Introduction: The aim of this study was to evaluate the prevalence of bacteremia associated with an orthodontic
stripping procedure. Methods: The study included 29 orthodontic patients (mean age, 18.2 6 3.4 years). We
used a standardized stripping procedure: a perforated stripping disk with a contra-angle hand piece was used
at a low speed (\15,000 rpm; 10 seconds) on the mandibular anterior teeth. Blood samples were collected
by inserting a cannula into the left antecubital fossa. A baseline sample was taken before treatment, and
a second sample was taken after the stripping procedure. These samples were inoculated into aerobi . . .c and
anaerobic blood culture bottles and incubated, and the bacterial cultures were identified; the samples
collected before and after the stripping procedure were statistically analyzed. Results: Transient bacteremia
was not detected in any pretreatment blood sample, but it was found in 1 postoperative blood sample; this
sample tested positive for Streptococcus sanguis. Conclusions: The bacterial species in the positive
postoperative blood sample was S sanguis, which might be associated with infective endocarditis. Clinicians
should explain the level of risk to the patient and consult a concerned medical specialist
Daha fazlası
Daha az
The aim of this experimental study was to evaluate
the effects of light-emitting diode-mediated-photobiomodulation
therapy (LPT), on the rate of orthodontic tooth movement (TM)
and orthodontically induced root resorption, in rats. Twentymale
12-week-oldWistar rats were separated into two groups (control
and LPT) and 50 cN of force was applied between maxillary left
molar and incisor with a coil spring. In the treatment group, LPT
was applied with an energy density of 20 mW/cm2 over a period
of 10 consecutive days directly over the movement of the first
molar teeth area. The distance between the teeth was measured
with a di . . .gital caliper on days 0 (T0), 10 (T1), and 21 (T2) on
dental cast models. The surface area of root resorption lacunae
was measured histomorphometrically using digital photomicrographs.
Mann–Whitney U and Wilcoxon tests were used for
statistical evaluation at p
Daha fazlası
Daha az
Horizontal root fractures are rare in comparison to other types of injuries and the reported
prevalence in the literature is between 0.5% and 7%. The treatment and prognosis of root
fractures depend on many variables, the most important being the length of time between trauma
and treatment, degree of dislocation and mobility, site of fracture, fixation period, stage of root
development, age of patient, and quality of treatment. The ideal healing type is hard tissue healing.
The aim of these case reports is to present four different patients who had horizontal root fractures
of immature permanent teeth treated by repositi . . .oning and fixation with good healing. Patients were
referred to our clinic with a complaint of mobility and tenderness in their upper central incisors
as a result of an orofacial injury. As a result of radiographical examination, horizontal fractures
were diagnosed on the roots. Teeth were repositioned and rigid fixation was applied. Splints were
retained for about 12 weeks. After splints were removed, patients were scheduled for follow‑up
visits at 3 month intervals. After long‑term clinical and radiographical follow‑up, all teeth presented
positive response to electrical pulp tests, suggesting a repair of root fractures. These immature teeth
showed radiographic evidence of continued root development and normal color and mobility, and
no pain was observed in horizontal and vertical percussion tests. Patients reported no discomfort
with their teeth. Using splints without any further treatment was found to be successful in the
presence of suitable conditions for the treatment of horizontal root fractures
Daha fazlası
Daha az
This in vitro study was to evaluate the erosive potential of four soft drinks at different times on bovine teeth by profilometry. Bovine incisors buccal side was sectioned with a diamond saw and a total of 100 enamel blocks were prepared (8 × 4 × 0.5 mm). Five specimens each were exposed to 60 ml of soft drinks (Sprite, Coca Cola, Cappy-orange and Ayran) for 15, 30, 60, 120 and 180 minutes in a continuously vibrating soft drinks bath in a beaker at room temperature. Surface loss of the specimens was determined with a profilometry. The data were analyzed by two-way analysis of variance and Tukey HSD test. Loss of enamel was observed . . .in Coca Cola, Cappy and Sprite groups. Coca Cola was significantly higher erosive potential in 180 minutes than other soft drinks (p < 0.05). Ayran was no sign of erosive potential in all time. It can be concluded that the composition of the beverages had a significant effect on dental erosion, so consumption of Ayran can be advised
Daha fazlası
Daha az
Objective: To evaluate lower incisor position and bony support between
patients with Class II average- and high-angle malocclusions and compare
with the patients presenting Class I malocclusions. Methods: CBCT records of
79 patients were divided into 2 groups according to sagittal jaw relationships:
Class I and II. Each group was further divided into average- and high-angle
subgroups. Six angular and 6 linear measurements were performed. Independent
samples t-test, Kruskal–Wallis, and Dunn post-hoc tests were performed for
statistical comparisons. Results: Labial alveolar bone thickness was significantly
higher in Cl . . .ass I group compared to Class II group (p = 0.003). Lingual alveolar
bone angle (p = 0.004), lower incisor protrusion (p = 0.007) and proclination (p
= 0.046) were greatest in Class II average-angle patients. Spongious bone was
thinner (p = 0.016) and root apex was closer to the labial cortex in high-angle
subgroups when compared to the Class II average-angle subgroup (p = 0.004).
Conclusions: Mandibular anterior bony support and lower incisor position were
different between average- and high-angle Class II patients. Clinicians should be
aware that the range of lower incisor movement in high-angle Class II patients
is limited compared to average- angle Class II patients
Daha fazlası
Daha az
Objective: To evaluate the changes in cortical bone thickness, alveolar bone
height, and the incidence of dehiscence and fenestration in the surrounding
alveolar bone of posterior teeth after rapid maxillary expansion (RME) treatment
using cone-beam computed tomography (CBCT). Methods: The CBCT records of
20 subjects (9 boys, mean age: 13.97 ± 1.17 years; 11 girls, mean age: 13.53 ±
2.12 year) that underwent RME were selected from the archives. CBCT scans had
been taken before (T1) and after (T2) the RME. Moreover, 10 of the subjects had
6-month retention (T3) records. We used the CBCT data to evaluate the buccal
and . . . palatal aspects of the canines, first and second premolars, and the first
molars at 3 vertical levels. The cortical bone thickness and alveolar bone height
at T1 and T2 were evaluated with the paired-samples t-test or the Wilcoxon
signed-rank test. Repeated measure ANOVA or the Friedman test was used to
evaluate the statistical significance at T1, T2, and T3. Statistical significance was
set at p < 0.05. Results: The buccal cortical bone thickness decreased gradually
from baseline to the end of the retention period. After expansion, the buccal
alveolar bone height was reduced significantly; however, this change was not
statistically significant after the 6-month retention period. During the course
of the treatment, the incidence of dehiscence and fenestration increased and
decreased, respectively. Conclusions: RME may have detrimental effects on the
supporting alveolar bone, since the thickness and height of the buccal alveolar
bone decreased during the retention period
Daha fazlası
Daha az
Introduction: The aim of this study was to determine the peri-miniscrew implant crevicular fluid receptor
activator of nuclear factor-lB ligand (RANKL) and osteoprotegerin (OPG) levels around loaded and unloaded
miniscrew implants at different time intervals. Methods: Twenty loaded and 16 unloaded miniscrew implants
were included in this study. All miniscrew implants were placed bilaterally between the maxillary second premolars
and first molars as anchorage units for canine distalization. Peri-miniscrew implant crevicular fluid was taken
from the mesiobuccal aspects of the loaded and unloaded miniscrew implants before loading; . . . at 24, 48, and 168
hours; and on day 30 after force application. Enzyme-linked immunosorbent assay kits were used to determine
RANKL and OPG levels in the peri-miniscrew implant crevicular fluid samples. Wilcoxon, Mann-Whitney U, and
Spearman correlation tests were used for statistical evaluations at the P\0.05 level. Results: Although the total
amount of OPG was not different between the groups, the total amount of RANKL was significantly elevated in
the loaded miniscrew implant group (P\0.05) at all time periods. Peri-miniscrew implant crevicular fluid volume
was the highest at 48 hours in the loaded group. Also, the OPG/RANKL ratio in the peri-miniscrew implant
crevicular fluid was significantly decreased in the loaded miniscrew implant group. Conclusions: The OPG
and RANKL levels vary around loaded and unloaded miniscrew implants as a result of force application
Daha fazlası
Daha az
...
6698 sayılı Kişisel Verilerin Korunması Kanunu kapsamında yükümlülüklerimiz ve çerez politikamız hakkında bilgi sahibi olmak için alttaki bağlantıyı kullanabilirsiniz.