1. Maxillomandibular Fixation “The Jaw-Dropping Experience of a Lifetime”

2. 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)

3. Client Jeremy Warner, MD  Plastic Surgery, UW Medical School

4. Advisor William Murphy  Assistant Professor, Department of Biomedical Engineering

5. Outline Background Information Problem Statement Motivation Our Client’s Requirements Designs for Project Decision Matrix Goals for Project Questions

6. Background Information Mandible is the second most fractured bone of the face Common causes of fractured mandibles 1.Assault 2.Motor vehicle accidents 3.Falls 4.Sporting accidents 3 steps in fixing a mandible: realign bones, fixation, and rehabilitation

7. Problem Statement Design a device which will:  Fixate 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

8. 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for Project Surgeons throughout history have dealt with broken mandibles in many ways Maxillomandibular fixation is outdated  requires wiring the mouth shut with the use of arch bars and wires Must be a better way!

9. Our Client’s Requirements Cost effective Light weight Dynamic Emergency release No forces on front teeth Time Effective Safe

10. Design #1: External Stabilization Place support on head Tighten straps securely

11. Design #1: Materials and Costs Jaw brace Estimated Price…$70

12. Design #1: Evaluation Pros Easy application Cost effective Quick release No anesthesia Cons Aesthetics Discomfort Small chance of sliding off

13. Design # 2: Screws and Magnets Figure 1 Figure 2 Figure 3  Magnets attached to screws  Drill screws into jaw  Use magnetic force to hold jaw together

14. Design #2: Materials and Costs 4 Titanium Cortical Screws 4 AlNiCo Magnets Centre Drive Hexagonal Screwdriver (one-time cost) Estimated Cost...$103.36-$110.56 per application

15. Design #2: Evaluation Pros Re-usable materials (screws) Quick Application Durable Cons No emergency release Not aesthetically pleasing Requires anesthesia

16. Design #3: Braces Apply brackets Connect lateral brackets with elastic Connect vertical brackets with rubber bands Figure 2 Figure 1

17. Design #3: Materials and Costs 16 (stainless steel) brackets 16 elastics (power chain) adhesive 8 rubber bands Estimated Cost…$400 per application

18. Design #3: Evaluation Pros Quick release Short application time (approx. 15- 20 minutes) No anesthesia necessary Aesthetically pleasing Cons Expensive

19. Design 1: ExternalDesign 2: Screws/Magnets Design 3: Braces Application Time 544 Cost532 Quick Release515 Aesthetics125 Comfort124 Durability244 Local Anesthesia 515 Total241729 Scale: 1-5, 1=poor, 5=good Decision Matrix

20. Goals for the Rest of the Semester Find muscle forces in jaw Test design on model skull Find exact price of braces design

21. References Goldman, Kim E. "Mandible Fractures." Ask An Oral & Maxillofacial Surgeon. 2005. 8 Sept. 2005. "Muscles of Mastication: Form dictates function; Function follows form." Nociceptive Trigeminal Inhibition - Tension Suppression System. 15 Sept. 2005. Peltier, Jacques, comp. Mandible Fractures. 26 May 2004. UTMB Dept. of Otolaryngology. 11 Sept. 2005. Prater, Michael E., comp. Mandibular Fractures. 27 Nov. 1996. UTMB Dept. of Otolaryngology. 20 Sept. 2005. Stierman, Karen, and Byron J. Bailey. "Mandible Fractures." 14 June 2000. 10 Sept. 2005.

22. ANY QUESTIONS?