Measuring and Assessing the Zone of Keratinized Tissue Around Potential Implant Sites?

Anon. asks:
I have not been able to find specific guidelines for measuring and assessing the zone of keratinized tissue around potential implant sites. This area of per-operative diagnosis and treatment planning is not as well developed as some other areas. This makes it difficult to treatment plan cases and avoid complications. In courses I have attended various lecturers have recommended doing various grafting procedures to increase the zone of keratinized tissue before the surgical placement, during the surgical placement or after the surgical placement. I have a patient who needs to have the zone of keratinized tissue increased around the mandibular first and second molars. What are the best techniques to do this?