Optical Properties of Laminate Veneers
Conditions
Keywords
laminate veneers, luting agent
Brief summary
The aim of this randomized clinical trial is to evaluate the influence of luting agent, thickness and color of laminate veneers (LVs) and color of dental substrate on the optical properties of LVs.
Detailed description
The following date will be collected (i) the color of dental substrate obtained before and after dental preparation, (ii) the thickness and color of the LVs obtained before of the cementation procedures on white and black value background, (iii) and the final color of the LVs bonded to dental substrates obtained after cementation. For LVs cementation two cements will be used, the light-cured resin cement and the flowable composite, which will be randomly divided into two groups (n=31). The color of LVs will be performed with visual evaluation based on Vita and 3D Master scales and with a spectrophotometer Vita Easyshade (Vita Zahnfabrik / Bad Saeckingen, Germany) based on CIEL\*a\* b system. Data collected will be evaluated for translucency parameter (TP) and color variation (ΔE) according to luting agent, thickness and color of the LVs as well as color of dental substrate. Additionally, the color obtained with visual evaluation and with spectrophotometer will be compared to evaluate the level of agreement between the color observed by the operator and the color named by the spectrophotometer.
Interventions
PROCEDURELaminate veneers luted with light-cured resin cement
After the use of light-cured luting agent the color of laminate venners will be performed with visual evaluation based on Vita and 3D Master scales and with a spectrophotometer Vita Easyshade (Vita Zahnfabrik / Bad Saeckingen, Germany) based on CIEL\*a\* b system. Data collected will be evaluated for translucency parameter (TP) and color variation (ΔE) according to luting agent, thickness and color of the LVs as well as color of dental substrate. Additionally, the color obtained with visual evaluation and with spectrophotometer will be compared to evaluate the level of agreement between the color observed by the operator and the color named by the spectrophotometer.
PROCEDURELaminate veneers luted with light-cured flowable composite
After the use of light-cured luting agent the color of laminate veneers will be performed with visual evaluation based on Vita and 3D Master scales and with a spectrophotometer Vita Easyshade (Vita Zahnfabrik / Bad Saeckingen, Germany) based on CIEL\*a\* b system. Data collected will be evaluated for translucency parameter (TP) and color variation (ΔE) according to luting agent, thickness and color of the LVs as well as color of dental substrate. Additionally, the color obtained with visual evaluation and with spectrophotometer will be compared to evaluate the level of agreement between the color observed by the operator and the color named by the spectrophotometer.
Sponsors
Federal University of Pelotas
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
SINGLE (Outcomes Assessor)
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
Yes
Inclusion criteria
* Minimum 18 years of age * Patients with diastema * Conoid teeth * Misaligned anterior teeth * Discolored teeth and/or teeth with erosion/abrasion * Posterior occlusal stability * Individuals who are willing to attend the clinics on predetermined days, to agree to sign the consent form and clarified, after receiving information about the study objectives, risks and benefits associated with the procedures.
Exclusion criteria
* Patients with extensive loss of tooth structure * Subjects suffering from temporomandibular disorders, neurological and oral mucosa diseases * Inadequate oral hygiene or periodontal problems * Smokers
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Optical Properties of Laminate Veneers | after luting the laminate veneers (at least 1 hours after cementation) | The color of laminate veneers will be performed with a spectrophotometer Vita Easyshade (Vita Zahnfabrik / Bad Saeckingen, Germany) based on Vita and 3D Master scales and on CIEL\*a\* b system. Data collected will be evaluated for translucency parameter (TP) and color difference (ΔE) according the thickness and color of the laminate veneers as well as color of dental substrate. The acceptable threshold color difference for the CIEDE2000 method is 1.8 (Paravina et al, 2015). Greater color variation is desirable when a shade match between darker and lighter adjacent tooth substrates is required and values above the clinical thresholds for acceptability of color differences indicating lower masking ability of the material. Level of Agreement Between the Color Observed by the Operator and the Color Named by the Spectrophotometer was included as a Primary or Secondary Outcome Measure, but data was not collected. |
Countries
Brazil
Participant flow
Participants by arm
| Arm | Count |
|---|---|
| Light-cured Resin Cement - Light-cured Flowable Composite Ceramic restorations were cemented using translucent shade of photoactivated resin cement or Light-cured flowable composite. Participants enrolled in both arms, luting material to be used was randomly selected. | 11 |
| Light-cured Resin Cement - Light-cured Flowable Composite Ceramic restorations were cemented using translucent shade of photoactivated resin cement or Light-cured flowable composite. Participants enrolled in both arms, luting material to be used was randomly selected. | 38 |
| Total | 49 |
Baseline characteristics
| Characteristic | Light-cured Resin Cement - Light-cured Flowable Composite |
|---|---|
| Age, Continuous Age | 39.6 years STANDARD_DEVIATION 13.4 |
| Sex: Female, Male Female | 4 Participants |
| Sex: Female, Male Male | 7 Participants |
Adverse events
| Event type | EG000 affected / at risk | EG001 affected / at risk |
|---|---|---|
| deaths Total, all-cause mortality | — / — | — / — |
| other Total, other adverse events | 0 / 11 | 0 / 11 |
| serious Total, serious adverse events | 0 / 11 | 0 / 11 |
Outcome results
Primary
Optical Properties of Laminate Veneers
The color of laminate veneers will be performed with a spectrophotometer Vita Easyshade (Vita Zahnfabrik / Bad Saeckingen, Germany) based on Vita and 3D Master scales and on CIEL\*a\* b system. Data collected will be evaluated for translucency parameter (TP) and color difference (ΔE) according the thickness and color of the laminate veneers as well as color of dental substrate. The acceptable threshold color difference for the CIEDE2000 method is 1.8 (Paravina et al, 2015). Greater color variation is desirable when a shade match between darker and lighter adjacent tooth substrates is required and values above the clinical thresholds for acceptability of color differences indicating lower masking ability of the material. Level of Agreement Between the Color Observed by the Operator and the Color Named by the Spectrophotometer was included as a Primary or Secondary Outcome Measure, but data was not collected.
Time frame: after luting the laminate veneers (at least 1 hours after cementation)
Population: 38 ceramic restorations were cemented (25 laminate veneers, 13 crowns; 37 in anterior teeth; 1 in posterior tooth).
| Arm | Measure | Value (MEAN) | Dispersion |
|---|---|---|---|
| Light-cured Resin Cement | Optical Properties of Laminate Veneers | 5.31 Delta E (color change) | Standard Deviation 1.8 |
| Light-cured Flowable Composite | Optical Properties of Laminate Veneers | 5.07 Delta E (color change) | Standard Deviation 2.37 |