| Objective Cone-beam computed tomography(CBCT)was used to compare the size of the sella turcica between the patients with maxillary palatal impacted canine and normal eruption of the maxillary canine,as well as the incidence of sella shape,sella turcica bridge,ponticulus posticus,posterior arch deficiency and occpitalization of the atlas.And study the correlation between maxillary palatal impacted canine and the occurrence of sella turcica bridge and atlas skeletal abnormalities.Methods 117 patients with maxillary palatal impacted canine who were treated in the Department of Orthodontics at the Affiliated Stomatological Hospital of Chongqing Medical University were selected as the experimental group,and 200 patients with normal eruption of maxillary canine were selected as the control group.Sella turcica length,depth and diameter were measured on the median sagittal plane which generated by CBCT images combined with Mimics(20.0),and record the shapes of the sella turcica(flat,oval,round)and sella turcica bridge types(no sella turcica bridge,partial sella turcica bridge,complete sella turcica bridge).Observing the ponticulus posticus types(type 1,type 2,type 3,type 4),atlas posterior arch deficiency types(type A,type B,type C,type D,type E)and types of atlas occpitalization(type 1,type 2,type 3,type 4)through the sagittal,coronal,cross-section planes and image of three-dimensional reconstruction of CBCT.SPSS 21.0 were used to perform statistical analysis on the above data.Results The length of the sella turcica of patients with palatal impacted maxillary canine was significantly reduced than that of patients with normal eruption of maxillary canine(P=0.00),but the depth and diameter of the sella turcica were not significantly different from those of the control group(P>0.05).The depth of the sella turcica of male in the experimental group was significantly reduced than that of female(P=0.02).There was no gender difference in the length and diameter of the sella turcica in the experimental group(P>0.05).There was also no gender difference in the length,depth and diameter of the sella turcica in the control group(P>0.05).The proportion of sella turcica shape in the experimental group from most to least was flat(45.30%),oval(31.62%)and round(23.08%),and the proportion of sella turcica shape in the control group from most to least was flat(49.00%),oval(29.00%),round(22.00%).There was no significant difference between the two groups in sella turcica shape(P>0.05),and no gender differences were found within both the two groups(P>0.05).The incidence of sella turcica bridge in the experimental group(36.75%)was significantly higher than that in the control group(16.00%),and the difference was statistically significant(P=0.00).Among them,the incidence of partial sella turcica bridge in the experimental group(35.90%)was significantly higher than that of the control group(16.00%),and the difference was statistically significant(P=0.00).There were no gender differences in the incidence of difference types of sella turcica bridge within the two groups(P>0.05).The incidence of ponticulus posticus in the experimental group(35.04%)was significantly higher than that in the control group(22.50%),and the difference was statistically significant(P=0.01).The incidence of unilateral and bilateral ponticulus posticus between the experimental group and the control group was not statistically significant(P>0.05).The incidence of ponticulus posticus in the experimental group was significantly higher in male(54.17%)than in female(21.74%),and the difference was statistically significant(P=0.00),while there was no gender difference in the control group(P>0.05).The incidence of ponticulus posticus types 2+2,1+2,1+3,and 2+4 of male patients in the experimental group were 12.50%,14.58%,8.33%,and8.33%,respectively,which were higher than that of the control group(6.90%,6.90%,2.80% and 2.80%),but the difference was not statistically significant(P>0.05).Both the two groups did not find the atlas posterior arch deficiency types B,C,D or E.The incidence of posterior arch deficiency type A in the experimental group and the control group was4.08% and 3.50%,respectively,and there was no significant statistical difference(P>0.05).No gender differences were found in the incidence of posterior arch deficiency type A within the two groups(P>0.05).Only atlas occpitalization type 2 was found both in the experimental group and the control group,and the incidence was 2.72% and 2.50%,respectively.There was no significant statistical difference(P>0.05)between two groups and no gender differences(P>0.05)were found within the two groups.Conclusion The length of the sella turcica in patients with palatal impacted maxillary canine was significantly shorter than that of normal eruption of maxillary canines.The incidence of sella turcica bridge and ponticulus posticus in the experimental group were significantly higher than those in the control group.In the patients with palatal impacted maxillary canine,the depth of the sella turcica in male was significantly reduced than that in female and the incidence of ponticulus posticus is also higher in male.There is no obvious correlation between the maxillary palatal impacted canine and the depth of the sella turcica,the diameter of the sella turcica,the shape of the sella turcica,the posterior arch deficiency of the atlas and the occpitalization of the atlas. |
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