Scanning electron microscopic and profilometric study of different sharpening stones

Scaling and root planing contribute to the recovery of periodontal health. All periodontal instruments loose their fine cutting angle after use. To maintain this angle, correct sharpening is required using specifically designed stones. The characteristics of sharpening stones can be compared to the blade of the instruments and also transported to root surface during instrumentation. Root smoothness is related to the quality of the blade. Therefore, the purpose of this study was to evaluate the characteristics of 9 sharpening stones by scanning electron microscopic and profilometric analyses. Ceramic and Neumar stones were very fine and both may be recommended to maintain the sharpness of the instruments. Arkansas, Thompson and CE stones presented greater roughness with very regular and round particles, and are suitable for maintenance of the cutting angle. In addition, these stones may be indicated for the routine sharpening of the instruments that are partly dull. Oxide Aluminum, Carborundum and JON stones were the coarsest with large irregular particles and may be indicated for initial sharpening of totally dull instruments with completion of sharpening with finer stones.

Scanning electron microscope assessment of several resharpening techniques on the cutting edges of gracey curettes

Aim: Treatment of periodontal diseases is based on efficient scaling and root planing (SRP) and adequate maintenance of the patient. The effectiveness of SRP is influenced by operator skill, access to the subgingival area, root anatomy, and the quality and type of instrument used for SRP. The aim of this study was to evaluate the cutting edges of Gracey curettes after manufacturing and after resharpening using several techniques. Methods and Material: The cutting edges of a total of 41 new #5-6 stainless steel Gracey curettes were evaluated blindly using scanning electron microscopy (SEM). The quality of the cutting edges was evaluated blindly by a calibrated examiner using micrographs. Data were analyzed using a Kruskal Wallis test and nonparametric two-way multiple comparisons. Results and Conclusions: Different sharpening techniques had significantly different effects on the sharpeness of cutting edges (p<0.05). Sharpening by passing the lateral face of curettes over a sharpening stone and then a #299 Arkansas stone produced a high frequency of smooth, sharp edges or slightly irregular edges between the lateral and coronal faces of the curettes. Sharpening by passing a blunt stone over the curette's lateral face produced the poorest quality cutting edge (a bevel). Sharpening of the coronal curette face produced extremely irregular cutting edges and non-functional wire edges. Sharpening with rotary devices produced extremely irregular cutting edges.

Prevalence of neoplasia diagnosed in dogs at the veterinary hospital at eduardo mondlane university, mozambique

A retrospective study of tumors in dogs was carried out in the School Veterinary Hospital (HVE), Eduardo Mondlane University, Mozambique, between January 2004 and January 2009. Data from clinical-surgical records of tumor samples surgically removed, necropsy and cytological exams were used and sent for histopathology exams. During the study 210 tumors and about 27 different types of tumors were identified. Skin tumors (61.0%) were the most frequent, followed by mammary gland tumors (27.60%), reproductive system tumors (11.90%) and bone system tumors. The mammary gland tumors were observed only in females, with high prevalence in bitches which were not spayed or spayed after two years old. It was concluded that the neoplasia prevalence increase was correlated to the higher longevity of dogs, and breed also contributed for the development of determined tumors due to high incidence of mastocitomas in Boxer and German Shepherd breeds. The 100 % incidence of mammary gland neoplasia in females confirmed the higher predisposition for mammary gland neoplasia in females.

Em busca do Império: a trajetória intelectual e política de Eduardo Prado

Pós-graduação em História - FCHS

A epístola revisitada: identidade, linguagem e intertextualidade em Nação Crioula, de José Eduardo Agualusa

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Poesia e composição na canção: estudo analítico dos Três Cantos de Hilda Hilst (2002) de Almeida Prado e de canções do álbum Poesia Paulista (1998) de Achille Picchi, Eduardo Guimarães Álvares e José Augusto Mannis; composição comentada da canção A Casa do Tempo Perdido (2008) de Diogo Lefèvre

Pós-graduação em Música - IA

Dieta e morfologia trófica de duas espécies simpátricas de peixes voadores (Hemidous microlepis e Hemiodus unimaculatus) na região do médio curso do rio Tocantins, na área de influência da UHE Luís Eduardo Magalhães - TO

Pós-graduação em Ciências Biológicas (Zoologia) - IBRC

Termos eponímicos do domínio da dermatologia: conceito, estrutura morfossintática e léxico-semântica e uso em comunicação médica

Pós-graduação em Estudos Linguísticos - IBILCE

Medidas e modelos de estimativa da radiação direta na incidência: Eduardo Nardini Gomes. -

Pós-graduação em Agronomia (Irrigação e Drenagem) - FCA

Adubação potássica e desenvolvimento de clones de eucalipto cultivados em Luís Eduardo Magalhães-BA

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

O perigo das águas: aspectos do feminino terrível em Gustavo Adolfo Bécquer, Octavio Paz e Eduardo Galeano

Pós-graduação em Estudos Literários - FCLAR

O eterno feminino: arquétipos literários em Mujeres de Eduardo Galeano

Le champ littéraire est plein d’oeuvres qui remettent à des mythes. L’ensemble de récits Mujeres, de Eduardo Galeano, a comme thématique la femme et il est composé par des micro-contes, genre narratif qui promeut une condensation maximale d’eléments thématiques et structuraux. Il s’agit des descriptions littéraires où la synthèse est placée ou même niveau que le lyrisme. Ayant pour objectif d’analiser la nature archétypique des mythes sur la féminité, nous avons travaillé spécifiquement les contes de Mujeres où se reconstruisent poétiquement des mythes de la féminité. Méthodologiquement, notre notre étude a pour base la mythocritique et la théorie des structures anthropologiques de l’imaginaire ídéalisées par Gilbert Durand. En partant de ces bases, nous avons réalisé l’analyse des récits qui s’articulent en notre corpus, ayant pour but, celui d’identifier les divers artifices narratifs spécifiques qui y opèrent. Par le moyen des mythèmes présents dans les récits, nous avons révélé les structures archétypiques du texte et nous avons constaté comment elles s’édifient littérairement. En outre, nous avons élucidé la teneur de la représentativité archétypique de la feminité inhérente aux récits et finalement, nous avons rassemblé les situations et les combinatoires qui existent dans l’ensemble de microrécits, traçant les connexions possibles qui y existent. Ainsi, nous avons fait une étude proprement dite, d´analyse mythocritique

Memória e historiografia no documentário: o fim e o princípio de Eduardo Coutinho

Pós-graduação em Ciências Sociais - FFC

A proximidade discursiva nas cartas dos romances A correspondência de Fradique Mendes, de Eça de Queiroz e Nação crioula: A correspondência secreta de Fradique Mendes, de José Eduardo Agualusa

Pós-graduação em Letras - FCLAS

O poema em música e a música além do poema: estudo sobre a relação entre música e poesia em obras de Almeida Prado, Eduardo Guimarães Álvares e Harry Crowl

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)