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公开(公告)号：EP0836442A1
公开(公告)日：1998-04-22
申请号：EP96914759.0
申请日：1996-05-23
IPC分类号： A61C9
CPC分类号： A61C9/0006
摘要： 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.
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公开(公告)号：EP0726742A1
公开(公告)日：1996-08-21
申请号：EP95901169.0
申请日：1994-11-04
IPC分类号： A61C9
CPC分类号： A61C9/0006
摘要： An impression tray (10) for making impressions of the upper and lower teeth. The tray includes a mouthpiece (13) and a handle (12). The mouthpiece (13) includes an outer wall (14), inner wall (16) and a base (18) connected between the walls (14, 16) at a bottom thereof. The walls (14, 16) each have vertical slits (54, 68) spaced along their length. Each slit (54, 68) has a shoulder (60, 73) therein providing an interlock for the impression material displaced therethrough. The base (18) includes ribs (88) on its top, each rib (88) extending between the walls (14, 16) and alternating with the slits (54, 68) on the walls. Between each adjacent pair of ribs (88) are two holes (90) extending through the base (18). The base (18) is also attached, on its bottom, to a platform structure. The platform structure provides a flat surface for the tray and forms reservoirs (102) around the base holes (90). The combination of the ribs (88) and the platform structure provides a rigid structure, thereby producing an impression with a minimal possibility of deformation.
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