Miniscrews are effective devices for performing upper incisor intrusion. Different mechanics can be applied depending on the treatment objectives. This study aimed to evaluate the efficacy of one or two anterior miniscrews for upper incisor correction in cases of overbite and angulation in adult patients. Forty-four adults with deep overbite were divided into two groups: group 1 was treated with one miniscrew between upper central incisors and group 2 with two miniscrews between upper lateral incisors and canines. Incisor intrusion and length were measured from lateral cephalograms before treatment, after treatment and at least 12 months into retention (T0, T1 and T2). Forces were applied (90 g) from the miniscrews to the archwire using elastomeric chains. ANOVA analysis was used to determine whether differences between evaluation times were statistically significant. Mean root resorption was 2.15 ± 0.85 mm, which ceased after active treatment. Overbite mean correction was − 3.23 ± 1.73 mm with no statistically significant relapse. Overbite correction and incisor intrusion were significantly greater in group 2 (− 3.80 ± 1.43 versus − 2.75 ± 1.63 for OB and 8.19 ± 3.66 versus 5.69 ± 2.66 for intrusion). Resorption and overbite correction were positively related. No counterclockwise rotation of the mandibular plane was observed. Overbite correction can be performed by means of upper incisor intrusion without rotation of the mandibular plane. Correction of upper incisor intrusion and overbite is greater in patients treated with two miniscrews. The increase in upper incisor buccal angulation is greater with one miniscrew. Root resorption is positively related to the extent of intrusion. Stability is satisfactory regardless of whether one or two miniscrews are used.

中文翻译：

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一或两个前微螺钉用于矫正上门牙咬合和成角度：一项回顾性比较研究。

小螺钉是进行上切牙切入的有效装置。可以根据治疗目标应用不同的机制。这项研究旨在评估成年患者咬合和成角度情况下一或两个前微螺钉对上切牙矫正的疗效。四十四具深覆牙合的成年人分为两组：第一组用上中切牙之间的一个小螺钉治疗，第2组使用上侧切牙和犬齿之间的两个小螺钉治疗。在治疗前，治疗后以及保留至少12个月（T0，T1和T2）时，根据侧位脑波图测量切牙的侵入程度和长度。使用弹性链从微型螺钉向弓丝施加力（90 g）。方差分析用于确定评估时间之间的差异是否具有统计学意义。平均根吸收为2.15±0.85 mm，在积极治疗后停止。覆牙矫正均值为− 3.23±1.73 mm，无统计学意义的复发。第2组的咬合矫正和门牙侵入明显更大（OB的-3.80±1.43 vs-2.75±1.63，侵入的为8.19±3.66 vs 5.69±2.66）。吸收和咬合矫正呈正相关。没有观察到下颌平面的逆时针旋转。可以通过上切牙的侵入进行下颌矫正，而不会使下颌平面旋转。用两个微型螺钉治疗的患者上切牙侵入和咬合的矫正效果更大。一枚微螺钉上颌切牙颊角的增加更大。根吸收与入侵程度呈正相关。无论使用一个或两个微型螺钉，稳定性都令人满意。