RESUMEN
We compared the biomechanical stability of 60 degrees and 90 degrees angles for insertion of screws for fixation of sagittal split ramus osteotomies (SSROs) in 10 sheep mandibles in vitro. After 5 mm advancements, the osteotomies were fixed with screws 2 mm in diameter inserted with a torque control screwdriver at either 60 degrees or 90 degrees to the long axis of bone, in a matched pair experimental design. All specimens were then loaded in a physiological manner and the load-displacement of the osteotomies was recorded. Data for resistance to movement were compared by a paired t -test. The mean (SD) resistance to movement for the 60 degrees and 90 degrees screw insertions was 63.4 (27.7) N/mm and 59 (22.3) N/mm respectively. There was no significant difference between the groups. This correlates with clinical findings.
Asunto(s)
Tornillos Óseos , Técnicas de Fijación de Maxilares/instrumentación , Mandíbula/cirugía , Osteotomía/instrumentación , Animales , Fenómenos Biomecánicos , Análisis del Estrés Dental , Osteotomía/métodos , OvinosRESUMEN
Dentistry has played an important role in the treatment of facial injuries. New imaging methods, expanded surgical approaches and improved biomaterials have brought about significant improvements in the outcomes. Excellent cosmetic and functional results have been made possible through early definitive intervention.
Asunto(s)
Fijación Interna de Fracturas/métodos , Fracturas Maxilomandibulares/cirugía , Traumatismos Maxilofaciales/cirugía , Fracturas Craneales/cirugía , Hueso Etmoides/lesiones , Hueso Frontal/lesiones , Humanos , Hueso Nasal/lesiones , Traumatismos de los Tejidos Blandos/terapia , Fracturas de los Dientes/terapia , Fracturas Cigomáticas/cirugíaRESUMEN
The effect of screw size and insertion technique on the stability of sagittal split osteotomies was evaluated on 10 cadaver mandibles. The mandibles were osteotomized, and stabilized with either 2.0- or 2.7-mm stainless steel screws inserted as lag screws or position screws. All specimens were tested on an MTS servohydraulic testing machine (MTS Systems, Inc, Minneapolis, MN) to determine the strength and stability of the fixation. There were no statistically significant differences between the strengths achieved with the different screw sizes or fixation techniques. The primary variable that determined stability seemed to be the quality of the underlying bone.
Asunto(s)
Tornillos Óseos , Mandíbula/cirugía , Osteotomía/instrumentación , Adulto , Análisis de Varianza , Fuerza de la Mordida , Análisis del Estrés Dental , Diseño de Equipo , Humanos , Mandíbula/patología , Persona de Mediana Edad , Rotación , Resistencia a la Tracción , Insuficiencia del TratamientoRESUMEN
This report of case discusses a bilateral giant cell granulomata of the mandible without the superimposed systemic finding of hyperparathyroidism. This is believed to be the first such report found in the English dental literature.
Asunto(s)
Granuloma de Células Gigantes/patología , Enfermedades Mandibulares/patología , Adulto , Femenino , Granuloma de Células Gigantes/complicaciones , Humanos , Hiperparatiroidismo/complicaciones , Enfermedades Mandibulares/complicacionesRESUMEN
The use of rigid internal fixation has become an acceptable method for the treatment of fractures and continuity defects of the mandible. This technique has a wide variety of applications, including stabilization of mandibular segments for the application of bone grafts. The primary advantage of rigid fixation is that it obviates the need for maxillomandibular fixation associated with the treatment of mandibular trauma by traditional methods. This article reviews twenty cases in which rigid internal fixation was used for the treatment of fractures and continuity defects of the mandible. In only one case was early removal of the implant necessary as a result of infection.