RESUMO
OBJECTIVE: The purpose of this study was to examine both condylar displacement of the temporomandibular joint after sagittal split ramus osteotomy with rigid osteosynthesis and intraoral vertical ramus osteotomy without osteosynthesis in patients with mandibular prognathism by means of three-dimensional computed tomography. STUDY DESIGN: In this pilot study, five patients treated with sagittal split ramus osteotomy and 5 patients treated with intraoral vertical ramus osteotomy were evaluated. A technique to superimpose a postoperative three-dimensional computed tomography image on its corresponding preoperative image was designed. Postoperative condylar displacement, rotation, and tilting were measured in three-dimensional computed tomography images. RESULTS: Within 3 to 6 months after surgery, changes in the inclination of the condylar axes were distinctly seen, although changes in the position of the condyles within the joints were minimal. In particular, outward rotation of the condylar long axes after intraoral vertical ramus osteotomy was a frequent finding. CONCLUSIONS: The three-dimensional computed tomography superimposition technique was a practical method of evaluating postsurgical condylar displacement after mandibular osteotomy.
Assuntos
Mandíbula/cirurgia , Côndilo Mandibular/diagnóstico por imagem , Osteotomia/métodos , Tomografia Computadorizada por Raios X/métodos , Adolescente , Adulto , Placas Ósseas , Estudos de Avaliação como Assunto , Feminino , Seguimentos , Humanos , Processamento de Imagem Assistida por Computador/métodos , Masculino , Mandíbula/diagnóstico por imagem , Côndilo Mandibular/cirurgia , Movimento , Ortodontia Corretiva , Projetos Piloto , Prognatismo/cirurgia , Rotação , Articulação Temporomandibular/diagnóstico por imagemRESUMO
The cytotoxic effects of an oxide-anodized titanium alloy were investigated by cell and organic culture studies. Toxicity was estimated based on cell survival and growth rates compared with those of control materials (glass) after cultivation of cells (L 929) and chicken embryonic femurs expose to alloy plates. The oxide-anodized titanium alloy showed no cytotoxicity with respect to survival or growth rates in either cells or chicken embryonic femurs. Furthermore, the oxide-anodized titanium alloy was more acid and alkali resistant than intact titanium alloys. The results suggest that oxide-anodized titanium has greater stability and its metallic ions may be leachedless under various conditions following dental implantations. Therefore, this alloy should be suitable for use as a dental implant material.