Three Dimensional Finite Element Analysis On Three Different Types Of Post And Core To Restore Remnants Of Buccal Wall Of Maxillary First Premolar

Objective:To investigate buccal wall remnants maxillary first premolar restored through three kinds of post and core materials by finite element method, to provide theoretical basis for clinical post and core crown design.Methods:The maxillary first premolar post and core crown restoration model was established by CBCT scanning,divided into three groups according to the materials.Glass fiber-composite group(group A), pure titanium group(group B), cobalt chromium alloy group(group C),each group is divided into: the height of the buccal wall does not reduced(group a) and the height of buccal walls reduce to 1.5 mm(group b).Under 150N45o,90o load on buccal cusp,lingual cusp,fossa,analysis the stress distribution on dentin of buccal walls and root canal restored by different materials.Results:Stress distribution on buccal wall were as follows:group A(12.35 MPa,11.04 MPa,11.76MPa)>group B(11.06 MPa,10.15 MPa,10.97MPa)>C(10.71 MPa,9.89 MPa,10.43MPa),stress distribution on root canal were as follows: group C(22.73 MPa,22.12 MPa,22.71MPa)>group B(18.32 MPa,17.95 MPa,18.29MPa)>group A(11.58 MPa,11.41 MPa,11.56MPa),there is no significance between group a: buccal cusp(12.35 MPa,11.06 MPa,10.71MPa),fossa(11.04 MPa,10.15 MPa,9.89MPa),lingualcusp(11.76 MPa,10.97 MPa,10.43MPa)and group b: buccal cusp(12.58 MPa,10.96 MPa,9.85MPa),fossa(11.87 MPa,10.21 MPa, 9.01MPa), lingual cusp(12.16 MPa, 10.99 MPa, 9.77MPa).Conclusion:The maxillary first premolars remnants of buccal wall restored by post and core modulus of elasticity materials is moderation can reduce the risk of failed.And there is no significance whether buccal wall reduce the height or not.