INTRAORAL DENTAL RADIOGRAPHIC SYSTEMS

Subpart 1. Applicability. This part applies to intraoral dental radiographic systems. The dental intraoral x-ray systems must meet the requirements of: A. nationally recognized standards such as Code of Federal Regulations, title 21, sections 1020.31 to 1020.33; B. the manufacturer's specification; or C. part 4732.1100 . Subp. 2. Safety controls. The registrant must ensure that the safety controls in this subpart are followed. A. Intraoral film holders and bite blocks must be used except when endodontic procedures do not permit. B. Film must not be routinely held by hand. C. The tube housing and the position-indicating device must not be hand-held during an exposure and must be stable before the exposure is initiated and during the exposure. D. The exposure at the end of the cone for a posterior bitewing technique must not exceed the values listed in the table below: kVp "D" Speed Film ESE (milliroentgens) "E," D/E, or E+ Speed Film ESE (milliroentgens) 50 425 - 575 220 - 320 55 350 - 500 190 - 270 60 310 - 440 165 - 230 65 270 - 400 140 - 200 70 240 - 350 120 - 170 75 170 - 260 100 - 140 80 150 - 230 90 - 120 85 130 - 200 80 - 105 90 120 - 180 70 - 90 95 110 - 160 60 - 80 100 100 - 140 50 - 70 (1) exposures are specified as free-in-air exposures without backscatter; and (2) the indicated kVp is often significantly different from the actual kVp. The kVp must be tested at the time the output per film is measured to determine the correct exposure range to be applied. E. The operator of the radiographic equipment must be protected and able to view the patient during the taking of any radiographs. Subp. 3. Beam quality half-value layer. The requirements for half-value layer found in part 4732.0800 , subpart 6, must be met. Subp. 4. Digital radiography. In addition to the requirements of this part, the exposure at the end of the cone of digital dental radiographic equipment must not exceed 120 mR for a posterior bitewing. Subp. 5. Records. Dental facilities must maintain records according to part 4732.0330 until the inspection by the commissioner.