If the certificate of registration has additional authorized use sites, the registrant shall pay an additional 30% for each additional use location. Box 149347 Austin, TX 78714-9347 Telephone: (737) 218-7110 Fax: (512) 206-3787 Additional Information Rancho Cordova, CA 95742, Toll Free 800-555-6248 A dental assistant may not position or expose dental x-rays unless the dental assistant holds a dental assistant radiology certificate issued by the Texas State Board of Dental Examiners. X-rays are quite safe, and the potential benefits far, Dental X Ray Laws. // Dental X Ray Laws. The Medicare Conditions of Participation (COP) require General Information A dental assistant may not position or expose dental x-rays unless the dental assistant holds a dental assistant radiology registration issued by the Texas State Board of Dental Examiners. Third-party payers must protect all images submitted by dental offices in accordance with applicable HIPAA and state privacy and security regulations. To do this, you can use three basic protective measures in radiation safety: time, distance, and shielding.