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INVESTIGATION OF STRESS-STRAIN STATE OF "RESTORATION & TOOTH" SYSTEM IN WEDGE-SHAPED DEFECTS BY COMPUTED MODELING
Natalia N Brailko1, Iryna M Tkachenko1, Victor V Kovalenko1
1POLTAVA STATE MEDICAL UNIVERSITY, POLTAVA, UKRAINE.
Wiadomosci Lekarskie (Warsaw, Poland : 1960)
|November 2, 2021
Summary
Wedge-shaped tooth defects increase stress in restorative materials. Adding retention grooves to restorations, especially for defects over 1.5 mm deep, significantly reduces stress and improves longevity.
Area of Science:
- Biomaterials Science
- Dental Biomechanics
- Restorative Dentistry
Background:
- Wedge-shaped defects are common dental issues.
- Understanding stress distribution in restorations is crucial for longevity.
Purpose of the Study:
- To analyze how the size and location of wedge-shaped defects affect stress and strain in dental restorative materials.
- To evaluate the effectiveness of retention grooves in mitigating stress concentrations.
Main Methods:
- Biomechanical analysis of stress-strain state was performed on a jaw bone fragment with canine and premolar inclusion.
- Simulated various loading conditions and defect dimensions.
Main Results:
- Increased depth and width of restored wedge-shaped defects led to higher tangential stress in both adhesive and restorative materials.
- Combined vertical and horizontal loading in lingual-vestibular or vestibular-lingual directions proved most unfavorable.
- Retention grooves reduced maximum tangential stress in the adhesive layer by up to 25%.
Conclusions:
- Retention grooves are advisable for wedge-shaped defects exceeding 1.5 mm in depth.
- For subgingival defects of small height, single retention grooves on gingival or incisal planes are recommended due to practical challenges.
- Implementing retention grooves enhances the longevity of dental restorations.
