The Study Of Palatal Bone Thickness In Adults With Different Skeletal Patterns Using Cone-Beam Computed Tomography

Objective : The thicknesses of the palatal bone were measured with cone-beam computed tomography.The difference of the thicknesses in adults with different sagittal skeletal patterns and the difference of the thicknesses in skeletal Class II adults with different vertical skeletal patterns were analysed to provide the clinical reference for palatal implant anchorage insertion.Methods: 30 skeletal Class ?adults(15 males,15 females),30 skeletal Class II adults(15 males,15 females),and 30 skeletal Class ? adults(15 males,15 females)were selected according to different sagittal skeletal patterns.All of them had the same vertical skeletal patterns of average face type and aged 20 to 35 years before treatment.22 low face type(11 males,11 females),30 average face type(15 males,15 females)and 22 high face type(11 males,11 females)patients with skeletal Class ? were selected according to the different vertical skeletal patterns and aged 20 to 35 years before treatment.The patients above were choosen to collect CBCT data,then the left palatal bone thickness was measured at 27 sites with Dolphin Imaging 11.5software.All data were performed by One-Way Analysis and LSD-t with SPSS22.0,Standard a=0.05,maps of palatal bone thickness distribution were made.Result:1.The palatal bone thickness of adults increased from anterior to posterior in midpalatal suture(P?0.01),and decreased from anterior to posterior in mesial and lateral to midpalatal suture(P?0.01),and decreased from midpalatal suture to lateral area in middle and posterior region(P?0.01).There were no significant differences between the areas of Anterior Medial and Anterior Lateral(P?0.05).2.Significant differences were observed in adults with different sagittal skeletal patterns at the same region of palate(P?0.01).there were significantly lower bone thickness in Class ? than in Class ? and Class ?(P?0.01).It was unobvious differences between Class?and Class?.(P?0.05).3.The safe zones of the palate were located at the postmedian region of midpalatal suture and the anterior region of the paramedian palate in Class I and Class II,and the posterior region of the midpalatal suture in Class ?.4.No significant differences were observed in skeletal Class II adults with different vertical skeletal patterns at the same regions of palate(P?0.05).Conclusion:1.The optimal placement for palatal implant anchorage in adults were located at the postmedian region of midpalatal suture and the anterior region of the paramedian palate.Since the thinnest palatal bone thickness was in Class ? adults at the same region of palate,the palatal implants were more reluctant to damage the basis of nose.We suggested to choose the shorter mini-implants for Class ?.2.The vertical skeletal pattern would not infect palatal bone thickness in skeletal Class II adults.