This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
[{'content': 'The procedure involving maximum tooth structure removal is: \nSelect and explain. \nA. Enameloplasty, B. Air abrasion, C. Preventive resin restoration, D. Prophylactic odontotomy', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Current factors that dictate extension on smooth surfaces include\n\nThe extent of caries or injury.\xa0\nThe restorative material to be used.\n\nLikewise, extension for prevention to include the caries-prone areas on occlusal surfaces has been reduced by treatments that conserve tooth structure. Such treatments may include\xa0 enameloplasty, application of pit-and-fissure sealant, and preventive resin or conservative composite restoration.\nLikewise, the adjacent tooth contour may dictate specific preparation extensions that enable the creation of appropriate proximal restoration form.\n“Prophylactic odontotomy” procedures were used in the past. These more aggressive procedures involved preparing developmental or structural imperfections of the enamel that were thought to be at increased risk of caries and filling the preparation with amalgam to prevent caries from developing in these sites. Prophylactic odontotomy is no longer advocated as a preventive measure.\xa0\nReference: Sturdevant operative dentistry 7th\xa0 \xa0EDITION, Page No:125', 'role': 'assistant'}]