Influence of the Number of Layers of a One Bottle Adhesive on the Longevity of Composite Restorations in Primary Molars

Universidade Federal do Rio de Janeiro

Status: Unknown

Conditions: Dental Caries; Secondary Dental Caries

Treatments: Procedure: Three adhesive coats; Procedure: Two adhesive coats

Study type: Interventional

Funder types: Other

Identifiers

NCT01680289

Adhesive1

PRIMEBOND21 (Registry Identifier)

Details and patient eligibility

About

The aim of this study is to determinate the influence of an alternative adhesive application protocol (i.e. consecutive application of an extra adhesive layer)on restoration longevity in primary molars.

Full description

Adhesive systems based on total etch technique remains the most popular products among dental practitioners. These systems are based on the use of an acid conditioner to remove the smear layer and demineralize the enamel and dentin. After the removal of the conditioner by rinsing, a mixture containing the primer and adhesive - i.e. one bottle adhesives - is applicated over the demineralized tissues. The polymerization of the adhesive monomers into microporosities created by acid conditioning forms the structure knowing as hybrid layer or resin-dentin interdifusion zone. A common problem related to total etch technique is the incomplete infiltration of adhesive monomers through demineralized dentin, resulting in the presence of a zone of unprotected collagen fibrils beneath the hybrid layer that is prone to enzymatic degradation. According to some laboratory studies, consecutive application of multiple adhesive coats results in quantitative and qualitative improvements in dental adhesion. In addition to increasing the values of bond strength to dentin, consecutive application of multiple adhesive layers enhances the infiltration of adehesive monomers through demineralized dentin, resulting in a more homogenous hybrid layer.

Enrollment: 60 estimated patients

Sex: All

Ages: 5 to 8 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• Presence of two or more pairs of caries lesions in occlusal or occluso-approximal surfaces of primary molars

Exclusion criteria

• Systemic diseases in which dental treatment is a risk to patient's life
• Bruxism
• Orthodontic appliance
• Absence of occlusal contact in eligible teeth
• Signs and symptoms of pulp infflamation or necrosis

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Factorial Assignment

Masking: Triple Blind

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60 participants in 2 patient groups

Three adhesive coats

Experimental group

Description:

Consecutive application of three one-bottle adhesive coats

Treatment:

Procedure: Two adhesive coats

Two adhesive coats

Active Comparator group

Description:

Consecutive application of two one-bottle adhesive coats

Treatment:

Procedure: Three adhesive coats