To improve scan accuracy for crowns and bridges, focus on technique and environment: Moisture control is critical: Use cotton rolls, suction, and air drying. Saliva or blood will distort margins. Soft tissue management: Use retraction cords or gingival retraction paste to clearly expose margins. Follow correct scan path: Start from occlusal → lingual → buccal in one smooth motion. Avoid jumping randomly. Keep proper distance: Don’t get too close or too far from the tooth; maintain scanner-recommended range. Scan margins slowly: Spend extra time capturing preparation margins from multiple angles. Avoid excessive rescanning: Too many overlays can reduce accuracy. Check calibration: Regularly calibrate your scanner per manufacturer guidelines. Lighting & fogging: Ensure lens is clean and anti-fog if needed.