目的:探讨义齿咬合板联合综合物理疗法治疗颞下颌关节盘不可复性前移位(anterior disc displacement without reduction,ADDwoR)的疗效。方法:选择2019年1月—2020年12月衡水市人民医院口腔正畸修复科就诊的牙列缺损或牙重度磨耗并诊断...目的:探讨义齿咬合板联合综合物理疗法治疗颞下颌关节盘不可复性前移位(anterior disc displacement without reduction,ADDwoR)的疗效。方法:选择2019年1月—2020年12月衡水市人民医院口腔正畸修复科就诊的牙列缺损或牙重度磨耗并诊断为ADDwoR患者60例,根据治疗方法不同,随机分为义齿咬合板组(A组)和义齿咬合板+综合物理疗法组(B组)。治疗前、治疗时每3周记录患者最大主动开口度(maximum mouth opening,MMO)、视觉模拟量表疼痛评分(visual analog pain score,VAS)。治疗前及治疗后3个月拍摄锥形束CT(CBCT),分析2组患者治疗前、后临床疗效指标变化及颞下颌关节CBCT三维数据差异。采用SPSS 26.0软件包对数据进行统计学分析。结果:治疗后3周,2组VAS和治疗前相比差异有统计学意义(P<0.05)且B组VAS降低较多;治疗后3周起,B组MMO、VAS和治疗前相比差异有统计学意义(P<0.05)。治疗后9周起,A组MMO与治疗前相比差异有统计学意义(P<0.05),但A组与B组MMO、VAS无统计学差异(P>0.05)。CBCT显示,治疗后关节前间隙变窄,关节后间隙增宽,关节上间隙增大,髁突水平角减小,关节结节斜度、髁突高度增大(P<0.05);关节窝深度、髁突前后径、内外径相比差异无统计学意义(P>0.05)。与A组相比,B组治疗后关节前、上、后间隙,髁突水平角,关节结节斜度差异有统计学意义(P<0.05)。结论:义齿咬合板可有效改善ADDwoR症状,义齿咬合板联合综合物理疗法能迅速改善患者开口度,减轻患者关节区疼痛。展开更多
The problem of diffraction of a plane acoustic wave by a finite soft (rigid) cone is investigated. This one is formulated as a mixed boundary value problem for the three-dimensional Helmholtz equation with Dirichlet (...The problem of diffraction of a plane acoustic wave by a finite soft (rigid) cone is investigated. This one is formulated as a mixed boundary value problem for the three-dimensional Helmholtz equation with Dirichlet (Neumann) boundary condition on the cone surface. The diffracted field is sought as expansion of unknown velocity potential in series of eigenfunctions for each region of the existence of sound pressure. The solution of the problem then is reduced to the infinite set of linear algebraic equations (ISLAE) of the first kind by means of mode matching technique and orthogonality properties of the Legendre functions. The main part of asymptotic of ISLAE matrix element determined for large indexes identifies the convolution type operator amenable to explicit inversion. This analytical treatment allows one to transform the initial diffraction problem into the ISLAE of the second kind that can be readily solved by the reduction method with desired accuracy depending on a number of truncation. All these determine the analytical regularization method for solution of wave diffraction problems for conical scatterers. The boundary transition to soft (rigid) disc is considered. The directivity factors, scattering cross sections, and far-field diffraction patterns are investigated in both soft and rigid cases whereas the main attention in the near-field is focused on the rigid case. The numerically obtained results are compared with those known for the disc.展开更多
文摘The problem of diffraction of a plane acoustic wave by a finite soft (rigid) cone is investigated. This one is formulated as a mixed boundary value problem for the three-dimensional Helmholtz equation with Dirichlet (Neumann) boundary condition on the cone surface. The diffracted field is sought as expansion of unknown velocity potential in series of eigenfunctions for each region of the existence of sound pressure. The solution of the problem then is reduced to the infinite set of linear algebraic equations (ISLAE) of the first kind by means of mode matching technique and orthogonality properties of the Legendre functions. The main part of asymptotic of ISLAE matrix element determined for large indexes identifies the convolution type operator amenable to explicit inversion. This analytical treatment allows one to transform the initial diffraction problem into the ISLAE of the second kind that can be readily solved by the reduction method with desired accuracy depending on a number of truncation. All these determine the analytical regularization method for solution of wave diffraction problems for conical scatterers. The boundary transition to soft (rigid) disc is considered. The directivity factors, scattering cross sections, and far-field diffraction patterns are investigated in both soft and rigid cases whereas the main attention in the near-field is focused on the rigid case. The numerically obtained results are compared with those known for the disc.
