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Ca/P mol ratio of cries-affected dentin structures.

Z K Hashemi1, Y Oshida, J J Deely

  • 1Graduate Prosthodontics, Indiana University School of Dentistry, Indianapolis, IN 46202-5186, USA.

Bio-Medical Materials and Engineering
|July 13, 2005
PubMed
Summary

Minimum intervention dentistry preserves tooth structure by not always removing all carious dentin. Caries-affected dentin shows increased chemical activity compared to healthy dentin, impacting bonding quality.

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Area of Science:

  • Dental Materials Science
  • Caries Research
  • Biomaterials

Background:

  • Minimum intervention (MI) dentistry aims to preserve tooth structure by selectively removing carious lesions.
  • Understanding the chemical properties of caries-affected dentin is crucial for optimizing bonding procedures in MI approaches.

Purpose of the Study:

  • To characterize the surface properties of caries-affected dentin compared to caries-free dentin.
  • To evaluate the chemical activity and mineral content (Ca/P ratio) of different dentinal substrates.

Main Methods:

  • Three groups of teeth were studied: caries-free (CF), chemically demineralized (CC), and naturally carious (ND).
  • Surface properties were assessed using contact angle measurements.
  • Mineral composition was analyzed using electron-probe microanalysis to determine the Ca/P molar ratio.

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Main Results:

  • Caries-affected dentin surfaces (CC and ND) exhibited significantly lower contact angles than caries-free dentin (CF), indicating higher surface energy and wettability.
  • The Ca/P molar ratio was significantly different between groups (p<0.05), with CC showing a lower ratio (1.324) compared to CF (1.549) and ND (1.568).
  • Weibull analysis revealed differences in the homogeneity of Ca/P ratios among the groups.

Conclusions:

  • Caries-affected dentin, whether naturally occurring or chemically induced, is significantly more chemically active than caries-free dentin.
  • The reduced Ca/P molar ratio in chemically created caries suggests altered mineral content that may influence bonding efficacy.