Influence of Fiber Type on Fatigue Performance of Fiber-Reinforced Inlay-Retained Dental Prostheses

Area of Science:

• Dental Materials Science
• Biomaterials Engineering
• Restorative Dentistry

Background:

• Composite inlay-retained prostheses are widely used for restoring posterior teeth.
• Fatigue resistance is a critical factor for the longevity of these restorations.
• Periodontal support significantly influences the biomechanical behavior of dental prostheses.

Purpose of the Study:

• To evaluate the impact of different configurations of long and short glass fibers on the fatigue resistance of composite inlay-retained prostheses.
• To assess the influence of periodontal support levels on the fatigue performance of these restorations.

Main Methods:

• Seventy-two endodontically treated mandibular molars and premolars were prepared and restored with direct inlay-retained composite prostheses.
• Prostheses were fabricated using long fibers only, short fibers only, or a combination of both.
• Specimens were subjected to fatigue testing under simulated physiological or furcation-involved periodontal support.

Main Results:

• The combination of long and short fibers demonstrated the highest load-bearing capacity and fatigue resistance.
• Restorative material composition significantly impacted load-bearing capacity, irrespective of periodontal support.
• Group 2A (physiological support) and 2B (furcation involvement) showed superior survival rates and load capacities.

Conclusions:

• The use of combined long and short glass fibers significantly enhances the fatigue resistance of direct inlay-retained composite prostheses.
• This fiber reinforcement strategy can mitigate the negative effects of reduced periodontal support.
• Improved fatigue resistance may lead to better clinical outcomes for patients with compromised molar support.