The teeth allocated in the conventional restoration group (control) will receive restorations in resin composed by incremental technique, using opaque resin. For this, 37% phosphoric acid (Condac37, FGM) will be applied for 15 seconds, and then, after washing and relative drying of the surface, application of universal adhesive (Universal Beautibond Adhesive, Shofu) with the aid of microbrush on the entire dental surface, photoactivation of the adhesive and restoration by incremental technique and photoactivation of each layer of resin for 20 seconds. The tooth will receive finishing and polishing through rotating instruments and abrasive discs (Supersnap, Shofu).

The teeth allocated in the experimental group will have the restorations carried out through monochromatic composite resin with chameleon effect in single insertion through polyvinyl crown. For this, 37% phosphoric acid (Condac37, FGM) will be applied for 15 seconds, and then, after washing and relative drying of the surface, application of universal adhesive (Universal Beautibond Adhesive, Shofu) with the aid of microbrush on the entire tooth surface, photoactivation of the adhesive and adaptation of the crown matrix in acetate filled with resin in the tooth. Photoactivation will be done for 20 seconds per dental face, and the acetate matrix is then removed. The tooth will receive finishing and polishing through rotating instruments and abrasive discs (Supersnap, Shofu).

Restorative treatment of anterior primary teeth with monochromatic composite resin in single insertion through polyvinyl crowns, after selective removal of carious tissue compared to the effectiveness of conventional restoration.

The integrity of the restoration, its adaptation in all dental faces and identified possible failures related to structural fracture, resin wear, maladaptation or functional maintenance of the restored tooth will be verified.

The clinical evaluation of the retention of the restorations will be performed after 6, 12, 18 and 24 months, using the criteria: total retention; Partial retention 1 - presence of the resin in two thirds of the surface of each dental face; Partial retention 2 - presence of the resin in one third d and each face of the dental surface, total loss of resin on the surface of the dental surface.

It will also be evaluated the degree of tooth mobility and its relationship with the usual exfoliation period in the teeth belonging to both groups. In teeth where the restoration is intact and clinical features of associated lesions are not verified, the lesions will be considered as inactive.

For the evaluation of caries progression, the modified periapical radiographic examination for preschoolers will be used. The images will be compared two by two in order to evaluate whether or not there was progression of caries:

1. Absent progression: when there is no increase in the radiolucent area of the lesion.
2. Progression present: when there is an increase in the radiolucent area of the lesion.

Teeth that present progression of caries lesion to signs of pulp involvement, will receive restorative or endodontic treatment compatible with the observed picture.