interproximal en · ADJ
Etymology
From inter- + proximal.
Meanings
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(not-comparable) Between the proximal parts of two adjoining surfaces, but especially between the surfaces of adjoining teeth.
Transillumination of anterior teeth, using the composite curing light placed labially to shine through the tooth and be viewed using the mouth mirror, shows up any cavities as dark interproximal shadows.
2013, Carole Hollins, Questions and Answers for Dental Nurses, page 44: