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The ball mill as a means of investigating the mechanical failure of dental materials.

Abu Kasim, N H; Millett, D T; McCabe, J F.
J Dent; 24(1-2): 117-24, 1996.
Artigo em Inglês | MEDLINE | ID: mdl-8636482

OBJECTIVE:

The main purpose of this paper is to present a new method of predicting clinical performance using mechanical loading in a ball mill.

METHODS:

A series of four experiments (two involving a hybrid composite and one each on orthodontic brackets and bands) is described in which the ball mill was used to subject specimens to mechanical fatigue.

RESULTS:

A reproducibility study using composite beam specimens showed no significant difference between the Mean Survival Time (MST) in all the three experimental runs (P = 0.42). When subjected to thermal cycling, the MST of the cycled group was 155.0 min compared to 247.0 min for the control group (P < 0.01). The MST of untreated and sandblasted brackets was 7.9 h and 14 h respectively (P < 0.01). There is also a significant difference (P < 0.001) in the MST of sandblasted bands when compared to the untreated bands.

CONCLUSIONS:

The ball mill proved to be a convenient and reproducible means of producing mechanical fatigue and may be useful in predicting the clinical performance of dental materials.