识别浅筋膜腱膜系统的区域性黏弹性特性。

Identifying Regional Viscoelastic Properties of the Superficial Muscular Aponeurotic System.

机构信息

Department of Plastic Surgery, University of Texas Southwestern, Dallas, TX.

出版信息

Aesthet Surg J. 2021 Feb 12;41(3):277-283. doi: 10.1093/asj/sjaa140.

DOI:10.1093/asj/sjaa140

PMID:32463437

Abstract

BACKGROUND

Suspension of the superficial muscular aponeurotic system (SMAS) is generally believed to be necessary in facelift surgery. Although many techniques have been suggested, all rely on the viscoelastic properties of the SMAS.

OBJECTIVES

The aim of this study was to determine the viscoelastic properties of bursting strength, stress relaxation, and creep in the lateral, mid-cheek, and medial regions of the SMAS.

METHODS

The viscoelastic properties of the SMAS were determined in 12 cadaveric hemifaces. Lateral SMAS was classified as the SMAS overlying the parotid gland; mid-cheek SMAS as anterior to the parotid and overlying the masseter muscle; and medial SMAS as including tissue extending medial from the lateral canthus and ending at the nasolabial fold.

RESULTS

The 3 SMAS regions showed significantly different bursting strengths: 38.9 N for the lateral SMAS, 26.7 N for the mid-cheek SMAS, and 11.9 N for the medial SMAS (P < 0.0001). Stress relaxation was similar in all vertical regions with measurements of 54% in the lateral, 48% in the mid-cheek, and 59% in the medial SMAS. Creep was found to be similar in the lateral and mid-cheek SMAS with values of 18% and 19%, respectively. The medial SMAS was noted to have a higher creep at 22%.

CONCLUSIONS

The lateral SMAS has a stronger bursting strength than the mid-cheek and medial SMAS. Creep appears to be lower in the lateral and mid-cheek SMAS. Stress relaxation appears to be similar in all 3 vertical regions.

摘要

背景

悬吊浅表肌肉腱膜系统（SMAS）通常被认为是面部提升手术所必需的。尽管已经提出了许多技术，但所有技术都依赖于 SMAS 的粘弹性。

目的

本研究旨在确定 SMAS 的抗张强度、应力松弛和蠕变的粘弹性特性，分别位于 SMAS 的外侧、中颊和内侧区域。

方法

本研究对 12 具尸体半侧面部进行了 SMAS 的粘弹性特性研究。外侧 SMAS 被定义为覆盖腮腺的 SMAS；中颊 SMAS 位于腮腺前方并覆盖咬肌；内侧 SMAS 包括从外眼角向内侧延伸并止于鼻唇沟的组织。

结果

3 个 SMAS 区域的抗张强度有显著差异：外侧 SMAS 为 38.9N，中颊 SMAS 为 26.7N，内侧 SMAS 为 11.9N（P<0.0001）。所有垂直区域的应力松弛都相似，外侧为 54%，中颊为 48%，内侧为 59%。发现外侧和中颊 SMAS 的蠕变相似，分别为 18%和 19%。内侧 SMAS 的蠕变较高，为 22%。