Clinical CBCT Research Of Maxillary Sinus Bone Septa In The Maxillary Sinus Lift

OBJECTIVE: Due to the insufficient bone height on the posterior area of maxillary,the sinus floor lift had to be operated during the dental implantation.By the detailed preoperative CBCT examination,the study aims to analyze the anatomical structure of the septa and the relation to the nearby implants,as well as to research the incidence,location and morphological characteristics of the septa,which help to find the relation between maxillary tooth loss and the septa,and to provide quantifiable implications and clinical data for clinical surgery.METHODS: 124 subjects were selected,taking the CBCT examination before the surgery,each of which were repeated measurements three times,each measurement interval 2d above,by the same researcher on the same computer.Open the coronal,sagittal and axial planes of the selected object files in NNT Viewer software,convert the CBCT scan images to common JPEG format,to observe the position of the sinus septa in the axial plane.Intercept the sagittal plane in the septa and its surrounding structures by the Freecut toolbar of the NNT software,which as a starting point,to measure the height of each plane from the top to the bottom of the septa,to statistics out the proportion,the axial and sagittal plane data of the septa.SPSS software was used for statistical analysis: Chi square test was used to compare the rates,while the Variance analysis was used to compare the mean,P < 0.05 for a significant difference;all tests were two-sided test.Then by the guide of preoperative CBCT,a detailed operation plane was set down.Among the 124 subjects,29 cases had a complete dentition on the maxillary posterior side,the sinus lift + simultaneous implantation surgery were operated in 95 cases,of which,133 implants were placed,including 97 Osstem implants,27 Straumann implants,9 Bicon implants.The available bone height of 61 cases was less than 10 mm but greater than 4mm,while 34 cases were less than 4mm.RESULTS: 33.87%(42/124)cases had sinus septa,27.42%(68/248)sinus had septa.In this study,it was revealed that the septa 66.18%(45/68)were located in the middle region,22.06%(15/68)in the posterior region,11.76%(8/68)in the anterior region.The occurrence of sinus septa had no relation with gender,age and the deficiency of teeth.As a result,68 sinus septa,minimum 3.03 mm,maximum 32.23 mm,the average value(7.53 + 4.46 mm).The average residual bone height of the 95 cases is 5.82 mm,while the average postoperative sinus lifting height is 4.37 mm.The ISQ were measured 1 year after the surgery,90 in maximum,78 in minimum,which implies that all implants were successfully osseointegration.2 case(1.5%)was found marginal bone resorption,by peri-implant rinsing and PERIO injecting 3 times,it was recovered.No peri-implantitis or other abnormality was found.CONCLUSIONS: The observation and measurement of the maxillary sinus septa and its adjacent anatomical structures,which provided by the preoperative CBCT data,could not only enhance the implant success rate,but also reduce intraoperative and postoperative complications in clinical surgery,as well as to provide a detailed reference.It also has a certain significance to make personalized solutions and to improve the treatment effects.