RESUMO
In this study, 53 patients who underwent a bilateral sagittal split ramus osteotomy to advance the mandible were examined radiographically to assess condylar position presurgically, postsurgically, and posttreatment. Subjects were separated into two groups, 29 patients who received wire fixation and 24 who received rigid internal fixation. Condylar position changes were measured on tracings of submentovertex and transcranial radiographs at the time periods mentioned. Differences in condylar position were evaluated in two defined time intervals--T1, presurgical to postsurgical, and T2, postsurgical to posttreatment. Right and left sides were evaluated independently. No correlation between amount of advancement and condylar position change was identified within or between the fixation groups at T1 and T2. No correlation between change in mandibular plane angle and change in condylar position was identified within or between the groups at T1 and T2. Statistically significant differences were identified between the fixation groups in the degree of condylar change measured on the tracings of both submentovertex and transcranial radiographs both right and left sides, at time T1. There was also a significant difference in the change in mandibular plane angle at T1 between the fixation groups. It appears from this study that use of rigid internal fixation following bilateral sagittal split ramus osteotomy results in a statistically significantly greater condylar displacement than does wire fixation. Further research is required to determine whether these changes in condylar position are clinically significant.
Assuntos
Fixadores Internos , Mandíbula/cirurgia , Côndilo Mandibular/fisiopatologia , Osteotomia/métodos , Retrognatismo/cirurgia , Adulto , Parafusos Ósseos , Fios Ortopédicos , Humanos , Côndilo Mandibular/cirurgia , Período Pós-Operatório , Análise de Regressão , Estudos Retrospectivos , Resultado do TratamentoRESUMO
Full-arch reversible hydrocolloid impressions of a dentoform arch (Columbia) containing an extracted first premolar prepared for a distal-occlusal inlay were immersed for 30 minutes in selected disinfectant solutions. The impressions were poured with die stone, and three cast inlays were fabricated on each die. The results of this procedure indicate that a 30-minute immersion of reversible hydrocolloid impressions in diluted solutions of iodophor, commercial hypochlorite, or 2% acidic glutaraldehyde does not adversely affect the dimensional stability of these impressions.
