| Summary: | This study involved a randomized clinical trial that included 140 patients. Alveolar ridge preservation was performed with xenografts. Sealing in the control group consisted of a collagen membrane versus cyanoacrylate in the test group. The dental implants were placed immediately after extraction. The variables were evaluated at 3, 12, and 18 months of follow-up. Pearson’s chi-squared test was used for qualitative variables and the Student t-test for related samples was used for quantitative variables. The change in buccolingual alveolar bone width was significantly greater in the CMX group than in the CX group after three months (<i>p</i> < 0.005). However, significance was not reached at the other follow-up timepoints (<i>p</i> > 0.005). CAL showed significantly greater values in the CMX group than in the CX group (<i>p</i> < 0.005), and MBL proved greater in the CMX group than in the CX group, with <i>p</i> < 0.001. Five membrane exposures were recorded in the CMX group. Cyanoacrylate as a sealing method for alveolar ridge preservation seems to afford better clinical and radiological results than collagen membrane.
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