The aim of this randomized, prospective, parallel, double-blind clinical trial will be to evaluate the clinical performance of restorations performed in non-carious cervical lesions (NCCL) using a soft ph universal adhesive system, varying the adhesive strategy (self-etching vs. selective etching of the enamel) and the sclerosis characteristics of the dentinal substrate over 24 months.
Two hundred restorations will be performed in NCCL of volunteers of both genders, by a single operator, using the Single Bond Universal(3M ESPE) adhesive system. The restorations will be randomly allocated into 4 groups (n-50): D-SE (absence of dentinal sclerosis and self-etching protocol); D-SELETIVE (absence of dentinal sclerosis and selective enamel etching protocol); SD-SE (sclerotic dentin and self-etching protocol); SD-SELETIVE (sclerotic dentin and selective enamel etching protocol). The randomization process within subject was performed by computer-generated tables by a staff member not involved in the research protocol. Details of the allocated group were recorded on cards contained in sequentially numbered, opaque, sealed envelopes. These were prepared by a staff member who was not involved in any of the phases of the clinical trial. The allocation assignment was revealed by opening the envelope on the day of the restorative procedure.The operator was not blinded to group assignment when administering. The evaluations of the clinical performance of the restorations will be carried out by two previously calibrated examiners, adopting the criteria of the United States Public Health Service (USPHS) for the variables retention, marginal adaptation, marginal staining and postoperative sensitivity . The intragroup statistical analysis will be performed using the McNemar test for the variables retention and postoperative sensitivity; and by Wilcoxon for adaptation and marginal staining. To compare the clinical performance inter groups in the different assessment intervals, Fisher's exact test (retention and postoperative sensitivity) and Kruskal-Wallis (adaptation and marginal staining) will be used.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
The adhesive system Single Bond Universal (3M Oral Care; Brazil) and a nanoparticulate composite resin Z350 XT (3M Oral Care; Brazil), shade A3B, will be the materials used in the restorative procedures. For the D-SE group, the universal adhesive system will be applied with a disposable microbrush, actively, for 20s and then a gentle stream of air will be used for 5s to solvent evaporation, followed by light curing for 10s using the Valo Cordless light curing (Ultradent Products Inc.), in Standard mode (1000mW /cm2). All groups will receive the restorations made following the incremental technique of insertion of composite resin (2mm per increment), which will be light cured according to the manufacturer's recommendations.
The adhesive system Single Bond Universal (3M Oral Care; Brazil) and a nanoparticulate composite resin Z350 XT (3M Oral Care; Brazil), shade A3B, will be the materials used in the restorative procedures. For the D-SELETIVE group a 37% phosphoric acid will be applied only at the enamel margin for 15s, then rinsed with water for 20s, and slightly dry. The universal adhesive system will be applied with a disposable microbrush, actively, for 20s and then a gentle stream of air will be used for 5s to solvent evaporation, followed by light curing for 10s using the Valo Cordless light curing (Ultradent Products Inc.), in Standard mode (1000mW /cm2). All groups will receive the restorations made following the incremental technique of insertion of composite resin (2mm per increment), which will be light cured according to the manufacturer's recommendations.
Universidade Federal do Pará
Belém, Pará, Brazil
RECRUITINGRetention
The restorations retention will be evaluated according to the criteria established by the United States Public Health Service (USPHS), classifying them in the following scores: Alpha - retained Bravo - partially retained Charlie - restoration lost For evaluation of clinical performance, beta and charlie scores will be considered as failure.
Time frame: 1 year
Retention
The restorations retention will be evaluated according to the criteria established by the United States Public Health Service (USPHS), classifying them in the following scores: Alpha - retained Bravo - partially retained Charlie - restoration lost For evaluation of clinical performance, beta and charlie scores will be considered as failure.
Time frame: 2 years
Marginal adaptation
Marginal adaptation will be evaluated according to the criteria established by the United States Public Health Service (USPHS), classifying them in the following scores: Alpha - Restoration is continuous with existing anatomic form. Bravo - Detectable V-shaped defect in enamel only. Catches explorer going both ways Charlie - Detectable V-shaped defect to dentin-enamel junction
Time frame: 1 year
Marginal adaptation
Marginal adaptation will be evaluated according to the criteria established by the United States Public Health Service (USPHS), classifying them in the following scores: Alpha - Restoration is continuous with existing anatomic form. Bravo - Detectable V-shaped defect in enamel only. Catches explorer going both ways Charlie - Detectable V-shaped defect to dentin-enamel junction
Time frame: 2 years
Marginal staining
Marginal staining will be evaluated according to the criteria established by the United States Public Health Service (USPHS), classifying them in the following scores: Alpha - No discoloration along the margin Bravo - Slight and superficial staining (removable, usually localized). Charlie - Deep staining cannot be polished away
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DOUBLE
Enrollment
50
The adhesive system Single Bond Universal (3M Oral Care; Brazil) and a nanoparticulate composite resin Z350 XT (3M Oral Care; Brazil), shade A3B, will be the materials used in the restorative procedures. For the SD-SE group, the universal adhesive system will be applied with a disposable microbrush, actively, for 20s and then a gentle stream of air will be used for 5s to solvent evaporation, followed by light curing for 10s using the Valo Cordless light curing (Ultradent Products Inc.), in Standard mode (1000mW /cm2). All groups will receive the restorations made following the incremental technique of insertion of composite resin (2mm per increment), which will be light cured according to the manufacturer's recommendations.
The adhesive system Single Bond Universal (3M Oral Care; Brazil) and a nanoparticulate composite resin Z350 XT (3M Oral Care; Brazil), shade A3B, will be the materials used in the restorative procedures. For the SD-SELETIVE group a 37% phosphoric acid will be applied only at the enamel margin for 15s, then rinsed with water for 20s, and slightly dry. The universal adhesive system will be applied with a disposable microbrush, actively, for 20s and then a gentle stream of air will be used for 5s to solvent evaporation, followed by light curing for 10s using the Valo Cordless light curing (Ultradent Products Inc.), in Standard mode (1000mW /cm2). All groups will receive the restorations made following the incremental technique of insertion of composite resin (2mm per increment), which will be light cured according to the manufacturer's recommendations.
Time frame: 1 Year
Marginal staining
Marginal staining will be evaluated according to the criteria established by the United States Public Health Service (USPHS), classifying them in the following scores: Alpha - No discoloration along the margin Bravo - Slight and superficial staining (removable, usually localized). Charlie - Deep staining cannot be polished away
Time frame: 2 Years