No abstract

A static magnetic field generated by neodymium–iron–boron (NdFeB) magnets placed in the inner cavity of dental implants can enhance bone regeneration in rabbits. It is, however, unknown whether static magnetic fields support osseointegration in a canine model. We therefore determined the potential osteogenic effect of implants carrying NdFeB magnets inserted in the tibia of six adult canines in the early stages of osseointegration. Here, we report that after 15 days of healing, magnetic and regular implants showed a high variation with a median new bone-to-implant contact (nBIC) in the cortical (41.3% and 7.3%) and the medullary (28.6% and 44.8%) region, respectively. Consistently, the median new bone volume/tissue volume (nBV/TV) in the cortical (14.9% and 5.4%) and the medullary (22.2% and 22.4%) region were not significantly different. One week of healing only resulted in negligible bone formation. These findings suggest that considering the large variation and the pilot nature of this study, magnetic implants failed to support peri-implant bone formation in a canine model.

This case report presents a novel approach for root coverage of multiple gingival recessions with a volume-stable collagen matrix functionalized with injectable platelet-rich fibrin (i-PRF). A patient with multiple gingival recessions in the anterior maxilla was submitted to root coverage by coronally advanced flap with split–full–split incisions. Blood collection was performed before surgery and i-PRF was obtained after centrifugation (relative centrifugal force (RCF) 400 g, 2700 rpm, 3 minutes). A volume-stable collagen matrix was soaked with i-PRF and applied as a substitute for autogenous connective tissue graft. A mean root coverage of 83% was observed after a 12-month follow-up period, and only slight modifications were detected in a 30-month follow-up consultation. The association of a volume-stable collagen matrix with i-PRF successfully treated multiple gingival recessions with reduced morbidity since a connective tissue collection was avoided.

Background : Dental implant (DI) treatments have been reported with a high survival rate. However, there are complications that affect hard and soft tissues. Health are characterized by no signs of inflammation (IF) and bleeding on probing (BOP) and there may be health around the DI with normal bone support or reduced. Mucositis and peri-implantitis (PI) are characterized by BOP and visual signs of IF, and PI is defined as a pathological condition associated with plaque, accompanied by MBL. Aim/Hypothesis : Clinically assess the prevalence of health, mucositis, PI, and radiographically, MBL for implant correlating the transmucosal portion of height prosthetic abutment (TPHPA) used, in rehabilitated patients with fixed full-arch implant-supported (FFAIS) with internal conical connection. Materials and Methods : Patients who had a FFAIS with conical internal connection for more than one year in function were included, totaling 107 implants, in 20 prostheses with transmucosal portion of the height of the prosthetic abutment (0.8; 1.5; 2.5; 3.5 mm). Peri-implant diseases were diagnosed based on an established case definition, that is, marginal radiographic bone loss ≥ 3 mm, BOP and / or probing depth (SD) ≥ 6 mm. For radiographic analysis, a horizontal line was drawn in the prosthetic connection, and the vertical lines were drawn as parallel as possible to a reference line (long axis of the implant). To analyze progressive MBL, an average was performed between mesial and distal bone changes from the baseline to the follow-up time. The chi-square test was used to verify the association between TPHPA and diagnosis. The ANOVA One-Way statistical test was used to compare MBL with the diagnosis and TPHPA. To find the differences between the groups, the post hoc test was performed using the Tukey test. Results : Combining the diagnosis (healthy, mucositis and peri-implantitis) with TPHPA 107 FFAIS with internal conical connection, it is observed that 43.8% of the implants with 0.8 mm TPHPA, were diagnosed with peri-implantitis (PI) identifying considerably decrease in IP with larger TPHPA sizes. When compared, the diagnosis with marginal radiographic bone loss (MBL) mean for implant, a statistical difference (P < 0.05) was observed between healthy patients (mean MBL of-1.56 mm) with patients diagnosed with PI (mean MBL of-2.77 mm). Regarding the comparison between the analyzes carried out with the TPHPA and the MBL for implant, it was possible to identify that there was a P < 0.05 between the TPHPA height with a 0.8 mm height with an mean MBL of-2.72 mm, and the 2.5 mm TPHPA-1.31 mm MBL. Conclusions and Clinical Implications : It was possible to observe that implants with prosthetic components with a transmucosal portion of the height of the prosthetic abutment of 0.8 mm were diagnosed mainly with peri-implantitis and, consequently, there was a greater marginal bone loss, suggesting caution in the planning of implants and prostheses, but also considering the difficulty of cleaning in fixed full-arch