Maxillomandibul ar Fixation The Jaw Dropping Experience of a Lifetime Our Team From left to right Emily Maslonkowski BSAC Ashley Phillips Co Team Leader Nina Lewis Co Team Leader Sara Karle BWIG Joe Ferris Communications Client Jeremy Plastic Warner MD Surgery UW Medical School Advisor William Murphy Assistant Professor Department of Biomedical Engineering Outline Background Information Problem Statement Motivation Our Client s Requirements Designs for Project Decision Matrix Goals for Project Questions Background Information Mandible is the second most fractured bone of the face Common causes of fractured mandibles 1 2 3 4 Assault Motor vehicle accidents Falls Sporting accidents 3 steps in fixing a mandible realign bones fixation and rehabilitation Problem Statement Design Fixate a device which will the top of the mouth to the jaw Be easier and faster to apply Maintain an adequate cost of application Be safe for the 4 6 weeks of healing Motivation for Project Surgeons throughout history have dealt with broken mandibles in many ways Maxillomandibular fixation is outdated requires wiring the mouth shut with the use of arch bars and wires Must be a better way Our Client s Requirements Cost effective Light weight Dynamic Emergency release No forces on front teeth Time Effective Safe Design 1 External Stabilization Place support on head Tighten straps securely Design 1 Materials and Costs Jaw brace Estimated Price 70 Design 1 Evaluation Pros Cons Easy Aesthetics application Cost effective Quick release No anesthesia Discomfort Small chance of sliding off Design 2 Screws and Magnets Figure 3 Magnets attached to screws Drill screws into jaw Figure 2 Figure 1 Use magnetic force to hold jaw together Design 2 Materials and Costs 4 Titanium Cortical Screws 4 AlNiCo Magnets Centre Drive Hexagonal Screwdriver onetime cost Estimated Cost 103 36 110 56 per application Design 2 Evaluation Pros Cons Re usable No materials screws Quick Application Durable emergency release Not aesthetically pleasing Requires anesthesia Design 3 Braces Figure 1 Apply Figure 2 brackets Connect lateral brackets with elastic Connect vertical brackets with rubber bands Design 3 Materials and Costs 16 stainless steel brackets 16 elastics power chain adhesive 8 rubber bands Estimated Cost 400 per application Design 3 Evaluation Pros Quick release Short application time approx 15 20 minutes No anesthesia necessary Aesthetically pleasing Cons Expensive Decision Matrix Design 1 External Design 2 Design 3 Screws Magne Braces ts Application Time 5 4 4 Cost 5 3 2 Quick Release 5 1 5 Aesthetics 1 2 5 Comfort 1 2 4 Durability 2 4 4 Local Anesthesia 5 1 5 24 17 29 Total Scale 1 5 1 poor 5 good Goals for the Rest of the Semester Find muscle forces in jaw Test design on model skull Find exact price of braces design References Goldman Kim E Mandible Fractures Ask An Oral Maxillofacial Surgeon 2005 8 Sept 2005 http www calweb com goldman mandible fractures html Muscles of Mastication Form dictates function Function follows form Nociceptive Trigeminal Inhibition Tension Suppression System 15 Sept 2005 http www nti tss com slide1 htm Peltier Jacques comp Mandible Fractures 26 May 2004 UTMB Dept of Otolaryngology 11 Sept 2005 http www utmb edu otoref Grnds Mandible fx 040526 Mandiblefx 040526 htm Prater Michael E comp Mandibular Fractures 27 Nov 1996 UTMB Dept of Otolaryngology 20 Sept 2005 http www utmb edu otoref Grnds Mandibular fx961127 Mandibular fx 961127 htm Stierman Karen and Byron J Bailey Mandible Fractures 14 June 2000 10 Sept 2005 http www utmb edu otoref Grnds Mandible fx0006 Mandible fx 0006 pdf ANY QUESTIONS
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