Abstract: Objective: To design a new type of appliance to upright the impacted mandibular second molars and observe the clinical effects. Methods: The looped molar retractor (LMR) had three components: bands, lingual arch, and loop with silver solding spurs and ligature regions. LMR was fabricated and used in the treatment of 5 cases with bilateral impacted mandibular second molar and 2 cases with unilateral impacted mandibular second molars. The clinical effects were observed and evaluated. Results: All the impacted second molars were up-righted successfully in short time. The average period of treatment was 4 months. The loss of anchorage was not observed. Conclusion: LMR is an ideal tool to up-right the impacted inclined second molar.

Key words: Mandibular, second, molar, Uprightor, Impaction