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evaluation of color difference between zirconia reinforced lithium silicate (celtra press) VS lithium disilicate (Emax) in relation to natural tooth structure to determine which monolithic material will provide restoration with exact shade and optical properties as natural tooth structure.
eligible patients will be randomized in 2 equal group between study group (celtra press) and control group (Emax) .
Single tooth in esthetic zone requiring full coverage crown is prepared to receive an all ceramic crown of .
Grouping: The crowns will be divided into two groups:
I:Teeth receiving crowns fabricated from IPS emax press ( ivoclarvivadent) II:Teeth receiving crowns fabricatedfrom Celtrapress(dentsplysirona).
Shade will be measured using intraoral spectrophotometer and evaluated.
The color difference (ΔE ) will be calculated for each sample using the following equation: ΔE =[(ΔL*)²+(Δa*)² + (Δb*)²]½
ΔE (perceptibility threshold ) will be evaluated for each group.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| IPS e.max Press(lithium di silicate) | Active Comparator | Lithium disilicate reinforced glass ceramics are available in the market in two forms according to the technique of manufacturing, either heat pressed ingots or CAD/CAM blocks for milling. The heat pressed lithium disilicate glass ceramic consists of approximately 70% lithium disilicatecrystals(the main crystal phase) having a needle like shape that are embedded in a glassy matrix. The crystals length is about 3 to 6 μm. The heat pressed ingots are fully crystallized and the restoration is fabricated by the lost wax technique where the lithium disilicate ingots are pressed into the investment mold at high temperature. The pressed lithium disilicate has strong flexural strength values(range 400 ± 40 MPa) |
|
| Celtra Press | Experimental | new class of zirconia-reinforced lithium silicate material available to labs for pressing. This unique material provides top aesthetics and is virtually impossible to tell apart from a natural tooth. Celtra Press is a multiphase ceramic consisting of a glass matrix and lithium disilicate crystals having a crystal length of about 1.5 µm plus nano-scale lithium phosphate . In addition to Li2O and SiO2, Celtra Press contains about 10% zirconia (ZrO2), which is dissolved completely in the glass phase rather than in crystalline form. Celtra Press is characterized by a high strength of about 500 MPa and excellent flow properties during pressing. |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Celtra Press | Other | new class of zirconia-reinforced lithium silicate material available to labs for pressing. This unique material provides top aesthetics and is virtually impossible to tell apart from a natural tooth. Celtra Press is a multiphase ceramic consisting of a glass matrix and lithium disilicate crystals having a crystal length of about 1.5 µm plus nano-scale lithium phosphate . In addition to Li2O and SiO2, Celtra Press contains about 10% zirconia (ZrO2), which is dissolved completely in the glass phase rather than in crystalline form. Celtra Press is characterized by a high strength of about 500 MPa and excellent flow properties during pressing. |
| Measure | Description | Time Frame |
|---|---|---|
| Color match | using USPHS scoring system | immediately after crown cementation |
| Measure | Description | Time Frame |
|---|---|---|
| Patient satisfaction | Patient satisfaction using Visual Analogue scale- Binary (Satisfied or not satisfied) | immediately after crown cementation |
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Inclusion Criteria:
1. Age range of the patients from 20-45 years old; able to read and sign the informed consent document, illiterate patient will be avoided.
2. Patients able physically and psychologically to tolerate conventional restorative procedures.
3. Patients with no active periodontal or pulpal diseases, having teeth with good restorations.
4. Patients with teeth problems indicated for full coverage restoration ( coronal fracture where partial coverage would lack retention, malposed or malformed teeth).
5. Patients with root canal treated teeth requiring full coverage restorations with contralatral tooth not filled orfractured.
6. Patients willing to return for follow-up examinations and evaluation.
Exclusion Criteria:
Patients in the growth stage with partially erupted teeth.
Patients with poor oral hygiene and motivation.
Pregnant women's to avoid any complication that may occur in dental office due to pregnancy or due to injected anesthetic solution.
Patients with psychiatric problems or unrealistic expectation
Patients have no opposite occluding dentition in the area intended for restoration\
Patients suffer from parafunctional habits.
deep discoloration of abutment .
Smokers and heavy caffeine consumers.
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| Name | Role | Phone | Extension | |
|---|---|---|---|---|
| mohamed bekhiet, master degree student | Contact | 01224238808 | mohamed.bekhet@dentistry.cu.edu.eg |
| Name | Affiliation | Role |
|---|---|---|
| Mohamed zamzam, professor | Fixed Prosthodontics Faculty of Oral and dental medicine Cairo University | Principal Investigator |
| Maha Taymour, Associate professor | Fixed Prosthodontics Faculty of Oral and dental medicine Cairo University |
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