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[Effect of different decalcification condition on tooth-clearing technique].

Ying Li1, Meng-Yu Zhou, Wei-Dong Niu

  • 1Dept. of Oral Medicine, School of Stomatology, Dalian Medical University, Dalian 116044, China.

Hua Xi Kou Qiang Yi Xue Za Zhi = Huaxi Kouqiang Yixue Zazhi = West China Journal of Stomatology
|March 28, 2009
PubMed
Summary

Using 3% nitric acid with oscillation at 20°C for decalcification offers the best results for tooth clearing, requiring less time and causing minimal shrinkage.

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Area of Science:

  • Dental materials science
  • Biomaterials
  • Chemical processing of teeth

Background:

  • Tooth clearing techniques are crucial for endodontic research and diagnostics.
  • Nitric acid is commonly used for decalcification, but its effects on tooth shrinkage need optimization.
  • Understanding the impact of temperature, concentration, and oscillation on nitric acid decalcification is essential.

Purpose of the Study:

  • To evaluate the shrinkage range of cleared human teeth using nitric acid under varying temperatures and concentrations.
  • To determine the optimal conditions for nitric acid decalcification to minimize tooth shrinkage and time consumption.

Main Methods:

  • 48 human teeth were prepared, filled, and divided into six groups based on nitric acid temperature (20°C, 30°C), concentration (3%, 6%), and oscillation.

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  • Specimens underwent decalcification, dehydration, and clearing with methyl salicylate.
  • Time taken for decalcification and the shrinkage range of specimens were recorded and analyzed.

    • Main Results:

    • Group E (30°C, 6% nitric acid, oscillate) showed the fastest decalcification time.
    • Specimen anastole (shrinkage) varied significantly between groups (P < 0.05).
    • Group C (20°C, 3% nitric acid, no oscillate) had the slowest decalcification and significant shrinkage compared to other groups.

    Conclusions:

    • Decalcification using 3% nitric acid with oscillation at 20°C is effective, requiring less time and resulting in minimal tooth shrinkage.
    • These conditions yield the best outcomes for the tooth-clearing technique.