Aim: The successful anesthesia is an essential factor for dental treatment. This study aimed at determining the effectiveness of local anesthesia and it’s relationship with dental Anxiety. Methods: This cross-sectional study was carried out on 256 dental patients, in 2017. Dental Anesthesia was administered after completing the Modified Dental Anxiety Scale by the patients. The level of anesthesia was recorded in one of three states (successful, difficult, and failed). Collected data was analyzed using SPSS version 22 and tests of, Chi-square, independent t-test, analysis of variance, and logistic regression model. Results: About 60.5% subjects had moderate-severe dental anxiety. The mean of dental anxiety significantly was lower in the successful anesthesia group (P<0.01). Patients with elementary education had a significantly higher level of dental anxiety (P<0.01). Dental anxiety was significantly higher in the age group of ≥59 years, compared to the other age groups, except for 49-58 years (P<0.05). Subjects with a significantly higher level of dental anxiety more delayed their visits to the dentist. The logistic regression model showed that the dental anxiety (high anxiety) and literacy level (elementary) were the most important predictors of failed or difficult anesthesia. Conclusion: Informing patients about dental treatment procedures, regular and periodic visits to the dentist, using psychotherapeutic techniques to reduce dental anxiety before anesthesia, could play an important role in the success of anesthesia.
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