Colonization dynamics of subgingival microbiota in recently installed dental implants compared to healthy teeth in the same individual: a 6-month prospective observational study

Abstract Objectives To evaluate the colonization dynamics of subgingival microbiota established over six months around newly installed dental implants in periodontally healthy individuals, compared with their corresponding teeth. Methodology Seventeen healthy individuals assigned to receive single dental implants participated in the study. Subgingival biofilm was sampled from all implant sites and contralateral/ antagonist teeth on days 7, 30, 90, and 180 after implant installation. Microbiological analysis was performed using the Checkerboard DNA-DNA hybridization technique for detection of classical oral taxa and non-oral microorganisms. Significant differences were estimated by Mann-Whitney and Friedman tests, while associations between implants/teeth and target species levels were assessed by linear regression analysis (LRA). Significance level was set at 5%. Results Levels of some species were significantly higher in teeth compared to implants, respectively, at day 7 ( V.parvula , 6 × 10 5 vs 3 × 105 ; Milleri streptococci , 2 × 10 6 vs 6 × 10 5 ; Capnocytophaga spp., 2 × 10 6 vs 9 × 10 5 ; E.corrodens , 2 × 10 6 vs 5 × 10 5 ; N. mucosa , 2 × 10 6 vs 5 × 10 5 ; S.noxia , 2 × 10 6 vs 3 × 10 5 ; T.socranskii , 2 × 10 6 vs 5 × 10 5 ; H.alvei , 4 × 10 5 vs 2 × 10 5 ; and Neisseria spp., 6 × 10 5 vs 4 × 10 4 ), day 30 ( V.parvula , 5 × 10 5 vs 10 5 ; Capnocytophaga spp., 1.3 × 10 6 vs 6.8 × 10 4 ; F.periodonticum , 2 × 10 6 vs 10 6 ; S.noxia , 6 × 10 5 vs 2 × 10 5 ; H.alvei , 8 × 10 5 vs 9 × 10 4 ; and Neisseria spp., 2 × 10 5 vs 10 6 ), day 120 ( V.parvula , 8 × 10 5 vs 3 × 10 5 ; S.noxia , 2 × 10 6 vs 0; and T.socranskii , 3 × 10 5 vs 8 × 10 4 ), and day 180 ( S.enterica subsp. enterica serovar Typhi, 8 × 10 6 vs 2 × 10 6 ) (p<0.05). Implants showed significant increases over time in the levels of F.nucleatum , Gemella spp., H.pylori , P.micra , S.aureus , S.liquefaciens , and T.forsythia (p<0.05). LRA found that dental implants were negatively correlated with high levels of S. noxia and V. parvula (β=-0.5 to -0.3; p<0.05). Conclusions Early submucosal microbiota is diverse and only a few species differ between teeth and implants in the same individual. Only 7 days after implant installation, a rich microbiota can be found in the peri-implant site. After six months of evaluation, teeth and implants show similar prevalence and levels of the target species, including known and new periodontopathic species.

Tratamento da peri-implantite com emprego de L-PRF: relato de caso clínico / Peri-implantitis treatment with adjunctive use of L-PRF: case report

Com o aumento do número de indivíduos reabilitados com implantes dentários, novas complicações clínicas estão surgindo, incluindo as doenças peri-implantares. Várias terapias conservadoras e cirúrgicas têm sido propostas para o tratamento da peri-implantite. Estas abordagens cirúrgicas podem ser complementadas com métodos regenerativos, nos quais poderiam ser englobadas as terapias com fibrina rica em plaquetas e leucócitos (L-PRF). Objetivo: O objetivo deste estudo é relatar um caso clínico de peri-implantite tratado com o emprego de L-PRF após 12 meses a partir da intervenção. Relato de caso: O paciente relatado apresentava três implantes instalados há 9 anos, que apresentavam médias de profundidade de sondagem e de nível clínico de inserção de 3,1 e 2,7 mm, respectivamente. O tratamento da peri-implantite consistiu em desbridamento com instrumentos manuais através de acesso cirúrgico e irrigados com clorexidina a 0,12%. Após estes procedimentos, os implantes receberam membrana de fibrina obtidas com a técnica para L-PRF. Após 12 meses, foi constatado redução das bolsas peri-implantares com redução de profundidade de sondagem para 2,3 mm e de nível clínico de inserção para 2 mm. No exame radiográfico, foi possível observar sinais radiográficos indicativos de preenchimento dos defeitos ósseos. Conclusão: O tratamento utilizado para tratar o caso de peri-implantite relatado, mecânico com acesso cirúrgico e uso de L-PRF, apresentou bons resultados clínicos e radiográficos aos 12 meses (AU)

Along with the increasing number of subjects receiving dental implants, new clinical complications are emerging, including peri-implant diseases. Different conservative techniques are being proposed to treat peri-implantitis. Such approaches include regenerative methods, in which leucocyte - and platelet - rich fibrin (L-PRF) is one of them. Aim: The aim of this study is to present a follow up of a clinical case of peri-implantitis treated with the use of L-PRF. Case report: The individual in this report had three dental implants installed 9 years before, presenting mean probing depth and clinical attachment level of 3.1 and 2.7 mm, respectively. The peri-implantitis treatment was performed by debridement of implants with manual instruments in a surgical approach, and irrigation with 0.12% chlorhexidine. After, implants received fibrin membrane obtained using the L-PRF method. At the 12 months follow up, it was observed a reduction in the probing depth and the clinical attachment level to 2.3 mm and 2 mm, respectively. Radiographic examinations showed indications of bone defect filling. Conclusion: The employed treatment to treat periimplantitis, mechanical with surgical approach and use of L-PRF, showed good clinical and radiographic results at 12 months of observation.(AU)