| Objective: The condyle fossa position and morphological characteristics of temporomandibular joint(TMJ)in patients with different occlusal support were observed and discussed by conical bundle CBCT(cone beam computed tomography,CBCT).Methods: From January 2013 to December 2016,84 patients(84 cases)with the same method of collecting images from clinical data were selected as the subjects of the study.The patients were taken from the oral hospital affiliated to Nanjing Medical University from January 2013 to December 2016.The mean age was(69.25 ±7.45)on sagittal images of bilateral temporomandibular joint anterior space,upper space,posterior space,depth and width of articular fossa.The thickness of the roof of the articular fossa and the angle of the articular nodule were measured and analyzed,and the bilateral symmetry of the condyle was evaluated on the coronal image.All the data were analyzed by Stata 14 software.The qualitative data were described by rate or composition ratio,chi-square test or exact probability method were used to compare the data between groups,the measured values of condyle on both sides of the group were compared,and the statistical analysis of paired t test was used.The condylar position and the morphology of articular fossa in patients with different occlusal support types were compared by rank sum test,and the changes of condylar positions in patients with different occlusal support types were statistically analyzed by the exact probability method(P < 0.05).Results: The proportion of male and female were 58.33 and 41.67 respectively,of which 22 cases were type A occlusal support,31 cases were type B occlusal,31 cases were type C occlusal,the ratio was 36.90%,the ratio was 36.90%.The posterior space was 2.23 ±0.79 mm 1.98 ±1.18 mm 3.53 ±0.99 mm respectively.There was no significant difference in the size of left and right articular space(p > 0.05).The posterior space and superior space of the joint decreased significantly(P < 0.05),but the anterior space of the joint had no statistical difference(rank sum test > 0.05).The width and depth of the articular fossa were much larger than that of the group B occlusal support.The difference was statistically significant(P < 0.05),and the thickness of articular fossa roof was much smaller than that of group B occlusal support,which was much larger than that of group A occlusal support(P < 0.05).There was no significant difference in the angle of articular nodule between the three types of occlusal support.The position distribution of condyle in patients with different occlusal support(Fish exact probability method)was statistically different(P < 0.003).The condylar process was mainly located in posterior position in patients with class C occlusal support.The depth,width and thickness of the articular fossa were 5.82 ±1.57 mm and 16.19 ±2.21 mm and 4.13 ±3.19 mm,respectively.The depth and width of the left and right articular fossa were significantly lower than that of the right,and the angle of the articular fossa was 36.44 ±12.14 degrees.The difference was statistically significant(P < 0.05),while the thickness of the top of the left and right side of the joint and the angle of the articular nodule were slightly larger in the left side than in the right side,but there was no significant difference between the two sides.There was no significant difference in sex between male and female in left and right anterior space,superior space,posterior space,depth of articular fossa and the thickness of the top of articular fossa,but the width of left articular fossa in male patients was smaller than that in right side.The difference was statistically significant(P < 0.05).Conclusion: Occlusal support changes due to tooth loss are associated with condylar position and the morphology of the articular fossa... |
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