Custom-made Versus Prefabricated Zirconia Crowns for Primary Molars; a Clinical Trial With 12-month Follow-up.

This study is a randomized, 12-month follow up clinical trial. According to sample size calculation, ten patients will be selected in conjunction with departments of Pedodontics and Crowns & Bridges. The study will be conducted in accordance with the principles of the Research Ethics Committee, Faculty of Dental Medicine for Girls, Al-Azhar University, Egypt.

The purpose of the investigation and the clinical procedures of this study will be explained to the parents and children. A written informed consent form will be signed from patient guardians and obtained prior to study initiation. The inclusion and exclusion criteria are established as the following;

• Inclusion criteria

1. Children of 5-9 years old.
2. The children have at least 2 pulpotomized primary molars with no clinical signs & symptoms or periapical pathosis.
3. Presence of an intact contralateral primary molar as a control.
4. Willingness to participate and to continue with the follow up appointments.
5. Clinical and radiographically confirmed dental caries extending to the middle third of dentin.
6. Presence of teeth in opposite arch with normal occlusion.

• Exclusion criteria

1. Children with systemic health problem.
2. Children with periodontal disease.
3. Children with unilateral chewing habit or allergic to local anesthesia.
4. Presence of parafunctional habit.

• Clinical procedure;