الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
. d was carried out to evaluate
A 3D finite element analysIs stu y
. lex produced from
d’ t ”bution in the craniomaxillary comp
stress IS n d d osseo-
. f expansion techniques: teeth supporte an
dIfferent types 0
integrated screws supported devices.
d d scanned by CT scanner The analytical model was selecte an
” M” software program was
to get the ideal geometrical outlme. IffilCS. .
”d th CT images. Three dimenslOnal drawmg of
used to edit an crop e . .
ts done bv tracing every CT cut m Solidwork
the model componen was ..,
.sv//H=’p/V~.7 m p./Vducc 3..TO D70dC/ofi’Oe max.I7/a. 3D model of
teeth was obtained from drawing the teeth according to the ideal length and width of every tooth. The components of every expander appliance were also drawn according to manufacture description.
Assembling of different components with each other ”bone and teeth, bone and screws, teeth and bands and screws and cups” were carried out to collect all parts of each model. The material properties for spongy bone, titanium alloy, stainless steel alloy, teeth and ligaments were identified.
Load was applied to the tips of stainless steel rods in the two models. The model was restrained at the back and superior border to avoid total body displacement. The models were meshed with a curved based solid mesh and the analysis conducted with the iteration method.
The stresses at orbital floor, nasal floor, nasal septum, infraorbital foramen, zygomatic bone and around the supported teeth
were calculated. The results were collected and a correlation ana)’ test was performed.
The results have shown that, stresses produced frr osseo-integrated screws supported rapid maxillary ex£ markedly higher than stresses produced from teeth s’·
”
maxillary expander and may hazard vital structures ?
operation.
~ed rapid , the area of