|Stress area of the mandibular alveolar mucosa under complete denture with linear occlusion at lateral excursion|
|Lue Ya-lin2; Lou Hang-di3; Rong Qi-guo3; Dong Jian2; Xu Jun1|
|关键词||complete denture linear occlusion stress area distribution finite element analysis|
|刊名||CHINESE MEDICAL JOURNAL|
|WOS标题词||Science & Technology|
|类目[WOS]||Medicine, General & Internal|
|研究领域[WOS]||General & Internal Medicine|
|关键词[WOS]||IMPLANTS ; MASTICATION ; PRESSURE|
Background The rocking and instability of a loaded complete denture (CD) during lateral excursion reduce the bearing area under the denture base, causing localized high stress concentrations. This can lead to mucosal tenderness, ulceration, and alveolar bone resorption, and the linear occlusion design was to decrease the lateral force exerted on the denture and to ensure denture stability. But it is not known how the bearing areas of linear occlusal CDs (LOCDs) and anatomic occlusal CDs (AOCDs) differ. The purpose of this study was to analyze and compare the distributions of the high and low vertical stress-bearing areas in the mandibular alveolar mucosa under LOCDs and AOCDs at lateral excursion.
Methods Computerized tomography (CT) and finite element analysis were used to establish three-dimensional models of an edentulous maxilla and mandible with severe residual ridge resorption. These models were composed of maxillary and mandibular bone structure, mucosa, and the LOCD or AOCD. Lateral excursion movements of the mandible were simulated and the vertical stress-bearing areas in the mucosa under both mandibular CDs were analyzed using ANSYS 7.0.
Results On the working side, the high stress-bearing (-0.07 to -0.1 MPa) area under the LOCD during lateral excursion was smaller than that under the AOCD, while the medium stress-bearing (-0.03 to -0.07 MPa) area under the LOCD was 1.33-fold that under the AOCD. The medium stress-bearing area on the non-working side under the LOCD was 2.4-fold that under the AOCD. Therefore, the overall medium vertical stress-bearing area under the LOCD was 20% larger than that under the AOCD.
Conclusions During lateral excursion, the medium vertical stress-bearing area under a mandibular LOCD was larger and the high vertical stress-bearing area was smaller than that under an AOCD. Thus, the vertical stress under the LOCD was distributed more evenly and over a wider area than that under the AOCD, thereby improving denture stability. Chin Med J 2010;123(7):917-921
|资助机构||Beijing Natural Science Foundation, China|
|作者单位||1.Peking Univ, Coll Engn, Beijing 100871, Peoples R China|
2.Peking Univ, Dept Prosthodont, Sch & Hosp Stomatol, Beijing 100081, Peoples R China
3.Capital Med Univ, Ctr Stomatol, Beijing Anzhen Hosp, Beijing 100029, Peoples R China
|Lue Ya-lin,Lou Hang-di,Rong Qi-guo,et al. Stress area of the mandibular alveolar mucosa under complete denture with linear occlusion at lateral excursion[J]. CHINESE MEDICAL JOURNAL,2010,123(7):917-921.|
|APA||Lue Ya-lin,Lou Hang-di,Rong Qi-guo,Dong Jian,&Xu Jun.(2010).Stress area of the mandibular alveolar mucosa under complete denture with linear occlusion at lateral excursion.CHINESE MEDICAL JOURNAL,123(7),917-921.|
|MLA||Lue Ya-lin,et al."Stress area of the mandibular alveolar mucosa under complete denture with linear occlusion at lateral excursion".CHINESE MEDICAL JOURNAL 123.7(2010):917-921.|