Wear Behavior of Milled Posterior Crowns Fabricated From the New Monolithic Zirconia 5Y-TZP/3Y-TZP Compared to Lithium Disilicate

Cairo University24 enrolled

Overview

In-vitro studies do not represent the actual masticatory environment and cannot simulate the intricate chewing pattern. Hence, there is a need for an in vivo study evaluating the wear potential of the newly introduced strength - color gradient multilayered zirconia IPS e.max ZirCAD Prime (5Y-TZP/3Y-TZP) and compare it to Lithium Disilicate IPS e.max CAD which has proven to have favorable wear patterns.

* There will be no difference in wear caused by monolithic Zirconia (5Y-TZP/3Y-TZP) IPS E-max ZirCad Prime and Lithium Disilicate IPS e.max CAD to the antagonist. * There will be no difference in the wear of the new monolithic zirconia IPS e.max ZirCAD Prime and lithium disilicate IPS e.max CAD.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

OTHER

Masking

DOUBLE

Enrollment

Conditions

Posterior Teeth Worn Posterior Teeth Endodontically Treated Teeth Crowned Posterior Teeth

Interventions

monolithic zirconia (5Y-TZP/3-YTZ) ZirCAD Prime.OTHER

wear of the new material of monolithic zirconia (5Y-TZP/3-YTZ) ZirCAD Prime in posterior teeth

Lithium Dislicate IPS e.max crownOTHER

wear of lithium disilicate IPS e.max crown in posterior teeth

Eligibility

Sex: ALLMin age: 21 YearsMax age: 50 Years

Medical Language ↔ Plain English

Inclusion Criteria: * All subjects are required to: 1- Be aged 21-50 years old, be able to read and sign the informed consent document. 2- Psychologically and physically able to withstand conventional dental procedures. 3- Patients with mutilated posterior teeth indicated for full coverage restorations. 4- Patients with sound natural antagonists. 5- Able to attend punctually for preplanned visits and evaluation. 6- Have no active periodontal or pulpal diseases. 7- There should be no apparent loss or wear in opposing enamel. Exclusion Criteria: 1. Patient with active resistant periodontal diseases. 2. Patients with parafunctional habits and bruxism. 3. Patients with poor oral hygiene, high caries risk and uncooperative patients. 3- Pregnant women. 4. Patients in the growth stage with partially erupted teeth. 5- Psychiatric problems or unrealistic expectations. 6- Lack of opposing dentition in the area of interest. 7- Restored occlusal surface opposing the planned restoration. 8- The presence of a removable or fixed orthodontic appliance.

Outcomes

Primary Outcomes

The amount of occlusal wear in natural antagonist enamel caused by the restorative material

The amount of occlusal wear in natural antagonist enamel, using digital superimposition of model scans after 1 year, measured in micrometer.

Time frame: 1 year

Secondary Outcomes

The amount of occlusal wear in the restorative material itself

The amount of occlusal wear in the restorative material itself, using digital superimposition of model scans after 1 year, measured in micrometers.