Supra-erupted maxillary molar teeth pose a major restorative challenge when attempting to prosthetically rehabilitate a partially edentulous mandibular dental arch. Traditional approaches with conventional tooth-borne appliances usually entail undesirable side-effects, including extrusion of adjacent teeth. Temporary anchorage devices (TADs), often inserted in the alveolar process, should help to minimize this phenomenon. The interradicular placement of mini-implants positioned between the roots of the maxillary molars has a number of inherent disadvantages and limitations. The preferred site for insertion of mini-implants is the anterior palate, which ensures a low risk of failure and mini-implant fracture. The 'Mousetrap' appliance is comprised of two mini-implants in the anterior palate, with attached lever arms for molar intrusion and a transpalatal arch (TPA) to avoid unwanted palatal tipping of the molar to be intruded. The 'Mini-Mousetrap' appliance was designed as a pared-down version without a TPA. If a TPA is not used, molar movement must be closely monitored, and the line of force action may need modification in order to minimize unwanted molar tipping. (C) 2020 Published by Elsevier Inc.
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