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Context: Mandibular impacted third molars are the most frequently impacted teeth in humans and can predispose the adjacent second molar to an array of detrimental effects such as caries, periodontitis, and cervical resorption thus the aim of this study was to determine the same. Subjects and Methods: A retrospective observational cross-sectional study involving patients with orthopantomography presenting with impacted lower third molar. The type, depth, and level of impaction, the extent of caries, periodontal changes, and the presence of cervical resorption were assessed. Statistical Analysis Used: Data were analyzed using SPSS version 21.0. with Chi-square. Results: Mesioangular impaction was most commonly noted. The pattern of impaction had a direct influence in the formation of carious lesions, cervical resorption, and periodontal ligament (PDL) changes. Conclusions: Noting the pattern of third molar impaction helps the clinician to forecast problems that may occur on adjacent teeth and initiate necessary prophylactic treatment.
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Aim: To determine the effect of three different dentin hypersensitivity treatment procedures on the microtensile bond strength of etch and rinse and self-etch adhesive system. Materials and Methods: Eighty extracted intact human permanent lower premolars were decoronated, and dentin was exposed on the buccal surface. The teeth were randomly assigned to two experimental groups of 40 teeth each: etch and rinse system or self-etch system. The 40 samples assigned were further randomly assigned to four desensitizing treatment subgroups: Control, Gluma, NovaMin, and GC tooth Mousse with 10 samples per subgroup. Desensitizing treatment was performed two times each day for 2 weeks respectively. The exposed dentin was subjected to etch and rinse or self-etch adhesive system bonding agent as per the group and restored using composite to 4-mm thickness. Samples were then subjected to universal testing machine for microtensile bond strength. Results: The bond strength to the dentin obtained with etch and rinse adhesive system group where significantly higher (P < 0.05) when compared to self-etch adhesive system. However, there was no significant effect of the desensitizing agent on the microtensile bond strength in its own. Scanning electron microscope imaging reviled tubular occlusion in all specimens treated with desensitizer. Conclusion: The bond strength was majorly impacted by the type of adhesive system used. While the desensitizing agents used in the study had little or no adverse effect on the bond strength of composites to dentin surface.
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Abfraction or Theory of Abfraction is a theory explaining the non-carious cervical lesions (NCCL). It suggests that they are caused by flexural forces, usually from cyclic loading; the enamel, especially at the cementoenamel junction (CEJ), undergoes this pattern of destruction by separating the enamel rods. Clinical aspect importance of these ineart lesions are at most important to be detected for early intervention and treatment modalities as options during the progression of the disease. How to cite this article: Shetty SM, Shetty RG, Mattigatti S, Managoli NA, Rairam SG, Patil AM. No Carious Cervical Lesions: Abfraction. J Int Oral Health 2013; 5(5):142-5.
