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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 Importance of a preoperative radiographic scale for evaluating surgical difficulty of impacted mandibular third molar extraction Abstract O b j e c t i v e Natalia Ribes Lainez,a José Carlos Sanchis Gonzáleza, David Peñarrocha Oltraa & José María Sanchis Bielsaa, b a Department of Stomatology, Faculty of Medicine and Odontology University of Valencia, Valencia, Spain b Department of Stomatology and Maxillofacial Surgery, General University Hospital of Valencia, Spain The objectives of the study were to evaluate the correlation between the degree of surgical dificulty measured by an established scale and the total surgical time, the ostectomy time and the tooth sectioning time, and to analyze which of the factors involved had a greater influence on total surgical time. C o r r e s p o n d i n g a u t h o r : Dr. David Peñarrocha Oltra Cirugía Bucal. Clínicas Odontológicas C/Gascó Oliag, 1 46021 Valencia Spain T +34 963 86 4144 david.penarrocha@uv.es H o w t o c i t e t h i s a r t i c l e : How to cite this article: Ribes Lainez N, Sanchis González JC, Peñarrocha Oltra D, Sanchis Bielsa JM. Importance of a preoperative radiographic scale for evaluating surgical dificulty of impacted mandibular third molar extraction. J Oral Science Rehabilitation. 2017 Mar;3(1):52–9. M a t e r i a l s a n d m e t h o d s A presurgical radiographic scale was developed, based on ten parameters. Each parameter was scored from 1 to 3, and the individual scores were summed. A retrospective analysis using panoramic radiographs was performed of patients subjected to surgical extraction of a mandibular third molar, with recording of the surgical times. A statistical analysis was performed to establish correlations between the study parameters and scale and the surgical times. R e s u l t s A greater Winter’s distance prolonged ostectomy time and, conversely, a greater distance from the mandibular ramus to the distal surface of the second molar was observed to shorten ostectomy time. Separate or dys- morphic root shape increased ostectomy time and total surgical time. Total surgical time was longer in the presence of greater coronal width and a shorter distance from the ramus to the second molar. The only variable correlated to tooth sectioning time was coronal width. C o n c l u s i o n The final score was correlated to ostectomy time and total surgical time. Ostectomy time in turn was influenced by Winter’s distance, the distance from the mandibular ramus to the second molar, and root shape. Tooth sectioning time was influenced by the coronal width of the third molar. The parameters with the closest correlation to total surgical time were coronal width and the distance between the ramus and second molar. K e y w o r d s Third molar surgery, wisdom teeth, impacted mandibular third molar, third molar extraction. 52 Volume 3 | Issue 1/2017 Journal of Oral Science & Rehabilitation