Hipersensibilidade dentinária: prevalência, fatores de risco e protocolos de tratamento - uma avaliação laboratorial, transversal, clínica e revisões sistemáticas da literatura ; Dentin hypersensitivity: prevalence, risk factors and treatment protocols - a laboratory, transversal, clinical evaluation and systematic reviews

Dentin hypersensitivity (DH) is a condition with high prevalence and incidence rates, which influences the quality of life of the world population. The proposal of this study was to assess the prevalence and risk factors involved in the development of DH, as well as, the perception of Brazilian dentists about this condition and the efficacy of desensitizing clinical protocols. This study was divided into six chapters; chapter 1: to systematically review cross-sectional studies to estimate the prevalence of DH in various populations and to investigate factors that might influence variation in the prevalence; chapter 2: to evaluate, by means of a crosssectional study, the risk factors associated with noncarious cervical lesions (NCCLs), DH, gingival recession, and the relationship among these conditions in a specific Brazilian sample population; chapter 3: to investigate by means of a questionnaire, the perception and the clinical routine for DH management among Brazilian dentists; chapter 4: to conduct a systematic review to evaluate the desensitizing effect of galliumaluminium- arsenide (GaAlAs) lasers compared to placebo / no treatment or topical agents applied in the office, considering different follow-up times; chapter 5: to evaluate, by means of a randomized clinical study, the efficacy of different concentrations of potassium oxalate (5 and 10%) in the relieving of DH, after a protocol of four sessions; chapter 6: to evaluate the influence of desensitizing agents on bond strength of self-etch adhesives to dentin submitted to acid-abrasive challenge, using the microtensile bond strength test and analysis of the failure mode. After analyzing the results, it can be concluded that the best estimate of DH prevalence was 11.5% (95%CI:11.3%-11.7%) and the average from all studies was 33.5% (95%CI: 30.2%-36.7%). The NCCLs and gingival recession (GR) distributions increased with age; NCCLs, DH, and GR had positive correlation and were influenced by factors as age, gender, gastric disease, and occlusal trauma. ...