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• W2977017519 abstract "Background The use of dental implants has been an extremely relevant tool in oral rehabilitation. However, there are systemic conditions, such as osteoporosis, that may negatively influence the osseointegration process by decreasing bone mineral density. Modifications in the microtopography and surface of the implants, as well as the use of the Leukocyte Fibrin Rich Plasma (L-PRF), are strategies that have been used to increase bone healing around the implant. Aim/Hypothesis To evaluate, in osteoporotic rats, the bone repair around two implant surfaces (double acid etched=DAE or with the addition of nano-hydroxyapatite=NHA), associated or not to L-PRF, evaluating the histomorphometric parameters of Bone to Implant Contact (BIC) and Bone Area Fraction Occupancy (BAFO). Material and Methods Implants with 2 types of surface (DAE or NHA+ 24 implants of each) were installed in the tibias of osteoporotic rats. In 24 rats, L-PRF was obtained with blood collection by cardiac puncture and posterior centrifugation and inserted in the prepared bone site before implant insertion. The 48 rats were randomly divided into 4 experimental groups of 12 rats each- G1-DAE implants installed+ G2-NHA implants installed+ G3-DAE implants installed in association to L-PRF+ G4-NHA implants installed in association to L-PRF. All the implants measured 2.7 mm in length and 1.4 mm in diameter. The animals were euthanized 7 and 30 days (7d+30d) after implants placement (6 from each group period) and the specimens were histologically processed. Histomorphometrical parameters (BIC, in %+ and BAFO, in %) were evaluated. Data were assessed through analysis of variance + Tukey test and are presented as a function of mean ± standard deviation. Results For BIC, statistically significant differences were found between G4 7d (44.99 ± 13.06) versus G2 7d (25.34 ± 12.38) and G3 7d (28.86 ± 7.63) + in NHA rats, also between L-PRF (42.30 ± 12.88) versus control (30.63 ± 10.65) treatments+ after 7 days, L-PRF rats (36.92 ± 7.65) presented significant more BIC than control (26.90 ± 6.51) animals. For BAFO, there were statistically significant differences between G1 7d (31.31 ± 9.08) versus G2 7d (50.21 ± 10.190), between G3 7d (25.71 ± 8.98) versus G4 7d (64.18 ± 7.72) and between G3 30d (59.32 ± 9.31) versus G4 30d (76.31 ± 11.14) + in NHA rats, also between L-PRF (70.25 ± 6.56) versus control (55.42 ± 5.48) treatments+ after 30 days, L-PRF rats (67.82 ± 7.65) presented significant more BAFO than control (55.22 ± 6.56) animals. Intragroup analysis for BIC and BAFO showed statistically significant differences between 7d and 30d for DAE groups. Conclusion and Clinical Implications BIC and BAFO showed that the implant surface modified by the addition of nanometric scale hydroxyapatite, mainly associated to L-PRF, presented the highest values of the evaluated parameters in an impaired bone repair model (osteoporotic rats) when compared to the double acid etched surface. These results suggest that NHA surface implants + L-PRF treatment should be tested in challenging clinical situations, in human controlled trials." @default.
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• W2977017519 date "2019-09-01" @default.
• W2977017519 modified "2023-10-18" @default.
• W2977017519 title "Nanometric implant surface associated to L‐PRF: Histomorphometric study in osteoporotic rats" @default.
• W2977017519 doi "https://doi.org/10.1111/clr.26_13509" @default.
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