Evaluation of low intensity laser's action on silicone mammary implant pseudocapsules in rats.
OBJECTIVE
To evaluate the effect of low intensity laser on the pseudocapsule contraction that occurs around silicone implants.


METHODS
60 male rats divided in two experimental groups received a silicone implant in the subcutaneous of the dorsal region. Group I: animals received implants in the subcutaneous dorsal region and did not receive any treatment; Group II: animals received seven irradiation sessions with low intensity laser after they had received subcutaneous implants. Thirty, 60 and 180 days after the surgery, tonometric evaluation of the implants was conducted. After that, the animals were sacrificed, study material was removed and prepared for histological examination. The thickness of the pseudocapsule and the inflammatory reaction were morphometrically quantified. Data obtained were statistically analyzed using the Variance method, and Tukey's Test(P<0.0 5).


RESULTS
Group II animals had significant lower pressure. The histological study did not show a significant difference between the groups, but only a higher number of swollen vessels in Group II. The thickness of pseudocapsule around Group II's implants lower than in Group I.


CONCLUSIONS
The low intensity laser modify tissue's reparation process around the implants suggesting it may be useful to model contractures that are formed around silicone implants.
Palhares
Aristides
A
Department of Surgery and Orthopedic, Botucatu Faculty of Medicine, State University of Sao Paulo, Brazil. palhares@fmb.unesp.br
Schellini
Silvana Artioli
SA
Pellizzon
Claudia Helena
CH
Padovani
Carlos Roberto
CR
Dorsa
Patrícia
P
D000704:Analysis of Variance; D000818:Animals; D018427:Breast Implants; D003286:Contracture / Q000473:pathology / Q000517:prevention & control / Q000532:radiotherapy; D004195:Disease Models, Animal; D020007:Implants, Experimental; D028022:Low-Level Light Therapy; D008297:Male; D023421:Models, Animal; D011897:Random Allocation; D051381:Rats; D017208:Rats, Wistar; D012828:Silicones
D012828:Silicones