We present a case of bilateral agenesis of maxillary second premolars with severe alveolar atrophy, which has been treated by guided bone regeneration with a synthetic biomaterial based on hydroxyapatite and tricalcium phosphate (MG-Osteodrive) and with resorbable membrane (MGReguarde), together with bilateral maxillary sinus lift, deferred placement of implants and subsequent prosthetic restoration. Female patient, 28 years of age, non-smoker and with no relevant medical history.
In this case we have used MG Osteodrive (Mozo-Grau) in its cancellous granule presentation, with a grain size of 500-1000 m per particle and composed of hydroxyapatite and tricalcium phosphate, with a totally synthetic manufacturing process. This biomaterial is easy to manipulate, according to the operator’s experience, as well as having a relatively short resorption time, three to six months (Bifano et al. 1998). The membrane, MG Reguarde (Mozo-Grau), is manufactured from collagen fibres originating from bovine Achilles tendons and has a resorption time of around six months (McNeil et al. 1994) and a consistency and clinical manipulation similar to other resorbable membranes.
After eight months of maturation of the newly formed bone tissue and after a control x-ray, the edentulous segments are addressed again removing the fixing microscrews and observing a newly formed bone tissue of mature and consistent appearance. The implants,
MG InHex (3.75 x 13 right side and 4.25 x 13 left side), are placed with a 40 Ncm insertion torque.
The use of allografts based on fully synthetic hydroxyapatite and tricalcium phosphate seems to achieve clinical results similar to those obtained with other reference biomaterials in guided bone regeneration and bilateral maxillary sinus lift in cases of severe alveolar atrophy.