| Objective Facial bone wall thickness of maxillary anterior teeth were measured by Cone-beam CT,Studying important anatomical factors of implantation in aesthetic zone,in order to provide advises for formulating treatment plan before implantation and surgical procedures in aesthetic zone.To measurement and analysis anatomy of Maxillary canine fossa in different sagittal skeletal patterns patients,in order to provide a reliable support for dental implants.Methods From January 2014 to July 2016,95 patients(52 male and female 43cases),hospitalized at changzhou stomatological hospital of jiangsu province.One、under the three dimensional images of CBCT,the position of 4mm bellow CEJ、mid-root and the position of the apical of facial bone wall thickness of maxillary anterior teeth were observed respectively,in order to analyze anatomical features of facial bone wall in aesthetic zone.Two、Cone-beam computed tomography(CBCT)was used to analyze the anatomic morphology of Maxillary canine fossa in different sagittal skeletal patterns patients;Implants of various dimensions were virtually placed into the maxillary premolars region.The relationships among maxillary canine fossa and implant were analyzed.Results One、The thickness of facial alveolar bone at the position of 4mm bellow CEJ overlying central incisors 、 lateral incisors and canines was(0.90±0.20)mm 、(0.86±0.24)mm、(1.00±0.22)mm respectively.The thickness of facial alveolar bone at the position of mid-root overlying central incisor、lateral incisors and canines was(0.81±0.20)mm、(0.53±0.24)mm、(0.65±0.20)mm respectively.The thickness of facial alveolar bone at the position of apical overlying central incisor 、 lateral incisors and canines was(1.75±0.44)mm、(1.68±0.44)mm、(1.79±0.26)mm respectively.There were significant statistical difference in different sites of the same teeth(P<0.05).The thickness of facial alveolar bone wall was thinnest at mid-root,the next was at the position of 4mm bellow CEJ,And it was thickest at the position of the apical.There were significant statistical difference in same sites of different teeth(P<0.05).The thickness of facial alveolar bone at the position of 4mm bellow CEJ overlying canines was thicker than central incisors and lateral incisors.The thickness of facial alveolar bone at the position of mid-root overlying central incisor was thickest,the next was canines,the last was lateral incisors.The thickness of facial alveolar bone at the position of apical overlying canines was thicker than lateral incisors(P<0.05).There were no significant statistical difference in classes、sides、and genders.Two 、 The depth of the maxillary canine fossa was(4.33±0.73)mm 、(3.77±0.58)mm 、(5.18±0.93)mm in the 1st premolar region of class Ⅰ、 Ⅱ and Ⅲrespectively.The depth of the maxillary canine fossa was(3.20±0.63)mm 、(2.81±0.58)mm 、(3.90±0.79)mm in the 2st premolar region of class Ⅰ、 Ⅱ and Ⅲrespectively.There were no significant statistical difference in genders、sides and loss of tooth.And there were significant statistical difference in three classes(P<0.05).The length of the implants was(10.30±1.70)mm(d=3.3mm)and(8.77±1.58)mm(d=4.1mm)in the 1st premolar region.And(8.09±1.51)mm(d=3.3mm)、(6.69±1.35)mm(d=4.1mm)in the 2nd premolar region in patients with teeth and buccal perforation;the length of the implants was(8.98±1.54)mm(d=3.3mm)and(7.67±1.52)mm(d=4.1mm)in the 1st premolar region and(7.09±1.59)mm(d=3.3mm)and(5.79±1.34)mm(d=4.1mm)in the 2nd premolar region in patients with tooth loss,respectively.There were significant statistical difference in loss of tooth(P<0.05).Conclusion A thin facial alveolar wall of teeth in the anterior maxilla is common.In order to achieve appropriate treatment result,measuring facial bone wall thickness of maxillary anterior teeth by Cone-beam CT,evaluating the effect of surgical treatment,guiding opportunity 、 position and direction of implant implantation,augmenting when necessary were very important.Analyzing of spatial relationships among maxillary canine fossa and implants of different sagittal skeletal patterns patients especially class Ⅲ patients,by using CBCT has important significance in guiding dental implanting. |
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