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[Class I and II cavities for amalgam restorations]
Tandlaegebladet
|May 1, 1989
Summary
Danish dentists prepare deeper Class II cavities with more converging walls, potentially impacting amalgam filling longevity. Further longitudinal studies are needed to confirm if these preparation differences increase bulk fractures and affect restoration survival.
Area of Science:
- Dental materials science
- Restorative dentistry
- Clinical dentistry
Background:
- Class II amalgam restorations are frequently replaced due to bulk fractures.
- A Danish survey indicated bulk fractures as a primary reason for amalgam filling replacement.
Purpose of the Study:
- To investigate differences in Class II cavity preparations between Danish and other Scandinavian dentists.
- To explore potential links between cavity preparation characteristics and amalgam restoration failures.
Main Methods:
- Analysis of 168 Class II cavity preparations from Denmark and other Scandinavian countries.
- Comparison of cavity dimensions, wall convergence, and occlusal outline.
Main Results:
- Danish cavity preparations were significantly deeper occlusally and buccally.
- Danish cavities exhibited more converging proximal walls and broader occlusal bucco-lingual outlines.
- The clinical significance and direct cause of bulk fractures in Danish amalgam fillings remain unclear.
Conclusions:
- Observed differences in cavity preparation exist between Danish and other Scandinavian dentists.
- Further longitudinal clinical studies are required to determine if these preparation variations influence isthmus fracture frequency and restoration longevity.