Who gave the concept of well adapted crown?

- 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; and b. The crown margins should be shaped circumferentially to follow the natural contours of the tooth’s marginal gingivae.