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Related Experiment Videos

Replacement of missing cusps: an in vitro study

L C Macpherson1, B G Smith

  • 1Department of Conservative Dental Surgery, UMDS, Guy's Hospital, London, UK.

Journal of Dentistry
|April 1, 1994
PubMed
Summary
This summary is machine-generated.

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The best method for replacing a missing tooth cusp is a layered glass ionomer and resin composite restoration without pins. This adhesive technique outperformed pinned amalgam and other pinned adhesive restorations in fracture resistance.

Area of Science:

  • Dental materials science
  • Restorative dentistry
  • Biomaterials engineering

Background:

  • Pinned amalgam restorations are a common method for replacing missing cusps.
  • Adhesive restorative techniques offer potential alternatives with varying retention methods.

Purpose of the Study:

  • To compare the fracture resistance of pinned amalgam restorations against three adhesive restorative techniques.
  • To evaluate the influence of pin retention on the performance of adhesive restorations.

Main Methods:

  • Four restorative techniques were tested: pinned amalgam, pinned composite with dentine bonding agent, cermet with pins, and layered glass ionomer/resin composite without pins.
  • Restored teeth were subjected to occlusal/lateral forces and loaded to fracture using an Instron testing machine.

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Main Results:

  • The layered glass ionomer/resin composite restoration without pins demonstrated significantly higher fracture resistance than all other tested techniques, including pinned amalgam.
  • A composite restoration with dentine bonding agent and pin retention was the second strongest, outperforming pinned amalgam.
  • Cermet restorations with pins showed slightly less fracture resistance than pinned amalgam, though not significantly.

Conclusions:

  • Layered adhesive restorations without pins offer superior fracture resistance for cusp replacement compared to pinned amalgam.
  • Adhesive techniques, particularly layered composite/glass ionomer, represent an advanced and robust alternative to traditional pinned amalgam restorations.