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Effort changes of lower complete denture material caused by relining

Żmudzki J., Chladek W., Krukowska J.

Archives of Materials Science and Engineering

2008

Vol. 31, nr 2

79-82

Purpose: Influence of dentures relining on saddles material effort in case of bone foundation not affected by any atrophic changes has been examined. Design/methodology/approach: Stresses levels in material of denture saddles bearing structure have been determined for any cases where alveolar ridges of mandible are well preserved. This research has been carried out in simulated conditions of biting loads, by means of a FEM. Compared were not-relined vs. relined saddles for two variants of bottom denture saddles margins, i.e. ended smoothly and with an extension that increases the amount of material of the bearing structure. Analyzed was also the influence on deformability of relining layers. Findings: Equivalent Huber-Misses stresses on a good saddles surface in case of a not-relined denture have slightly exceeded the level of 2 MPa, whereas in case of a relined denture with a soft margin they have reached 4 MPa; and for variant of relined denture with extended margin they reached a level of 14 MPa. Modulus of elasticity of the relining has not influenced significantly the effort of saddles material. Research limitations/implications: Assumed were vertical loading forces of 100 N simplified denture geometry without separating any complex shapes of artificial teeth. Practical implications: Increase of the bearing surface of relined saddles by means of extended margins results in stress concentration. Hence, attempts should be made to form the margins and teeth profiles changes at their base smoothly. All micro damages in endangered areas of saddles’ margins should be removed. Originality/value: Relining of low dentures’ saddles in a well preserved bone foundation does not directly result in excedance of allowable stress levels for prosthetic acrylic resins. Hence, the causes of failures should be sought in the impact of geometrical notches, or potentially existing damages that initiate degradation processes.