Dental pulp inflammation; experimental studies in human and monkey teeth.

Area of Science:

• Dental research
• Microbiology
• Inflammation studies

Background:

• Dental pulp inflammation is primarily caused by oral bacteria and their products.
• Previous research over 15 years supports bacteria as the main etiological factor.

Purpose of the Study:

• To determine the irritating effects of oral bacterial components and restorative materials on dental pulp.
• To understand the reaction patterns of inflamed dental pulp tissue.

Main Methods:

• Bacterial materials and silicate cement were applied to Class V cavities in human/monkey teeth.
• Pulp response evaluated after short (8h) and long (150d) exposure.
• Stereo morphometric technique developed for evaluating pulp reactions.
• Chemotactic effects tested in rat wound chambers.

Main Results:

• Bacterial components showed varying capacities to induce pulpal inflammation over exposed dentin.
• Early inflammatory response severity was not altered by decomplementation.
• Long-term exposure to bacterial products often resulted in healing and repair, even in severely inflamed pulp.
• Calcium hydroxide reduced silicate cement's pulp irritation but yielded limited secondary dentin.

Conclusions:

• Oral bacteria are significant irritants to dental pulp, with varied inflammatory potential.
• Dental pulp exhibits healing and repair capabilities when challenged by bacterial products over time.
• Calcium hydroxide can mitigate restorative material irritation but has limited regenerative effects.