Genotoxicity Clinical Trial
Official title:
Genotoxicity Assessment of Dental Implants in Gingival Epithelial Cells
Due to the strong correlation between genotoxicity and carcinogenesis, it is necessary to
clarify the potential genotoxic effects of titanium dental implant systems. As most dental
materials release small amounts of several elements into the oral cavity, proper regulations
have to guarantee that the concern from genotoxicity/mutagenicity of dental materials is
annulated or at the lowest possible level. Thus, further biocompatibility records are needed
in order to evaluate the comprehensive risks of these compounds. In a view of the
above-mentioned data, the aim of this in vivo study is to evaluate genotoxic and cytotoxic
potential of implants and gingiva formers from two different implant systems in gingival
epithelial cells.
Exfoliated gingival cells will be taken from 80 participants before and after 90 days of
dental implant insertion, and 21 days following gingiva former placement. DNA damage will be
analyzed using the micronucleus test. Tested dental implants will be Ankylos and Dentium,
with corresponding gingival former.
Patients are divided into two groups depending on the dental implant system used in the
therapy. Ankylos dental implants (Dentsplay Sirona, Charlotte, USA) are used in the first
group of patients and Dentium SuperLine (Dentium Co., Seoul, Korea) in the second group.
The implants are placed in accordance with each implant system manufacturer's instructions
and the treatment were performed according to the patient's standards and indications.
Surgical procedures on all patients are performed by the same operator with the same surgical
approach, protocol and instrumentation.
The surgeries are performed under local anesthesia and systemic antibiotics were given
according to standard procedure. To ensure post-surgical oral hygiene, patients are advised
to rinse the oral cavity with chlorhexidine until the day of sutures' removal. The sutures
are removed10 day after implantation. The implants are healing by being submerged for 12
weeks based on the surgeon's clinical judgment, indications given and the need and preference
of the patients. After healing, gingiva formers are placed.
Sample collection and a micronucleus assay in gingival epithelial cells To reduce individual
variations, patients are observed longitudinally and each subject is served as their own
control. Samples of gingival epithelial cells are collected from each participant's
implementation site using the swab technique at three different time points: a control swab
is taken just before the placement of the dental implant (T0); the second swab is taken 90
days after implantation meaning immediately before placement of the gingiva former (T1); and
the third swab is taken 21 days after placement of the gingiva former (T2).
One hour before the sampling, the participants abstain from consuming any food and drinks.
After rinsing of the oral cavity 3 times with tepid water to remove exfoliated cells, a T0
swab is taken by gently brushing the gingiva around place indicated for implant placement and
later T1 and T2 around implant with a cytobrush (Cytobrush Plus; GmbH. Dietramszell-Linden,
Germany). The samples are subsequently applied to coded laboratory glass slides.
The cells applied to microscopic slides are allowed to air-dry and fixed in methanol (80%
v/v) at 4°C for 20 minutes. Staining is conducted with 5% Giemsa solution for 10 minutes.
Afterward, the slides are rinsed with aqua distillate and air dry. The slides are examined
under Olympus CX40 light microscope (Olympus. Tokyo. Japan) with 400× magnification, and each
micronucleus and other nuclear anomalies are additionally verified under 1000× magnification.
Two replicate slides are prepared for each subject and 1000 epithelium cells per preparation
were analyzed for each sampling time.
Nuclear anomalies, such as micronucleus, karyorrhexis (nuclear disintegration indicating
apoptosis), karyolysis (dissolution of the nucleus mostly indicating necrosis and apoptosis),
pyknosis (nuclear shrinkage due to apoptosis), condensed chromatin (DNA complexed with
proteins and apoptosis), nuclear buds (precursors of micronuclei, or high density of DNA
repair complexes) and broken eggs (nuclei that appear cinched, binucleated cells (indicating
impaired velocity of cell proliferation)) are estimated and qualified.
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