3M ESPE Polycarbonate Crown Refills have contour and crimp for easy adaptation to margins. Plastic teeth molds universal shade on 3M polycarbonate prefabricated crowns can be custom adjusted with cement and liners. Prefabricated crowns are strong and durable and can be used for short or long term use. Box of 5. We have all numbers/sizes of refill plastic teeth molds available.