Avaliação cefalométrica do espaço aéreo posterior em pacientes com oclusão Classe II submetidos à cirurgia ortognática / Cephalometric evaluation of posterior air space in occlusion Class II patients treated with orthognatic surgery

OBJETIVO: o avanço maxilomandibular é um método cirúrgico comumente usado no tratamento de pacientes acometidos pela Síndrome da Apnéia Obstrutiva do Sono (SAOS) e portadores de anormalidades anatômicas identificáveis neste complexo, que estreitam e/ou obstruem o espaço aéreo. O intuito deste estudo foi analisar variações cefalométricas do espaço aéreo faríngeo em indivíduos Classe II de Angle, após a cirurgia ortognática. METODOLOGIA: a amostra consistiu de telerradiografias laterais equivalentes aos períodos pré e pós-operatório de 30 indivíduos, divididos no grupo com avanço cirúrgico mandibular (n=15) e no grupo com avanço maxilomandibular (n=15). Os parâmetros cefalométricos usados permitiram avaliar o espaço aéreo posterior em 3 níveis: a hipofaringe (PFI-V), a orofaringe (PFM-PM, PFM-PO, PFM-U, PFM-Up) e a nasofaringe (PFM-PN, pm-PFS). A análise esquelética foi na base do crânio (N-S-Ba) e na mandíbula (Ar-Go-Me). A média das diferenças entre os valores pré e pós-operatórios das mensurações lineares (mm) e angulares (graus) foi avaliada pelo teste t pareado. RESULTADOS E CONCLUSÕES: estatisticamente, não houve redução do espaço aéreo faríngeo pós-avanço cirúrgico. O que se observou foi que apenas PFM-PO e PFS-pM se mantiveram constantes e na maioria restante os valores aumentaram.

AIM: Maxillomandibular advancement is a surgical treatment for patients suffering from obstructive sleep apnea syndrome (OSAS) and those with identificable anatomic abnormalities in this complex that narrows and/or obstructs the airway. The purpose of this study is to evaluate pharyngeal airway space cephalometric variations in patients affected by Class II, treated with orthognatic surgery. METHODS: The sample consisted of pre and postoperative (minimum 6 months) lateral radiographs of 30 patients, that had undergone mandibular (n=15) and maxillomandibular (n=15) advancement. The cephalometric parameters used allowed to evaluate the posterior airway space at three levels: the hypopharynx (V-LPW), the oropharynx (PAS-MP, PAS-OP, PAS-U and PAS-Up) and the nasopharynx (PAS-NP, pm-UPW). The skeletal analyse was in cranial base (N-S-Ba) and in mandible (Ar-Go-Me). The mean difference between the pre and postoperative linear (mm) and angular (degree) measurements was evaluated by paired t test. RESULTS AND CONCLUSIONS: Statistically, there was no pharynx airway space reduction after surgery advancement. It was noted that only PAS-OP and pm-UPW remained constant and the values increased, for the most remaining part.

Nasal cavity volume and nasopharyngeal cavity volume in adults measured by acoustic rhinometry / 临床耳鼻咽喉头颈外科杂志

Objective:To investigate the range of normal value of total nasal cavity volume(NV)and total na-sopharyngeal cavity volume (NPV)of healthy adults. Method: Six hundred and fifty-nine healthy adults andeighty-two adults of chronic rhinitis were measured with acoustic rhinometry. Result:The range of NV was29. 922～37. 481 cm3 and NPV was 29. 369～44. 159 cm3. Comparing healthy adults with adults of chronic rhini-tis,there was a significant difference in NV. Conclusion:Acoustic rhinometry suited for objective assessment ofthe nasal airways in adults. It was demonstrated that these data could provide available information for the studyof nasal physiology and pathophysiology,as well as for the diagnosis and judgement of therapeutic effectiveness ofnasal diseases.