Dental impression tray

A - Human Necessities – 61 – C

Patent

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A61C 9/00 (2006.01)

Patent

CA 2221772

The modulus of elasticity and yield strength of a rigid core rod (24) are set within predetermined limits as to limit the elastic deformation and prevent plastic deformation of a dental tray (20) during multiple impression taking, bite registration, and subsequent handling. The tray (20) is formed with a frame (22) which provides a positive recovery force when it is flexed. The cross section of the core rod (24) may be optimized to further limit deflection in a predetermined plane. Various preferred materials including non- woven spun bonded filaments are selected for supporting impression material (30) on the tray (20) while minimizing the likelihood of obstructing a patient's teeth during full occlusion.

Le module d'élasticité ainsi que la limite d'élasticité d'une tige centrale rigide (24) sont établis dans des limites pré-déterminées de manière à limiter la déformation élastique et à empêcher la déformation plastique d'un porte-empreinte (20) pendant la prise d'impressions multiples, la prise d'occlusion et la manipulation ultérieure. Le porte-empreinte (20) est constitué d'un cadre (22) produisant une force de récupération positive lorsqu'il est fléchi. La section de la tige centrale (24) peut être optimisée afin de limiter davantage la déflexion dans un plan pré-déterminé. On a sélectionné divers matériaux préférés, y compris des filaments non tissés filés-liés, afin de porter une matière d'impression (30) sur le porte-empreinte (20) tout en réduisant au minimum la probabilité d'obstruction des dents d'un patient lors d'une occlusion totale.

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