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首页> 外文期刊>The Journal of Prosthetic Dentistry >Morphological magnetic resonance imaging study of oral submucosal tissue and buccinator muscle dynamics in the posterior dentition: A clinical study
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Morphological magnetic resonance imaging study of oral submucosal tissue and buccinator muscle dynamics in the posterior dentition: A clinical study

机译：后牙齿口腔粘膜组织和溃疡肌动力学的形态磁共振成像研究：临床研究

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Statement of problem. The relationship between the buccal mucosa-tongue side wall contact points and at what ratio the submucosal tissue (ST) and buccinator muscle (BUC) change during function are unclear.& nbsp; Purpose. The purpose of this clinical study was to clarify the space and dynamics of the ST and BUC in complete denture wearers by using magnetic resonance imaging and to investigate how denture base shape affects space sealing and the relationship between the ST and BUC.& nbsp; Material and methods. Eight edentulous participants wearing maxillary and mandibular complete dentures were enrolled. Wax was added to the buccal border of the dentures, and axial and coronal magnetic resonance imaging scans were made during mandibular rest (MR) to observe the relationship of the buccal mucosa and tongue above the retromolar pads. In addition, on axial images, the thicknesses of the ST and BUC were measured at 3 sites: second molar center, second molar distal (SMD), and retromolar pad center (RPC). Coronal images were made during MR, partial mouth opening, and midmouth opening (MMo). At second molar center, SMD, and RPC, the thicknesses of the ST and BUC were measured at the maxillary buccinator attachment region (point A), the mandibular buccinator attachment region (point B), and the median point between A and B (point M).& nbsp; Results. During MR, contact sealing of the buccal mucosa and tongue on the RPC was noted in 81% of participants. After expanding the denture base with wax, contact was lost in 86% of participants. The ST and BUC thicknesses on the RPC decreased significantly with the addition of wax. During MR, the ST became significantly thicker the further posteriorly it was located. The ST was significantly thicker at point M than at point A for all sections, regardless of mouth opening. The ST and BUC thicknesses in SMD and RPC were significantly thicker at point M than at point B during MR and MMo. The differences of the ST and BUC thicknesses depending on the opening amount were observed only at the point M. In the RPC, the thickness of the ST and BUC decreased significantly as the opening amount increased (ST thickness between MR and partial mouth opening, MR, and MMo: P=.007, P=.001, BUC: P=.018, P=.001, respectively)& nbsp; Conclusions. The thickness of the ST and BUC differed depending on the site. During mouth opening, these changes in thickness at each site are proportional to the differences in ST and BUC thickness. (J Prosthet Dent 2021;125:759-65)
机译：问题陈述。颊粘膜舌侧壁接触点与粘膜下组织（ST）和颊肌（BUC）在功能过程中的变化比例之间的关系尚不清楚nbsp；意图本临床研究的目的是通过磁共振成像阐明全口义齿佩戴者ST和BUC的空间和动力学，并研究义齿基托形状如何影响空间密封以及ST和BUC之间的关系nbsp；材料和方法。八名戴上颌和下颌全口义齿的无牙参与者被纳入研究。在义齿颊侧边缘添加蜡，在下颌休息（MR）期间进行轴向和冠状位磁共振成像扫描，以观察磨牙后垫上方颊粘膜和舌头的关系。此外，在轴向图像上，在三个位置测量ST和BUC的厚度：第二磨牙中心、第二磨牙远端（SMD）和磨牙后垫中心（RPC）。在MR、部分张口和中张口（MMo）期间进行冠状位成像。在第二磨牙中心、SMD和RPC处，在上颌颊肌附着区（A点）、下颌颊肌附着区（B点）以及A和B之间的中点（M点）测量ST和BUC的厚度nbsp；后果在磁共振成像期间，81%的受试者观察到口腔粘膜和舌头在RPC上的接触密封。在用蜡扩大义齿基托后，86%的参与者失去了接触。随着蜡的加入，RPC上的ST和BUC厚度显著降低。在MR期间，ST的位置越靠后，其厚度就越大。无论张口情况如何，M点的ST明显比A点厚。在MR和MMo期间，SMD和RPC中的ST和BUC厚度在M点明显大于B点。ST和BUC厚度的差异取决于开口量，仅在M点观察到。在RPC中，ST和BUC的厚度随着开口量的增加而显著降低（MR和部分张口、MR和MMo之间的ST厚度分别为：P=.007、P=.001、BUC:P=.018、P=.001）；结论。ST和BUC的厚度因场地而异。在张口期间，每个部位的厚度变化与ST和BUC厚度的差异成正比。（J Pruttht凹陷2021；125:75-65）

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