To provide maximum strength of amalgam restoration the cavo-surface angles should:
1- Approach 75 ° with outer surface.
2- Approach 90 with outer surface.
3- Be supported by sound dentine.
4- Be located in area free of occlusal stress.
1+3 and 4.
1+3.
2+3+4.***
3+4.
1- Approach 75 ° with outer surface.
2- Approach 90 with outer surface.
3- Be supported by sound dentine.
4- Be located in area free of occlusal stress.
1+3 and 4.
1+3.
2+3+4.***
3+4.
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