Avaliação de dispostivo alternativo ao arco facial para montagem de modelos em articuladores semi-ajustáveis
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Data
2011-04-26
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Universidade Federal de Goiás
Resumo
The aim of this study was to analyze the face-bow and three different camper
planes, 0°, 15° e 20°, regarding the placement of maxillary cast and the fidelity of
reproduction of occlusal contacts of casts mounted in semi-adjustable articulator arcon
type. Were selected nine students over 18 years showing complete natural dentition
whose cast maxillaries presented stable on surface plane. The 36 cast maxillaries were
mounted in a single semi-adjustable articulator using four different techniques: facebow,
camper plane of 0º, camper plane of 15º and camper plane of 20º. The first
analysis was considering the position of the cast maxillary. On each side of the
articulator were defined three points: one in the articulator, the condylar region (A) and
two in the cast (B and C). Point B was positioned at the lower first molar buccal groove
(intercuspal region) and C at the midpoint of the first molar (mesio-distal), 1cm above
the intercuspal region. Through the digital camera (Rebel XTi) positioned at a standard
distance of 1.15 m of articulating images were obtained on each side of the articulator.
Using the software Image J was given angle "α" formed by the intersection of the line
segments AB and BC. For analysis reproducibility of occlusal contacts the cast
mandibles were mounted in maximum intercuspation. The points of contact clinical and
casts were recorded with carbon Accufilm. The area (mm2) of the points of contact on
the lower left first molar of each group was quantified in Image J software, using
images obtained with a digital camera (Rebel XTi). As for the positioning of the cast
maxillary no significant difference was found just between the plane and the face-bow
(p<0.001). None of the mounting techniques were effective in reproducing clinical
contact points (p<0.001).
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Citação
HARTMANN, Roberto. Evalution of alternative dispostives to the face-bow for mounting casts in semi-adjustable articulatores. 2011. 37 f. Dissertação (Mestrado em Ciência da Saúde) - Universidade Federal de Goiás, Goiânia, 2011.