Cacciafesta V, Sfondrini MF, Scribante A, Klersy C, Auricchio F.
Evaluation of friction of conventional and metal-insert ceramic brackets in various bracket-archwire combinations (Am J Dent. 1991 Oct;4(5):207-10.)
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Hain M, Dhopatkar A, Rock P.
The effect of ligation method on friction in sliding mechanics. (Am J Orthod Dentofacial Orthop. 2003 Apr;123(4):416-22.)
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