Methods: Fifteen cadaver heads(10 males and 5 females) obtained from the college of medicine of Chosun University were examined, with the age at death ranging from 41 to 84 years(median: 53.3 years).
Results: The anterior border of sinus was revealed that 18.75% were located in the canine, 31.25% in the first premolar, 25% in the second premolar, and 25% in the first molar. The posterior border of sinus was that 12.5% were located in the second molar, 31.25% in the mid point between the distal surface of second molar and the maxillary tuberosity, and 56.25% in the maxillary tuberosity region. The prevalence of one or more septa per sinus was found to be 35%. The main location of the septa was the second molar region(44.44%), followed by the first molar region(33.33%) and second premolar region(22.22%). The distance from the floor of nasal cavity to the floor of maxillary sinus varied among +1 and -12.5mm(mean -4.875mm).
Conclusions: To avoid complications during implant placement or sinus floor elevations, a thorough and detailed knowledge of the maxillary sinus is demanded.