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Effect of continuous pressure on histopathological changes in denture-supporting tissues
1Department of Removable Prosthodontics, Okayama University Dental School, Japan.
Journal of Oral Rehabilitation
|January 1, 1997
Summary
Continuous pressure from experimental dentures caused bone resorption in rats at higher pressures (3.4 and 4.9 kPa). Lower pressure (1.5 kPa) did not induce bone loss, suggesting a threshold for pressure-induced bone resorption.
Area of Science:
- Oral biology
- Biomaterials science
- Tissue engineering
Background:
- Continuous pressure from denture bases can affect underlying bone and soft tissues.
- Understanding the relationship between pressure intensity and tissue response is crucial for denture design.
Purpose of the Study:
- To investigate the histopathological changes in denture-supporting tissues under continuous pressure.
- To determine the correlation between pressure intensity and the extent of tissue damage, specifically bone resorption.
Main Methods:
- Experimental dentures were used to apply continuous pressures (1.5, 3.4, 4.9 kPa) to the palatal mucosa in rats.
- Histopathological analysis was performed to evaluate changes in bone, epithelium, and lamina propria.
- Pressure intensity was correlated with observed histopathological alterations.
Main Results:
- A strong correlation was found between continuous pressure intensity and histopathological changes.
- Bone resorption occurred at 4.9 and 3.4 kPa, but not at 1.5 kPa.
- Tissue recovery was observed with decreased pressure due to bone resorption, but no quantitative bone regeneration was noted.
Conclusions:
- Continuous mechanical pressure from dentures can induce bone resorption in supporting tissues.
- A threshold pressure likely exists for inducing bone resorption, below which no significant bone loss occurs.
- While soft tissues may recover, bone loss is not quantitatively restored, highlighting the importance of pressure management in denture wear.