The Clinical Study Of The Position Relationship Between The Maxillary Sinus Floor And The Maxillary Posterior Teeth Apexes By CBCT

Objective:To provide the references for the diagnoses of diseases in the posterior maxillary regions and the preoperative evaluations of dental implants by observing and analyzing the position relationships between root apexes of maxillary molar teeth and the bottom of maxillary sinus by CBCT.Methods:32 cases which met the inclusion criteria were chosen from the CBCT database of the Department of Stomatology in Shanghai First People’s Hospital.The ExamVision software was applied to observe the classification of the relationship between the posterior maxillary tooth roots and the maxillary sinus floor,and to evaluate the incidence of various types.The vertical distance from the roots apical to the bottom of the maxillary sinus were measured and statistical analysis was carried out.Results:No statistically significant differences were found between the right and left side measurement(P>0.05).In total 32 general population(64sides),the mesiobuccal root of maxillary second molar had the shortest mean vertical distance to the maxillary sinus(P<0.05),and the distance was(1.59±3.44)mm;the root of maxillary second premolar had the longest mean vertical distance to the maxillary sinus(P<0.05),and the distance was(4.94±5.23)mm.Among four types,the most common type was type I(61.16%),type IV accounted for about 20.08% of the total.And type IV(28.13%)occurred most in the palatal apex of first molar.The highest intimate contact rate was measured between the mesiobuccal root of the second molar and the maxillary sinus,which was 46.88%.Conclusion:Posterior maxillary tooth roots have a close relationship with the sinus floor.CBCT can accurately evaluate the anatomy of maxillary posterior region,which has great value for the clinical operation.