The present study was conducted with the aim of evaluating and comparing the microleakage of glass ionomer, composite resin and compomers. Class V cavities were made in thirty intact caries free premolars and restored with restorative materials to be tested respectively. The teeth were thermocycled and subjected to silver nitrate dye penetration. They were subsequently sectioned buccolingually. Microleakage was evaluated under a stereomicroscope and data subjected to statistical analysis. The study concluded that microleakage was evident in all restorative materials, with glass ionomer showing maximum leakage followed by composite resin. Compomer demonstrated the best results with minimum leakage.
The aim of the study was to find out the relative reliability of different clinical anatomical landmarks to determine the midline of face and the hierarchy of facial anatomical landmarks closest to the midline of the face. The facial anatomical landmarks such as-nasion, tip of nose, tip of philtrum, incisive papilla and dental midline were chosen as they are commonly used in clinical practice. 100 patients were randomly selected; full face digital images were made with clinical markings on selected anatomical landmarks. Esthetic frame was constructed on each image with digital lines passing through each marked point. Casts were made for maxillary arch of each subject. Two sets of readings were tested using intra class correlation coefficients (ICCs) reliability test. To determine whether the selected landmarks differed from midline of face and mouth, a series of one-sample t test were conducted with alpha value of 0.5. 5 Relative facial midline value (RFV) and 4 relative commissural midline value (RCV) values were obtained for each subject. Two hierarchal orders were obtained; one defining the relation of various landmarks to midline of face and second for midline of mouth. Observation from casts revealed that incisive papilla lined up with defined dental midline. Intercommissural midline ranked closest to facial midline followed by dental midline, tip of philtrum, nasion, and tip of nose. Landmarks closest to midline of mouth are tip of philtrum, dental midline, nasion and tip of nose. Incisive papilla lies in direct relation to dental midline. Centre of mouth is reliable midline anatomical landmark for determining midline of face.
A bstract Aim and objective This study aims to compare the retentive strength of different adhesive cements used for band cementation of fixed space maintainer by comparing the shear peel bond strength and mode of failure for each adhesive material using three different adhesive cements. Materials and methods Eighty intact extracted teeth were used to assess the shear peel bond strength. Preformed bands were adapted to each tooth. Three cements compared in this in vitro study are glass ionomer cement [Ketac Cem radiopaque (3M ESPE)], resin-modified glass ionomer cement [RelyX luting 2(3M ESPE)], and self-adhesive resin cement [RelyX U200 (3M ESPE)]. The teeth were randomly divided to four groups of 20 samples each. All samples were stored at 37°C for 24 hours before testing. All specimens were tested in a tensile mode using a universal testing machine to determine shear peel bond. After debonding procedure, each specimen was visually assessed at the site of cement. Results The results of our study showed that the greatest resistance to decementation was shown by self-adhesive resin cement (256.85 N) followed by resin-modified GIC (165.40 N) and GIC (127.40 N) ( p < 0.001). Self-adhesive resin cement has the greatest shear peel bond strength (2.36 MPa) followed by resin-modified GIC (1.53 MPa), conventional GIC (1.22 MPa), and bands without cementation (0.29 MPa) ( p < 0.001). In terms of adhesive remnant index (ARI) scores, it was seen that the decementation of bands of both conventional GIC and self-adhesive resin cements occurred at the band/enamel interface. However, resin-modified GIC showed varied results in the ARI scores. Conclusion The findings of our study suggest that self-adhesive resin cements can be used for cementation of bands of fixed space maintainers. However, further research with short-term and long-term data is required to evaluate the ability of these cements for its application in vivo . How to cite this article Kaur J, Singh A, Sadana G, et al. Evaluation of Shear Peel Bond Strength of Different Adhesive Cements Used for Fixed Space Maintainer Cementation: An In Vitro Study. Int J Clin Pediatr Dent 2021;14(2):175–179.
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