THE JOURNAL OF HOKKAIDO ORTHODONTIC SOCIETY

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We compared two indirect bonding (IDB) techniques with regard to the three-dimensional accuracy of bracket positioning. In total,20 cast models from silicone impressions of epoxy maxillary dentition were made and divided into two groups. Brackets were positioned on each working model and two types of transfer trays, single-layer(S-tray) and double-layer with incisal(occlusal)stopper(D-tray), were fabricated. Composite resin paste was placed on the bracket bases, seated against the tooth surfaces of the epoxy model, and then light-cured. The working and epoxy models with brackets were scanned using a noncontact surface scanner, and the digital model images were superimposed. The mean linear difference in the bracket position between the working and final models ranged from 0.04 to 0.46 mm for the S-tray and 0.05 to 0.20 mm for the D-tray, while the mean angular difference in the bracket position between the working and final phantom models ranged from 0.54° to 1.90°for the S-tray and 0.58° to 2.18° for the D-tray. There were no significant differences between the groups in any comparison. The mean differences in the bracket positions for the IDB techniques used are clinically acceptable.

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