European Journal of Prosthodontics and Restorative Dentistry

cover art

Cover Date:
June 2009
Print ISSN:
0965-7452
Vol:
17
Issue:
2

Determining the Dimensional Stability, Fracture Toughness and Flexural Strength of Light-cured Acrylic Resin Custom Tray Material

Abstract - Light-cured acrylic resin custom tray material is used in commercial dental laboratories but little evidence-based scientific information on its physical properties is available. Objectives: This study investigates the dimensional stability of light-cured acrylic resin custom tray material and compares its fracture toughness and flexural strength to a chemically-cured acrylic material. Method: For dimensional stability, 20 light-cured specimens were fabricated and measured 3 times at regular time intervals over 48 hours. Mean shrinkage was calculated for each time interval and the mean values were compared to the standard using the Wilcoxon Rank Sum test. A p-value of <0.05 was considered significant. For fracture toughness, 2 groups of 20 light-cured and chemically-cured acrylic materials with a single-edge notch were subjected to a compressive load using the 3-point bending technique. For flexural strength, 1 group (n=20) of each material was subjected to a compressive load using 3-point bending. The highest load before failure was used to calculate the fracture toughness and flexural strength. Differences in fracture toughness and flexural strength values between the 2 groups were compared using ANOVA testing. A p-value of <0.05 was considered significant. The chemically-cured group was accepted as the control group. Results: Compared to the standard, shrinkage was significant for all time intervals (p<0.05). The difference in shrinkage among time intervals was not significant (p>0.05). The fracture toughness and flexural strength were significantly higher for the light-cured material. Conclusions: Trays made from light-cured acrylic resin can be used immediately following polymerization. The light-cured material is more resistant to bending and crack propagation than the chemically-cured type.

KEY WORDS: Custom tray; polymethyl methacrylate resin; chemically-cured; light-cured; dimensional stability; fracture toughness; flexural strength.

Article Price
£15.00
Institution Article Price
£
Page Start
67
Page End
72
Authors
S. B Khan, G. Geerts

Articles from this issue

  • Title
  • Pg. Start
  • Pg. End

  1. Biomechanical Methods Applied in Dentistry: A Comparative Overview of Photoelastic Examinations, Strain Gauge Measurements, Finite Element Analysis and Three-dimensional Deformation Analysis
  2. 50
  3. 57

  1. Effect of Curing Cycles on the Mechanical Properties of Heat Cured Acrylic Resins
  2. 58
  3. 60

  1. A Questionnaire Based Study to Investigate the Variations in the Management of Tooth Wear by UK and Prosthodontists from Other Countries
  2. 61
  3. 66

  1. Determining the Dimensional Stability, Fracture Toughness and Flexural Strength of Light-cured Acrylic Resin Custom Tray Material
  2. 67
  3. 72

  1. The Reproducibility and Accuracy of Internal Fit of Cerec 3d Cad/cam all Ceramic Crowns
  2. 76
  3. 77

  1. Three-Dimensional Finite Element Analysis of Posterior Fiber Reinforced Composite Fixed Partial Denture: Framework Design for Pontic
  2. 78
  3. 84

  1. Prosthetic Status and Treatment Needs among Patients Attending the Prosthodontic Department in a Dental Institute in India
  2. 85
  3. 89

  1. Effects of Vertical Interarch Space and Abutment Height on Stress Distributions: A 3d Finite Element Analysis
  2. 90
  3. 94

  1. IADR Pre-Prosthetic Regenerative Science Award Ceremony
  2. 95
  3. 95