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Molar spreaders are used to loosen the periodontal ligament and hence the tooth through applying it to the interdental space.
The varying jaw thickness enables different spreading effects.
Spreader No. 1 – Narrow – the 0.16 inches (4mm) thickness works much finer than No. 2 – Medium. No. 1 is mainly used as the first step spreader for the maxillary cheek teeth because they are wider than mandibular cheek teeth.
Spreader No. 2 – Medium – the 0.19 inches (5 mm) thickness works for the upper jaw as a second step and for mandibular cheek teeth as a first step.
Spreader No. 3 – Wide – the 0.24 inches (6 mm) thickness is used only partially (1/3-2/3) for the maxillary cheek teeth and up to full effect for mandibular cheek teeth.
It is recommended to use the forceps to loosen the tooth with rotational movements between the spreading steps, otherwise the risk of breaking the tooth/roots will increase.