According to this survey of Indiana dentists just under 20% are using digital radiography. Click the link for the full article.
Results: One hundred and fifty-two dental practices (51%) responded to the survey. Thirty dental practices (19.7%) used digital radiography in their office. Twenty-two (73%) of the dentists using digital radiography were general practitioners. The number of dentists in a practice was a significant factor in predicting the use of digital radiography