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Oral Health-related quality of life after coronectomy for impacted mandibular third molar1116imported into a database. The data also included two demographic variables: the age at surgery (years) and sex. Gregory and Pell’s classification of the third molar position was used to describe the degree and type of mandibular impaction.Statistical analysisConventional descriptive statistics were performed to characterize the patient sample. The Shapiro-Wilk test showed that all the outcome variables in this study were normally distributed (p>0.05). Repeated measures ANOVA was used to assess the mean differences of OHIP- and pain scores over time from day 1 to day 7. If the overall p-value of the repeated measures ANOVA was smaller than 0.05, pairwise comparison was used to test differences between any two time points. Pearson’s correlation test was performed to analyze correlations between different variables. The independent sample t-test was used to determine if there was a significant difference in OHIP-14 scores, pain scores and analgesic intake between the male and female variables on each postoperative day. The one-way ANOVA tests were used to determine if there were statistically significant differences in the means of pain and OHIP-14 scores between the different categories of the Pell and Gregory degrees of impact, separately. ResultsData from 50 patients were available for analysis, including 13 (26%) males and 37 (74%) females. The mean ages were 25 years (range: 19 to 35) for males and 25 years (range: 18 to 36) for females. The treated third molar was on the left side in 30 patients and on the right side in 20 patients. The treated molar alignments included 60% mesioangular, 24% horizontal, and 16% vertical (Table 1). The degree of impaction varied from grades 1A to grade 3B, according to Gregory and Pell’s classification.