According to Torabinejad 1992, The furthest root from the sinus (7.05mm) is Maxillary

[Dr.Dohaithem]

According to Torabinejad 1992, The furthest root from the sinus among posterior teeth (7.05mm) is Maxillary 1st bicuspid.

[Khaled Balto]

Dr. Dohaithem, what is the source of this info pls?

[Dr.Dohaithem]

This article from the Otolaryngologic Clinics of North America journal pointed out this info, unfortunetly i dont have the full article at this time (i'll upload it as soon as i get it) but you can follow the link below for the abstract.

http://www.ncbi.nlm.nih.gov/sites/entrez?Db=pubmed&Cmd=ShowDetailView&TermToSearch=15064067&log$=activity

[Khaled Balto]

Thanks for the follow up on my question. Perforation of the maxillary sinus during apical surgeries is not frightfull as before....sometimes, during an apical surgery in the upper PMs or Mb root of Uper first molars, we see the lyining of the sinus already after we excute the ostotomy for the surgical access of root tip....we can still avoide perforating them or if the worst happenes...there a management protocol for it.