Relationship of restoration width, tooth position, and alloy to fracture at the margins of 13- to 14-year-old amalgams.
The effect of width of the restoration, tooth position, and amalgam type on the fracture of the margins of 13- to 14-year-old, high-copper, amalgam restorations was evaluated. The evaluation assessed 193 photographs of restorations by use of ridit analysis and a rank-ordering test. The results indicated that the width of the restoration was the predominant factor and that tooth position and the different high-copper alloys were less significant. Interactions between tooth position and width indicated that lower premolars with conservative restorations exhibited the least fracture at the margins, and upper premolars with a wide preparation exhibited the most. It is postulated that tooth deflection under mastication may play a role in long-term fracture at the margins of amalgams.
Osborne
J W
JW
Department of Restorative Dentistry, University of Colorado Health Sciences Center, Denver 80262.
Gale
E N
EN
D000704:Analysis of Variance; D003722:Dental Alloys; D003723:Dental Amalgam; D003793:Dental Restoration, Permanent; D005069:Evaluation Studies as Topic; D006801:Humans; D009811:Odontometry; D012307:Risk Factors; D013499:Surface Properties
D003722:Dental Alloys; C033470:Dispersalloy; C036886:tytin; C029301:indiloy; C031360:Sybraloy; D003723:Dental Amalgam