67.Maxilla_Mandible FRACTURES Flashcards Preview

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Flashcards in 67.Maxilla_Mandible FRACTURES Deck (13):

what is the major anatomical difference between the mandible and other long bones

the mandible does not have a medullary cavity (thus no hematopoetic cells)Mandible has a mandibular canal with inferior alveolar neurovascular structures


Tension and compression surfaces of the mandible

tension--alveolar margincompression--ventral mandibular border*important for implant placement! for neutralization, place near alveolar bone margin


main or primary force acting on the mandible

bendingmore rostrally, rotationalat the ramus, shearing


3 maxillofacial buttresses

rostral (medial)--nasomaxillary*lateral--zygomaticomaxillarycaudal--pterygomaxillary**Lateral is most importantrarely fix caudal buttressincisive bones are NOT part of the buttress and thus rarely need to be fixed


Define minor and major tooth root contact with screw

major > or = 50 % screw diameter penetrating tooth rootminor < 50% screw diameter penetrating tooth root


Miller et al 2011 Veterinary Surgery article compared pullout of SOP and LCDCP

SOP (plate screw construct) had a higher perpendicular load to failure than a LC-DCP screw construct


Baram et al 2008 Veterinary Surgery article concluded CT was superior than radiographs when evaluating traumatic maxillofacial/mandibular trauma EXCEPT FOR

occlusion/malocclusionmandibular body fractures


dental formula DOG

maxilla 3142mandible 314342 total


dental formula cat

maxilla 3131mandible 312128 total


mandibular fixation techniques

--Oral splints--Interfragmentary/intraosseous wires (with 2nd stabilization wire ventral)--Plates (miniplates, SOP, Recon, LCDCP, DCP) with 2nd stabilization plate--ESF (mandible NOT maxillary fractures)


Thread pitch necessary for adequate bone purchase

adequate bone purchase requires to be AT LEAST = to bone thickness for neutralization (adequate for mini plate application of maxilla)AT LEAST 2x bone thickness for compression


T/F increased frequency of complications with fracture healing has been observed when teeth are removed

TRUEremoval of teeth is not advised


sequence of repair in patient with multiple mandibular and maxillary fractures

usually mandible firststart caudal to rostralstabilize mandibular symphysis lastalign occlusion relative to mandible to fix maxilla (lateral buttress first)

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