UNESP, Araçatuba Dental School, Department of Dental Materials and Prosthodontics, São Paulo 16015-050, Brazil.
J Biomed Opt. 2012 Jun;17(6):061203. doi: 10.1117/1.JBO.17.6.061203.
The use of photoelastic analysis contributes to the rehabilitation of patients with oral-sinus-nasal sequelae, which in turn affect important functions such as chewing, swallowing, and speech. The prosthetic rehabilitation with implant-retained dentures is a suitable treatment option. The purpose of this study was to verify, by using a photoelastic analysis, the stress distribution in implant-retained palatal obturator dentures (relined or not) associated with different attachment systems (O-ring, bar-clip, and bar-clip associated with distally placed O-rings). Two photoelastic models were obtained from an experimental maxillary cast presenting an oral-nasal communication. One model had two 13-mm length implants placed on the left region. A total of eight colorless maxillary obturators were fabricated and subsequently four of them were relined with soft silicone soft, and three had attachment systems associated. The assembly (model/attachment system/prosthesis) was positioned in a circular polariscope and a 100-N load was applied at 10 mm/s. The results showed that the denture relining influenced the distribution and amount of stress on the models. The O-ring group displayed the lowest stress levels, followed by bar-clip system associated with distally placed O-rings and bar-clip groups.
光弹分析有助于口腔鼻窦鼻后遗症患者的康复，而这些后遗症反过来又会影响咀嚼、吞咽和言语等重要功能。植入物保留义齿修复是一种合适的治疗选择。本研究的目的是通过光弹分析验证不同附着系统（O 形环、杆夹和与远置 O 形环相关的杆夹）与腭部阻塞义齿（未衬里或衬里）相关的种植体保留的腭部阻塞义齿的应力分布。从一个具有口腔-鼻腔连通的实验性上颌模型中获得了两个光弹模型。一个模型在左侧区域放置了两个 13 毫米长的种植体。总共制作了 8 个无色上颌阻塞器，其中 4 个用软硅胶软衬里，3 个带有附着系统。将组件（模型/附着系统/义齿）放置在圆偏振光镜中，并以 100-N 的负载以 10mm/s 的速度施加。结果表明，义齿衬里会影响模型上的应力分布和数量。O 形环组显示出最低的应力水平，其次是与远置 O 形环相关的杆夹系统和杆夹组。
