The aim of this study is to determine the relative abundances of the different bacterial phyla and families in the microbiota present on the surface of PEEK implant-supported provisional abutments compared to titanium implant-supported provisional abutments, as well as the effect of both materials on the presence of antibiotics resistance genes.
The use of provisional abutments is mandatory during the restorative phase of any implant based oral rehabilitation. The introduction of poly-ether-ether-ketone (PEEK) for the manufacturing of provisional abutments as an alternative to conventional titanium abutments has opened the restorative spectra, offering the clinician and the patient better aesthetics and adhesive outcomes than its predecessor. However, there is to date no clarity on the impact of PEEK on the bacterial growth and the specificity of the microbiota on the abutment surface. Therefore, the present study aims to determine the relative abundances of the different bacterial phyla and families in the microbiota present on the surface of PEEK and titanium implant-supported provisional abutments, as well as the effect of both materials on the presence of antibiotics resistance genes. Study Hypotheses: * H1: The characteristics of the bacterial microbiota present at the connection area of implant-supported provisional abutments are dependent upon the abutment material. * H2: An increased presence of antibiotic resistance genes is found in the bacterial microbiota on titanium provisional abutments when compared to that found on PEEK abutments. The study uses a metagenomic approach based on the characterization of the bacterial communities, as well as on the sequencing of the 16S gene, and on the other hand, on the sequencing of the high-throughput (HTS) of the whole genome, for variations of the antibiotic resistance genes. Sample retrieval will be conducted prior to implant placement, at the adjacent teeth gingival sulcus (t0), and two months after provisional abutment (and crown) connection (t1), from the retrieved abutments. Patient allocation in the "PEEK" or "Titanium" groups will be randomized. Intra- and interpatient comparisons will be conducted. Statistical analyses include two-way ANOVA and Tukey's post-hoc test, at p\<0.05.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
BASIC_SCIENCE
Masking
DOUBLE
Enrollment
4
The effect of the provisional abutment material on the characteristics of the bacterial microbiota will be assessed by using PEEK (experimental) or Titanium (active comparator) provisional abutments.
Department of Restorative Dentistry, Faculty of Dentistry, University of Concepcion
Concepción, Bio Bio, Chile
Changes in the Number of Operational Taxonomic Units (OTUS)
Changes in the Number of Operational Taxonomic Units (OTUS) observed after the two months evaluation period will be assessed using UniFrac metrics. The weighted UniFrac distances will be used to perform a principal coordinate analysis (PCO).
Time frame: Baseline (prior to abutment insertion) and two months after abutment insertion.
Changes in Antibacterial Resistance Genes (ARG)
Changes in the ARG of the microbiota will be determined using the whole genome sequencing using the MiSeq Illumina method.
Time frame: Baseline (prior to abutment insertion) and two months after abutment insertion.
Changes in the number of bacterial species
Changes in the bacterial microbiota richness will be evaluated using a bias corrected Chao 1 richness estimator and the Shannon diversity index.
Time frame: Baseline (prior to abutment insertion) and two months after abutment insertion.
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