In an anterior tooth to be restored with composite restoration, which of the following regarding the primary resistance form is false?
Weakened, friable tooth structure always should be removed at this step (Primary resistance form) in the preparation. Unsupported but not friable enamel may be left for esthetic reasons in anterior teeth, where stresses are minimal and a bonded composite restoration is anticipated.​
NOTE: Rounding of axiopulpal line angle, rounding of internal line angles and horizontal pulpal and gingival walls are primary resistance forms.
Reference: Sturdevant operative dentistry. 7th EDITION, Page No:128
Horizontal pulpal and gingival walls
All unsupported enamel need not be removed
Rounding of internal line angles
None of the above