Star group refining World’s most trusted dental refining service Buying crowns from dental offices is made easy with star group’s valuation consultants located throughout the usa and canada. We offer a unique system for on-the-spot valuation and payment for materials right at your own office! Or we offer the traditional fast turnaround mail, refine and pay service–it’s your choice. Either way, you’ll receive up-to-the-minute, top prices for your materials in cash