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Dentinal fluid movement associated with loading of restorations
K Hirata1, M Nakashima, I Sekine
1Department of Operative Dentistry, Asahi University, School of Dentistry, Gifu, Japan.
Journal of Dental Research
|June 1, 1991
Summary
Post-operative biting sensitivity after resin composite fillings may stem from dentinal fluid movement. Loading these restorations causes significant fluid shifts and nerve firing, potentially explaining the pain experienced.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Clinical Dentistry
Background:
- Post-operative biting sensitivity is a common issue following the placement of posterior resin composite restorations.
- This sensitivity is often attributed to the movement of dentinal fluid within the tooth structure.
Purpose of the Study:
- To investigate the relationship between loading of posterior resin composite restorations and dentinal fluid movement.
- To examine the effect of loading resin composite restorations on pulpal nerve activity in canine teeth.
Main Methods:
- Extracted human teeth and dog canine teeth were used for the study.
- Occlusal surfaces were restored with amalgam (control) or various resin composites.
- Dentinal fluid movement and pulpal nerve firing in response to occlusal loading were measured.
Main Results:
- Restorations using resin composites showed significantly greater dentinal fluid movement (p < 0.01) under loading compared to amalgam or unoperated controls.
- Loading of resin composite restorations in dog canine teeth induced firing of pulpal nerves.
Conclusions:
- Masticatory pressure on resin composite restorations can induce significant dentinal fluid movement.
- This fluid movement, along with direct nerve stimulation, likely contributes to post-operative biting sensitivity.