydrofluoric acid produces some surface dullness on porcelain surface which should be taken in consideration.…”

Comparison of Shear Bond Strength of Ceramic Brackets Bonded To Ceramic Surface - An In-Vitro Study

“…[5][6][7] Ceramic restorations such as ceramic crowns or veneers are most commonly present in adult patients. [8][9][10][11] Therefore often the orthodontist must bond the ceramic brackets to ceramic restorations. The bonding force of ceramic brackets is achieved by mechanical retention of the adhesive to bracket base and by using silane coupling agent after preparation of the porcelain surface.…”

“…To improve bond strength combination of methods are recommended. 8 The present study was conducted to determine the shear bond strength of ceramic brackets bonded to ceramic surfaces with different surface treatments. This was required to know the best possible surface treatment to achieve optimal bond strength between ceramic brackets and ceramic surface.…”

Orthodontic shear bond strength to porcelain surface in wet conditions

“…The increasing number of adult orthodontic patients has led to challenges for Dentistry professionals, as they are increasingly faced with the need for bonding orthodontic accessories to surfaces that differ from tooth enamel, such as in the case of restorations with porcelain surfaces [1,2]. In Orthodontics, orthodontic accessory bonding is temporary, therefore, the bond strength must be sufficient to resist the forces applied during treatment, and on the other hand, fragile enough to allow debonding at the end of treatment, without damaging the teeth and the restorations they may present [3].…”