Abrissfestigkeit von kieferorthopädischen Bändern, die unterschiedlich vorbearbeitet wurden

Abstract

In this study, the adhesion of orthodontic molar bands on tooth enamel, which is a necessary prerequisite for orthodontic measures, was tested in vitro under shear stress. Six different composite materials were used: the conventional glass ionomer cements Ketac Cem, Fuji Ortho, Fuji Ortho Band, and the polymer-cement Fuji Ortho LC, Ultra-Band-Lok, and Lightform. The aim of this study was to investigate the influence of the surface of orthodontic molar bands on the shear strength on various commercially available cements. Moreover, the effect of 25 % polyacrylic acid enamel conditioning on the adhesion strength of Fuji Ortho LC and Fuji Ortho was examined. The analysis of the experimental results showed that an appropriate bond is achieved when using laser roughened or sand blasted metal surfaces in combination with Fuji Ortho Band, Fuji Ortho, and Ketac Cem. Fuji Ortho LC achieved acceptable adhesion only when using sand blasted bands. The use of untreated bands led to very poor bonding. With most cements the bonding was, in fact, insufficient. Ultra-Band-Lok and Lightform are not well suited for the fixation of ligaments. An adequate bond during the therapy period must be guaranteed using fixed appliances. The removal of the bands has to be unproblematic. Frequent losses of molar bands are equally unpleasant for both the patient and the practitioner and cause unnecessary delays. Using excessive force to remove the bands may result in painful strains on the periodontal ligament.