CBCT analysis of anatomy of maxillary sinus septa in 987 cases

doi:10.19438/j.cjoms.2024.06.010

Abstract

Abstract: PURPOSE: To measure and analyze the detection rate, position, direction and height of the maxillary sinus septa by CBCT, and to provide reference for guiding lateral wall approach in maxillary sinus floor elevation to reduce mucosal perforation. METHODS: A total of 987 patients who underwent implant surgery at Ruijin Hospital, Shanghai Jiao Tong University School of Medicine from January 2020 to February 2022 were selected and the maxillary sinus septa in bilateral maxillary sinuses were observed and measured on CBCT. According to the relationship between the maxillary sinus septa and the maxillary sinus floor, they were divided into 3 types: type Ⅰanterior, type Ⅱ middle, and type Ⅲ posterior. According to the direction of the septa, they were divided into 3 types: transverse position (type 1), coronal position (type 2) and sagittal position (type 3). The distance from the highest point of the bone septa downward to the tangent point of the floor wall was measured. Statistical analysis of the detection rate of maxillary sinus septa, the relationship between the septa and the floor of the maxillary sinus, and the direction of septa in different gender and age groups was performed using SPSS 26.0 software package. RESULTS: In 987 patients with a total of 1 974 maxillary sinuses, 288 (9.18%) had septa, with 154 males and 134 females. There was no significant difference in septa detection rate between males and females (P>0.05). A total of 116 were detected in the young population, 110 in the middle-aged population, and 62 in the elderly population. The total septa detection rate in the elderly group was significantly lower than that in the middle-aged group and young group(P=0.000), and the single-side septa detection rate in the elderly group was lower than that in the young group(P=0.005). A total of 348 maxillary sinus spacer heights were measured, and the mean height was (6.63±2.75) mm. There were 7 spacers in typeⅠ(2.01%), 211 in type Ⅱ(60.63%), and 130 in type Ⅲ(37.36%). The average height of typeⅠ interval was (7.94±4.94) mm, type Ⅱinterval was (6.75±2.72) mm, and type Ⅲ interval was (6.39±2.72) mm. Among the 348 maxillary sinus spacers, there were 12 spacers of type 1 (3.45%), 302 spacers of type 2 (86.78%) and 34 spacers of type 3 (9.77%). The average height of spacers of type 1 was (9.30±4.12) mm, type 2 was (6.47±2.62) mm and type 3 was (7.27±3.01) mm. The average height of maxillary sinus interval was (6.89±2.94) mm in males and (6.32±2.49) mm in females. The average height of maxillary sinus interval was (6.40±2.70) mm in young people, (6.69±2.60) mm in middle-aged people and (6.99±3.07) mm in elderly people. There was no significant differences in the height of maxillary sinus interval among different gender, age, location and direction(P<0.05). CONCLUSIONS: Maxillary sinus septa is a common anatomical structure in the maxillary sinus, in Shanghai area, with a lower detection rate in the elderly compared to the young and middle-aged population. The position relationship between the maxillary sinus septa and the maxillary sinus floor is more common in type Ⅱ, and the direction is more common in type 2. A small portion of the maxillary sinus has double septa and complete septa. The height of the maxillary sinus septa is independent of gender, age, position, and direction.

Key words: Maxillary sinus septa, CBCT, Maxillary sinus floor elevation, Anatomical structure

CLC Number:

R782.1

WU Jiong-rui, CHEN Liang, GAO Yi-ming. CBCT analysis of anatomy of maxillary sinus septa in 987 cases[J]. China Journal of Oral and Maxillofacial Surgery, 2024, 22(6): 578-583.

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