Effect of complete and partial removable dentures on chewing movements

Abstract

Partial or complete edentulism impairs mastication. However, it is unclear how the chewing cycle is affected by prosthetics. We evaluated the chewing movements of patients fitted with complete (CD) or removable partial denture (RPD). A total of 29 subjects were kinesiographically evaluated during chewing of peanuts and Optocal portions in a random sequence. The subjects were divided into two groups according to prosthesis type. Group RPD was composed of 14 partially edentulous patients using a lower distal extension RPD (mean age 61 ± 8 years), and group CD contained 15 completely edentulous patients using CD (mean age 65·9 ± 7·9 years) in both jaws. Opening, closing, occlusal and masticatory cycle times, movement angle (opening and closing), maximum velocity (opening and closing), total area and chewing cycle amplitudes were evaluated. The results were subjected to anova and Tukey's HSD test at a significance level of 5%. The RPD group exhibited shorter opening and closing phases and masticatory cycle time (P < 0·05). Maximum velocities were also higher in the RPD group, irrespective of the test material (P < 0·05). The area and amplitude of the chewing envelope was smaller in the CD group (P < 0·0001). The test material did not influence chewing cycles in any of the parameters evaluated (P > 0·05). RPD wearers use a faster chewing sequence with greater vertical and lateral jaw excursions compared with CD wearers.

An electromyographic study on the sequential recruitment of bilateral sternocleidomastoid and masseter muscle activity during gum chewing

“…). The software output parameters include the averaged times of the opening, closing and threshold phases .…”

Análisis Cinemático de la Masticación de una Granola Prototipo en Contraste con la Masticación de Maní

“…Método de grabación. Se registraron los MM bordeantes en los tres planos del espacio y los movimientos masticatorios para 3,7 g de maní (Gonçalves et al, 2014) y para 3,7 g de granola (prototipo) mediante un articulógrafo electromagnético (EMA) 3D modelo AG501 (Carstens Medizinelektronik, Bovenden, Alemania). Para este estudio se utilizaron cuatro sensores del EMA 3D, que se fijaron a la piel del participante con un pegamento tisular biocompatible (Epiglu®, Meyer Haake, Alemania).…”

Sensorial Ability, Mastication and Nutrition of Single-Implant Overdentures Wearers

“…Mandibular chewing movements were evaluated using a jaw-tracking kinesiograph device (JT-3D; BioResearch, Milwaukee, Wisconsin, USA). Each subject was seated with the Frankfort plane parallel to the ground and a small magnet was attached temporarily to the artificial incisors of the mandibular prosthesis (21). The device's magnetic sensor was placed on the participant's head and adjusted according to the manufacturer's instructions.…”