Final answer:
No, build up is not always required when completing a crown. Build up is typically done when the tooth has been heavily damaged or decayed, requiring additional support. However, if the tooth is already structurally sound, build up may not be necessary.
Step-by-step explanation:
No, build up is not always required when completing a crown. Build up is a process where a tooth is built up with filling material before attaching a crown. It is typically done when the tooth has been heavily damaged or decayed and needs additional support. However, if the tooth is already structurally sound, build up may not be necessary.
For example, if a tooth only has minor damage or decay, the dentist may be able to simply prepare the tooth and directly place the crown on top without the need for buildup.