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Oral Fx repair
Vet Dentistry
| Question | Answer |
|---|---|
| Which type of jaw fracture tooth involvement most frequently contributes to tooth morbidity | When the fracture line follows the root surface from the gingival margin to the apical region, affecting both the periodontal and endodontic integrity |
| At what time frame should a re-implanted avulsed tooth receive endodontic therapy? | 2 weeks |
| What liquid should be used for storage of an avulsed tooth pending reimplantation? | cool milk |
| What is the most common location of rostral mandibular fracture in cats? | symphysis |
| What is a type I mandibular fracture in Region A? | mandibular symphyseal separation with no break in the mucosa |
| What is the defining characteristic of type II fracture? | soft tissue disruption |
| What classifies a mandibular fracture in region A as type III? | soft tissue disruption combined with comminution of bone fragments, often together with broken teeth |
| What are 2 different interdental wiring techniques that can be applied to stabelize a symphyseal separation? | Stout's or Essig's technique |
| Which direction does the mandible deviate in the case of a unilateral fracture? | toward the side of injury |
| According to fracture biomechanics, what is the tension side of the mandible? | dorsal alveolar border |
| What is a favorable mandibular fracture? | oriented running caudo-dorsally |
| What is an unfavorable mandibular fracture? | oriented running caudo-ventrally |
| What configuration should be used with intraosseous wires to stabelize an unfavorable mandibular fracture? | common placement site in the rostral segment and 2 sites in the distal segment to approximate a perpendicular relationship of the 2 wires (triangle configuration) |
| What is the most common location of mandibular fracture? | Mandibular body, regions B, C, & D |
| What part of the mandible is considered regions E and F? | Vertical ramus |
| What region is the TMJ part of? | Region F |
| What is salvage tx for injuries to the TMJ that degenerate and limit effective use? | condylectomy |
| What time frame do unilateral fractures dorsal to the condylar process take to heal using a tape muzzle? | 2-3 weeks |
| What time frame do fractures below the condylar process in the vertical ramus take to heal? | 4-5 weeks |
| What time frame is usually sufficient to form a stable callus after stablization of maxillary fracture? | 3 weeks |
| What guidelines are used for placing a tape muzzle/ | correct occlusion allowance of a 0.5 to 1.5 cm gap between maxillary and mandibular incisors |
| What are contraindications for a tape muzzle | Brachycephalic breeds, problems with vomiting, respiratory distress |
| What is an alternative method to tape muzzles to limit oral movement while maintaining occlusion? | interarcade wiring |
| What are 4 basic wiring techniques? | osseous interdental adjunct interarcade |
| What adjunct must be applied with osseous wiring to provide stable fixation? | immobilization of jaw as with interarcade bonding |
| What are 3 fundamental forms of osseous wiring? | circumferential transosseous (interfragmentary) transcircumferential |
| How is circumferential wiring most commonly used in jaw fracture stabelization? | for symphyseal separation |
| What gauge of stainless steel wire is typically used for interfragmentary wiring? | 20-28. Usually 24 g |
| What other instruments are utilized to place interfragmentary wires? | 14-20 gauge hypodermic needle and a No. 4 to No. 6 surgical length round bur |
| Which type of mandibular body fracture is trans-circumferential wiring most commonly used to repair? | unfavorable fx |
| Where is the anchorage hole for trans-circumferential wiring placed? | 3-4 mm from the alveolar crest over the fracture site |
| What is the most common gauge of stainless steel wire used in interdental wiring? | 26 g (24-30) |
| What are the 4 basic types of interdental wiring? | Ivy loop Stout's multiple loop Essig's technique Risdon's technique |
| What is the Ivy loop wiring technique ideal for? | to reduce simple fractures between 2 teeth and securing acrylic appliances also can be used as anchorage for other attachments |
| What is Stout's loop? | a single wire method incorporating more than 2 teeth: a continuation of the Ivy loop |
| In stout's loop technique, what is the working wire? | the lead end that is passed back and forth through the interproximal spaces and forms the tightening loops |
| In stout's loop technique, what is the static wire? | the lead that lays against the tooth and is fixed in place by the loops of the working wire lead |
| In Essig's wiring method, what is the primary wire? | the master wire that is passed around all of the teeth to be incorporated in the support (usually incisors, sometimes canines too) |
| In Essig's wiring method, what are the secondary wires? | short segments that are passed through an interproximal space, circling both the lingual and facial strands of the primary wire |
| When is Risdon's technique ideal? | when greater strength of reduction is required |
| What is the underlying contributor to most potential complications associated with circlage wire stabelization of mandibular symphyseal separation? JVD Fall 2012 | overtightening the wires. can lead to necrosis of soft tissues and/or underlying bone, malalignment of the symphysis |
| When comparing composite resin materials for maxillomandibular fixation in cats for tx of jaw fx and TMJ luxation, which material and technique is superior? Vet surg 2011 | partial coronal surface acid etch before use of flowable composite |
| Why is flowable composite used after partial surface acid etch the best material/technique for fixation of mandibular fx or tmj luxation in cats? Vet surg 2011 | maintains a strong bond yet allows easy material removal with a low complication rate |
| What configuration is considered a 'favorable' mandibular fracture? Vet Surg 2010 | running in the rostroventral direction (forces applied by digastricus m. are counteracted by forces applied by masseter m) |
| in maxillomandibular fixation, what is the ideal distance the mouth should be left open? Why? J Small Anim Pract 2011 | 10-15 mm between incisor arcades, tips of canine teeth slightly overlapped. So the cat can use the tongue to lick food and the mouth will be closed enough for him to swallow it |
| What is a common reason for fixation failure when interarcade bonding is performed? J small anim pract 2011 | breakage or bond failure of the composite between the canine teeth |
| What are the 6 categories of luxation? (in order of increasing severity) JVD Fall 2010 | concussion, subluxation, lateral luxation, extrusive luxation, intrusive luxation, avulsion |
| What are the 3 biomechanical factors that should be considered in the choice of mandibular fracture repair technique? JVD Winter 2010 | 1. masticatory muscles 2. direction of fx line 3. forces involvedon the repair of the fx |
| in general, how many screws should be used (in plate repair techniques) to best stabelize the plate and structureal rigidity of the repair? JVD Winter 2010 | more = better EXCEPT in mand. fx w/'favorable' configuration, decreasing the # of screws does not compromise stabelization (2 screws per side of fx minimum) |
| What are the 2 most common causes of mandibular fx in cats? JVD Winter 2010 | vehicular trauma and falling from height |
| What is the most common complication of oral fx repair? JVD Winter 2010 | malocclusion |
| What are 2 main goals of mandibular fx treatment? JVD Summer 2009 | restoration of normal occlusion and rapid return to function |
Created by:
lamarron
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