Clinical Assessment of Color Stability and Patient Satisfaction for Polished Versus Glazed Lithium Disilicate Glass Ceramic Restorations and Patient Satisfaction

Study Overview
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Brief Summary
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Dental overglaze is consist of colorless glass powder and applied to the fired crown surface to provide a glossy surface,Adjustment procedure break the production of the glaze layer through a natural glaze or overglaze process and create a rough surface, glazing or polishing after adjustment procedures is important to enhance the appearance of the restoration

Detailed Description
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Dental overglaze is consist of colorless glass powder and applied to the fired crown surface to provide a glossy surface. Natural glaze is a vitrified layer that is formed on the surface of the porcelain containing a glass phase when the porcelain is heated to a glazing temperature for a specific time, Adjustment procedure break the production of the glaze layer through a natural glaze or overglaze process and create a rough surface, The color of porcelain restorations is affected by surface roughness because rough surface reflects light irregularly and less than a glazed surface . Therefore, glazing or polishing after adjustment procedures is important to enhance the appearance of the restoration . Although glazed surfaces appeared whiter, the CIE L* value measured with the specular component excluded (SCE) geometry was lower than that of polished surfaces (28).Several reports have investigated different polishing techniques that support the use of polishing as an alternative for glazing of ceramic restorations . Polishing can reduce chair time, eliminates laboratory procedures, infection control may be obtained . Polishing is also important for the porcelain surface for esthetic so several different techniques have been described for repolishing porcelain surfaces in the mouth .

Official Title
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Clinical Assessment of Color Stability and Patient Satisfaction for Polished Versus Glazed Lithium Disilicate Glass Ceramic Restorations and Patient Satisfaction

Conditions
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Color Change of Lithium Disilicate Crowns

Intervention / Treatment
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* Other: glazed lithium disilicate crowns
* Other: polished lithium disilicate crowns


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: All subjects are required to be: From 18-50 years old, be able to read and sign the informed consent document. Physically and psychologically able to tolerate conventional restorative procedures have no active periodontal or pulpal diseases, have teeth with good restorations Willing to return for follow-up examinations and evaluation Exclusion Criteria: 1. Patients in the growth stage with partially erupted teeth 2. Patients with poor oral hygiene and motivation 3. Pregnant women's 4. Psychiatric problems or unrealistic expectations

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 60 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Active Comparator: glazed IPS e.max<br>lithium disilicate glazed crowns that proved to have a good color stability | Other: glazed lithium disilicate crowns<br>* glazing of IPS e.max crowns<br>* Other names: glazed IPS e.max;Other: polished lithium disilicate crowns<br>* polishing of IPS e.max crowns<br>* Other names: polished IPS e.max;|
| Experimental: polished IPS e.max<br>polished lithium disilicate crowns with the polishing kit | Other: glazed lithium disilicate crowns<br>* glazing of IPS e.max crowns<br>* Other names: glazed IPS e.max;Other: polished lithium disilicate crowns<br>* polishing of IPS e.max crowns<br>* Other names: polished IPS e.max;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| color stability | L* a* b* values and ∆E | one year | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| patient satisfaction | patient satisfaction through a questionnaire | one year |