RESUMO
This study compared the buccolingual inclination of the posterior teeth in subjects with a horizontal growth pattern (proportionally short lower anterior face height) with that of subjects with a vertical growth pattern (proportionally long lower anterior face height). Seventy subjects with permanent dentition were divided into 2 groups. Group I comprised 35 subjects (16 male, 19 female) with Class II Division 2 malocclusion with a horizontal growth pattern, and group II comprised 35 subjects (15 male, 20 female) with a vertical growth pattern. Buccolingual inclinations of the first molar and second premolar were indirectly assessed on photocopies of buccolingual sections of these teeth by measuring their occlusal surface (represented by an imaginary line connecting the lingual and buccal cusps) inclination. The groups were compared with t tests (P <.05). The maxillary posterior teeth of subjects with a vertical growth pattern had a significantly greater buccal inclination compared with those of subjects with a horizontal growth pattern. However, there were no statistically significant differences in the inclinations of the mandibular posterior teeth between the 2 groups.
Assuntos
Dente Pré-Molar/patologia , Má Oclusão Classe II de Angle/patologia , Desenvolvimento Maxilofacial/fisiologia , Dente Molar/patologia , Adolescente , Adulto , Cefalometria , Criança , Feminino , Humanos , Masculino , Má Oclusão Classe I de Angle/patologia , Má Oclusão Classe I de Angle/fisiopatologia , Má Oclusão Classe II de Angle/fisiopatologia , Mandíbula/patologia , Maxila/patologia , Nariz/patologia , Dimensão VerticalRESUMO
The postnatal growth of the mouse pancreas was studied using stereological methods. The measurements obtained included gland mass, total cell number, the number and frequency of cells in each morphological comportment and the nuclear and cytoplasmic volume of the acinar cells. Pancreatic mass increased significantly (>10,000 fold) in the first 70 days of life and this was accompanied by an increase of 6,841 per cent, 7,027 per cent, 4,864 per cent and 3,360 per cent, respectively. During the same period, the mean acinar cell volume increased by only 146 per cent. These results showed that growth of the mouse pancreas during postnatal development, occurred through intense profiferative activity of all cell types and by an increase in the size of individual cells, notably the acinar cells.
