<prompt> Who gave the concept of well adapted crown?WinklerSpeddingWebberWilkinson  <response>: - The smallest crown that completely covers the preparation should be chosen.- Spedding has advocated adhering to two important principles that will help consistently to produce well-adapted stainless steel crowns.a. The operator must establish the correct occluso-gingival crown length; andb. The crown margins should be shaped circumferentially to follow the natural contours of the tooths marginal gingivae. 