Magnetic resonance imaging evaluation of articular disk position after orthognathic surgery with or without concomitant disk repositioning: a retrospective study.

OBJECTIVE: The aim of this study was to compare the outcomes of 2 surgical treatment options: one for correction of class II malocclusion skeletal deformity and one for pre-existing temporomandibular joint (TMJ) disorders requiring orthognathic surgery (OS) for correction of dentofacial deformity. STUDY DESIGN: This retrospective study evaluated patients who underwent OS with maxillomandibular advancement (MMA) with or without concomitant TMJ surgery for articular disk repositioning (ADR). Patients were divided into 2 groups: group I (MMA) was treated with OS only (18 patients); and group II (MMA-ADR) was treated with OS and concomitant ADR (19 patients). The sample consisted of 74 TMJs (mean patient age 29.86 years). RESULTS: In group I, 38.5% of the disks that were originally in normal position became displaced after OS, and 33.3% of displaced disks with reduction became nonreducing after OS. In group II, 78.9% of disks exhibited normal position in the final evaluation, and 97.3% of patients showed improved disk position after surgery. There was significant symptom improvement in all patients in group II, but no significant improvement in group I. CONCLUSIONS: OS with ADR appears to produce stable and beneficial results in improving symptoms in patients with displaced disk and TMJ pain.

Cirurgia de terceiro molar sob sedação com óxido nitroso: avaliação subjetiva e cardiovascular / Nitrous oxide sedation in oral surgery: subject perception and cardiovascular monitoring

Este estudo teve por objetivo avaliar o grau de aceitação, a ansiedade e a variação de frequência cardíaca (FC), saturação de oxigênio (SpO) e pressão arterial sistólica (PAS) e diastólica (PAD) em cirurgias de terceiros molares com e sem sedação consciente com óxido nitroso e oxigênio (N2O/ 02). Vinte voluntários saudáveis com necessidade de extração dos terceiros molares bilaterais participaram do estudo, o qual foi realizado em três fases: Fase A - N2O/ 02 sem intervenção odontológica; Fases B e C - exodontia de um dos lados, de forma aleatória, com (C-N2O) ou sem (S-N2O) sedação associada. Para definir o grau de ansiedade utilizou-se a Escala de Ansiedade Dental de Corah (EADC); a sensação dolorosa foi quantificada pela Escala de 11 pontos em caixa (EC); e o grau de aceitação da sedação pelo questionário subjetivo (QS). 60% dos voluntários deram nota máxima para C-N2O e todos os voluntários afirmaram que a sessão C-N2O foi mais agradável. O relato de dor após a sessão C-N2O foi menor ou igual à da sessão S-N2O para 85% dos voluntários. A FC apresentou diferença significante entre as fases C-N2O e S-N2O, diferentemente da Sp02, PAD e PAS. Concluiu-se que os voluntários mostraram-se moderadamente ansiosos em todas as fases, sendo a sessão C-N2O mais agradável que S-N20, a C-N20 reduziu significativamente a FC, mas não influenciou na PAS, PAD e Sp02. A C-N20 não alterou a sintomatologia dolorosa durante e após a cirurgia.

The purpose of this study was to evaluate the changes of heart rate (HR), oxygen saturation (SpO) and both diastolic (DBP) and systolic (SBP) blood pressure, anxiety and acceptance of nitrous oxide conscious sedation (N2O/ 0) in three phases: A - N2O/02 without surgery; B and C - extraction of one of the sides with (C-N2O) or without (S-N2O) nitrous oxide sedation, in a random cross-over manner. Twenty healthy volunteers, average age of 20.55 years, undergoing removal of third molars were selected. Corah's Dental Anxiety Scale (CDS); Eleven points in box Scale (EC) and subject questionnaire (QS) was used to evaluation. The comparative values between phases were analyzed by Wilcoxon's and Friedman's test (= 0,05) and by explorative analysis (QS). The volunteers moderately revealed anxious in all the phases and 60% of volunteers had given maximum note for C-N2O. All volunteers had affirmed that C-N2O was more pleasant. The pain report after the C-N2O was lesser or equal for 85% of volunteers. The HR presented significant difference between phases C-N2O and S-N2O (p= 0.020). There were no significant statistical differences between phases to SpO2 (p= 0.153), DBP (p= 0.730) and SBP (p= 0.975). These results suggest that C-N2O was most pleasant and reduced the HR significantly, but it did not influence in the SBP, DBP and Sp02, nor modified the pain during or after surgery.