title: Strength analysis of titanium and resorbable internal fixation in a mandibulotomy model.
abstract: OBJECTIVE
  Mandibulotomy is used to access various tumors of the tongue base, posterior oral cavity, pharynx, parapharyngeal space, and cranial base. Internal fixation using titanium plates and screws is the most common method of stabilization. These have the potential for interference with radiotherapy delivery. This in vitro study compares the strength of titanium and resorbable internal fixation in a mandibulotomy model by analyzing the force required for plate and screw breakage.
  
  
  METHODS
  Red oak wood board was used to simulate the mandible. Titanium and resorbable plates and screws in various configurations were used to stabilize pieces of the wood. They were arranged in 6 different groups. The specimens were individually tested with a vertical load, while the test machine recorded the force-versus-displacement behavior automatically.
  
  
  RESULTS
  Plate type and configuration affected the applied load required to induce displacement of the simulated mandibulotomy. Heating and cooling the resorbable plates prior to strength testing also affected the load-versus-displacement curve.
  
  
  CONCLUSIONS
  Overall, the titanium system we studied exhibited greater resistance to deformation from a vertical load than did the resorbable plate groups.
authors.affiliation: University of Maryland Dental School, Baltimore, MD, USA.
authors.forename: Pat
authors.initials: P
authors.lastname: Ricalde
authors.forename: Stephen L
authors.initials: SL
authors.lastname: Engroff
authors.forename: J Anthony
authors.initials: JA
authors.lastname: Von Fraunhofer
authors.forename: Jeffrey C
authors.initials: JC
authors.lastname: Posnick
mesh_terms: D020341:Absorbable Implants; D001672:Biocompatible Materials / Q000737:chemistry*; D001860:Bone Plates; D001863:Bone Screws; D003080:Cold Temperature; D006358:Hot Temperature; D006801:Humans; D016268:Internal Fixators; D019344:Lactic Acid / Q000737:chemistry*; D008334:Mandible / Q000601:surgery*; D008422:Materials Testing; D008953:Models, Anatomic; D011100:Polyglycolic Acid / Q000737:chemistry*; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011108:Polymers / Q000737:chemistry*; D011474:Prosthesis Design; D011475:Prosthesis Failure; D013314:Stress, Mechanical; D014025:Titanium / Q000737:chemistry*
chemical_list: D001672:Biocompatible Materials; D011108:Polymers; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; D014025:Titanium