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EQ sinusotomy

Vet Dentistry

QuestionAnswer
What two different sinusotomy flap approaches can be used? 1. maxillary 2. frontonasal
Which sinusotomy approach is the most versatile? why? frontonasal: provides access to all compartments of ipsilateral paranasal sinuses
Which compartment is not possible to access through a maxillary flap? ventral chonchal (in horses <6 yrs old)
Where does the caudal extent of the incision for a frontonasal sinusotomy flap start? dorsal midline midway between the supraorbital foramina and the medial canthi of the eyes
to what extent does the caudal aspect of the incision for a frontonasal sinusotomy flap extend laterally? to a point 1.5-2 cm medial to the most medial aspect of the rim of the orbit
Where does the rostral extent of the incision for a frontonasal sinusotomy flap start? on dorsal midline 1-2 cm daudal to the plane where the nasal bones begin to diverge
to what extent does the rostral aspect of the incision for a frontonasal sinusotomy flap extend laterally? to an imaginary line extending from the medial canthus of the eye to the nasoincisive notch
What structure must be avoided when connecting the rostral and caudal incisions for the frontonasal sinusotomy flap? nasolacrimal duct
What is the course of the nasolacrimal duct? from the medial canthus of the eye, through a point midway between the infraorbital foramen and the nasoincisive notch
What landmarks are used to create a portal into the maxillary sinus for lavage? 2 cm ventral and 2 cm rostral to medial canthus
What landmarks/imaginary lines are used for a conchofrontal approach to the paranasal sinuses with a 2" diameter trephine? trephination site is 5 cm axial to line betweem madial canthus and nasoincisive notch 2 cm rostral to a line between the medial canthi 4 cm lateral to the dorsal midline
What external anatomic landmarks bound the caudal border of the maxillary sinus? middle of the eye to the facial crest
What external anatomic landmarks bound the ventral border of the maxillary sinus? along and just dorsal to the facial crest
What external anatomic landmarks bound the rostral border of the maxillary sinus? line from infraorbital foramen to rostral border of the facial crest
What external anatomic landmarks bound the dorsal border of the maxillary sinus? line from the medial canthus to the infraorbital foramen
Where does the skin incision start for maxillary osteoplastic flap to access the 08-10 teeth? 1 cm rostral to and slightly ventral to the medial canthus extends ventrally to 1 cm dorsal to facial crest turns dorsally 1 cm caudal to the rostral extent of the facial crest extends to a point 1 cm daudal to the infraorbital foramen
What muscles may be transected by the incision for a maxillary osteoplastic flap? nasolabialis levator labii superioris
What vascular structures are often transected by the incision for a maxillary osteoplastic flap? angularis oculi aretery and vein
Along what border of the maxillary osteoplastic flap is there most risk for injury to the infraorbital canal during bone cutting? dorsal, rostral end of bone flap
What is the most common origin of inspissated exudate in the ventral conchal sinus? primary bacterial sinusitis, not often associated with dental infection
Where is the hole created to allow lavage of the caudal maxillary sinus after a maxillary osteoplastic flap has been created? caudal to the flap, 1.5 cm ventral to the most ventral aspect of the orbit
Which soft tissues are apposed w/sutures following the creation of a sinusotomy flap? subQ and skin
Created by: lamarron
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