| Objective1.To study the related factors including gender,age and the inclination of maxillary central incisors which influence the upper incisor alveolar thickness using CBCT.42.To investigate the difference on the alveolar bone fenestration and dehiscence occurrence of maxillary central incisors with different inclination as well as the buccal and lingual sides using CBCT.Materials and methods:1.One hundred and one CBCT imagines of patients in The First Affiliated Hospital of Zhengzhou University from January 2018 to January 2019 were randomly selected.The CBCT data of patients including 45 males and 56 females ranging from 12-45 years old with a mean age of(22.2±5.3)years old were imported to the eXamVison software and then the labial and palatal alveolar bone thickness were measuerd.The angle between the long axis of upper incisors and the palatal plane were also recorded.The paients were divded into three groups including lingual-inclined group,normal-inclined group and labial-inclined group according to the inclination of maxillary central incisors.The paients were divded into three groups which includes adolescent group,youth group and adult group according to age.Spss17.0 was used for statistical analysis of the data.One-way analysis of variance and t test was carried out among measurement data of the labial and palatal alveolar bone thickness.LSD-t test was used when differences existed among groups.The correlation of each measurement to gender,age and the inclination of the corresponding central incisor were analyzed via Pearson correlation and multiple linear regression.2.Seventy-nine CBCT imagines of patients in The First Affiliated Hospital of Zhengzhou University from January 2018 to January 2019 were randomly selected.The CBCT data of patients including 30 males and 49 females ranging from 18-45 years old with a mean age of(23.9±4.4)years old were imported to the eXamVison software and then the occurrence of alveolar bone fenestration and dehiscence were detected.The angle between the axis of upper incisors and the palatal plane were also recorded.The paients were divded into three groups including lingual-inclined group,normal-inclined group and labial-inclined group according to the inclination of maxillary central incisors.The incidence of alveolar bone fenestration and dehiscence were analyzed by Fisher's exact probability among different groups.The incidence of alveolar bone fenestration and dehiscence were analyzed by chi-square test between buccal and lingual sides.Results1.(1)There were no significant differences in alveolar bone thickness between the left and right maxillary central insiors(P>0.05).(2)There were no significant differences in B1?B2?B3 and P1 between the sexes(P>0.05).P2 and P3 were significantly higher in the males than females(P<0.05).(3)There were no significant differences in B1?B2?B3 and P2 among different age groups(P>0.05).P1 were significantly higher in the adult group than the adolescent and youth groups(P<0.05).P3 was significantly higher in adult group than in adolescent group(P<0.05).(4)There were no significant differences between B1,B2 and B3(P>0.05).There were significant differences between P1,P2 and P3(P<0.05).P3 was significantly higher than P2 and P1.P2 was significantly higher than P1.The alveolar bone thickness in labial side was significantly higher than palatal side(P<0.05).(5)The values of B3,P1,P2 and P3 were correlated with the inclination of the upper central incisors and the palatal plane(P<0.05),yet without a stronger linear correlation.(6)Age had no significant effect on alveolar bone thickness of maxillary central incisors(P>0.05).Gender had significant effect on P2 and P3(P<0.05).U1-PP had significant effect on palatal alveolar bone thickness(P<0.05).2.(1)There were no significant differences on the incidence of alveolar fenestration and dehiscence among groups(P>0.05).(2)There were significant differences on the incidence of alveolar fenestration and dehiscence between buccal and lingual side(P<0.05).The incidence of alveolar fenestration and dehiscence of maxillary central incisors in the labial side was significantly higher than the palatal side.Conclusion1.(1)There is no difference in alveolar bone thickness between the left and right maxillary central insiors.(2)The labial alveolar bone thickness of maxillary central insors is thinner than the palatal side and the palatal alveolar bone thickness is thicker towards the root tip.For upper incisors needs to move in the anterior-posterior dimension,attention should be paid to the direction and range of tooth movement as well as torque of the root.(3)For female patients with high insor inclination,we should pay attention to the thickness of alveolar bone around the upper central incisor,especially the palatal side,and then estimate the range of tooth movement and choose the treatment method reasonably.2.The effect of incisor inclination on the incidence of fenestration and dehiscence was not significant,and the incidence in the labial side was higher than that in the palatal side.Factors affecting the incidence of fenestration and dehiscence of upper central incisors need to be further studied. |
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