Abstracts of the works presented at the - FOB/USP

[Pages:65]ABSTRACTS OF THE WORKS PRESENTED AT THE

21st Academic Conference of the Bauru School of Dentistry "Professor Flavio Fava de Moraes and Professor Aymar Pavarini"

Scientific Coordinator: Professor Jos? Alberto de Souza Freitas

President Gabriela Let?cia Natal?cio

Date: May 14-17, 2008

001

Evaluation of the irregularities produced on the dental surface of cavities for amalgam restorations comparing diamond and carbide burs

The main imperfection of an amalgam restoration is related to the inadequate preparation of the cavity to be restored, which must be as smooth as possible to allow a better adaptation of the restorative material to the tooth. This study compared the superficial smoothness of cavities prepared with cylindrical diamond and carbide burs of similar sizes, respectively #1090 and #56. Five cavities (4mm x 3mm wide and 2 mm deep) were prepared on the buccal surface, cervical region of sound molars, with each of rotary instruments. Thereafter, the cavities were duplicated with an elastomeric impression material (Permelastic - Kerr) and the impressions were analyzed and photographed in an optical microscope at ?12.8 magnification. The use of diamond burs promoted more irregularities, whereas the surface prepared with carbide burs was smoother, more regular and flatter, therefore more adequate for adaptation of an amalgam restoration.

Medeiros, Mariana Cardoso - cardosomedeiros@.br Evangelista, Naiara Tostes Pires, Humberto Carlos Carvalho Junior, Oscar Barreiros de

002

Reconstruction of maxillary bone defects using Ricinus communis polyurethane implants. Histomorphometric study in monkeys

Several studies have been developed with a variety of inorganic or synthetic grafts and compounds for bone recosntruction. Therefore, this study evaluated the bone repair process after osteotomies done in the anterior maxillary sinus wall and filled with Ricinus communis polyurethane implants. Four monkeys (Cebus apella) were used in this study. Ricinus communis polymer was implanted in the left maxillary sinus and no type of implant was placed in the right maxillary sinus. The analyses were performed 145 days after implant placement by means of histological and histometric examinations. The histological cuts were analyzed using the optic microscope and the computer program Image Lab 98. The perimeter of the bone implant contact was quantified and the numbers were converted in percentage. The results shows the bone-implant interface perimeter was 28.24% in the mamona polymer group and 58.4% in the control group. There was conjuntive fibrous tissue and moderate quantity of chronic inflammatory reaction in the mamona polymer group.

Campos, Katia Regina - kadedao@.br Garcia Junior, Idelmo Rangel Sabbag, Marcelo Abla Fujiwara, Carlos Alberto Machado, Bruno Carvalho

003

Balters Bionator and cervical headgear in Class II Division 1 malocclusion with mandibular retrognatism

Craniofacial alterations derived from the treatment of Class II Division 1 malocclusion with mandibular retrognathism by Balters Bionator and cervical headgear (KHG) were compared in a homogeneous sample of 88 lateral radiographs of 44 patients. Group I (KHG): 22 patients (6 boys, 16 girls), initial and final mean age (11.1; 14.1 years); Group II (Bionator), 22 patients (9 boys, 13 girls), initial and final mean age (10.7; 15.3 years), respectively. Lilliefors test, Student's t-test (for independent and paired samples), chi-square test and of Fisher's exact test were applied. The cervical headgear appliance restricted significantly the maxillary growth (p ................
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