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.
Aim The process of bonding orthodontic appliances to the enamel surface of the teeth has come to the forefront as a major improvement in bonding techniques. The purpose of this study is to compare the shear bond strength of stainless steel orthodontic brackets bonded using conventional direct bonding and indirect bonding as described by Thomas. Materials and methods Forty sound human premolars were divided into two groups of 20 each. Group I samples were bonded directly on the tooth surface using concise two paste adhesive system after etching and drying. Group II samples were bonded indirectly on the tooth surface according to Thomas indirect bonding technique using concise two paste adhesive system. The stored specimen was tested for shear bond strength in an Instron universal testing machine at a crosshead speed of 0.5 mm/minute. Data obtained were subjected to statistical analysis. Results The results showed that there was no statistically significant difference in the shear bond strength between direct and indirect bonding techniques. Chi-square test showed that there were significant differences among the adhesive remnant index scores between direct and indirect bonding groups. Conclusion In vitro shear bond strength comparison between direct and indirect-bonded attachments showed no significant difference between the two groups. Bond strength obtained with Thomas indirect bonding technique was comparable with direct bonding technique. Clinical significance Thomas indirect bonding technique can be used for bonding of the posterior teeth, where the risk of moisture contamination is high during bonding. How to cite this article Swetha M, Pai VS, Sanjay N, Nandini S. Indirect versus Direct Bonding—A Shear Bond Strength Comparison: An in vitro Study. J Contemp Dent Pract 2011; 12(4):232-238.
One of the major reason for a successful denture treatment is a good impression and the cast made out of it. It’s a well known fact, that the denture can only be as good as the impressions made. Therefore, attention to every detail and depth of the impressions plays a pivotal role for a successful clinical result, for which border moulding is an essential procedure for the same. Impressions convey operator’s extent of knowledge, understanding and the clinical results that can follow. A combination of a sound knowledge, along with acquired skill, experience, and patience can result in a successful and aesthetic prosthesis with adequate retention, stability and support with minimal post placement corrections. This article gives an insight into the necessary requisites to be followed during border moulding and secondary impression in making of a successful complete dentures.
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