Volumetric and linear assessment of maxillary, mandibular and zygomatic bone as donor sites for alveolar ridge augmentation using CBCT: A cross sectional study

Objective: To analyze preoperative CBCT assessment of intraoral donor sites (symphysis, ramus buccal shelf of bone, zygomatic buttress and maxillary tuberosity) for purpose of autogenous block graft. Materials and Methods: Twenty (5 for each graft) participants were included in the study, (informed consent was signed by each participant) Participants were recruited according to certain eligibility criteria. Results: The measurements of the block grafts showed that there was a significant difference between different sites (p<0.001). The highest value was found in mandibular symphysis (1.56±0.44), followed by mandibular ramus (0.99±0.19), then zygomatic buttress (0.49±0.06), while the lowest value was found in maxillary tuberosity (0.31±0.07). Post hoc pairwise comparisons showed value of mandibular symphysis to be significantly higher than other sites (p<0.05). In addition, they showed mandibular ramus value to be significantly higher than values of zygomatic buttress and maxillary tuberosity (p<0.05). Conclusion: According to this study, mandibular donor sites showed larger segmented pieces and larger volumes than their maxillary counterparts. For multiple missing teeth, the most appropriate block grafts will be the symphysis and ramus spanning the largest mesio-distal dimension. In terms of implant stability, the rami and maxillary tuberosities showed the largest thicknesses, which will ultimately help in implant stability