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Chemical modification of proroot mta to improve handling characteristics and decrease setting time.

Benjamin S Ber1, John F Hatton, Gregory P Stewart

  • 1Private Practice, Houma, Louisiana, USA.

Journal of Endodontics
|September 25, 2007
PubMed
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Mineral trioxide aggregate (MTA) handling was improved using additives, resulting in better plasticity and faster setting times without compromising compressive strength. This modified MTA offers improved clinical usability for root-end fillings.

Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Dental Materials

Background:

  • Mineral trioxide aggregate (MTA) is an ideal root-end filling material but presents handling challenges.
  • Its granular consistency, slow setting, and initial looseness hinder clinical application.

Purpose of the Study:

  • To improve the handling characteristics of gray MTA.
  • To evaluate the effect of Portland cement industry additives on MTA's properties.

Main Methods:

  • Additives (methylcellulose and calcium chloride) were incorporated into gray MTA.
  • The modified MTA was tested for handling, compressive strength, and setting time.
  • Properties were compared to unmodified MTA.

Main Results:

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  • A 1% methylcellulose and 2% calcium chloride admixture improved MTA handling.
  • Modified MTA exhibited similar compressive strength to unmodified MTA.
  • Setting time was reduced by approximately one-third (57 ± 3 minutes).

Conclusions:

  • Chemically modified MTA demonstrates enhanced handling properties.
  • The modified MTA maintains comparable compressive strength.
  • Faster setting time improves clinical efficiency for root-end filling procedures.