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The Effect of Composite Thickness on the Stress Distribution Pattern of Restored Premolar Teeth with Cusp Reduction
Author(s) -
Panahandeh Narges,
Torabzadeh Hassan,
Ziaee Nargess,
Mahdian Mina,
Tootiaee Bahman,
Ghasemi Amir
Publication year - 2017
Publication title -
journal of prosthodontics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.902
H-Index - 60
eISSN - 1532-849X
pISSN - 1059-941X
DOI - 10.1111/jopr.12422
Subject(s) - cusp (singularity) , premolar , materials science , reduction (mathematics) , von mises yield criterion , composite number , stress (linguistics) , composite material , orthodontics , dentistry , mathematics , medicine , geometry , structural engineering , molar , engineering , linguistics , philosophy , finite element method
Purpose Different thicknesses of restorative material can alter the stress distribution pattern in remaining tooth structure. The assumption is that a thicker composite restoration will induce a higher fracture resistance. Therefore, the present study evaluated the effect of composite thickness on stress distribution in a restored premolar with cusp reduction. Materials and Methods A 3D solid model of a maxillary second premolar was prepared and meshed. MOD cavities were designed with different cusp reduction thicknesses (0, 0.5, 1, 1.5, 2.5 mm). Cavities were restored with Valux Plus composite. They were loaded with 200 N force on the occlusal surface in the direction of the long axis. Von Mises stresses were evaluated with Abaqus software. Results Stress increased from occlusal to gingival and was maximum in the cervical region. The stressed area in the palatal cusp was more than that of the buccal cusp. Increasing the thickness of composite altered the shear stress to compressive stress in the occlusal area of the teeth. Conclusion The model with 2.5 mm cusp reduction exhibited the most even stress distribution.