Background: This report is the second part of the previously published study on the impact of light/chemical hardening technology and a newly formulated composite graft material for crestal augmentation during immediate implant placement. Methods: Light-hardened poly-methyl-methacrylate, poly-hydroxyl-ethyl-methacrylate, and calcium hydroxide plus polyanhydride (PPCH+PA) composite graft), PPCH graft alone, PA graft alone, were compared to each other and to a no graft control group. All mandibular premolar teeth were extracted; a total of 48 implants were placed into sockets of the mesial roots in three minipigs. Crestal areas and intrabony spaces were randomly augmented with graft materials or left untreated. Distal sockets not receiving implants and the sockets of first molars (n=60) were randomly treated with one of graft materials or left empty. In addition, two molar sockets were treated with original PMMA/PHEMA and calcium hydroxide (PPCH) graft material. Quantitative microcomputed tomography (μCT) was used to assess alveolar bone structure and tissue compositions following crestal augmentations. Histological evaluations included descriptive histology to assess the peri-implant wound healing as well as histomorphometric measurements to determine bone-to-implant contact (BIC). Results: Although PPCH alone showed the least impact on trabecular bone formation, both trabecular and cortical bone measurements by μCT did not reveal any significant differences between the groups. Sites augmented with PPCH+PA resulted in significantly greater BIC surface than PPCH alone and no graft treated implants (p<0.05) histologically. Villanueva-stained sections showed complete bone formation between bone and implant surface in the PPCH+PA group, while sites without augmentation showed large gaps between bone and implant surfaces indicating a slower bone apposition and less BIC surface compared to all other groups. Similar to implant sections, all materials showed positive outcome on trabecular and cortical bone formation in extraction sockets with an intact crestal cortical bone. Conclusion: Histological evaluations supported the earlier findings on implant stability and function and confirmed that PPCH+PA provides a greater BIC contact with a well-organized implant-bone interface and is useful in crestal augmentation during immediate implant placement.