Abstract
AbstractThe intrusion of over-erupted upper molars is an orthodontic problem of major difficulty. When conventional appliances are used, the extrusion of adjacent teeth is likely. However, in recent years, temporary anchorage devices have been used to avoid unwanted side effects. For this purpose, mini-implants have primarily been inserted in the alveolar process. However, due to many disadvantages associated with mini-implant placement between the roots of the upper molars, it is now preferred to insert miniimplants in the anterior palate, which ensures a low risk of failure or mini-implant fracture.The ‘Mini-Mousetrap’ appliance (without a TPA) was designed as a less bulky alternative to the ‘Mousetrap’ (with a TPA), and is comprised of two mini-implants in the anterior palate and attached lever arms for molar intrusion. If a TPA is not used, molar movement must be monitored and the direction of the force adjusted to avoid unwanted molar tipping.
Highlights
Upper molars often over-erupt when there are missing lower molars
The anterior palate offers a location of high bone quality, thin soft tissues, and nearly no risk of dental interference or root damage, which allows the insertion of mini-implants with a very high success rate.[25]
The appliance includes the use of two mini-implants in the anterior palate and a lever arm to the occlusal surface of the molar to be intruded (Figure 1)
Summary
Upper molars often over-erupt when there are missing lower molars. To accomplish prosthodontic rehabilitation in the mandibular arch, it is desirable to intrude the over-erupted upper molars, which often cause the adjacent teeth to extrude when conventional multibracket appliances are used. A molar moved against a mini-implant during intrusion will cease to move, and the root surface may be damaged.[22,23] The anterior palate offers a location of high bone quality, thin soft tissues, and nearly no risk of dental interference or root damage, which allows the insertion of mini-implants with a very high success rate.[25] Mini-implants have been used in the anterior palate in combination with a lever arm.[26,27] Named a ‘Mousetrap’, this appliance generates uppermolar intrusion and is combined with a transpalatal arch (TPA) to avoid palatal molar tipping.
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