Optical Properties of Light Cured Luting Agent on Laminate Veneer

Not Applicable

Completed

Interventions: Procedure: Laminate veneers luted with light-cured resin cement
Procedure: Laminate veneers luted with light-cured flowable composite

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.

Recruitment & Eligibility

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

Arm && Interventions

Group	Intervention	Description
Light-cured resin cement	Laminate veneers luted with light-cured resin cement	Laminate veneers luted using light-cured resin cement
Light-cured flowable composite	Laminate veneers luted with light-cured flowable composite	Laminate veneers luted using light-cured flowable composite

Primary Outcome Measures

Name	Time	Method
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.

Secondary Outcome Measures