Yoshimoto Tasuku, Hasegawa Yoko, Maria Ma Therese Sta, Marito Pinta, Salazar Simonne, Hori Kazuhiro, Ono Takahiro
Division of Comprehensive prosthodontics, Faculty of Dentistry & Graduate School of Medical and Dental Sciences, Niigata University, Niigata, Japan.
College of Dentistry, Manila Central University, Caloocan, Philippines.
J Prosthodont Res. 2023 Oct 13;67(4):539-547. doi: 10.2186/jpr.JPR_D_22_00135. Epub 2023 Feb 4.
Removable partial dentures have a wide range of applications as missing tooth prostheses, and the denture design can be quite diverse. However, the factors affecting masticatory function remain unclear. We investigated the effect of denture design, especially the use of indirect retainers and major connectors, on masticatory function in patients with mandibular bilateral distal extension dentures.
Fifty-three patients with mandibular Kennedy Class I and Eichner classification B occlusal support were included in this study. Masticatory performance (MP) was assessed using gummy jelly. For the dentures, the type of major connector (bar or apron), presence or absence of indirect retainers, number of rests, and number of artificial teeth were evaluated. The number of functional teeth and occlusal support, Eichner classification, maxillary denture usage, mandibular residual ridge height, and duration of denture use were also evaluated. The factors influencing on the MP were evaluated using the Mann-Whitney U test, Spearman's correlation coefficient, and logistic regression analysis.
MP was significantly higher when the major connector was bar-type or when there was an indirect retainer than with an apron-type or no indirect retainer. MP was positively correlated with the number of functional teeth, occlusal support, and number of rests. Logistic regression analysis revealed that the number of functional teeth and the presence or absence of an indirect retainer were factors that significantly influenced the MP.
An indirect retainer setting is useful for achieving good masticatory performance in mandibular bilateral distal extension dentures.
可摘局部义齿作为缺牙修复体应用广泛，义齿设计多种多样。然而，影响咀嚼功能的因素尚不清楚。我们研究了义齿设计，特别是间接固位体和大连接体的使用，对下颌双侧远中游离端义齿患者咀嚼功能的影响。
本研究纳入了53名下颌Kennedy I类和Eichner分类B型咬合支持的患者。使用软糖评估咀嚼性能（MP）。对于义齿，评估大连接体的类型（杆型或舌板型）、是否存在间接固位体、支托数量和人工牙数量。还评估了功能牙数量和咬合支持、Eichner分类、上颌义齿使用情况、下颌剩余牙槽嵴高度和义齿使用时间。使用Mann-Whitney U检验、Spearman相关系数和逻辑回归分析评估影响MP的因素。
当大连接体为杆型或存在间接固位体时，MP显著高于舌板型或无间接固位体时。MP与功能牙数量、咬合支持和支托数量呈正相关。逻辑回归分析显示，功能牙数量和是否存在间接固位体是显著影响MP的因素。
设置间接固位体有助于在下颌双侧远中游离端义齿中实现良好的咀嚼性能。
