MTA Properties — MFDS Part 1 MCQ

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ModerateDental MaterialsMTA PropertiesMFDS Part 1

When conventional mineral trioxide aggregate (MTA) is selected instead of calcium hydroxide for direct pulp capping, which property most strongly supports this choice?

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Correct answer: E — More predictable reparative dentine barrier formation

MTA produces a more predictable reparative dentine barrier than calcium hydroxide and is associated with higher direct pulp-capping success and less pulpal inflammation. It is also a hydraulic calcium silicate cement, so water supports rather than prevents its setting in the moist pulpal environment. The other options describe disadvantages of conventional MTA rather than reasons for choosing it: it is relatively expensive, has a prolonged setting time, may cause discolouration and can be difficult to manipulate and place. Newer modified calcium silicate materials have been developed partly to improve these limitations.

Reference: Paula AB et al. Direct Pulp Capping: What is the Most Effective Therapy?—Systematic Review and Meta-Analysis. Journal of Evidence-Based Dental Practice. 2018;18(4):298–314. https://pubmed.ncbi.nlm.nih.gov/40256699/