"Análise comparativa, pelo método dos elementos finitos bidimensional, das tensões geradas nas estruturas de suporte de prótese parcial removível de extremidade livre inferior, em rebordo horizontal e descendente-ascendente" / A two-dimensional finite element analysis of the stress distribution in the supporting structures of a distal extension base removable partial denture over a horizontal and descending/ascending residual ridge.

AUTOR(ES)

Carla Aparecida Seno Plaza

DATA DE PUBLICAÇÃO

2005

RESUMO

This study is a two-dimensional finite element analysis (FEA) of the stress distributionin the supporting structures – compact and cancellous bone; periodontal ligament and oral mucosa – for a distal extension base removable partial denture (RPD) modeled on mandibular dental archs with two residual ridge forms: horizontal and descending-ascending. The two experimental quadrant models were developed in the AUTOCAD 2004 (Autodesk Inc., USA), software to include the first premolar asthe dental support with a distal occlusal rest; the second premolar and first molar as the artificial teeth inserted on the base over an RPD framework and the residual ridge. These models were discretized on the FEA software (I-DEAS, USA) and an axial load of 100 N was applied to the mesh on the artificial teeth cusps either on the first mola r (C1) or on the second premolar (C2). It was noticed that, in the cancellous bone, the maximum strain was around the supporting tooth, mainly in the distalcervical third (0.003 mm) while the largest compression tension (CT) was at the tooth apex when the load was applied over the second premolar, with a horizontal residual ridge (0,621 N/mm 2 ). When the ridge was descending-ascending, the areas affected were the same, showing 0,003 mm and 0,609 N/mm 2 , respectively as the maximum displacement and CT. In the oral mucosa, the largest results occurred when the load application point was over the first molar and the residual ridge was horizontal: 0,137 mm and 0,144 N/mm 2 . The descending-ascending alveolar ridge showed the maximum displacement and CT in the ascending segment of the residual ridge, toward the retromolar trigon, with 0,131 mm and 0,122 N/mm 2 , respectively. Within the constraints of this study, it was concluded that: 1 – The compact bone shows greater stress concentration than the cancellous bone; 2 – The compact bone shows greater area displacement concentration than the cancellous bone; 3 – The descending-ascending residual ridge with the load application on the first molar showed the largest displacement of the oral mucosa when compared to the periodontal ligament displacement with a 10:1 ratio; 4 – The descending-ascending residual ridge had a less favourable stress distribution than its horizontal counterpart; 5 – The load applied on the first molar produced more distal torquing on the supporting tooth than that on the second premolar.

ASSUNTO(S)

análise de tensões rebordo horizontal descending-ascending residual ridge método dos elementos finitos stress analysis method rebordo descendente-ascendente prótese parcial removível de extremidade livre distal extension base removable partial denture horizontal residual ridge finite element

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