Final answer:
In an INLAY Class II preparation, it is generally expected to have all walls visible to ensure a well-fitted restoration; however, complete visibility may not always be possible.
Step-by-step explanation:
When performing an INLAY Class II preparation, it is generally expected to have all of the walls of the preparation visible. This visibility is crucial for the fabrication of an inlay that will precisely fit the cavity. However, depending on the extent of decay, tooth morphology, or access issues, complete visibility may not always be achievable. If complete visibility of all walls cannot be achieved, modifications to the preparation or the use of different restorative techniques should be considered. In dental practices, being able to visualize and access the entire prepared cavity facilitates proper assessment of the margins, ensures adequate removal of carious tissue, and aids in achieving a well-fitting final restoration.
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