Figure 1From: Mineral trioxyde aggregate versus calcium hydroxide in apexification of non vital immature teeth: Study protocol for a randomized controlled trial Device used to realize reproducible radiographs at each session. The patient is asked to bite into a piece of silicone, which enables us to put the film holder and so the radiograph in the same position at each session. 1a: piece of silicone. 1b: film holder. 1c: Radiograph.Back to article page