Oral Biology Research

Table. 5.

The image findings of soft tissue filler

Filler CT findings MRI findings FDA approval (yr)
Collagen or collagen mixed with PMMA Fluid a. Low s. (T1), high s. (T2) 1981 (2006)
e-PTFE=Gore-Texa Intermediate a.
300–400 HU
Low s. (T1, T2) Mid-1990s
HA Nearly fluid a. Low s. (T1), high s. (T2) 2003
PLLA Soft-tissue a. - 2004
CaHAb Hyper a. (280–700 HU) Low–intermediate s. (T1, T2) 2006
Liquid silicone Similar or slightly higher a. than soft tissue High s. (T1), iso–hypointense s. (T2) Not approved
PAAG Nearly fluid a. Low s. (T1), high s. (T2) Not approved
Polyacrylamide Gel (PAAG) Nearly fluid a. low s. (T1), high s. (T2) not approved

CT, computed tomography; MRI, magnetic resonance image; FDA, US Food and Drug Administration; PMMA, poly-methylmethacrylate; e-PTFE, expanded polytetrafluoroethylene; PLLA, poly-L-lactic acid; HA, hyaluronic acid; CaHA, calcium hydroxyapatite; PAAG, polyacrylamide gel; a., attenuation; s., signal; HU, hounsfield unit; FDG-PET, fluorodeoxyglucose-positron emission tomography.

aNot included in the filler category specified by FDA, but FDA approved in 1995 as "Gore-tex facial implant" category. bFDG-PET image reveals hypermetabolic CaHA [16].

Oral Biol Res 2021;45:125~134 https://doi.org/10.21851/obr.45.03.202109.125
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