[Experimental and clinical study of the stability of an osteosynthesis plate for the atrophic mandible].
BACKGROUND
The high rate of complications led us to develop a new osteosynthesis plate for the treatment of the fractured atrophied mandible. The development of the new so-called pencil-bone plate is based on the 2.0 mini-plate system manufactured by the Medartis Company.


METHODS
Finite elements (FE) analysis of the new plate as well as flexibility experiments were undertaken, and 14 patients with 16 fractures of the atrophied mandible were treated with the pencil-bone plate between October 2000 and November 2001.


RESULTS
The results clearly show that the pencil-bone plate reacted in both the FE model and the static flexibility experiment in a more stable way than a standard 2.0 plate. In 13 patients, healing proceeded without serious complications; all of the patients showed subjective, nearly unchanged chewing, speaking, and swallowing abilities and no complications occurred when wearing dentures. One patient underwent surgical intervention after a new trauma.


CONCLUSIONS
The clinical outcome of the treated fractures confirmed the experimental results, which proved the high stability of the plate in the area of the fracture site. Due to the mini-plate format the intraoral application of the plate is possible without problems. The intraoral access allows rapid operation followed by a minimum of morbidity. A great advantage of the small dimension system is the unrestricted wearing of dentures after the application.
Blume
O
O
Abteilung für Mund- Kiefer- und Gesichtschirurgie, St.-Lukas-Klinik, Solingen.
Seper
L
L
Meyer
U
U
Piffkó
J
J
Joos
U
U
D000368:Aged; D000369:Aged, 80 and over; D001284:Atrophy; D001696:Biomechanical Phenomena; D001860:Bone Plates; D004867:Equipment Design; D020342:Finite Element Analysis; D005500:Follow-Up Studies; D005593:Fracture Fixation, Internal / Q000295:instrumentation*; D017102:Fracture Healing / Q000502:physiology; D006801:Humans; D008334:Mandible / Q000473:pathology* / Q000601:surgery; D008337:Mandibular Fractures / Q000601:surgery*; D008422:Materials Testing; D008875:Middle Aged; D009066:Mouth, Edentulous / Q000601:surgery*