Smooth, slight Slight roughness Rough; wall not Divergent Bu; Li convergence B; L properly aligned walls walls Walls Slightly divergent M, D Rounded line Some sharp internal Most internal line All internal line Line angles; axio-pulpal line angles; angles are sharp angles sharp Angles line angle rounded line angle still rounded Guidelines for Class I Amalgam Restoration Accepted Accepted Accepted Unaccepted Guidelines 9 10 7.5 8.5 6.5 7 Below 6 – – – Interface between Over-contoured Restoration short of Open margins tooth and restoration margins, but still margin, but still Margins not detectable with closed closed explorer Proper intensity and In proper contact, Light occlusal Restoration is location of occlusal but inappropriate contact high/completely out Occlusion contacts location of occlusion Restoration Slight deviation Significant No resemblance to Anatomy duplicates tooth from ideal anatomy deviation from ideal tooth structure anatomy anatomy Burnished and Slight roughness Rough; some pits; Grossly rough smooth; no voids, voids Finish pits, or roughness
Walls Smooth, slight convergence B; L walls Slightly divergent M, D Slight roughness Rough; wall not properly aligned Divergent Bu; Li walls Line Angles Rounded line angles; axio-pulpal line angle rounded Some sharp internal line angles; line angle still rounded Most internal line angles are sharp All internal line angles sharp Guidelines for Class I Amalgam Restoration Guidelines Accepted 9 – 10 Accepted 7.5 – 8.5 Accepted 6.5 – 7 Unaccepted Below 6 Margins Interface between tooth and restoration not detectable with explorer Over-contoured margins, but still closed Restoration short of margin, but still closed Open margins Occlusion Proper intensity and location of occlusal contacts In proper contact, but inappropriate location Light occlusal contact Restoration is high/completely out of occlusion Anatomy Restoration duplicates tooth anatomy Slight deviation from ideal anatomy Significant deviation from ideal anatomy No resemblance to tooth structure Finish Burnished and smooth; no voids, pits, or roughness Slight roughness Rough; some pits; voids Grossly rough