RESUMO
PURPOSE: To observe the effect of different prosthetic materials (polymethyl methacrylate [PMMA] and flowable composite [FC]) on marginal bone loss, pink esthetic score (PES), and cytokine levels (receptor activator of nuclear factor kappa-Β ligand [RANKL] and osteoprotegerin [OPG]). MATERIALS AND METHODS: A total of 46 patients (31 women, 15 men) were treated with immediate implant therapy after tooth extraction. For standardization, only the maxillary premolar tooth of each patient was restored, and also, both of the adjacent teeth were present in the dental arch. Provisional crowns were prepared before the surgery on patient models with two different materials (24 PMMA, 22 FC). Following the surgical procedure, provisional crowns were adjusted on polyetheretherketone (PEEK) abutments as nonfunctional in centric and eccentric movements. After the surgery, patients were evaluated monthly for 3 months. At each follow-up, periapical radiography was obtained by the parallel technique, and peri-implant crevicular fluid (PICF) was collected. Pink esthetic scoring was done. MBL was calculated for the mesial and distal sides separately. Cytokine levels were analyzed from PICF. Statistical analyses (Shapiro-Wilk, Mann-Whitney U, independent-samples t test, Wilcoxon t test, paired-samples t test, and Friedman two-way analysis of variance with Bonferroni correction) were completed (α = .05). RESULTS: PES was increased significantly within groups (P < .01). However, there was no statistically significant difference between groups. According to the Mann-Whitney U test, no significant difference was found for the MBL (P > .05). When the RANKL/OPG values were evaluated within the group by using the Friedmann two-way analysis of variance test, no significant difference was found (P > .05). CONCLUSION: Similar pink esthetics, cytokine levels, and bone loss can be achieved using a protocol including immediate implants, particle grafts, soft tissue graft, PEEK abutments, and provisional restorations fabricated using PMMA and FC.