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Analysis of the Stress Distribution Pattern of Anatomic and Non-Anatomic Tooth Forms on Maxillary and Mandibular Edentulous Ridges—A photoelastic study

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Journal of Biosciences and Medicines 2020年第6期8卷 113-126页

作者： T. K. Chandrathara M. Lovely Eldo Koshy Jitendra Jethwani Department of Prosthodontics Sri Sankara Dental College Trivandrum India Department of Prosthodontics Ras Al-Khaimah College of Dental Sciences Ras Al Khaimah UAE Dr. Koshy’s Dental Clinic Cochin India School of Dentistry Virginia Commonwealth University Richmond VA USA

Aim: To compare the type of stress distribution pattern occurring with anatomic and non-anatomic tooth forms beneath a complete denture in both maxillary and mandibular arch. Methodology: A photoelastic model of the edentulous maxillary and mandibular ridge was prepared meticulously to simulate the human mandible and maxilla. Two sets of acrylic teeth with anatomic and non-anatomic occlusal forms were used to fabricate upper and lower dentures. A vertical static load of 100 N was applied through the mandibular model to the maxillary model. After load application on the dentures the photoelastic model as well as the upper and lower complete dentures were sectioned in the midline. The sectioned photoelastic model was viewed through a polariscope to observe the fringe pattern indicating varying amounts of stress distribution. In this study, a two-dimensional photoelastic stress analysis technique was utilized. Results: Force per unit area was observed more in anatomic teeth than the non-anatomic counterpart. Hence anatomic tooth forms may increase the possibility of bone resorption rate over a period of time. However, in non-anatomic lower teeth, a decrease in value was observed from posterior to anterior region. Conclusion: Stress of greater magnitude was observed with cuspal teeth whereas non-anatomic (0°) showed slightly less magnitude of stress. Depending upon the clinical situation the clinician needs to choose the type of occlusal tooth forms for edentulous patients.

关键词： Complete Denture Anatomic Tooth Forms Non Anatomic Tooth Forms Stress Distribution photoelastic study

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