Abstract
Statement of problem
Computer-aided design (CAD) of maxillofacial prostheses is a hardware-intensive process.
The greater the mesh detail is, the more processing power is required from the computer.
A reduction in mesh quality has been shown to reduce workload on computers, yet no
reference value of reduction is present for intraoral prostheses that can be applied
during the design.
Purpose
The purpose of this simulation study was to establish a reference percentage value
that can be used to effectively reduce the size and polygons of the 3D mesh without
drastically affecting the dimensions of the prosthesis itself.
Material and methods
Fifteen different maxillary palatal defects were simulated on a dental cast and scanned
to create 3D casts. Digital bulbs were fabricated from the casts. Conventional bulbs
for the defects were fabricated, scanned, and compared with the digital bulb to serve
as a control. The polygon parameters of digital bulbs were then reduced by different
percentages (75%, 50%, 25%, 10%, 5%, and 1% of the original mesh) which created a
total of 105 meshes across 7 mesh groups. The reduced mesh files were compared individually
with the original design in an open-source point cloud comparison software program.
The parameters of comparison used in this study were Hausdorff distance (HD), Dice
similarity coefficient (DSC), and volume.
Results
The reduction in file size was directly proportional to the amount of mesh reduction.
There were minute yet insignificant differences in volume (P>.05) across all mesh groups, with significant differences (P<.001) in HD. The differences were, however, only found with DB1. DSC showed a progressive
dissimilarity until DB25 (0.17%), after which the increase was more prominent (0.46%
to 4.02%).
Conclusions
A reduction of up to 75% polygons (25% of the original mesh) was effectively carried
out on simulated casts without substantially affecting the amount of similarity in
volume and geometry.
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Article info
Publication history
Published online: February 15, 2021
Footnotes
Supported in part by Deputyship for Research & Innovation, Ministry of Education in Saudi Arabia grant no. 681196980 and Central Laboratory at Jouf University.
Identification
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© 2020 by the Editorial Council for <ce:italic>The Journal of Prosthetic Dentistry</ce:italic>.
