OBJECTIVES To determine the prevalence, incidence, and changes in magnitude of labial gingival recessions (LGR) in class II:2 patients during Herbst-Multibracket appliance (Herbst-MBA) treatment (Tx) plus retention. SUBJECTS AND METHODS All class II:2 patients of the Department of Orthodontics, University of Giessen, Germany who completed Herbst-MBA Tx (mean pre-Tx age 15.6 years). The cohort had undergone a Herbst phase (mean 8.1 months) as well as a subsequent MBA phase (mean 14.4 months). Study casts were evaluated from pre-Tx and after Herbst-MBA Tx plus ≥ 24 months of retention. RESULTS Ratable pre-Tx and post-retention study casts (total observation period 53.5 ± 10.3 months) were available from 94 out of 173 patients. No significant difference existed regarding pre-Tx LGR data between patients with and without complete records. The prevalence for teeth with LGR ≥ 0.5 mm was 1.4% pre-Tx respectively 6.7% post-retention. The highest values of up to 5.3% (pre-Tx) and 20.2% (post-retention) were determined for the upper first premolars and lower central incisors. Incidence values of 4.7% (all teeth) and up to 14.9% (upper first right premolars) respectively 11.1% (lower central incisors) were calculated (LGR ≥ 0.5 mm). The overall LGR mean magnitudes were 0.01 mm pre-Tx respectively 0.06 mm post-retention. CONCLUSIONS For the prevalence of LGR ≥ 0.5 mm an average increase of 5.3% was determined during ≈ 4.5 years of Herbst-MBA Tx plus retention. The highest incidence was seen for lower central incisors and upper right premolars (11.1/14.9%). The overall LGR mean magnitude increased by 0.05 mm. CLINICAL RELEVANCE Herbst-MBA Tx is a common approach for class II:2 malocclusions. Very little, however, is known regarding LGR development in respective patients.

中文翻译：

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II：2类错牙合患病率和Herbst-Multibracket矫治器治疗期间唇龈退缩的进展。

目的确定II级：2患者在Herbst-Multibracket矫治器（Herbst-MBA）治疗（Tx）加保留期间的患病率，发病率以及大小的唇龈退缩（LGR）变化。研究对象和方法德国吉森大学正畸科的所有II类：2类患者均完成了Herbst-MBA Tx（平均Tx年龄为15.6岁）。该队列经历了Herbst阶段（平均8.1个月）以及随后的MBA阶段（平均14.4个月）。从Tx之前和Herbst-MBA Tx之后加上保留≥24个月后评估研究演员。结果173例患者中有94例可获得可移植的Tx和保留后研究模型（总观察期53.5±10.3个月）。在有和没有完整记录的患者之间，关于Tx前LGR数据没有显着差异。LGR≥0.5 mm的牙齿患病率，Tx前为1.4％，保留后为6.7％。上颌第一磨牙和下中切牙的最高值确定为最高5.3％（Tx前）和20.2％（保留后）。计算出的发生率分别为4.7％（所有牙齿）和高达14.9％（右上前磨牙上方）和11.1％（下中切牙）（LGR≥0.5 mm）。LGR的总体平均强度在Tx之前为0.01 mm，保留后为0.06 mm。结论对于LGR≥0.5 mm的患病率，在约4.5年的Herbst-MBA Tx加保留期间，平均增加5.3％。下中切牙和右前磨牙的发生率最高（11.1 / 14.9％）。整体LGR平均幅度增加了0.05毫米。临床相关性Herbst-MBA Tx是II类的常用方法：2个错牙合。然而，关于各个患者的LGR发育知之甚少。