Brazilian Hydroxyapatite Implant

Abstract

The Brazilian implant is pure HA that appears solid but has randomly arranged channels as well as a microporous architecture that allows vascularization to its center. It is heavier than other available HA implants and has the presence of an unidentified foreign material within it. Although this implant is less expensive and does not require a costly manufacturing process, the structural characteristics of the material do not offer any theoretical or clinical advantages. The implant is only available in Brazil at this time.

Double-setting alpha-tricalcium phosphate cement provided with interconection channels in rabbits after enucleation: A potential implant for the anophthalmic socket

“…This fact was not noted in the present study, as the electron microscope scan of the sphere revealed only surface micropores of 0.5 to 5.6µm, which did not interconnect. Tissue infiltration can be observed in micropores bigger than 5µm, as observed in the evaluation of the national hydroxyapatite, which permitted the migration of fibrovascular tissue to the interior of the sphere in micropores of 5-10 µm (Jordan et al, 2000). It was observed that even in the absence of interlinked pores, the presence of channels for interconnection made the infiltration of host tissue possible, which contributed to the absence of complications reported by other studies, such as ocular discharge, pain, exposure, infection, dehiscence of the sutures and extrusion (Molteno et al, 1973;Toft et al, 2010;Kanamura et al, 2012).…”

“…The majority of implants reported, such as the Bio-Eye, the FCl 3 , the Alumina and the Molteno M-Sphere have multiple interlinked pores, which permit the integration of fibrovascular tissue from the host, which reduces the risk of extrusion (Jordan et al, 2000;Jordan et al, 2002). This fact was not noted in the present study, as the electron microscope scan of the sphere revealed only surface micropores of 0.5 to 5.6µm, which did not interconnect.…”

“…The implants were weighed and the external surfaces were evaluated. In addition, attempts were made to break them between the thumb and forefinger (the pinch test), and the ease with which they could be penetrated with a 25x7 needle was ascertained (Jordan et al, 2000). After fragmentation, the internal surface was evaluated.…”

“…The measuring bar was photographed simultaneously and was 500, 10 and 10µm, respectively. A compass was used to measure and convert the size of the pores and crystals (Jordan et al, 2000;Oriá et al, 2006).…”

Condutas para reparação da cavidade anoftálmica no Brasil

“…Surgiram também as hidroxiapatitas sintéticas, usadas inclusive aqui no Brasil (8,9) . Outro tipo de biomaterial, o polietileno poroso, pas sou a ser disponível para uso em cavidade anoftálmica desde meados de 1991 (10) .…”