Final answer:
If your patient has a fenestrated canal, you should use a large or multiple otoblocks when taking ear impressions to ensure a proper seal and accurate impression. The correct answer is D. none of the above
Step-by-step explanation:
If your patient has a fenestrated canal, it means that they have a small hole or opening in their ear canal. When taking ear impressions for such patients, it is important to use a large or multiple otoblocks.
This is because a fenestrated canal can cause the impression material to seep out through the opening, resulting in an incomplete impression. By using a large or multiple otoblocks, you can effectively seal the opening and ensure a proper impression of the ear canal.
Using the normal type of otoblock or the X-type of string would not be sufficient in sealing the fenestrated canal and may lead to an inaccurate impression. Therefore the correct answer is D. none of the above