Expanded Function Dental Assistant (EFDA) Board Practice Exam

When refining the margins of dental restorations, a diamond bur is commonly utilized due to its effectiveness and precision. Diamond burs have a unique structure with hard diamond particles embedded in a metal base, making them ideal for cutting, smoothing, and shaping dental materials. They are capable of achieving a very fine finish and are particularly useful in minimizing the risk of overworking the material or damaging the surrounding tooth structure.

The ability of diamond burs to maintain a sharp edge for an extended period also supports their use in achieving well-defined margins. This outcome is crucial in ensuring proper adaptation of restorations to the tooth structure, ultimately enhancing the overall success and longevity of the restoration.