| Objective By analyzing the cone-beam CT of the bone mass around the alveolar ridge with different heights of the maxillary sinus floor,it provides a targeted reference for the clinician to select the implant site of the anchorage in the alveolar ridge area.Methods Forty of data on dental CBCT examinations were selected between the ages of 18 and 35.CT data was read using CS 3D Imaging Software 3.1.9(Carestream Health,USA)software,and three different sections(cross section,coronal plane,sagittal plane)were adjusted to show the coronal plane of the upper jaws 6,7.The specific measurement methods are as follows:(1)Grouping basis: According to the relationship between the maxillary 6,7 apex and maxillary sinus floor in the coronal plane,it is divided into 1 sinus floor type I group(sinus floor and root tip are not in contact),2 sinus floor II Type group(sinus floor and root tip contact),3sinus floor type III(sinus floor and root tip crossing).(2)Set up each measurement plane: 1reference plane,two lines of the crown-shaped cheek apex of the maxillary molar,2 planned plane: 15 mm,17mm above the reference plane,3 apical planes: maxillary molars parallel to the reference plane The plane of the buccal apex lies.(3)The amount of bone to be implanted into the buccal side of the plane: the thickness of the upper jaw 6 proximal buccal root,the upper jaw 6 distal cheek root and the upper jaw 7 near the buccal root and buccal bone.(4)apical plane cheek bone mass: measure the thickness of the buccal bone of the maxillary 6near the buccal root,the maxillary 6 distal buccal root and the maxillary 7 near the buccal root tip.(5)On the outside of 6MB,6DB,and 7MB,the implants of the alveolar ridges were simulated from the pseudo-implantation planes at a 60-degree angle with the reference plane,and the linear distance from the implant points to the maxillary sinus floor was obtained.Recorded as the intended implant length L.All data were statistically processed using SPSS 22.0 software.Differences between the different sinus types and the planned buccal bone mass of the plane and apical plane,and the difference in the length of the implant(L)were evaluated by independent sample t test(p<0.05);under the same type of sinus floor,the difference of 6MB,6DB and 7MB in the maxillary plane,the difference in the bone surface of the apical plane,and the difference in the length of the implant(L)were evaluated by the paired sample t test.<0.05).Results There was no significant difference in the bone mass between the measurement plane and the buccal side of the apical plane(p>0.05).In the sinus floor I and II,the maxillary 6 near the buccal root and the maxillary 7 near the buccal root There was a significant difference(p<0.05)between the buccal bone thickness and the intended implantation length of each measurement plane.In the type I relationship of the maxillary sinus,the estimated implantation length at the measurement site was 6MB(6.06 ± 3.59)and 7MB(7.85 ± 2.12),and the difference between 6DB(6.20 ± 3.47)and 7MB(7.85 ± 2.12)was statistically available.Academic significance(p<0.05).At the sinus floor type II relationship,the difference between only 6MB(3.39±1.54)and 7MB(4.83±2.88)was statistically significant(p<0.05).Conclusion(1)Under different heights of the maxillary sinus floor,there is no significant difference in the amount of buccal bone between the maxillary first molar near the buccal root,the distal buccal root,and the second molar near the buccal root,while the maxillary There was a significant difference in the distribution of the gingival crest bones near the buccal root of the buccal root,the distal cheek root and the maxillary second molar.(2)At the same height of the maxillary sinus floor,the buccal bone of the maxillary second molar is significantly larger than that of the maxillary first molar near the buccal root.The maxillary second molar is closer to the upper molar than the maxillary first molar.The amount of the sacral alveolar bone outside the buccal root is also significantly more. |
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