Bruno César Ladeira Vidigal

Impact of human maxillary sinus volume on grafts dimensional changes used in maxillary sinus augmentation: a multislice tomographic study

PURPOSE To assess the influence of complete maxillary sinus volume on the dimensional changes of different grafts used in maxillary sinus lift. MATERIALS AND METHODS Analysis of 50 surgical procedures of maxillary sinus lift performed on 43 subjects using different grafting materials: fresh frozen allogenic particulated bone (11), hydroxyapatite (Endobon(®)) (17), 60% hydroxyapatite + 40% beta-tricalcium phosphate (Bone Ceramic(®)) (12) and Bone Ceramic(®) + Emdogain(®) (10). One hundred and fifty multislice tomographic images of the maxillary sinus were obtained using the software Syngo CT 2011 A VOLUME, measuring complete maxillary sinus volume (T0) and dimensional changes of different graft materials during periods of 15 days (T1) and 180 days (T2). The factor studied was the influence of maxillary sinus volume on the dimensional changes of different graft materials used in maxillary sinus lift in patients with posterior edentulism. Data obtained were assessed using the Students t-test and Pearsons correlation coefficient. RESULTS No correlation (r 0.112) between the total maxillary sinus volume and the dimensional changes of the different graft materials used in this study was observed (P > 0.05). CONCLUSION This study demonstrated that there is no sufficient evidence to support the thesis that the volume of the maxillary sinus influences the contraction of the grafts, at least on sample or the biomaterials evaluated in this cohort study.

Are computed tomography 3D measurements of the upper airways in mouth-breathing children in agreement with the ENT clinical diagnosis of obstruction?

INTRODUCTION Imaging studies have hystorically been used to support the clinical otorhinolaryngological evaluation of the upper respiratory tract for the diagnosis of obstructive causes of oral breathing. OBJECTIVE The objective of this study was to compare 3D volumetric measurements of nasal cavity, nasopharynx and oropharynx of obstructed mouth-breathing children with measurements of non-obstructed mouth-breathing children. METHODS This retrospective study included 25 mouth-breathing children aged 5-9 years evaluated by otorhinolaryngological clinical examination, flexible nasoendoscopy and full-head multi-slice computed tomography. Tomographic volumetric measurements and dichotomic otorhinolaryngological diagnosis (obstructed vs. non-obstructed) in three anatomical regions (the nasal cavity, nasopharynx and oropharynx) were compared and correlated. An independent sample t-test was used to assess the association between the 3D measurements of the upper airways and the otorhinolaryngological diagnosis of obstruction in the three anatomical regions. Inter- and intra-observer intraclass correlation coefficients were used to evaluate the reliability of the 3D measurements. RESULTS The intra-class correlation coefficients ranged from 0.97 to 0.99. An association was found between turbinate hypertrophy and nasal cavity volume reduction (p<0.05) and between adenoid hyperplasia and nasopharynx volume reduction (p<0.001). No association was found between palatine tonsil hyperplasia and oropharynx volume reduction. CONCLUSIONS (1) The nasal cavity volume was reduced when hypertrophic turbinates were diagnosed; (2) the nasopharynx was reduced when adenoid hyperplasia was diagnosed; and (3) the oropharynx volume of mouth-breathing children with tonsil hyperplasia was similar to that of non-obstructed mouth-breathing children. The adoption of the actual anatomy of the various compartments of the upper airway is an improvement to the evaluation method.

Applicability of Knowledge of Graduates in Dentistry: Use of Irreversible Hydrocolloid

El objetivo fue evaluar el conocimiento aplicado por estudiantes de odontologia en los procedimientos de desinfeccion, templado y vaciado de las impresiones de hidrocoloides irreversibles. Este estudio se llevo a cabo a traves de un cuestionario a 86 estudiantes de pregrado, de ambos sexos, del octavo y noveno periodo de la Escuela de Odontologia de la Pontificia Universidad Catolica, Belo Horizonte, MG. El cuestionario contenia 12 preguntas de opcion multiple acerca de los procedimientos clinicos y de laboratorio para impresion dental. Los datos fueron analizados de manera descriptiva y cualitativa. La mayoria de los sujetos (70%) declararon que hicieron desinfeccion de la impresion dental con pulverizacion de hipoclorito de sodio al 1%. Sin embargo, lo hicieron en recipientes abiertos (75,4%) y con un control de tiempo (68,6%). La relacion agua/polvo se realizo de manera aleatoria por la mayoria de los estudiantes (60,5%), utilizando principalmente agua del grifo (95,3%). La mezcla del sulfato de calcio se realiza manualmente por casi todos los estudiantes (97,7%) y el uso del vibrador durante el vertido del sulfato de calcio es comun (60,5%). El ajuste del sulfato de calcio tiene lugar predominantemente en exposicion al aire (93%), la remocion del modelo se hace entre 30 y 60 min despues del vaciado por un 84,9% de los estudiantes. Estos resultados apuntan a la necesidad de que los estudiantes tomen conciencia de las practicas transmitidas durante la licenciatura. Tambien es necesario investigar las posibles causas de los problemas de transmision de conocimiento y como aplicar efectivamente las buenas practicas clinicas.