The dental technician plays an important part in the making of an onlay. It takes skill and experience to fabricate an onlay from the impression that the dentist provides. The onlay must be very precise in its colour and dimensions.
The impression that is received from the dentist is used to make a plaster or stone cast of the prepared tooth or teeth. The cast is a copy of the tooth or teeth.
It allows the technician to make an onlay over the exact copy of a prepared tooth.
The technician will use the same shade/colour guide as the dentist, to ensure that the replacement onlay will match the colour of the adjacent teeth.