Mousa, Mohammed Assayed Mohammed Assayed
(2024)
Predicting the biomechanics in
aramany class i obturator prostheses
using different designs and materials:
a combined finite element modeling
and experimental study.
PhD thesis, Universiti Sains Malaysia.
Abstract
There is a direct relationship between biomechanics and the success of
maxillofacial prostheses (MFPs). The linear (LDP) and tripodal designs (TDP) are the
only designs used for unilateral MFPs. Besides, most literature showed only Co-Cr-based
obturators. This study explored the biomechanics in obturators for Aramany's Class I
defect using a new design named fully tripodal (FTDP) and seven materials in terms of
retention, stress, and strain using finite element analysis (FEA), photoelastic stress
analysis (PESA), digital image correlation (DIC), and a universal testing machine. Nine
FE models, 30 epoxy resin models (12 for PESA and 18 for DIC), and 54 frameworks
divided into nine for AP retained with Adam's clasps, LDP, TDP, FTDP, PEEK-based,
and biotone-based MFPs were fabricated from casts obtained from archived scanned
human skull. The data on retention, PESA, DIC, and FEA data were collected and
evaluated to identify the displacement, stress, and strain in the MFPs with assorted
designs and materials. Regarding retention, there were no significant differences between
FTDP and TDP regarding retention, stress, and strain. Regarding the materials, the metalbased
produced the highest retention, the highest stress on the abutments, and the lowest
stress and strain on the defective side. The flexible materials-based MFPs demonstrated
the lowest retention, the lowest stress and strain on the abutments of the contralateral
side, and the highest stress and strain on the defective side (P<0.05).
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