Kinesiographic study of complete denture movement related to mucosa displacement in edentulous patients

Abstract

The mucosa that covers the residual ridges of edentulous patients may present some distortion or displacement when occlusal loading is applied in complete dentures. This distortion and movement of the denture can result in acceleration of residual ridge resorption and loss of retention and stability. The aim of this study was to analyze the pattern of upper complete denture movement related to underlying mucosa displacement. A sample of 10 complete denture wearers was randomly selected, which had acceptable upper and lower dentures and normal volume and resilience of residual ridges. The kinesiographic instrument K6-I Diagnostic System was used to measure denture movements, according to the method proposed by Maeda et al.7, 1984. Denture movements were measured under the following experimental conditions: (A) 3 maximum voluntary clenching cycles and (B) unilateral chewing for 20 seconds. The results showed that under physiological load, oral mucosa distortion has two distinct phases: a fast initial displacement as load is applied and a slower and incomplete recovery when load is removed. Intermittent loading such as chewing progressively reduces the magnitude of the denture displacement and the recovery of the mucosa is gradually more incomplete.

Viscoelasticity of Human Oral Mucosa

“…As a result, the maximum compressive strain accumulates on the surface. The gradual distortion which occurs in the connective tissues indicates that the morphology of the prosthesis-supporting mucosa changes with cyclic chewing (Compagnoni et al, 2003). The present results support our hypothesis, and suggest that surface strain accumulates with sustained and cyclic masticatory forces.…”

A Randomized Clinical Trial of Oral Health‐Related Quality of Life, Peri‐Implant and Kinesiograph Parameters in Wearers of One‐or Two‐Implant Mandibular Overdentures

“…Displacement of maxillary dentures was also observed after 3, 6, and 12 months, which could be related to recovery of the mucosa experiencing clenching forces. Previous studies have shown that this type of displacement was associated with viscoelastic properties of the mucosa that was in close contact with the dentures, which underwent deformation when clenching forces were applied and which gradually recovered. Moreover, displacement and recovery of the mucosa both depend on forces produced by occlusion, its rate of loading, and magnitude .…”

Patient-specific finite element analysis of viscoelastic masticatory mucosa

“…The gradual distortion that occurred in the connective tissues indicated that the morphology of the denture-supporting mucosa changes with chewing. 16 It is suggested that duration of the load is a critical factor that causes strain increment near the surface. On the contrary, the maximum strain at the center of mucosa was relatively constant.…”