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E v a l u a t i o n o f s u r g i c a l d i f f i c u l t y o f e x t r a c t i o n a a a b b b c c c Figs. 1a–c Figs. 2a–c Figs. 3a–c Figs. 1a–c Inclination of third molar: (a) vertical (1); (b) mesial (2); and (c) distal or horizontal (3). Figs. 2a–c Inclination of second molar: (a) mesial (1); (b) vertical (2); and (c) distal (3). Figs. 3a–c Pericoronal radiolucency: (a) large (1); (b) small (2); and (c) not visible (3). as follows for statistical processing: 1 = not difi- cult (10–16 points), 2 = average dificulty (17– 23 points) and 3 = dificult (24–30 points). The data were processed using the SPSS statistical package (IBM SPSS Statistics for Windows, Ver- sion 21.0, IBM, Armonk, N.Y., U.S.). Normal dis- tribution of the variables was evaluated by the Kolmogorov–Smirnov test and was confirmed in all cases. Multivariate analysis was performed, involving the estimation of a general linear mul- tiple regression model for the selected response variable (time) as a function of the study param- eters and surgical dificulty scores. The accepted level of statistical significance was 5% ((cid:696) = 0.05). Results One hundred patients (41 men and 59 women) between 18 and 45 years of age (mean age of 24.9 ± 6.5 years) were analyzed. Mandibular left (n = 49) and right (n = 51) third molars were ex- tracted. The maximum final score was 27 points, with a minimum final score of 13 (mean final 54 Volume 3 | Issue 1/2017 Journal of Oral Science & Rehabilitation