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Effect of restorative procedures and occlusal loading on cuspal deflection
Santiago González-López1, Francisco De Haro-Gasquet, Miguel Angel Vílchez-Díaz
1Faculty of Dentistry, University of Granada, Granada, Spain. sglopez@ugr.es
Operative Dentistry
|March 16, 2006
Summary
Larger cavity preparations, especially those involving endodontic access and MOD preparations, significantly increase tooth cuspal flexure under occlusal load. This cuspal deflection is more pronounced with higher forces and extensive cavity designs.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
- Restorative Dentistry
Background:
- Tooth structure integrity is crucial for withstanding occlusal forces.
- Cavity preparations and endodontic access can compromise tooth cuspal stiffness.
- Understanding cuspal flexure is vital for predicting restoration longevity and tooth survival.
Purpose of the Study:
- To quantify cuspal flexure in response to increasing cavity preparation size.
- To evaluate the impact of simulated occlusal loading on cuspal deflection.
- To determine the influence of endodontic access and MOD preparations on cuspal stability.
Main Methods:
- Ten extracted maxillary premolars were prepared sequentially: conservative MO, extensive MO, endodontic access, and MOD.
- Simulated occlusal loads of 50N, 100N, and 150N were applied.
- Intercuspal distance was measured using a digital caliper to assess cuspal deflection.
Main Results:
- Both cavity preparation extent and occlusal load significantly affected cuspal deflection.
- At 50N and 100N, MO preparations with or without endodontic access showed similar deflection.
- At 150N, endodontic access increased deflection; MOD preparations dramatically increased it for all loads.
Conclusions:
- Tooth cuspal flexure is directly related to the size of cavity preparations and applied occlusal load.
- Endodontic access and extensive MOD preparations significantly compromise cuspal stability.
- These findings highlight the biomechanical challenges associated with large restorations and endodontically treated teeth.
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