Finite Element Modeling for Development and Optimization of a Bone Plate for Mandibular Fracture in Dogs Flashcards
What type of plate was being tested in the study?
Osteosynthesis with a pure titanium plate of double-arch geometry and blocked monocortical screws of free angula- tion
What was found as the screw numbers diminished?
The deflection increased and the relative stiffness decreased proportionally to the diminishing screw number.
What percentage of fractures are mandibular fractures
3 to 6 % of all the fractures
what 3 biomechanics factors should be considered when choosing a device for repair?
The masticatory muscles, the direction of the fracture line, and the forces involved on the repair of the fracture.
On what surface of the mandibular fracture should a plate be placed?
On the tension surface.
What mechanical properties of the nylon block were tested in the tension tests?
The elasticity modulus and maximum tension of each block was tested.
What were the six groups that were tested using the plate?
group 1 with 3 rostral and 3 distal screws
group 2 with 2 rostral and 3 distal screws
group 3 with 2rostral and 2 distal screws
each with favourable( oblique ventrorostral) and unfavourable fractures(oblique ventrocaudal)
To what tooth was the cantilever force applied to test the plates
The mandibular first molar
What were the standards for the bending test?
The point off plastic deformation (irreversible ) for both favourable and unfavourable fractures and the maximum elastic deformation( reversible) of unfavourable fractures
What was the maximum load applied?
40N at a distance of 35mm from the fixation point
Was there a difference in the structural resistance of the different groups in the favourable fractures?
No
Was there a difference in the structural resistance of the different groups in the unfavourable fractures?
Yes statistically significant between G1 & G3 and between G2 & G3
Which screw showed the most stress in the plate in the favourable fractures in the G3 group.
Generally the ventral screw in the rostral section.
how was the Von Mises stress different for the G3 group ion favourable and unfavourable fractures?
Favourable was evenly distributed and in unfavourable was focus on ventral screw in caudal segment
What was titanium used I to manufacture the plates in this study?
less CT artefact and titanium and titanium aluminium alloy have the lowest elastic modulus of the biocompatible metals.
