Human pulpal response to mineral trioxide aggregate (MTA): a histologic study

Area of Science:

• Dentistry
• Biomaterials Science
• Regenerative Medicine

Background:

• Pulpotomy is a vital pulp therapy procedure aiming to preserve pulp vitality.
• Calcium hydroxide has been a traditional material for pulpotomy but can have limitations.
• Mineral Trioxide Aggregate (MTA) is a newer biomaterial with potential advantages in pulp capping.

Purpose of the Study:

• To histologically compare the efficacy of Mineral Trioxide Aggregate (MTA) versus Calcium hydroxide in promoting dentin bridge formation and assessing pulpal inflammation after pulpotomy.
• To evaluate the biocompatibility and regenerative potential of MTA as a pulpotomy agent.

Main Methods:

• Premolar teeth underwent pulpotomy and radicular pulp capping with either MTA or Calcium hydroxide.
• Restorations were placed using Intermediate Restorative Material (IRM).
• Teeth were extracted at 4 and 8 weeks, demineralized, sectioned longitudinally, and examined histologically under a light microscope.

Main Results:

• Mineral Trioxide Aggregate (MTA) consistently demonstrated superior dentin bridge formation, characterized by a more homogenous and continuous structure compared to Calcium hydroxide.
• Pulpal inflammation was significantly reduced in teeth treated with MTA at both 4 and 8-week intervals when compared to those treated with Calcium hydroxide.
• Histologic evaluation confirmed MTA's effectiveness in promoting a favorable healing response.

Conclusions:

• Mineral Trioxide Aggregate (MTA) is a highly effective material for pulpotomy, yielding superior dentin bridge formation and reduced pulpal inflammation compared to Calcium hydroxide.
• MTA shows promising potential as a biomaterial for vital pulp therapy, facilitating better healing and tissue regeneration.
• These findings support the use of MTA in clinical pulpotomy procedures for improved outcomes.