•
They are designed to a proper bevel in gingival enamel of proximocclusal preparations; 100/75 pairs are for inlay/onlay preparations with steep gingival bevels; 90/85 pairs are for amalgam preparations with gingival enamel bevels that decline gingivally only slightly.
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Other use is rounding or beveling of the axiopulpal line of two surface preparations and placement of gingival lock in dentine.
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Distal GMT 10-92-6-12 mesial GMT 10-80-6-12.
iii. Angle formers •
These instruments are made by grinding the bevel at an angle of 80˚ with the shaft, thus forming an acute angle with the long axis of the blade. It may be described as a combination of a chisel and GMT.
•
It is monoangled , available in pairs i.e. left and right.
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Used in vertical, pull and push cutting motions.
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