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1.
J Oral Implantol ; 2024 Oct 16.
Artigo em Inglês | MEDLINE | ID: mdl-39410828

RESUMO

PURPOSE: To examine the impact of abutment screw head sizes on preload stability when secured to a standard external hex implant under oblique compressive forces. MATERIALS AND METHOD: Fifteen metal crowns were divided into three equal groups. The first group had five angulated cemented crowns connected to a 3 mm tall straight hexagonal abutment with an external hex abutment screw. The second and third groups each had five straight cemented crowns attached to a tapered abutment with flat slotted and internal hex abutment screws, respectively. Samples were subjected to a static cyclic load until failure. Kruskal-Wallis H, Dunn's, and one-way ANOVA with Tukey HSD tests were performed. RESULTS: Cemented straight crown supported by an angled abutment connected to implants with flat slotted and internal hex abutment screw heads failed at an average of 4.24 x 106 cycles ± 3.31 SD and 12.67 x 106 cycles ± 5.47 SD, respectively. Cemented angled crowns supported by a straight abutment connected to identical implants with an external hex abutment screw survived 18.02 x 106 cycles ± 4.49 SD. Periotest value (PTV) rate of change increased at a higher rate in crowns supported by angled abutments compared to straight abutments (p < 0.05). No cement failure was observed. CONCLUSION: Under the experimental conditions, larger abutment screw head sizes demonstrated greater stability of the abutment screw joint interface. Based on the in vitro findings, no cement failure was observed between the cemented crown and abutment connection. Future research with standardized comparative setups and larger sample sizes is needed.

2.
Pharm Nanotechnol ; 11(2): 208-216, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-36617708

RESUMO

INTRODUCTION: Dental implant failure due to periodontal disease caused by anaerobic pathogens occurs, especially in the first year of implant placement. The aim of this clinical trial study was to compare the antibacterial effect of tetracycline gel and gel containing tetracyclineloaded mesoporous silica nanoparticles (MSNs) in the gingival crevice fluid of the implantabutment junction as a randomized clinical trial study. MATERIALS AND METHODS: Fourteen patients applying for implants in the posterior mandibular region were included in the study. During the uncovering session, tetracycline gel and gel containing tetracycline-loaded MSNs were placed in two implants and no substance was placed in the control group. Then, in three sessions, including molding, prosthesis delivery, and one month after delivery, the patient's gingival fluid was sampled and the number of bacteria in the gingival fluid was measured by colony-forming units (CFU/mL). RESULTS: The results of this study showed that in all three stages of sampling, the use of tetracycline gel and gel containing MSNs loaded with tetracycline significantly reduced the CFU/mL of gingival crevice fluid compared to the control group. Tetracycline-loaded MSNs gel showed significantly lower CFU/mL than tetracycline gel. The release of tetracycline from nanoparticles keep continue for a longer time compared to tetracycline gel. CONCLUSION: The use of nano-based delivery systems containing antibiotics inside the implant fixture can reduce the bacterial count of the implant-abutment junction and then improve implant stability.


Assuntos
Nanopartículas , Tetraciclina , Humanos , Antibacterianos/farmacologia , Bactérias , Próteses e Implantes
3.
Bioinformation ; 19(4): 502-505, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-37822813

RESUMO

With the advent of various implant abutment junctions, the ultimate aim is to develop a precise implant abutment junction with negligible micro-leakage. However precise the mechanical connection is, there seems to be a negligible amount of micro-leakage that is present that can be addressed with the help of sealing gel. This study aims to assess the micro-leakage between the neo-sealing gel and the commercially available implant sealing gel. The study was conducted on implants (n=15) with internal hex connections, group 1 (No gel, n=5), group 2 (Neo gel, n=5) and group 3 (commercial gel, n=5). Mean dE*ab values of 0.28± 0.02, 0.04± 0.01 and 0.17±0.01 were noted for the 3 groups, and there was statistically significant difference between the 3 groups (p≤0.05). The study suggests that the neo sealing gel may be a promising material to prevent bacterial ingress and micro-leakage at the implant abutment junction.

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