Color Change of Lithium Disilicate Crowns
Conditions
Brief summary
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
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 .
Interventions
OTHERglazed lithium disilicate crowns
glazing of IPS e.max crowns
OTHERpolished lithium disilicate crowns
polishing of IPS e.max crowns
Sponsors
Cairo University
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
SINGLE (Subject)
Masking description
participant, outcome assessor double blind
Eligibility
Sex/Gender
ALL
Age
18 Years to 60 Years
Healthy volunteers
No
Inclusion criteria
* All subjects are required to be: 1. From 18-50 years old, be able to read and sign the informed consent document. 2. Physically and psychologically able to tolerate conventional restorative procedures 3. have no active periodontal or pulpal diseases, have teeth with good restorations 4. 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
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| color stability | one year | L\* a\* b\* values and ∆E |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| patient satisfaction | one year | patient satisfaction through a questionnaire |
Contacts
Primary Contactrasha sayed MOSALLAM, MDS
Backup ContactHesham katamish, professor
Outcome results
None listed