Aim. To evaluate, with three-dimensional analysis, the effectiveness of alveolar ridge preservation (ARP) after maxillary molar\nextraction in reducing alveolar bone resorption and maxillary sinus pneumatization when compared to unassisted socket healing.\nMethods. Patients were included in the study following inclusion criteria and underwent minimally traumatic maxillary molar\nextraction followed by ARP using synthetic nanohydroxyapatite (Fisiograft Bone, Ghimas, Italy) (test group) or unassisted socket\nhealing (control group). Cone-beamcomputerized tomographies (CBCT) were performed immediately after tooth extraction (T0)\nand 6 months postoperatively (T1). CBCTs were superimposed by using a specific software (Amira, Thermo Fisher Scientific, USA)\nand the following items were analyzed in both groups: (i) postextractive maxillary sinus floor expansion in coronal direction and\n(ii) postextractive alveolar bone dimensional changes (both vertical and horizontal). All data were tested for normality and equality\nof variance and subsequently analyzed by independent samples T-test andMannâ??Whitney test.
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