Avaliação da localização do canal mandibular por meios de exames tomografico (linear, Pluridirecional e computadorizados de alta resolução) em comparação com a anatomia ossea topografica

AUTOR(ES)
DATA DE PUBLICAÇÃO

2000

RESUMO

The aim of this study was compare the vertical and horizontal dimensions in images obtained from dried skulls by means of three types of tomographic exams: linear; transversal pleuridirectional panoramic and computerized high resolution with bone topographic anatomy. The selection of a precise radiographic method proved to be of great importance in the planning of osteointegradable implants. Such approach would imply the reduction of traumatic lesions to noble structures of the maxillomandibular complex during surgery. With this purpose, eleven dried mandibles ITom the Radiology Department of the Dentistry University of Piracicaba.( FOP, Unicamp) were analyzed. All of these presented an edentuous posterior and type B alveolar bone reabsorption according to LINDH, C et al.( 1995 ). Twenty two inferior alveolar canals ( CAI ) were selected and 88 measurements were accomplished. Four measurements were made on each mandible: V1,which corresponded the distance of the alveolar ridge to the center of the CAI; V2, the distance of the external cortical of the mandibular base to the center of the CAI; RI, the distance of the center of the CAI to the external lingual cortical; m, the distance from the center of the CAI to the external bucal cortical. Radiographic guides were built at regions of interest before the exposition of metallic step ( 4mm diameter) for conventional exams. Also, gutta percha guides were introduced for high resolution computerized tomography making possible the elimination of artifacts. The equipment used were the SIRONA, Orthophos CD plus, with pI9 and p20 programs of transversal pleuridirectional slices (60kV and 09 mA and slice thickness of 3,0 mm), the Linear Denar Quint Sectograph tomographer with cefalostat ( 52kV and 50 mA and slice thickness of 2,5 mm and intervals between slices of 3,0mm) and the Siemens, SOMATOM HiQ-S computerized high resolution tomographer, opting for direct coronal slices that were based on the FARIA CR-IMP ( 1999 ) protoco1. After images were obtained, measurements were made with a MITUTOYO paquimeter and compared to the sliced mandibles. The mean results of the measurements were later applied to varience analysis and Tuckey test. The following results were obtained for linear tomography: VI - 13,19 mm; V2 - 8,73 mm; Hl 5,11mm; H2 - 6,44 mm. As for computed tomography: V1- 11,12 mm; V2 - 7,55 mm; H1 - 5,22 mm; H2 - 6,22 mm; while pleuridirectional tomography: V1- 15,85 mm; V2 - 10,17 mm; H1 - 6,45 mm; H2 - 8,10 mm. Further more, the anatomic measurements: VI - 13,04 mm; V2 - 8,70 mm; H1 - 5,36 mm; H2 - 6, 18mm. These results have not proved a significant statistical difference between the mean results of measurements in linear tomography exams. However, the exams computed tomography, once these presented a minimal discrepancy with a significant statistical different in the vertical mensurement when compared to the real anatomic measurements and pluridirectional presented significant statistical difference in alI of the mensurements Fina1ly, this subject conc1udes that linear tomography was more accurate for dental osteointegradable planning

ASSUNTO(S)

tomografia implantes dentarios endoosseos

ACESSO AO ARTIGO

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