Which of the following instruments is commonly used in restorative treatment?

The right angle probe is commonly used in restorative treatment because it serves multiple functions that are crucial during procedures. It is designed to assess the condition of the tooth surface and the surrounding tissues, making it an essential tool for evaluating restoration sites. This instrument can help determine the depth of carious lesions or the presence of margins of existing restorations, which is vital for successful restorative work.

Unlike other instruments that serve more specialized functions, the right angle probe's versatility in guiding the dentist during the assessment phase of restorative treatments is what makes it a frequent choice in practice. It allows dental professionals to gather necessary information to plan and execute restorative procedures effectively, ensuring optimal outcomes for patients.