Optical Properties of Light Cured Luting Agent on Laminate Veneer

Study Overview
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Brief Summary
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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
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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.

Official Title
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Randomized Clinical Trial of Light Cured Luting Agents on Laminate Veneers

Conditions
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Optical Properties of Laminate Veneers

Intervention / Treatment
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* Procedure: Laminate veneers luted with light-cured resin cement
* Procedure: Laminate veneers luted with light-cured flowable composite


Participation Criteria
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Eligibility Criteria
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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

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

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: Light-cured resin cement<br>Laminate veneers luted using light-cured resin cement | Procedure: Laminate veneers luted with light-cured resin cement<br>* 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.<br>|
| Active Comparator: Light-cured flowable composite<br>Laminate veneers luted using light-cured flowable composite | Procedure: Laminate veneers luted with light-cured flowable composite<br>* 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.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| 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. | after luting the laminate veneers (at least 1 hours after cementation) | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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laminate veneers, luting agent