Maxillary ameloblastoma. Case report and review of the literature

A case of maxillary ameloblastoma is presented. A non-healing, asymptomatic ulcerative lesion in the maxillary tuberosity region did not respond following relief of physical irritation. The clinical appearance of the lesion was compatible with that of a malignant tumour, but the histopathology was consistent with a diagnosis of ameloblastoma of the maxilla.     

Clinical outcome of 103 consecutive zygomatic implants: a 6-48 months follow-up study

The purpose of this study was to evaluate retrospectively, after a period of 6-48 months follow-up of prosthetic loading, the survival rate of 103 zygomatic implants inserted in 55 totally edentulous severely resorbed upper jaws. Fifty-five consecutive patients, 41 females and 14 males, with severe maxillary bone resorption were rehabilitated by means of a fixed prosthesis supported by either 1 or 2 zygomatic implants, and 2-6 maxillary implants. This retrospective study calculated the success and survival rates at both the prosthetic and implant levels. Out of 55 prostheses, 52 were screwed on top of the implants, while 3 were modified due to loss of standard additional implants and transformed in semimovable prosthesis. Although osseointegration in the zygomatic region is difficult to evaluate, no zygomatic implant was considered fibrously encapsulated and they are still in function. This study confirms that zygoma bone can offer a predictable anchorage and support function for a fixed prosthesis in severely resorbed maxillae.     

Severe unilateral scissor bite and bimaxillary protrusion treated by horseshoe Le Fort I osteotomy combined with mid-alveolar osteotomy

This report describes an orthognathic surgical case employing horseshoe Le Fort I osteotomy (HLFO) combined with mid-alveolar osteotomy and bilateral sagittal split ramus osteotomy (BSSRO) for a patient with severe unilateral scissor bite and bimaxillary protrusion. A female patient (aged 26 years, 2 months) presented with a chief complaint of dysmasesis caused by scissor bite on the right side. The clinical examination revealed difficulty in lip closure and a convex profile. Overerupted right maxillary premolars and molars and lingual tipping of the right mandibular premolars and molars were indicated before treatment. After 3 months of presurgical orthodontic treatment, two-jaw surgery involving a combination of HLFO with mid-alveolar osteotomy and BSSRO was performed. A good interdigitation in the right side was established by superior-posterior-medial movement of the dento-alveolar segment of the maxilla. Next, both the maxilla and mandible were moved superiorly and posteriorly to correct the improper lip protrusion, thereby improving the patient''s profile. Our results suggest that this new orthognathic surgery technique—achieved by combining HLFO with mid-alveolar osteotomy and BSSRO—is effective for adult patients exhibiting severe unilateral scissor bite and bimaxillary protrusion.     

全面部陈旧性骨折16例临床治疗与分析

目的：探讨全面部陈旧性骨折特点及治疗原则,评估本医院治疗措施的效果。方法：回顾分析西安交通大学口腔医院口腔颌面外科自2005年1月～2012年6月诊治的全面部陈旧性骨折16例。术前术后的调查评估内容包括年龄、性别、病因、延误治疗的原因、骨折部位、治疗措施、术后面部畸形、咬合关系、张口度、并发症、复发等内容。结果：所有患者均发生面中份骨折,12例伴有下颌骨骨折,10例伴有额骨骨折,14例伴有颧骨骨折,10例伴鼻眶筛骨折。LeFort I型截骨术应用于所有患者。术后颌间固定、调颌或义齿修复应用于所有患者,4例患者接受正畸治疗,其中3例为扩弓治疗。1例患者术后仍存在眼球内陷,视力障碍。2例患者因软组织缺损,导致面部畸形。所有患者张口度均恢复正常,无明显手术并发症。结论：LeFort I型截骨术与分段截骨术是治疗全面部陈旧性骨折骨的基本方法。对于上颌骨矢状骨折,手术不能完全恢复咬合关系者,术后扩弓是一种有效的方法。术后的辅助治疗是有必要的,包括正畸治疗、义齿修复、调颌等。     

小鼠上下颌骨发育差异性表达基因的生物信息学分析

目的:上、下颌骨的发育差异可能是由于两者差异性地表达某些基因而造成的。本文拟对E9.5(胚胎第9.5天)小鼠上、下颌弓差异性表达的基因进行系统的生物信息学分析。方法:从GEO数据库获取E9.5小鼠上、下颌弓差异性表达的基因,应用DAVID和Gene MANIA数据库分析这些基因之间的相互关系。结果:经过DAVID数据分析,这些在E9.5小鼠上、下颌弓差异性表达的基因被富集到不同的生物学过程或分子功能的子集中,如"转录因子活性"、"系统发育"和"骨骼系统发育"等。其中BTB7B、SOX10、TSHZ2、GSC、GLIS2、MEIS1、CITED2、IRF9、BARX1、MSX1、DLX6、CSRNP1、HEYL、MKX、PITX1和NFIB,这16个基因被富集到"转录因子活性"这一分子功能子集。通过Gene MANIA数据库分析,建立了这16个基因及一些预测基因的分子网络图,显示这些基因存在直接或间接的相互作用。结论:上、下颌骨在发育过程中存在许多差异表达的基因,其中对上、下颌骨特异性发育具有重要调控作用的16个转录因子包括BTB7B、SOX10、TSHZ2、GSC、GLIS2、MEIS1、CITED2、IRF9、BARX1、MSX1、DLX6、CSRNP1、HEYL、MKX、PITX1和NFIB,它们彼此密切相关且相互作用形成调控网络。在研究上、下颌骨差异性发育的分子调控机制时,需要关注由这些基因形成的调控网络。