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': 'What is the use of boxing an impression? \nSelect and explain. \nA. Ease of construction of denture, B. Preserving the sulci, C. Ease of pouring an impression, D. All of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: BOXING WAX AND BEADING WAX\xa0\nUSES\xa0\nUsed to build up vertical walls around the impression, in order to pour the stone and make a cast. The procedure is known as boxing.\xa0\nSUPPLIED AS\xa0\nBoxing wax as sheets, beading wax as strips.\nADVANTAGES OF BEADING AND BOXING\xa0\n\nPreserves the extensions and landmarks.\xa0\nControls the thickness of the borders.\xa0\nControls the form and thickness of the base of the cast.\xa0\nConserves the artificial stone.\xa0\n\nPROPERTIES\xa0\nThey are pliable and can be adapted easily. A slight tackiness allows it to stick to the impression.\nNote: The terms carding wax and boxing wax have been used interchangeably. Carding wax was the original material on which porcelain teeth were fixed when received from the manufacturer. Boxing wax is a more acceptable term.', 'role': 'assistant'}]