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日本語AIでPubMedを検索

日本語AIでPubMedを検索

PubMedの提供する医学論文データベースを日本語で検索できます。AI(Deep Learning)を活用した機械翻訳エンジンにより、精度高く日本語へ翻訳された論文をご参照いただけます。
J Prosthet Dent.2020 May;S0022-3913(20)30149-9. doi: 10.1016/j.prosdent.2020.02.013.Epub 2020-05-22.

後歯列における口腔粘膜下組織と咬筋動態の形態学的磁気共鳴イメージング研究.臨床研究である。

Morphological magnetic resonance imaging study of oral submucosal tissue and buccinator muscle dynamics in the posterior dentition: A clinical study.

  • Jiro Abe
  • Soshi Hanawa
  • Keiichi Sasaki
PMID: 32451141 DOI: 10.1016/j.prosdent.2020.02.013.

抄録

問題提起:

頬粘膜と舌側壁の接触点の関係や、粘膜下組織(ST)とブッキネーター筋(BUC)が機能中にどの程度の割合で変化するかは不明である。

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.

目的:

本臨床研究の目的は、完全義歯装着者におけるSTとBUCの空間とダイナミクスを磁気共鳴イメージングを用いて明らかにし、義歯床の形状が空間封鎖とSTとBUCの関係にどのように影響するかを検討することであった。

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.

材料と方法:

上顎と下顎の総入れ歯を装着した無歯顎の8名が登録された。義歯の頬側縁にワックスを塗布し、下顎安静時に軸方向および冠状磁気共鳴画像を撮影し、頬粘膜と舌の関係を観察した。また、アキシャル画像では、第二大臼歯中心、第二大臼歯遠位(SMD)、網膜パッド中心(RPC)の3部位でSTとBUCの厚さを測定しました。コロナ画像は、MR時、部分開口時、中間開口時(MMo)に撮影した。第二大臼歯中心、SMD、RPCでは、上顎ブキネーター装着領域(A点)、下顎ブキネーター装着領域(B点)、AとBの間の中央点(M点)でSTとBUCの厚さを測定した。

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).

結果:

MR時には81%の参加者でRPC上の頬粘膜と舌の接触封鎖が認められた.ワックスで義歯床を拡張した後は86%の参加者で接触が消失した.RPC上のSTおよびBUCの厚さはワックスの添加により有意に減少した.MR時にはSTは後方に位置するほど有意に厚くなった.口腔内開存にかかわらず、すべての切片において、STはA点よりもM点の方が有意に厚くなっていた。SMDとRPCのSTとBUCの厚さは、MRとMMoの間、B点よりもM点の方が有意に厚かった。開口量によるSTとBUCの厚さの違いはM点でのみ認められ,RPCでは開口量の増加に伴ってSTとBUCの厚さが有意に減少した(MRと部分開口時のSTの厚さ,MRとMMoの間のSTの厚さ:P=.007,P=.001,BUCの厚さ:P=.018.それぞれP=.018,P=.001) CONCLUSIONS.STとBUCの厚さは部位によって異なっていた。開口時の各部位での厚さの変化は、STとBUCの厚さの違いに比例していた。

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) 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.

Copyright © 2020 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.