Effect of metal strengthener length on stress distribution in acrylic denture bases: a finite element study.
This study investigated the influence of metal strengthener length on stress created in acrylic denture bases in relation to location of the vertical support to the dentures. Finite element analysis was conducted to calculate stress generated in the straps of 2 mm-thickness and 18 mm-width that were reinforced with metal strengtheners of five different lengths. A vertical biting force of 60 N was directed on one end of each strap, while the other end was fixed. Vertical movements were restricted at one of the three support locations between the centre of the strap and the loading site. When the straps were vertically supported near the loading site, greater maximum tensile stresses were seen in the straps with relatively short strengtheners than those shown in the straps with longer strengtheners. The metal strengtheners with sufficient length may provide a preventive denture design against the acrylic fractures.
Shimizu
H
H
Removable Prosthodontics, Department of Masticatory Function Rehabilitation, Division of Oral Health Sciences, Tokyo Medical and Dental University, Tokyo, Japan.
Ikeda
T
T
Wakabayashi
N
N
Ohyama
T
T
D000180:Acrylic Resins; D003799:Dental Stress Analysis; D003819:Denture Bases; D003779:Denture Design; D020342:Finite Element Analysis; D008670:Metals; D011109:Polymethacrylic Acids; D013718:Tensile Strength
D000180:Acrylic Resins; D008670:Metals; D011109:Polymethacrylic Acids; C030613:polymethacrylic acid