European Journal of Prosthodontics and Restorative Dentistry

cover art

Cover Date:
December 2010
Print ISSN:
0965-7452
Vol:
18
Issue:
4

Crown Retention for Non-Retentive Preparations using Adhesive Resin Cements

Abstract - This study examines the effect of preparing teeth with six varying convergence angles (ranging between 12 and 120 degrees) and height (1 and 2 mm) on the retention of cast gold crowns. Six groups of 4 human premolar teeth were prepared to give a flat occlusal surface in dentine with very short axial wall heights (1 or 2 mm) and variation in axial wall convergence (between 12 and 120 degrees). Impressions were recorded of the prepared teeth and custom castings made using a high copper content precious metal alloy. The castings were luted with an adhesive resin and stored in water at 37oC for 24 hours prior to determining the pull-off force in an Instron Universal testing Machine at a cross head speed of 1mm min-1. Twenty two of the twenty four tested specimens failed within the dentine of the tooth, irrespective of preparation orientation. Statistical testing using ANOVA demonstrated that there were no differences between the bond strength values for any of the preparation convergence angles or between preparations with 1 and 2 mm axial wall heights. This suggests that attachment strength of adhesively bonded castings with minimal axial wall height preparations is not influenced by the convergence angle of the preparation. The attachment strength exceeded that cohesive strength of the underlying dentine in nearly all of the adhesively luted restorations.

KEY WORDS: Retention, Crowns, Angle, Adhesive

Article Price
£15.00
Institution Article Price
£
Page Start
155
Page End
157
Authors
Saad A Osman, A.W.G Walls, John F. McCabe

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  1. Extrusion-Mixing Compared with Hand-Mixing of Polyether Impression Materials ?
  2. 150
  3. 154

  1. Crown Retention for Non-Retentive Preparations using Adhesive Resin Cements
  2. 155
  3. 157

  1. The Relationship Between Fibre Post Geometry and Flexural Properties: An Assessment Through a Modified Three-Point Bending Test
  2. 158
  3. 162

  1. Dimensional Stability of Newer Alginate Impression Materials over Seven Days
  2. 163
  3. 170

  1. Repeatability of Electronic Shade Determination and the Influence of Differences in Patient’s Sitting Position.
  2. 171
  3. 175

  1. Frechette Awards 2010
  2. 176
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  1. Surface Characteristic Changes of Dental Ceramics after Cyclic Immersion in Acidic Agents and Titratable Acidity
  2. 177
  3. 184

  1. Evaluation of Bonding Behavior of Silver-Tin-ZincIndium Alloy to Adhesive Luting Cements
  2. 185
  3. 188

  1. Energy Absorption and Hardness of Chair-Side Denture Soft Lining Materials
  2. 189
  3. 194