Pain-related analysis on a resorbed ridge with various denture occlusal schemes using finite element method.

Resorbed alveolar ridges, particularly in the lower jaw, have a small denture supporting area, which may cause the stress distribution of mastication load to exceed the pressure-pain threshold (PPT) and induce pain in the mucosa or potentially worsen the ridge resorption. Thus, choosing the ideal occlusal scheme among bilateral balanced (BBO), lingualized (LO), and monoplane (MO) for such conditions becomes crucial. The experiment was conducted using the finite element method on a modeling of a resorbed alveolar ridge in the lower jaw with three dentures placed on top, each of which was given different loading points according to the tooth arrangement of BBO, LO, and MO. The axial load was 100 N, and the resultant oblique loads on BBO and LO were 119 N and 106 N, respectively. The von Mises stresses for BBO, LO, and MO were observed in nine denture-supporting areas, and the results showed that the axial load did not produce stresses that exceeded the PPT value (0.64925 MPa) for BBO, LO, and MO with the highest value on area H, 0.43229 MPa, 0.39715 MPa, and 0.31576 MPa, respectively. However, the oblique load direction showed that the BBO had more areas (area E 0.80778 MPa and area H 0.76256 MPa) that exceeded the PPT than LO (area E 0.64394 MPa). The lingualized occlusal scheme is ideal for patients with resorbed alveolar ridge conditions, especially in terms of limiting interferences when the denture is functioning while maintaining comfort but still providing good masticatory performance and satisfactory esthetics.

Pain-related analysis on a resorbed ridge with various denture occlusal schemes using finite element method

Abstract Resorbed alveolar ridges, particularly in the lower jaw, have a small denture supporting area, which may cause the stress distribution of mastication load to exceed the pressure-pain threshold (PPT) and induce pain in the mucosa or potentially worsen the ridge resorption. Thus, choosing the ideal occlusal scheme among bilateral balanced (BBO), lingualized (LO), and monoplane (MO) for such conditions becomes crucial. The experiment was conducted using the finite element method on a modeling of a resorbed alveolar ridge in the lower jaw with three dentures placed on top, each of which was given different loading points according to the tooth arrangement of BBO, LO, and MO. The axial load was 100 N, and the resultant oblique loads on BBO and LO were 119 N and 106 N, respectively. The von Mises stresses for BBO, LO, and MO were observed in nine denture-supporting areas, and the results showed that the axial load did not produce stresses that exceeded the PPT value (0.64925 MPa) for BBO, LO, and MO with the highest value on area H, 0.43229 MPa, 0.39715 MPa, and 0.31576 MPa, respectively. However, the oblique load direction showed that the BBO had more areas (area E 0.80778 MPa and area H 0.76256 MPa) that exceeded the PPT than LO (area E 0.64394 MPa). The lingualized occlusal scheme is ideal for patients with resorbed alveolar ridge conditions, especially in terms of limiting interferences when the denture is functioning while maintaining comfort but still providing good masticatory performance and satisfactory esthetics.

Resumo Os rebordos alveolares reabsorvidos, especialmente na mandíbula inferior, têm uma pequena área de suporte para prótese, o que pode fazer com que a distribuição de estresse da carga mastigatória exceda o limiar de pressão-dor (PPT) e induza dor na mucosa ou piore potencialmente a reabsorção do rebordo. Assim, a escolha do esquema oclusal ideal entre balanceado bilateral (BBO), lingualizado (LO) e monoplano (MO) para essas condições torna-se crucial. O experimento foi conduzido usando o método de elementos finitos em um modelo de um rebordo alveolar reabsorvido na mandíbula inferior com três dentaduras colocadas na parte superior, cada uma das quais recebeu diferentes pontos de carga de acordo com o arranjo dentário de BBO, LO e MO. A carga axial foi de 100 N, e as cargas oblíquas resultantes em BBO e LO foram de 119 N e 106 N, respectivamente. As tensões de von Mises para BBO, LO e MO foram observadas em nove áreas de suporte da dentadura, e os resultados mostraram que a carga axial não produziu tensões que excedessem o valor PPT (0,64925 MPa) para BBO, LO e MO com o valor mais alto na área H, 0,43229 MPa, 0,39715 MPa e 0,31576 MPa, respectivamente. Entretanto, a direção da carga oblíqua mostrou que o BBO tinha mais áreas (área E 0,80778 MPa e área H 0,76256 MPa) que excediam a PPT do que o LO (área E 0,64394 MPa). O esquema oclusal lingualizado é ideal para pacientes com condições de rebordo alveolar reabsorvido, especialmente em termos de limitação de interferências quando a dentadura está funcionando, mantendo o conforto, mas ainda proporcionando um bom desempenho mastigatório e uma estética satisfatória.