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Maxillomandibular 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 Warner, MD - PowerPoint PPT Presentation
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Maxillomandibular Fixation
“The Jaw-Dropping Experience of a Lifetime”
Our TeamFrom left to right… Emily Maslonkowski (BSAC) Ashley Phillips (Co-Team Leader) Nina Lewis (Co-Team Leader) Sara Karle (BWIG) Joe Ferris (Communications)
ClientJeremy Warner, MD
Plastic Surgery, UW Medical School
AdvisorWilliam Murphy
Assistant Professor, Department of Biomedical Engineering
OutlineBackground InformationProblem StatementMotivationOur Client’s RequirementsDesigns for ProjectDecision MatrixGoals for ProjectQuestions
Background Information Mandible is the second most
fractured bone of the face Common causes of fractured
mandibles1. Assault2. Motor vehicle accidents3. Falls4. Sporting accidents
3 steps in fixing a mandible: realign bones, fixation, and rehabilitation
Problem StatementDesign 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
Motivation for ProjectSurgeons 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Maxillomandibular fixation is outdated requires wiring the mouth shut with the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 wiresMust be a better way!
Our Client’s RequirementsCost effectiveLight weightDynamicEmergency
release
No forces on front teeth
Time EffectiveSafe
Design #1: External Stabilization
Place support on head
Tighten straps securely
Design #1: Materials and CostsJaw brace
Estimated Price…$70
Design #1: Evaluation
ProsEasy
applicationCost effectiveQuick releaseNo anesthesia
ConsAestheticsDiscomfortSmall chance
of sliding off
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
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
Design #2: Evaluation
Pros Re-usable
materials (screws)
Quick Application
Durable
Cons No emergency
release Not aesthetically
pleasing Requires
anesthesia
Design #3: Braces
• Apply brackets• Connect lateralbrackets with elastic• Connect vertical bracketswith rubber bands
Figure 2
Figure 1
Design #3: Materials and Costs16 (stainless steel) brackets16 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
ConsExpensive
Design 1: External
Design 2: Screws/Magnets
Design 3: Braces
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
Total 24 17 29
Scale: 1-5, 1=poor, 5=good
Decision Matrix
Goals for the Rest of the SemesterFind muscle forces in jawTest design on model skullFind 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/Mandible-fx- 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-fx-961127/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-fx-0006/Mandible-fx-0006.pdf>.
ANY QUESTIONS?