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Cavity convergence angles for direct composite inlays.

R W Wassell1, A W Walls, J F McCabe

  • 1Department of Operative Dentistry Dental School, Newcastle upon Tyne, UK.

Journal of Dentistry
|October 1, 1992
PubMed
Summary
This summary is machine-generated.

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Direct composite inlays require a minimum cavity convergence angle (taper) for reliable removal. An 18-degree taper significantly reduces removal forces, preventing damage to the tooth and inlay.

Area of Science:

  • Dental Materials Science
  • Restorative Dentistry
  • Biomaterials Engineering

Background:

  • Direct composite inlays can present challenges during removal from prepared cavities post-polymerization.
  • Understanding factors influencing inlay retention and removal is crucial for clinical success and minimizing tooth damage.

Purpose of the Study:

  • To determine the minimum cavity convergence angle (taper) necessary for reliable removal of direct composite inlays.
  • To evaluate the influence of cavity finish and size on inlay withdrawal forces.

Main Methods:

  • Standardized mesio-occlusal-distal cavities with varying convergence angles (6, 12, and 18 degrees) were prepared in human teeth.
  • Cavities were finished using tungsten carbide or diamond burs.
  • Composite resin inlays were fabricated and their removal forces measured using a universal testing machine.

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  • Statistical analysis (ANOVA, regression) was employed to assess the impact of taper, finish, and size.

    • Main Results:

    • Unacceptably high forces were required to remove inlays from cavities with 6-degree and, to a lesser extent, 12-degree convergence angles.
    • An 18-degree convergence angle resulted in statistically significant lower inlay withdrawal forces.
    • Cavity finish and tooth size did not demonstrably influence the force required for inlay removal.

    Conclusions:

    • An 18-degree cavity convergence angle is recommended to ensure reliable and safe removal of direct composite inlays.
    • This taper minimizes the risk of damage to both the tooth structure and the composite inlay during the withdrawal procedure.