Hi there! Teeth like this can be temporized with using the fiber post as an extension of the temporary in order to get some in track Ronald retention. It will also help you understand is the final crown can be maintained that way since there’s no ferule. Yes, it’s a compromise and involves a lot of trade offs; but as long as the patient understands it’s an attempt at saving the tooth and understands the limitations it’s worth a try. Regarding contamination, it’s easier in this area due to not having salivary flow and staying dry is not an issue. In the mandibilar molar area with the tongue and higher saliva content sometimes it’s better to do a quick build up on the tooth prior to the access. Hope this helps. 🙂