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': 'A 24 year old male presents to OPD with sensitivity to cold water. On intraoral examination, 46 is carious and dentist decides to restore the teeth with amalgam restorative material with zinc polyacrylate base. All the following statements are true regarding this base, except \nSelect and explain. \nA. Adheres chemically to the natural tooth, B. Biocompatible compared to zinc phosphate cement, C. Stronger than zinc phosphate cement, D. The large molecular size of polyacrylic acid molecules limits its flow into the pulp', 'role': 'user'}, {'content': 'Answer: C \nExplanation: The compressive strength of polycarboxylate cement is approximately 55 MPa, which is lower than that of zinc phosphate cement. Polycarboxylate cements produce minimal irritation to the pulp. The larger size of the polyacrylic acid molecules compared with those of phosphoric acid limits acid penetration into the dentinal tubules, contributing to the excellent biocompatibility and lack of postoperative sensitivity of polycarboxylate cement. Zinc polycarboxylate cement has the potential to adhere chemically to the natural tooth.\nReference: Philips’ 12th ed, P: 320', 'role': 'assistant'}]