Spedding principle:
- a- Used for selection of stainless steel crowns.
- B- Used for selection of restorations.
- C- Used for selection of shade.
- D- Used for selection of sealant.
The Spedding principle is used for the selection of stainless steel crowns. So the answer is A.
The Spedding principle states that stainless steel crowns should be selected based on two factors:
- Occlusal-gingival crown length:
The crown should be long enough to cover the entire tooth from the occlusal surface to the gingival margin. However, it should not be so long that it interferes with the occlusion or impinges on the gingival tissue.
- Crown margins:
The margins of the crown should be contoured circumferentially to follow the natural contours of the marginal gingiva of the tooth. This will help to ensure that the crown fits snugly and does not irritate the gingival tissue.
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