| Objectives:knowledge and evaluation of the maxillary sinus anatomy before sinusaugmentation are essential for avoiding surgical complications. Posterior superioralveolar artery (PSAA) is the branch of maxillary artery that supplies lateral sinuswall and overlying membrane. The aims of this study were to examine theprevalence, diameter of the bone canal structure of the PSAA, the residual alveolarbone height and the distance of its inferior border from the alveolar crest on conebeam computed tomography (CBCT).methods:CBCT images of maxilla in116patients were randomly selected from patientswho underwent maxillary sinus augmentation procedure and/or posterior teethimplant therapy at the Hospital of Stomatology, Nanchang University in the study.Adult patients met the following inclusion criteria: general healthy is no special; nohistory or presence injury and (or) tumour of maxillary sinus. Female patients whowere pregnant or attempting to get pregnant were also excluded.72patients weremale and44were female patients. Mean age was52.22(rage21to79) years. Therewere177sinuses included in this study, and were97sinuses in the right and80sinuses in the left.61patients were bilateral partially edentulism. Lower border ofthe PSAA (bony canal) to the alveolar crest, diameter of the PSAA (bony canal) andresidual bone height below the sinus floor to the ridge crest (RBH) were measuredfrom CBCT scans. All the recordings were made by two different experimenters andthe data were measured for3times separately by each experimenter.The highest andlowest value were deleted and the average was calculated by the rest4values. Datawas reported using descriptive statistics. Independent t tests were used to determinethe difference between man and woman, and according to left and right, respectively.Results:1. The superior alveolar canal (PSAA) was evaluated in all116patients, and it was identified in75.14%of the cases (133of177sinuses), was all intraosseous/below the schneiderian membrane. There was no canal on the outer cortex of thelateral sinus wall,46.7%was intraosseous canal.2. The mean diameter of the canal was measured0.92±0.29mm.(Rage from0.39to1.77mm,SD0.30mm,median0.97mm) The mean diameter of the canal was1.00±0.30mm in men and0.86±0.26mm in women.54.1%of the canal was <1mm.For right and left sinuses, these values were recorded to be0.97±0.29and0.94±0.31mm, respectively. There was no bone canal＞2mmm.3. Residual alveolar bone height was7.14±3.64mm. Residual alveolar boneheight <10mm, which needed to be produced sinus lift surgery, was82%, and therewere32.3%of sinuses≤5mm,which needed to be produced lateral sinus lift.4. Lower border of the PSAA (bony canal) to the alveolar crest-17.92±5.68mm.(Rage3.38-32.94mm)5. Independent t tests were used to evaluate the difference between men andwomen, and in both right and left sides. There was no statistically significantdifference between the sides of right and left. It was significance smaller in femalethan in male. There was significant correlation between the lower border of thePSAA (bony canal) and the residual alveolar bone height with Pearson correlationrank.Conclusions:1. The results from this study suggested that CBCT is a valuable tool inevaluating presence of the bony canal of the PSAA before maxillary sinus surgery.The great variation on the distance of the canal from the alveolar crest means thatthere was no way to use of mean values for surgical procedures involving the canal.2. Anatomic sides were no statistically significant difference in diameter of thebony canal. But the maxillary alveolar dimension was significant correlation with theRBH. It was significance smaller in females than in males. |
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