socket preservation using freeze‑dried bone allograft with and without plasma rich in growth factors in dogs

background: plasma rich in growth factors (prgf) and freeze‑dried bone allograft (fdba) are shown to promote bone healing. this study was aimed to histologically and histomorphometrically investigate the effect of combined use of prgf and fdba on bone formation, and compare it to fdba alone and control group. materials and methods: the distal roots of the lower premolars were extracted bilaterally in four female dogs. sockets were randomly divided into fdba + prgf, fdba, and control groups. two dogs were sacrificed after 2 weeks and two dogs were sacrificed after 4 weeks. sockets were assessed histologically and histomorphometrically. data were analyzed by kruskal–wallis test followed by mann–whitney u‑tests utilizing the spss software version 20. p < 0.05 was considered statistically significant. results: while the difference in density of fibrous tissue in three groups was not statistically significant ( p = 0.343), the bone density in grafted groups was significantly higher than the control group ( p = 0.021). the least decrease in all socket dimensions was observed in the fdba group. however, these differences were only significant in coronal portion at week 4. regarding socket dimensions and bone density, the difference between fdba and fdba+prgf groups was not significant in middle and apical portions. conclusion: the superiority of prgf+fdba overfdba in socket preservation cannot be concluded from this experiment. key words: allografts, platelet, rich plasma, socket graft