| 摘要 |
<p>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.</p> |
