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Application of micro-screws, or correction of maxillary protrusion protrusion pairs of arch_3310

By Tony Allen,2014-10-30 09:22
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Application of micro-screws, or correction of maxillary protrusion protrusion pairs of arch_3310

Application of micro-screws, or correction of maxillary

    protrusion protrusion pairs of arch

[Abstract] Objective To study the application of micro-implant anchorage

    screw-type treatment of upper anterior teeth protrusion or double arch protrusion. Methods 15 cases of the upper dentition orthodontic patients anterior teeth covering the ? ? or more, with an average coverage of

    9.9mm. Anterior adductor stages from self-tapping screws micro-implant,

    implant maxillary first permanent molar and maxillary second molar or the

    maxillary first permanent molar and second premolar buccal alveolar between apical interval, to 100 ~ 150g force on each side within a close sliding front teeth. Adduction compared before and after the skull X-ray

    photography, measurement of anterior adductor and Anchorage changes. Results 15 cases of dental arch protrusion were significantly improved, incisive cutting edge of mean adduction 6.9mm, the average molar anchorage forward 0.4mm, teeth in the front and rear direction and vertical to the

    place were not a significant move, implants remained stable . Conclusion micro-titanium screw anchorage can be effective treatment of maxillary anterior teeth protrusion or double-arch protrusion patients, play a

    strong molar anchorage performance.

    [Key words] orthodontic anchorage micro-titanium screw anchorage or

    double-arch dentition protrusion protrusion

     [Abstract] Objective To evaluate the treatment results of maxillary protrusion or bimaxillary protrusion cases by the application of

    microcrew anchorage. Methods The study comprised 15 patients, whose ages ranged from 14.5 to 40.5 years, average (26.3 ? 6.2) years. All the

    patients presented maxillary protrusion, a mean of 9.9 mm in maxillary anterior teeth.Self-drilling microscrews were implanted in the bilateral

    buccal alveolar bone between maxillary the first and the second molars or between the first molar and second premolar before bonding straight wire appliance.When the main arch was stable enough, the canine and lateral

    incisor were retracted respectively with the microscrew anchorage.100g force each side was applied to miniscrew and retraced teeth.The cephalometric films before and after the relieving of upper anerior teeth croweing were measured and compared. Result Maxillary protrusion in 15

    patients were corrected effectively. Incisors were retracted siginificantly. Molars were moved slightly forward.Central incisor and first molar had no significant changes in anteroposterior and vertical directions. Conclusion Maxillary protrusion could be relieved effectively by microsrew anchorage, with no loss of molar anchorage.

     [Key word] orthodontic anchorage miniscrew anchorage maxillary protrusion or bimaxillary protrusion

     As the tooth did not transfer the amount of bone mass caused by

    protrusion of front teeth or double arch protrusion, correcting these

    problems the fault of jaw deformity, the need to design extraction of first premolars, and the need for all or most of the extraction space to adduction anterior teeth, so Anchorage Anchorage demand strong control [1]. For the protrusion a severely ill patient, in the treatment of early stage to request a good control of Anchorage to avoid the front teeth back and forth movement and anchorage loss of the early design of micro-

    titanium screw anchorage, in batches move to the extraction gap in front teeth closed anterior teeth.

     1 Data and methods

     1.1 General Information

     From January 2006 to November 2007 our hospital out-patient 15

    cases of orthodontic patients, 7 males and 8 females; age of 14.5 ~ 40.5 years old on average (26.3 ? 6.2) years of age. 15 patients, the

    anterior upper dentition teeth covering the ? ? or more, with an

    average coverage of 9.9mm.

     1.2 Methods

     (1) treatment planning and treatment process: 15 cases of protrusion of upper anterior teeth in patients with severe, design extraction of maxillary first premolar, bonded straight wire appliance before the 8 patients with bilateral maxillary first molar and second

    premolar between the buccal side of the 7 patients with bilateral maxillary first molar and second molar buccal side, respectively, self-

    tapping type implanted titanium screw anchorage micro-diameter 1.5mm,

    length 9.0 mm (China-made micro-screw implants MAS) . Stability of 1

    month, Applied Micro titanium screw anchorage traction canine distal movement, traction force value of 100g. To make the direction of traction close to the resistance of the canine center, should be extended canine traction hook. Patients with implanted micro-screws, and anterior

    adductor, respectively positioned lateral skull X-ray films, were measured

    research. After 1 ~ 2.5 years, an average of 19 months; the end of treatment, the canine and the molars to a class of relations, 019 * 025

    square wire fixed three months later, the switch to modified Hawley retainer to maintain (Figure 1). 1 year after referral, does not appear obvious recurrence. (2) X cephalometric analysis: 15 patients in order to palate plane (pp) for the horizontal axis, through before and after

    treatment with a titanium screw head slightly to the palatal mid-point of

    the image plane to the vertical (Y axis) to establish coordinates Department of measuring first molars in the dentition aligned phase of treatment changes in upper incisor cutting edge of point-to-Ypp line (U1-

    Ypp) of the distance; upper central incisor cutting edge of point-to-

    palatal plane (U1-pp) in distance; maxillary first molar mesial buccal tip to Ypp (U6-Ypp) of the distance; maxillary first molar mesial buccal tip to the palatal plane (U6-pp) distance. Reposted elsewhere in the paper for

    free download http://

     1.3 Statistical analysis

     Paired t test.

     2 Results

     A total of 15 patients implanted in 30 patients with micro-screws,

    of which 27 micro-screws during use remained stable, three-aligned

    treatment of anterior teeth loose, re-stabilize after implantation. Before

    and after treatment, 30 implants in the sagittal plane position changes, no significant difference (P

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