An inlay or onlay is made out of ceramic or fiber-reinforced composite. The appropriate material is selected based on the material of the adjacent tooth, i.e., a natural, composite or porcelain tooth.
Why is it preferred?
In general, for the root canal treated tooth or severely decayed teeth, the decayed portion is cleared, as a result insufficient healthy tooth tissue is left. This makes impossible to contact with the adjacent teeth. If there is no contact point with the adjacent tooth, the food you consume is easily deposited in between and causes problems for the dental tissue and gums. The inlay or onlay is prepared on the mock-up, therefore the desired anatomic form and contact are achieved easily. In addition, it is more resistant to wear and chewing pressure that conventional filling material.