Instituto Transplantare, Belo Horizonte, Brazil.
Centro Goiano Transplante Capilar - CGTC, Goiânia, Brazil.
J Cosmet Dermatol. 2022 Nov;21(11):5977-5983. doi: 10.1111/jocd.15306. Epub 2022 Sep 2.
In follicular unit excision (FUE), the concept of depth control (DC) has been created to minimize the risk of hair follicle damage.
To analyze DC variation in different parts of the safe donor area of scalp; to propose Boaventura's new DC classification for hair restoration surgery using the FUE technique.
PATIENTS/METHODS: Thirty male patients underwent hair restoration surgery. The donor area was distributed into 14 zones, with the minimum depth required for at least three atraumatic extractions of the grafts. When the extraction was not successful, 0.5 mm was added until reaching three follicular units, determining the DC area.
Approximately 2000 extractions were performed on each patient to determine DC. For some areas, greater depth (2.54 ± 0.10 mm) was necessary. Fifty-eight percent of follicular units were extracted with 2.0 mm DC, and 3.8% required 3.5 mm DC. Thus, according to Boaventura's new classification for DC, grade I ≥ 2.00 mm, grade II from 2.1 to 3 mm, and grade III > 3.0 mm.
There is variability in the DC of follicular units within the different areas of the safe donor zone. Moreover, we have proposed a new DC classification, which would represent a valuable estimation of surgery demand.
在毛囊单位提取术（FUE）中，创建了深度控制（DC）的概念，以最大程度地降低毛囊损伤的风险。
分析头皮安全供区不同部位的 DC 变化；提出使用 FUE 技术进行毛发修复手术的 Boaventura 新的 DC 分类。
患者/方法：30 名男性患者接受了毛发修复手术。供区分为 14 个区，每个区至少需要 3 次无创伤性提取移植体，以确保所需的最小深度。当提取不成功时，增加 0.5mm，直到达到 3 个毛囊单位，确定 DC 区。
每个患者大约进行了 2000 次提取来确定 DC。对于一些区域，需要更大的深度（2.54±0.10mm）。58%的毛囊单位采用 2.0mm DC 提取，3.8%需要 3.5mm DC。因此，根据 Boaventura 的新 DC 分类，I 级≥2.00mm，II 级为 2.1-3mm，III 级>3.0mm。
在安全供区的不同区域内，毛囊单位的 DC 存在变异性。此外，我们提出了一种新的 DC 分类，这将是对手术需求的有价值的评估。
