Abstract
The early pioneers of orthodontics, like Angle, Kingsley and Farrar, devised appliances that have now evolved into what is known as the preadjusted edgewise appliance. With the introduction of preadjusted appliances, the focus has moved to customization of brackets to achieve specific and exact positioning of the dentition. These preprogramed features of the orthodontic bracket can be completely effective only if the bracket slot is accurate. Aims and objectives: The purpose of this study is to evaluate the slot size of eight different commercially available straight wire brackets of 0.018 inch slot and 0.022 inch slot with two different measuring devices. Materials and methods: Out of 80 straight wire brackets (Roth), 40 each of 0.018 inch slot and 0.022 inch slot from four commercially available manufacturers (3M Unitek, TP, Ortho Organizers and Ormco) were used for the study. Each bracket sample from all the eight groups was measured for its slot size at the top and the base of the slot using two different measuring devices namely Starrett profile projector and PrakaVision profile projector. Both the measuring devices give a digital read out to the accuracy of 0.001 mm. Data obtained were subjected to statistical analysis. Results: The slot size for ortho organizer—0.018 inch slot brackets was very close to the standard, whereas the other brackets were either oversized or undersized as compared to the standard.
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