The objective of this study was to analyze the radiographic density of digital subtraction radiographs after SMART restoration with partial caries removal in primary molars at 6 and 12 months.

In management of deep caries in primary teeth, the partial caries removal approach favored the arrest of dentin carious lesions, reduced cariogenic micro-organisms and the risk of pulp exposure. The carious tissue at the lateral walls of the cavity at the enamel dentin junction (EDJ) was removed by a spoon excavator without carious tissue removal at the pulpal site. After caries removal, restoration using glass ionomer cement (GIC)(GC Fuji IX™GP extra) was completed. Such an approach is called SMART restoration. The serial radiographs of each restoration consisted of three radiographs; immediately after restoration, at the 6-month follow-up and at the 12-month follow-ups. Digital subtraction radiography(DSR) was used to evaluate dentin remineralization following partial caries removal. Image-Pro Plus software was used to evaluate DSR. For evaluating the changes in DSR, areas with increase density show higher radiopacity, whereas areas with decreased density show higher radiolucency. The 6-month and 12-month follow-up radiographs were subtracted from the baseline radiograph.

Inclusion Criteria:

• Presence of teeth with dentinal caries limited to the occlusal and proximal surfaces without clinical signs and symptoms of irreversible pulpitis (spontaneous pain, sinus opening, or abnormal tooth mobility
• The radiographic examination showing dental caries involving not less than half of the dentin without any pathologic findings (external root resorption, internal root resorption, abnormality of root resorption, or radiolucency area at furcation /periapical regions).

Exclusion Criteria:

• Teeth with caries exposure to pulp