Influence of Crown Shape of First Molar on the Wear Performance of Denture
The shape of the denture crown has an important effect on the wear performance of the denture,and a appro-priate shape of the denture crown can effectively increase the service life of the denture.The influence of denture angle and marginal ridge on denture wear was studied with the first molar of mandibular right side as the research subject.The stand-ard tooth was scanned,and the 3D jaw model was reconstructed.The missing tooth was designed with the help of denture design software exocad.By changing the inclination of the tooth tip(flat 20°,medium 30°,sharp 40°)and marginal ridge height(including low marginal ridge on both sides,buccal high marginal ridge and high marginal ridge on both sides),9 different combinations of denture structures were established.The model and the designed denture were imported into the fi-nite element software Abaqus for chewing stress analysis.A chewing robot was used to carry out the denture wear experi-ment and analyze its wear condition.The results show that in the inclination range of 20° to 40° of the tooth tip,when mar-ginal ridge is low,for every 10° increase in tooth tip inclination,the maximum stress value and the average major wear stress increase by 5.05 MPa and 0.75 MPa,respectively.However,when the marginal ridge is high,for every 10° increase in tooth tip inclination,the maximum stress and main wear stress increase by 3.61 MPa and 0.31 MPa,respectively.Under the same chewing conditions,the higher the inclination of the tooth tip,the greater the denture wear,and the higher marginal ridge can improve the denture wear.
万方数据
维普
