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Related Experiment Videos

Smear layer instability caused by hemostatic agents

M F Land1, C C Couri, W M Johnston

  • 1Department of Restorative Dentistry, Southern Illinois University, School of Dental Medicine, Alton, USA.

The Journal of Prosthetic Dentistry
|November 1, 1996
PubMed
Summary
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Different hemostatic agents significantly impact the dentinal smear layer. Stronger solutions like aluminum chloride and epinephrine HCl removed more smear layer than milder astringents.

Area of Science:

  • Dental materials science
  • Biomaterials research
  • Oral histology

Background:

  • The effect of various hemostatic agents on prepared tooth structure, specifically the dentinal smear layer, is not fully understood.
  • Hemostatic agents are commonly used in dentistry to control bleeding, but their interaction with tooth structure requires further investigation.

Purpose of the Study:

  • To compare the efficacy of six common hemostatic solutions and two non-dental astringents in removing the dentinal smear layer.
  • To evaluate the influence of exposure time on the interaction between astringent solutions and dentinal smear layers.

Main Methods:

  • Standardized dentinal smear layers were prepared and exposed to eight different astringent solutions for three time intervals (30, 120, and 300 seconds).
  • Scanning Electron Microscopy (SEM) at 2400x magnification was used to capture images of the treated dentinal surfaces.

Related Experiment Videos

  • A predetermined ranking system was applied to evaluate five categories: smear layer removal and etching of underlying tooth structure.

    • Main Results:

    • Significant differences in smear layer removal and tooth structure etching were observed based on the type of solution, exposure time, and their interaction (p < 0.001).
    • The most effective agents for smear layer removal at longer exposure times were 21.3% aluminum chloride hexahydrate (AlCl3-6 hydrate), 8% racemic epinephrine HCl, and 15.5% ferric sulfate (Fe2(SO4)3).
    • These potent agents demonstrated significantly greater smear layer removal compared to near pH-neutral agents like tetrahydrozoline and oxymetazoline (p < 0.05).

    Conclusions:

    • The choice of hemostatic agent and duration of application significantly influence the condition of the dentinal smear layer.
    • Stronger acidic astringents, such as aluminum chloride and ferric sulfate, and epinephrine HCl are more effective in removing the smear layer compared to milder, near-neutral agents.