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Hyaluronan Dermal Fillers: Efforts Towards a Wider Biophysical Characterization and the Correlation of the Biophysical Parameters to the Clinical Outcome

Authors La Gatta A, Schiraldi C, Zaccaria G, Cassuto D

Received 20 June 2019

Accepted for publication 20 November 2019

Published 28 January 2020 Volume 2020:13 Pages 87—97


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 3

Editor who approved publication: Dr Jeffrey Weinberg

Annalisa La Gatta,1 Chiara Schiraldi,1 Giovanna Zaccaria,2 Daniel Cassuto2

1Department Experimental Medicine, Section of Biotechnology, Medical Histology and Molecular Biology, School of Medicine, University of Campania “L. Vanvitelli”, Naples 80138, Italy; 2Private Practice, Milan, Italy

Correspondence: Chiara Schiraldi via De Crecchio 7, Naples 80138, Italy
Tel +39 081 5667546
Fax +39 081 5665897
Daniel Cassuto Dr. Daniel Cassuto, Piazza V Giornate 1, Milan 20129, Italy
Tel +39 02 36723960

Introduction: Hyaluronic Acid (HA) fillers are among the most used products in cosmetic medicine. Companies offer different formulations to allow full facial treatment and/or remodeling. Gels are being studied to establish the biophysical properties behind the specific clinical use and a correlation between the gel biophysical properties and their clinical performance. Clinicians’ awareness is growing about the potential benefit deriving from such biophysical characterization.
Aim: The Aliaxin® line of HA dermal fillers is the object of this study. The study aimed to widen the biophysical characterization of these gels by investigating a variety of properties to better support their optimal use. Further, we aimed to provide some clinical findings to gain a deeper insight into the correlation between filler features and clinical outcome.
Methods: The four gels of the line were investigated, for the first time, for their cohesivity and stability to Reactive Oxygen Species (ROS). Additional secondary rheological parameters; evidence of relative water-uptake ability; and some clinical findings on product safety, palpability and duration of the aesthetic effect are provided.
Results and conclusion: The gels proved highly cohesive and sensitive to ROS action with stability declining with the decrease in the overall gel elasticity. The G* and complex viscosity values at clinically relevant frequencies and gel water-uptake ability are consistent with the relative clinical indication related to gel projection and hydration capacity. Clinical outcomes showed the safety of the products and a perception of palpability well correlating with the cohesive/viscosity properties of the gels. A similar duration of the aesthetic effect (up to 1 year) was observed despite the diverse in vitro gel stability. The results broaden our knowledge of these gels and may contribute to optimize their clinical use towards the improvement of patient safety and satisfaction. Initial clinical observation indicated that gel biophysical properties allow for a reliable prediction of gel palpability, while in vitro data on gel stability cannot be related to the duration of the observed skin improvement. The latter finding further corroborates the idea of a skin restoration process activated by the gels besides the physical volumetric action.

Keywords: dermal filler, degradation, cohesivity, palpability

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