Vertical interpositional augmentation genioplasty with porous polyethylene

Recent advances in the field of biomatrix porous implant technology has stirred the interest of the oral and maxillofacial surgical community. One such material (Medpor), is a biocompatible, large-pore, high-density polyethylene implant which has proven both experimentally and clinically to fulfil the criterion for maxillofacial reconstructive and aesthetic surgical grafting.     

Medpor与游离真皮脂肪移植修复上颌骨及软组织缺损畸形

目的：寻找一种修复上颌骨及软组织缺损的理想方法。方法：采用Medpor与游离真皮脂肪移植，对不同原因所致的上颌骨及软组织缺损畸形进行整复。结果：临床治疗5例，面部畸形均得到良好矫正。结论：这一手术方法创伤小，可塑性强，且大大降低了软组织移植吸收、坏死等并发症的发生，是修复上颌骨及软组织缺损的可取方法。     

颞浅筋膜瓣包裹高密度聚乙烯-肋软骨复合支架一期耳廓再造术

目的探寻耳廓再造的良好手术方法。方法将高密度聚乙烯耳基架与肋软骨外耳轮形成复合支架，支架采用颞浅筋膜瓣包裹，颞浅筋膜瓣的表面采用邻近皮瓣和皮片覆盖，完成耳廓再造。结果自2000年1月至2003年8月利用该方法对8例先天性小耳进行耳廓再造术效果良好。结论通过该方法行耳廓再造，具备良好的外形和一定的弹性，外观逼真，手感良好。     

Medpor义眼座置入同期放置钛钉治疗眼眶凹陷畸形

目的探讨Medpor义眼座植入同期放置钛钉治疗眼球摘除术后眼眶凹陷畸形的有效性和可行性。方法眼球摘除同期置入Medpor义眼座患者80例，随机分为钛钉Ⅰ期置入组和Ⅱ期置入组，每组各40例。比较两组患者术中、术后出现的并发症和患者对义眼活动度和外观的满意程度。结果40例Ⅰ期置入患者术中有37例在术后2～6周时钛钉尾端自发性暴露，只有3例患者需要剪开结膜使钛钉尾端暴露。术后出现并发症者共37例，占46％：其中Ⅰ期置入组17例，Ⅱ期置入组加例，两者差异无统计学意义（P=0．501）。所有患者对其外观和活动度满意，其中Ⅰ期置入组非常满意36例，比较满意4例；Ⅱ期置入组非常满意34例，比较满意6例，两者差异无统计学意义（P=0．502）。结论Medpor义眼座置入同期放置钛钉治疗眼球摘除术后眼眶凹陷畸形，是一种安全有效的手术方法，同时患者避免了再次手术的痛苦。     

Porous Polyethylene Implants for Nasal Reconstruction: Clinical and Histologic Studies

This paper describes a technique of using Medpor porous high-density polyethylene implants for nasal reconstruction and chin augmentation. This biocompatible material has been used successfully during the last decade for various applications in the reconstruction of the facial skeleton. Among its most frequent uses are repair of the orbital floor and reconstruction of the burned ear, which became standard methods at many centers. Relatively little experience is, at present, on hand concerning the use of porous polyethylene in reconstruction of the nasal framework. Twenty-three consecutive, difficult nasal reconstructions were performed using this method since 1996. Patients were followed up for from 1 to 3 years (mean, 2 years). The results were durable and stable over the time. Eight patients had saddle nose deformity and 15 had catastrophe noses, mostly referrals, previously operated on from one to four times. My aesthetic goals were correction of the depressed nasal dorsum, creation of an acceptable nasal dorsum in the thick and/or twisted noses, and tip elevation. For nasal applications Medpor is available as a strut or sheet. Its body, once implanted, becomes rapidly vascularized and both soft tissue ingrowth and collagen deposition occur. This was confirmed by the microscopic investigation of biopsies. One patient of Vietnamese origin had an aesthetically pleasing result, but her family refused to accept her westernized nose. This gave me a unique opportunity to study the whole Medpor implant 6 months after implantation. There were two complications, one small implant exposure and one low-virulent infection involving the nasal tip. Following revision and antibiotic treatment, both patients healed without sequel. All reconstructions were successful in restoring nasal aesthetics and function. Four patients underwent chin augmentations with an uneventful clinical course.     

Medpor与膨体聚四氟乙烯在耳廓和外耳道一期重建术中的应用

目的：探索先天性小耳并外耳道闭锁行耳廓和中耳一期成形术的效果。方法：对6例（耳）采用Medpor聚乙烯材料作为对耳轮支架，膨体聚四氟乙烯（PTFE）作为耳轮支架，一期进行耳廓，外耳道，中耳成形。结果：术后随访8-23个月，听力平均提高28dB，耳廓外观满意，无再狭窄或闭锁。结论：Medpor作为对耳轮支架，PTFE作为耳轮支架，一期进行耳廓，外耳道，中耳成形，可以达到满意的术后效果。     

儿童Medpor支架植入全耳再造改良成形术

目的：应用Medpor支架植入一期行儿童全耳再造术,以期获得更好耳廓的形态手术方式.方法：内含颞浅动脉的颞浅筋膜覆盖Medpor耳支架材料,耳背用残耳皮瓣覆盖,耳正面用全厚皮片覆盖,残耳下1/3修整为耳垂一期再造全耳.结果：2002年～2004年以该方法共完成11例全耳再造术,11例再造耳全部存活,与前期手术相比,再造耳廓结构清晰,形态更加逼真,耳颅角及耳轴线良好.结论：本改良手术能够一期完成全耳再造,再造耳形态逼真,易于存活,是一种理想的儿童全耳再造的手术方式.     

Medpor假体修复下颌角截骨术后下颌角部分缺失畸形

目的:不恰当的下颌角截骨术或者截骨过多会造成下颌角部分缺失畸形,本文选择了一组下颌角截骨术后下颌角部分缺失患者,来研究Medpor假体修复下颌角截骨术后下颌角部分缺失畸形的效果方法:选择本科室3年来5例下颌角截骨术后下颌角部分缺失患者,完善术前检查与分析。在全麻下应用Medpor假体矫治并用钛钉进行固定。术后观察治疗效果,并在6个月后对所有患者进行随访,调查患者满意度。结果:所有5例患者矫治后Ⅰ期愈合,所有患者两下颌角间宽度增加,侧面观下颌角线条自然清晰,恢复了下颌角的正常美学标准。6个月后随访,所有患者均对治疗效果表示满意结论:应用Medpor假体矫治并用钛钉进行固定,可有效地修复因下颌角截骨术后所造成的下颌角部分缺失,使患者下颌角达到一个理想的美学标准。     

应用多孔高密度聚乙烯支架行儿童全耳再造术

目的总结20例儿童应用多孔高密度聚乙烯(Medpor)支架全耳再造术的经验,以利于提高此项手术效果。方法2000~2004年,应用该支架施行全耳再造术20例,其中左侧6例,右侧14例。残耳大小1 cm×1 cm~6.3 cm×2.0 cm。Ⅰ期再造11例(Medpor支架置入、颞浅筋膜瓣与残耳皮瓣转移加全厚皮片移植);Ⅱ期再造9例(其中耳后皮瓣扩张法2例,Ⅰ期残耳旷置、Medpor支架置入、颞浅筋膜瓣转移加全厚皮片移植,Ⅱ期耳垂、耳屏成形7例)。结果Ⅰ期愈合17例,延迟愈合3例,Ⅱ期修复5例,取出支架1例。20例中19例获随访,随访时间3月至3年。再造耳大小5.3 cm×3.2 cm~7.2 cm×5.2 cm,与健耳无明显差别;再造耳解剖轮廓显现较好,但质地稍偏硬,耳屏或耳垂需不同程度的修整。结论应用Medpor支架具有以下主要优点:⑴不造成其他部位的创伤;⑵手术时间缩短;⑶支架可与局部组织融合并稳妥固定;⑷支架无变形或吸收,组织排斥现象较少;⑸术后及随访显示,再造耳轮廓较为清晰、美观。该支架仍是目前儿童行全耳再造术较适宜的人工支架材料。