Which of the following is NOT a factor to consider for facilitating impression making?

When considering factors that facilitate impression making, the focus is typically on aspects that directly impact the quality of the impression and how well it captures the necessary details of the preparation. The use of retraction cord is a common practice as it helps manage the gingival tissue, ensuring that the impression material adequately captures the tooth structure without interference from soft tissue. Ensuring proper proximal clearance is also vital as it allows for a more accurate relationship between adjacent teeth and reduces the risk of trapping soft tissue or creating voids in the impression.

Using a higher viscosity material can also be advantageous in certain situations, as it may provide better stability during the impression process, particularly in areas with less detail or where there is a need for material to stay in place longer.

On the other hand, starting the preparation by guiding grooves may not necessarily influence the impression-making process directly. While guiding grooves help in the efficiency of tooth preparation and may improve the overall outcome of the restoration, they do not directly facilitate the process of capturing an accurate impression. Therefore, this option stands out as not being a crucial factor in the context of impression making, making it the correct response in this scenario.