Gazit E, Lieberman M A
Angle Orthod. 1985 Oct;55(4):316-20. doi: 10.1043/0003-3219(1985)055<0316:OCFOT>2.0.CO;2.
Measurement of occlusal contacts on 12 orthodontically treated patients were measured by the photocclusion technique finds a mean increase of 56% in the number of contacts in the first year following treatment.