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Objective To deal with measurements of the relative convexity, to observe the morphological characteristics of zygoma and zygomatic arch, and to provide references for anthropology and medical science. Methods 108 dry skulls (62 male and 46 female) from Wuhan University Medical School were used, the zygomatic relative convexity of both sides were measured, and the morphological characteristics were observed in this study. Results Zygomatic process point lied in the middle of zygoma in horizontal direction, and situated 15-20 mm below the external middle 1/3 of infra-orbital margin. The zygomatic arch was anterolateral convexity, and face width in male was bigger than that in female. Conclusion The relative convexity and morphological characteristics of zygoma and zygomatic arch provide
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Objective The main goals of orthognathic surgery are to achieve funetional occlusion and improve patient's profile.The unintended nasal change in association with anterior maxillary osteotomy is always a challenging.The purpose of this study was to improve the anterior maxillary segmental osteotomy resulting in less post-operative unintended nasal change.Methods Thirty-two patients with maxillary protrusion underwent modified anterior subapical maxillary osteotomy.The design of the modified approach was based on the anterior mandibular subapical osteotomy.The horizontal osteotomy connecting the vertical osteotomy lines on both right and left sides was performed inferior to the piriform aperture and 3 mm over the apex.The integrity of piriform aperture was maximally preserved.Lateral cephalograms,lateral and frontal photographs taken pre-and post-operatively were analyzed.All the patients were followed up for at least 6 months.Results All thirty-two patients were satisfied with esthetic outcome.The upper lip protrusions and tooth exposure improved significantly.Cephalometric and photograph analysis showed that the ratio of upper lip to maxillary ineisor retractionwas 0.64:1.00,and the nasolabial angle and philtrum length were significantly increased(P＜0.05)while vermilion length was decreased.The height of nasal tip and nasal width(alarbase to alarbase)were not significantly changed.Conclusion The modified anterior subapical maxillary osteotomy is a simple procedure leading to no significant postoperative nasal change.It provides a promising alternative in the treatment of maxillary protrusion.
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Objective To generalize a valuable classification of mandibular condyle fractures and explore proper measures for such kind of fractures so as to provide reference for clinical treatment. Methods The data of 304 cases with 358 mandibular condyle fractures were analyzed retrospectively. After one year of the initial treatment, X-ray inspection was employed to get the information including mouth opening, pattern of mouth opening, occlusion, facial symmetry and healing condition of mandibular condyles. Results According to classification of position,displacement and age (PDA), 180 mandibular condyle fractures belonged to type Ⅰ, 96 to type Ⅱ and 82 to type Ⅲ, which coincided with the different fractures treated surgically or nonsurgically. All surgical and nonsurgical treatments got satisfactory outcome. Conclusion The classification of PDA is effective in guiding the treatment choice for mandibular condyle fractures. Both surgical and nonsurgical treatment can obtain effective results for corresponding case.
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Objective Developmental mandibular asymmetry is a common deformity in the human craniofacial skeleton and the treatment is not easy to get satisfactory results. A retrospective study was performed to investigate the clinical results and stability after treatment of developmental mandibular asymmetry by using combination of orthognathic surgery with orthodontics. Methods 58 cases of developmental mandibular asymmetry were treated by preoperative orthodontics-orthognathic surgery -postoperative orthodontics procedure. 82 times of operation, such as mandibular osteotomy, bimaxillary osteotomy, jaw plastic surgery, genioplasty, and distraction osteogenesis were performed according to different type of asymmetry. The facial appearance and occlusion relationship were evaluated with 1～4 years of follow-up. Results Satisfactory results were achieved in 53 cases (91.4 %). Primary satisfactory results were obtained in 4 cases (6.9 %). 1 case (1.7 %) with unsatisfactory result obtained aesthetic effect and ideal occlusion after operation again. Conclusions It is essential to use both of orthodontics and orthognathic surgery in order to ameliorate facial appearance, resume occlusal function, achieve good corrective result and prevent the recurrence of the developmental mandibular asymmetry.
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X-ray cephalometry was used to analyze craniofacial morphology in 32 males and 23 females with operated cleft palate. They underwent primary palatoplasty at the ages of 4 to 7 years and examination at the age of 18 to 25 years old. The cephalometric data were compared with that of the native Hubei adults with normal occlusions. The results indicated the cranial base in the cleft group was morphologically similar to that of the normal controls, there were a decreased angle of skeletal facial convexity, a shorter maxilla, an increased gonial angle and a more open mandibular plane angle in the clefts. All of these differences were significant. Surgical treatments at the age of 4 to 7 years old could cause craniofacial deformities at adults.
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Objective:To investigate the variation of nm23-H1 gene structure and its expression in oral squamous cell carcinoma (OSCC) and to study the relationship between nm23-H1 expression and OSCC metastasis to neck lymph nodes.Methods:nm23-H1 gene in the samples of 30 cases of OSCC,7 of normal oral mucous tissue,human OSCC cell line TSCCa and human oral metastatic cancer cell line GNM was extracted and amplified by PCR. PCR products were investegated with SSCP analysis;nm23 m RNA level in the samples was studied by in situ hybridization.The relationship between mRNA expression and metastasis to neck lymph nodes was analyzed statistically.Results： All samples showed no change in nm23-H1 gene structure except deletion in one case of OSCC;7 out of 9 cases with metastasis to neck lymph nodes showed no hybridization signal of nm23-H1 mRNA,however,only 5 were found no nm23-H1 mRNA in 21 cases without metastasis,positive rate of nm23-H1 expression in GNM cells was lower than that in TSCCa (41.2% versus 63.1%);The expression of nm23-H1 gene showed significant negative relationship with neck lymph nodes metastasis (P<0.01);no relationship was found between expression of nm23-H1 gene and cancer pathological classification.Conclusion:The change of nm23-H1 expression doesn't result from the variation of gene structure;the product of nm23-H1 gene probably inhibit OSCC metastasis to neck lymph nodes.
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objective: To evaluate the clinical effect of various materials used in the reconstruction of mandibular defects retrospectively. Methods: 467 patients with mandibular defects were treated with various implantation materials during last 30 years and 395 of them were followed up.Results: 217 were satisfied with their mouth opening, occlusion and maxillofacial contour after sugery, 189 of them had bone transplanation and 28 had non biomateria transplantaion; 91 were partly satisfied, 72 of them had bone trasplantation and 19 had non biomateria; 87 were not satisfied, 11 of them had bone trasplantation and 76 had non biomaterial. Conclusion: Bone especially auto bone transplantation is more effective than non biomaterial in the reconstruction of mandibular deffects.
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砄bjective:To investigate the variation of nm23 H1 gene structure and its expression in oral squamous cell carcinoma (OSCC) and to study the relationship between nm23 H1 expression and OSCC metastasis to neck lymph nodes.Methods: nm23 H1 gene in the samples of 30 cases of OSCC,7 of normal oral mucous tissue,human OSCC cell line TSCCa and human oral metastatic cancer cell line GNM was extracted and amplified by PCR. PCR products were investegated with SSCP analysis; nm23 m RNA level in the samples was studied by in situ hybridization.The relationship between mRNA expression and metastasis to neck lymph nodes was analyzed statistically.Results: All samples showed no change in nm23 H1 gene structure except deletion in one case of OSCC;7 out of 9 cases with metastasis to neck lymph nodes showed no hybridization signal of nm23 H1 mRNA,however,only 5 were found no nm23 H1 mRNA in 21 cases without metastasis,positive rate of nm23 H1 expression in GNM cells was lower than that in TSCCa (41.2% versus 63.1%);The expression of nm23 H1 gene showed significant negative relationship with neck lymph nodes metastasis ( P
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Objetive:To analyze the fixation methods and sites in treatment of zygomatic complex fractures of 152 patients. Methods:The clinical data of 152 patients from 1990 to 2004 were investigated and analyzed, which focused on the changing trend of etiology and treatment methods. Results:Traffic accident was the primary reason for zygomatic complex fractures in China.152 patients received primary, timely reduction and fixation; Scalp coronal incision in combination with other incisions or alone was applied in 108 patients, the rest were treated by single local incisions. Rigid internal fixation was applied in 123 cases, and the single application of transosseous wire fixation was performed in 22 patients. 328 Ti plates were used. As to the fixation sites, 96 were applied at the zygomatic-frontal suture, 45 plates at zygomatic-maxillary suture and zygomatic crest, 92 plates at zygomatic-temporal suture, and 95 plates across the fracture line. Conclusion:Scalp coronal incision in combination with other incisions or alone can provide satisfactory outcome. Early, timely reduction and rigid internal fixation may result in better treatment results. The sites are focused at zygomatic-frontal suture, zygomatic-maxillary suture and zygomatic crest, zygomatic-temporal suture and the fracture line which restore the horizontal and vertical force route.
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Objective: To observe the postoperative skeletal changes of mandibular setback via bilateral sagittal ramus split osteotomy (BSSRO) with circummandibular wiring and maxillomandibular fixation. Methods: BSSRO was performed in 14 cases to setback the mandible. The patients were followed up for 6 months by clinical observation and examined with lateral cephalometric radiographs and Schuller's position radiographs before and after surgery. Results: According to the measured parameters the ralapse extent was 27.2%. Multiple regression analysis showed the magnitude of the setback significantly accounted for relapse (P