Tikrit Journal for Dental Sciences

The current research is aimed to study the corrosion behavior
and mechanism of Co-Cr-Mo alloy fabricated by powder
metallurgy route in Ringer\\\'s solution with 7.4 and 37oC for
pH and temperature values, respectively.
The research was done by using a potentiostat to obtain the
potentiodynamic and cyclic polarization to measure and
calculate some significant parameters of the alloy corrosion.
The cyclic polarization curve is indicated the resistance of the
fabricated samples to the pitting and crevice corrosions.
Optical, SEM and SEM-Mapping observations were revealed
that the corrosion of the tested alloy was due to inter-particle
and inter granular corrosion.

Acute Myocardial Infarction (AMI), is the major cause of
mortality and morbidity. There is substantial evidence that
oxidative stress plays the major role in the atherosclerotic
process. This study was aimed to evaluate the levels of
salivary malondialdehyde (MDA), total antioxidant capacity
(TAC) and non-enzymatic antioxidants (Vitamin C and
Vitamin E) in AMI patients. Materials and methods: Sixty
AMI patients (35 Males and 25 Females) with mean age of 54
± 6.7 years and sixty control subjects with mean age 55 ± 6.2
years were incorporated in this study. Un stimulated saliva
were collected from each subject in both groups.
Malondialdehyde, and Total Antioxidant Capacity, Vitamin C
and
Vitamin E levels in saliva were estimated
spectrophotometrically. SPSS computer software was used
for data analysis. Results: Salivary MDA and TAC was
significantly elevated in AMI patients compared with
controls, while Vitamin C and Vitamin E were significantly
decreased in AMI patients. Conclusions: Oxidative stress was
increased in saliva of AMI patients, raised saliva MDA and
TAC serve as marker of detecting chronic inflammation or be
elevated as a consequence of oxidative stress in AMI patients.
It may be taken in consideration that the saliva is so important
tool in evaluation of lipid peroxidation and antioxidant agents
to confirm the diagnosis of certain diseases.

Rheumatoid arthritis (RA) is a chronic systemic inflammatory
autoimmune disease that preferentially affects diarthrodial
joints. Oxidative stress is elevated in RA patients implying
reactive oxygen species (ROS) are possible mediators of
tissue damage. Assess the level of total antioxidant capacity
(TAC), malondialdehyde (MDA), and non-enzymatic
antioxidants (vitamin E, and C )in the saliva of in patients
with rheumatoid arthritis(RA). For the realization of our goals
we included sixty rheumatoid arthritis patients (RA) (21
female and 39 male) who were fulfilling the American
College of Rheumatology and European League Against
Rheumatism 2010 revised criteria for classification of RA
,picked randomly, at the age from 25-57 years, and 60 as age
matched control group, who attended to Tikrit Teaching
Hospital / Tikrit / Iraq during the period from January 2017 to
March 2018. Stimulated saliva specimens were collected at
the
morning.
TAC of saliva was evaluated by
spectrophotometric assay. Statistical comparisons were
performed using Student’s t-test, by SPSS 13. Levels of
salivary pH, flow rate, TAC, vit E and C were decreased
significantly, whereas the salivary level of MDA were
increased significantly in RA patients when compared with
healthy controls. There was an increased oxidative stress and
a low antioxidant status in patients with RA. These changes
are probably due to efforts for reducing lipid peroxidation and
hence to lower tissue damage.

The aim of the present study is to investigate salivary
lipocalin-2 levels as well as C-reactive protein (CRP) in
women with and without polycystic ovary syndrome (PCOS).
Lipocalin-2 levels and C-reactive protein were measured in
104 women within the age group of (20 – 29) years were
divided into two groups. Group I consisted of 55 diagnosed
female patients of PCOS and Group II comprised of 49
female age matched control group with normal menstrual
cycles. Highly significant differences were found using t-test
in inter group comparison. Levels of lipocalin-2 in PCOS
group were decreased significantly compared to the control
group (p ˂ 0.05), while the salivary level of CRP were
increased significantly in the PCOS group (p ˂ 0.05). Salivary
levels of lipocalin-2 were found to be low whereas CRP were
high among women with PCOS.
It was suggested that the measurement of salivary lipocalin-2
and CRP may be specific method for making a diagnosis of
women with polycystic ovary syndrome.

Background: one of the requirements of long term dental
implant success lies within the implant structure and bone-
implant interface ability to cope with functional stress. Dental
implant ability to withstand different occlusal loads optimizes
implant-supported prosthesis function, minimize stress over
the surrounding bone, improve osseointegration and reduce
the required period for implant loading. One of the areas of
research on implant geometry is the thread design. Threads
increase initial bone contact, enhance implant stability,
maximize implant surface area with subsequent improvement
of osseointegration. Recently, Fin Thread (FT) and Modified
Fin Thread designs (IBS®) have been introduced. These
designs on TiG5 dental implant did not seem to receive
adequate attention in the current literature. Methods: four
dental implant models (Modified Fin Thread, Fin Thread, V
shaped and Buttress designs) of TiG5 were tested using FEA
for stress distribution using normal and extreme static
occlusal loads on 0, 15 and 25ο angles. Results: Modified Fin
Thread (MFT) design and Fin Thread (FT) design showed
almost uniform stress distribution compared to other models
under normal occlusal load. However, MFT design showed
better stress distribution with no cortical bone involvement in
overloaded occlusal stress (200 and 400N) respectively.
Conclusion: Modified Fin Thread Design of Ti G5 seems to
be the more suitable dental implant model in terms of stress
distribution in normal and over occlusal load conditions. MFT
designs need clinical studies to support this study findings on
patients with long follow up periods.

Titanium dioxide (TiO2) is extensively used part of our
regular life. It can be observed in various commonly utilized
goods & customer imports for instance drugs, plastics,
cosmetics, food and paper. Universally, the quantity of
titanium oxide manufactured in 2009 was 4.68 million tons
for that reason the tenacity of the revision is controlling the
amount of change on the denture base physical features such
as the heat treatment in denture processing (PMMA)through
the implementation of modified outer surface titanium di
oxide Nano particles. Its properties are comprised of water
solubility, surface roughness, water sorption and surface
hardness. The controlled TiO2 powder added to heat cured
acrylic material according to the main weight of PMMA in
concentration of 3%, 5% and 7%, and then it's mixed
regularly by engine of probe ultra-sonication. Titanium oxide
Nano fillers were merged in denture based material with the
help of more free radical polymerization in bulk. The
nanoparticles were surface treated by a layer of trime
thoxysilypropylmethacrylate (TMSPM). 120 specimens were
created and separated into 3 sample sets affording to the
examination (each sample sets consist of 40 samples) and
each sample sets were sectioned in four subsets according to
the TiO2 added ratio and ultimately containing 10 samples in
each subset. The tests which conducted were indentation
hardness (shore D), surface roughness properties as well as
water sorption and solubility. For each test four of the sub
groups (one controlled and three with added Nano TiO2).
Important to mention that extremely elevation in surface
hardness score and roughness were detected at the ratio of
3%, 5%and7%. Thus escalation of added TiO2 nan-fillers
considerably reduced the water solubility and sorption. The
accumulation of the powder of TiO2 nanoparticles which
have been surface treated to the PMMA acrylic resin thus
changing the PMMA properties for example surface rigidity
and surface coarseness. In which it’s increased in direct
proportional relation with the raise of TiO2 concentration; at
the same time addition of surface treated TiO2 Nano particles
decrease water sorption and solubility of (PMMA) also in
direct proportional relation with the raise of TiO2
concentration.