Final answer:
The correct statement about surgical stents is that they serve as a guide positioned over the alveolar ridge to help in proper placement of dental implants. They are an important tool during dental surgery but are not used to hold the mouth open or fit under crowns.
Step-by-step explanation:
The correct statement about surgical stents is: A. It will be used as a guide that is positioned over the alveolar ridge to guide placement of the implant screws in their proper position. Surgical stents are typically used during dental implant procedures to ensure accurate placement of the implants in relation to the existing bone structure and adjacent teeth.
They are not used to hold the patient's mouth open during surgery, nor do they fit under the crown and over the root from implant. Also, while a drill bit is used to prepare the alveolus, that is a separate tool and not a stent.