Using dental ceramics in treating patients with worn teeth. A randomized clinical trial.

INTERVENTION: Participants are randomized into two groups according to a randomization list generated by a website (www.randomization.com). The first group receives IPS e.max press (glass infiltrated lithium disilicate) crowns and the second group receives monolithic BruxZir Crowns (translucent zirconium oxide). As a standard procedure, diagnostic mock‐up and laboratory fabricated temporary bridges precede the prosthetic therapy. Increasing the vertical dimension is only performed when needed. All restorations are adhesively luted and are examined at 2‐4 weeks (baseline), 1 year, 3 years, 5 years after completion of the treatment. CONDITION: Tooth wear ; Oral Health ; Tooth wear PRIMARY OUTCOME: ; 1. Clinical performance and success rate of the crown is assessed using clinical photographs taken 2‐4 weeks (baseline) and follow up visits 1, 3 and 5 years after completion of the treatment.; 2. Technical outcome of the reconstructions is examined using the united States Public Health Service (USPHS) criteria at 2‐4 weeks (baseline) and follow up visits 1, 3 and 5 years after completion of the treatment.; SECONDARY OUTCOME: The subjective opinion of each patient is measured using the international OHIP and OAS scales at 2‐4 weeks (baseline) and 1, 3 and 5 years after completion of the treatment. INCLUSION CRITERIA: 1. Aged 17‐65 years. 2. At least 10 teeth in the upper and lower arches 3. Good periodontal status 4. At least TW > grade 2 on any tooth surface on at least four teeth in the same arch according to Smith and Knight’s tooth wear index (TWI)