R adiograph is used as a supporting equipment to strenghen diagnosis. Radiograph interpretation between bonding thieckness and composite filling often misunderstood as secondary caries, thereby dentist break down the restoration the objective of this research is to examine the diferrent effects of dental bonding agent application method taken with periapical radiography, thus creating a good thickness being mistaken as secondary caries. yhis laboratory research used 12 premolar teeth. Proximal box were made in mesial and distal siders of each tooth. the sample was devided into four groups with different treatment. such bonding that applied maxilimally withhout given any air flow (BAI). bonding that applied maximally with given an air flow (BA2), bonding that applied minimally without given any air flow (BB1), and bonding that applied minimally with given an air flow (BB2). Each sample were digitally exposed and there were statistically significant differences between bonding thickness with amount of bonding.