Stress distribution in alveolar bone around implants under implant supported overdenture with linear occlusion at lateral occlusion
10.3321/j.issn:1002-0098.2008.12.011
- VernacularTitle:侧方(牙合)时线性(牙合)种植覆盖全口义齿下颌种植体周围骨组织的应力分布
- Author:
Ya-Lin LU
1
;
Qi-Guo RONG
;
Hang-Di LOU
;
Jian DONG
;
Jun XU
Author Information
1. 首都医科大学附属北京安贞医院
- Keywords:
Dental implantation;
Denture,complete;
Finite element analysis;
Linear occlusion
- From:
Chinese Journal of Stomatology
2008;43(12):744-747
- CountryChina
- Language:Chinese
-
Abstract:
Objective To analyze stress distribution in alveolar bone around implants of implant supposed overdentures(ISO)with linear occlusion and with anatomic occlusion at lateral mandibular position,and to iustify the possibility of decreased injurious force around implants in ISO with linear occlusion.Methods Computerized tomography scan and finite element analysis(FEA)were used to set up two 3-D FEA models of maxillae and mahdible with severe residual ridge resorption.The mucosa,linear and anatomic occlusal ISO with bar attachments,and two implants inserted between mandibulat foramina were also established in the models.With the condition of imitating the loading of masseter muscles,these models were loaded to simulate the stress distributious in alveolar bone around implants under ISO at lateral occlusion position.Results At lateral occlusion,the stress distributions in alveolRr bone around implants under ISO with anatomic occlusion were mairdy on the lingual and distal sides of the working side implants.However,stress distributions under ISO with linear occlusion were on the distal sides of bilateral implants.Both the stress peaks of ISOs with linear occlusion and with the anatomic one appeared in the working side.In anatomic occlusion model,σz:-6.47 MPa and 6.81 MPa,σl:-4.20 MPa and 7.20 MPa(negative value:compressive stress,positive value:tensile stress);in linear occlusion model,σz:-4.86 MPa and 3.04 MPa,σl:-3.48 MPa and 5.33 MPa.Conclusions At lateral occlusion,when comparing the ISO with two different occlusion schemes,stress peak in alveolar bone around implants in the linear occhsion model was lower than tllat in the anatomic occlusion model at equal loading situation.Stress in the alveolar bone under ISO with linear occlusion distributed more evenly than that under ISO with anatomic occlusion.
