Bond strength of a fluoride-releasing bracket adhesive

Abstract

The aim of the study was to examine a new fluoride-releasing light-cured filling composite for its bonding and debonding qualities when used as a bracket adhesive. The material investigated was a hybrid composite containing a chemically modified fluoride apatite, which is claimed to provide the enamel with phosphate, calcium, and fluoride ions in the presence of an acid pH, recharging its resources of these ions through fluoride-containing toothpastes used in daily oral hygiene. Concurrently suitability as an enamel conditioner was tested in a new self-etching primer, which does not require water rinsing but is gently air dried instead. For comparison a conventional light-cure single-component adhesive was used together with 37% orthophosphoric acid. After application of the respective conditioners, mesh-backed metal brackets were bonded to 20 human premolars in each of the 2 adhesive groups and subjected to a shear test. Bond failure location was evaluated using the Adhesive Remnant Index (ARI). Average bond strength of the experimental bracket adhesive and the conventional etchant was 8.96 MPa. Conditioning with the self-etching primer led to a decrease of mean shear bond strength values to 6.55 MPa. Highest bond strength was determined in the control group (12.19 MPa). The bond strength results obtained in the shear test recommend the new material as a bracket adhesive to be used with orthophosphoric acid for etching.

Laboratory evaluation of a self-etching primer for orthodontic bonding

“…The gingivo-occlusal direction of the shear debonding force used is similar to that in other research studies (Millett et al, 1999;Sargison et al, 1999;Linklater and Gordon, 2001). Application of a different direction of debond force (occluso-gingival) has, however, been employed in other investigations (Bishara et al, 1999(Bishara et al, , 2001Graf et al, 1999).…”

Eine vergleichende In-vitro-Studie zur Haftfestigkeit von mit Kleber vorbeschichteten und nicht vorbeschichteten Brackets

“…Um den Zeitfaktor, den eine Lichthärtung (Trockenlegung, Polymerisationszeit) mit sich bringt, zu reduzieren, wurden wesentliche Verbesserungen erreicht. Lampen mit kürzeren Polymerisationszeiten und höheren Lichtintensitäten 6 7 8 , Kleber, die keine Trockenlegung erfordern 9 10 11 , stellen Entwicklungen in diese Richtung dar.…”