| 摘要 |
The useful model is applicable in medicine, and in particular in dentistry in orthodontics and dentistry, such as is used in the upper jaw in a mixed dentition and permanent. Retention apparatus includes a vestibular arc (1), covering the latest teeth from tooth row, two transitions (3) of the vestibular arc (1) located distally of the canine, lingual arc (11), left plaque portion (4) and right plaque part (18) with extended range to the tubercles of the side teeth of 6 to 7 mm above the gingival margin of teeth from tooth row. Vestibular arc (1), speaking arc (11), the left-arm hook (6) and right-arm hook (16) are made of chrome-nickel steel wire. With input lingual arc (11), left plaque portion (4) and right plaque (18) possible adjustments to catch up with the growth of the jaw, leading to an increase in the period of wear the retention apparatus. |
