Dentin permeability. Effects of desensitizing dentifrices in vitro

Area of Science:

• Dentistry
• Biomaterials Science
• Oral Health Research

Background:

• Hypersensitive dentin is a common clinical issue.
• Previous studies indicate placebo dentifrices can reduce dentin sensitivity over time.
• A potential mechanism involves reduced dentin permeability due to decreased hydrodynamic fluid movement.

Purpose of the Study:

• To test the hypothesis that dentifrice abrasiveness reduces dentin permeability.
• To investigate the in vitro effect of various dentifrices on dentin hydraulic conductance.
• To compare the efficacy of marketed desensitizing dentifrices with an experimental oxalate-containing dentifrice.

Main Methods:

• Dentin discs were used for in vitro testing.
• Hydraulic conductance of dentin was measured before and after brushing with different dentifrices.
• The ease of fluid flow across dentin was quantified to assess permeability.

Main Results:

• All tested dentifrices significantly decreased dentin hydraulic conductance.
• An experimental dentifrice containing oxalate demonstrated superior efficacy in reducing hydraulic conductance compared to marketed products.
• The findings support the role of abrasive action in reducing dentin permeability.

Conclusions:

• Dentifrice use, particularly abrasive action, contributes to reduced dentin permeability.
• This reduction in permeability likely explains a portion of the clinical improvement in dentin sensitivity.
• Oxalate-based dentifrices show promise for enhanced desensitizing effects.