Study Of The Change Of Soft And Hard Tissue Of Skeletal Class â…¢ Before And After Orthognathic Surgery Of Bilateral Sagittal Split Ramus Osteotomy

Objective:1. Soft-hard-tissue profiles of the patient with skeletal class Ⅲmalocclusion was measured by cephalometric radiography preoperatively andpostoperatively respectively, to evaluate the result of surgery.2. To detect thedifference of cephalometric radiography between people with normal occlusion andskeletal c1ass Ⅲ patients after bilateral sagittal split ramus osteotomy (BSSRS) inJiangxi province. Meanwhile, it reveals the advantage and disadvantage of thetreatment.3. To compare the cephalometric radiography between people with normalocclusion and skeletal c1ass Ⅲ patients in Jiangxi province, and guide the treatmentof these patients.Methods:1.14patients (6males,8females, an average age of22.8years) withskeletal class Ⅲ malocclusion underwent bilateral sagittal split ramus osteotomyfrom2007to2011in Department of Oral and Maxillofacial Surgery, AffiliatedStomatology Hospital of Nanchang University. Lateral cephalograms were takenpreoperatively and approximately6months postoperatively.2. Soft-hard-tissueprofiles of40class I occlusion candidates (including20females and20males) withnormal profile feature who aged from18to30years was measured bycephalometric radiography.3. The soft-hard-tissue data of lateral cephalograms werecollected from24skeletal class Ⅲ malocclusion patients whose ANB between-2--6°in Jiangxi Province, and was compared with normal people.The value ofsoft-hard-tissue of the normal was analyzed by Winceph8.0cephalometric softwareStatistical calculations were done with the SPSS17.0software. P<0.05was regaredas significant difference.Result:1.19out of27measurements of patients were statistically different beforeand after surgery.respectively：∠SNB、∠ANB、∠SN-GoGn、∠U1-PP、∠L1-MeGo、∠FH-NsTC、Over-jet、Over-bite、B-VR/N-VR、Pog-VR/N-VR、U1-VR/N-VR、L1-VR/N-VR、TUL-VR/N-VR、TLL-VR/N-VR、SB-VR/N-VR、TC-VR/N-VR、TUL-VR/G-VR、TLL-VR/G-VR、SB-VR/G-VR、TC-VR/G-VR、TC-VR/Sn-VR。2.6measurements were demonstrated remarkablely different between the postoperative group and the normal group, respcetively:∠SNA、∠ANB、∠U1-PP、A-VR/N-VR、B-VR/N-VR、Pog-VR/N-VR.The patients whounderwent operation commonly achieved normal profiles.3．Measurements of patientwere statistically different between skeletal class Ⅲ malocclusion and normalpeople.respcetively:∠SNB、∠ANB、∠SN-GoGn、∠U1-PP、∠L1-MeGo、∠FH-NsTC、Over-jet、Over-bite、A-VR/N-VR、B-VR/N-VR、Pog-VR/N-VR、L1-VR/N-VR、TLL-VR/N-VR、SB-VR/N-VR、TC-VR/N-VR、TLL-VR/G-VR、SB-VR/G-VR、TC-VR/G-VR、TC-VR/Sn-VR。Conclusion:1. Skeletal Class Ⅲ patients who underwent BSSRS achievedremarkable changes in sagital profile feature.2. Although skeletal index was notachieved to normal level in skeletal Class Ⅲ patients who BSSRS, their facialappearance changed from Class Ⅲ to Class I due to the compensatory effect of softtissue.3. Compared with normal people, incoordination still not only existed inmandible, maxilla and skull, but also in the soft tissue.