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首页> 外文期刊>American Journal of Orthodontics and Dentofacial Orthopedics >Rapid palatal expansion. Part 2: Dentoskeletal changes in cats with patent versus synostosed midpalatal suture.
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Rapid palatal expansion. Part 2: Dentoskeletal changes in cats with patent versus synostosed midpalatal suture.

机译：pa快速扩张。第2部分：专利的猫与syn骨中肋缝线相比，猫的骨骼骨骼变化。

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Intercanine expansion (C-C) following rapid palatal expansion is made up of sutural displacement (Sd-Sd), tooth tip (Tt-Tt), tooth displacement (Td-Td), and alveolar process tipping and bending (At+b-At+b). The involvement of these four components was studied on 10 rapid palatal expansion treated and two control cats during an active phase (25 days), a retention phase (60 days), and a relapse phase (60 days). The midpalatal suture was analyzed for linear measurements, radiopaque versus radiolucent zones and optical density from occlusal radiographs. Nine treated cats exhibited sutural split and one treated cat showed no split as a result of synostosis of the suture. The contribution of the four constituents [(Sd-Sd):(Tt-Tt):(Td-Td):(At+b-At+b)] to the C-C expansion changed from active to relapse phase from [45%:15%:25%:15%] to [50%:25%:25%:0%] in the animals with sutural split and from [0%:40%:60%:0%] to [0%:0%:100%:0%] in the cat without sutural split, implying the major role of sutural displacement in patent suture, and tooth displacement in synostosed suture. The latter indicates the potential buccal corticalis fenestration, dehiscence or perforation in synostosed suture undergoing RPE. In patent suture (animals with sutural split), optical density increased during rapid palatal expansion (soft tissue build-up) and decreased during retention (remineralization) and relapse phases (medial convergence of the palatal processes). In the animal without sutural split, a continuous decrease in the optical density (predetermined ossification) was found. The progressive six-fold surge in coefficient of variation of C-C expansion during the relapse phase indicates limitation in predicting rapid palatal expansion stability. Clinically, the use of serial occlusal radiographs during rapid palatal expansion is recommended to evaluate patency and extent of retention period.
机译：pa快速扩张后的犬间扩张（CC）由缝合移位（Sd-Sd），齿尖（Tt-Tt），齿移位（Td-Td）和牙槽突尖和弯曲（At + b-At + b）。在活动期（25天），保留期（60天）和复发期（60天）期间，对10只快速pa裂扩张治疗的猫和两只对照猫进行了研究，研究了这四种成分的参与情况。分析pal中缝线的线性测量，不透射线与射线可透过区域以及咬合片的光密度。由于缝合线的骨突形成，九只治疗的猫表现出缝合分裂，而一只治疗的猫未表现出分裂。四种成分[（Sd-Sd）:( Tt-Tt）:( Td-Td）:( At + b-At + b）]对CC扩展的作用从活动阶段变为复发阶段，从[45％： 15％：25％：15％]到[50％：25％：25％：0％]的动物，从[0％：40％：60％：0％]到[0％：0 ％：100％：0％]在没有缝合线缝隙的猫中，这意味着缝合线移位在专利缝合线中有重要作用，而牙齿移位在骨膜缝合线中。后者表明在进行RPE的滑膜缝合中潜在的颊皮质开窗，开裂或穿孔。在专利缝合线（具有缝隙分裂的动物）中，光密度在快速pa扩展（软组织堆积）期间增加，而在保留（再矿化）和复发阶段（media过程的中间会聚）期间降低。在没有缝合分裂的动物中，发现光密度连续下降（预定的骨化）。在复发阶段，C-C扩张的变化系数逐渐增加六倍，这表明在预测快速pa扩张的稳定性方面存在局限性。在临床上，建议在快速lat扩展期间使用连续咬合X光片以评估通畅性和保留期的程度。

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