Distal Movement of Maxillary Molars Using Miniscrew Anchorage in the Buccal Interradicular Region

Abstract

Objective: To quantify the treatment effects of interradicular miniscrew anchorage and to confirm the validity of the clinical usage of interradicular miniscrews in the distal movement of maxillary molars in nonextraction treatment. Materials and Methods: Twenty-four maxillary molars were moved to the distal using miniscrews placed in the interradicular space between the second premolar and the first molar at an oblique angle of 20 to 30 degrees to the long axis of the proximal tooth. The teeth were evaluated as to how the molars were moved to the distal with the use of lateral cephalograms and dental casts. Results: Maxillary molars were moved to the distal by 2.8 mm with distal tipping of 4.8 degrees and intruded by 0.6 mm. Maxillary incisors were moved to the distal by 2.7 mm with palatal tipping of 4.3 degrees. Molar extrusion and/or consequent mandibular rotation was not observed in any patient. Conclusion: Miniscrews placed in the maxillary interradicular space provide successful molar distal movement of 2.8 mm without patient compliance and with no undesirable side effects such as incisor proclination, clockwise mandibular rotation, or root resorption. (Angle Orthod. 2009;79: 78-84.)

Impact of anchorage miniscrews in multibracket treatments without extractions

“…We observe an ''absolute'' resistance to the forces used on the one hand, and we can create available space in the arch on the other hand; -undoubtedly the most important fact, that we also find reported by other authors 63,74 , is that now it becomes possible to achieve retrusion and significant molar distalization especially on the upper arch; this opens up the field of indications and makes orthodontic treatment effective in a totally new way that takes it to the next level; -the skeletal effects that we observed are extremely interesting and the first recorded data should be corroborated by randomized controlled trials with high external validity; -miniscrews provide non-invasive anchorage that can be systematized for any type of patient (during growth, in the young adult or in the senior) and for any type of sagittal and transversal discrepancies.…”

Distalization pattern of the maxillary arch depending on the number of orthodontic miniscrews

“…7,15 In the pretreatment lateral cephalogram, a line parallel to the initial occlusal plane (OP) was drawn through the anterior nasal spine (ANS), which was named the horizontal reference (HR) (Figure 2A). The pretreatment angle between the HR and the sella-nasion line (SN) was transferred to the posttreatment lateral cephalogram ( Figure 2).…”

“…In conventional Class II treatment, efficient treatment necessitated predictable molar distalization and subsequent incisor retraction without ''burning anchorage.'' In this regard, segmental distalization using either miniplates or miniscrews can be meaningful 14,15 in that they could eliminate the possibility of round-tripping the anterior teeth. Accordingly, the possibility of en-masse distalization using interradicular miniscrews or miniplates has been proposed.…”

Selecting the Proper Screw for the Case: Review

“…58 Bu yüzden 50 N/cm 2 'den fazla kuvvet uygulanacak hastalarda immediate yüklemeden kaçınıl-ması yararlı olabilmektedir. MİNİ VİDA KULLANIM ALANLARI Sagital düzlemde; Molar distalizasyonu ve mezializasyonu, 59,60 Kanin retraksiyonu, 61 Orta hat düzeltilmesi. 62 Vertikal düzlemde; Kanin ve keser ekstrüzyonu, 63 Keser intrüzyonu, 64 Molar intrüzyonu.…”