SECONDARY RETENTION AND RESISTANCE FORMMay be performed after placing liners and bases.1. Amalgams pins2. Slots - No.35 inverted cone bur3. Boxes4. Coves5. Skirls6. Bevels- Reverse bevels in inlay prepAMALGAM PINS➢ For 2 degree retention and resistance form.➢ Should be placed parallel to line angles.➢ 2 mm into the dentine & 2mm in the amalgam➢ Distance between 2 pins ー 3-5 mm➢ Place minimum/less material and condense (if more - cracks may form)➢ Pins need not be parallel to each other➢ Use one pin per missing line angle, cusp or marginal ridge.➢ Use large diameter pin whenever possible➢ Use min no. of pins compatible with adequate retention➢ Complication :- pulp exposure ⇒ DPC + place pin on same day.

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