18 research outputs found
Bone- and dentoalveolar-anchored dentofacial orthopedics for Class III malocclusion: New approaches, similar objectives? A systematic review
Objectives:
To analyze the scientific literature and compare in the results of conventional orthopedic appliances with those obtained from recent bone-anchored orthopedics for Class III malocclusion.
Materials and Methods:
The literature was systematically reviewed using PubMed/Medline, Scopus, and Scirus databases up to January 2012. Articles were selected by two different researchers (kappa index = 0.83), based on established inclusion/exclusion criteria. Methodologic quality was classified as high, medium, or low quality.
Results:
The search strategy identified 1020 titles. Thirty studies were selected after applying the criteria (high quality = 9, medium quality = 21). Protraction rates differed within a range of one- to twofold between bone-anchored and dentoalveolar therapies (P < .001). All studies noted the effect of clockwise rotation on the mandible and an increase in inferior-anterior and total facial height; this was more obvious in dentoalveolar therapy than in bone-anchored orthopedics (P < .001).
Conclusions:
Dental parameters like overjet increased significantly with both sets of groups, ranging from 1.7 to 7.9 mm with dentoalveolar therapy and from 2.7 to 7.6 mm with bone-anchored orthopedics
Association between condylar asymmetry and temporo-mandibular disorders using 3D-CT
Objectives: Using reconstructed three-dimensional computed tomography (3D-CT) models, the purpose of this study was to analyze and compare mandibular condyle morphology in patients with and without temporomandibular disorder (TMD). Study Design: Thirty-two patients were divided into two groups: the first comprised those with TMD (n=18), and the second those who did not have TMD (n=14). A CT of each patient was obtained and reconstructed as a 3D model. The 64 resulting 3D condylar models were evaluated for possible TMD-associated length, width and height asymmetries of the condylar process. Descriptive statistics were used to assess the results and student?s t tests applied to compare the two groups. Results: Statistically significant (p<0.05) vertical, mediolateral and sagittal asymmetries of the condylar process were observed between TMD and non-TMD groups. TMD patients showed less condylar height (p<0.05) in comparison with their asymptomatic counterparts. Conclusions: Using 3D-CT, it was shown that condylar width, height and length asymmetries were a common feature of TM
Diagnostic of craniofacial asymmetry : literature review
Facial asymmetry is a common feature in many syndromes, and requires surgery as the only valid treatment option. Routine diagnostic methods (frontal RX, panoramic RX and submentovertex RX) have serious limitations mainly due to the transfer from a three dimensional image to a two dimensional plane. The feasibility of such methods is poorly supported due to inherent projection errors (image magnification, cranial rotation) and identification errors (image quality, precision and reproducibility). The use of computer tomographies represents a substantial improvement in the sense of skeletal and soft tissue structures? reproduction precision. The interpretation of this new data source makes evident the necessity of new analysis tools for extraction, manipulation and synthesization of the whole diagnostic and therapeutical potential based on more solid studies in this field
Confocal microscopy: a valid approach to evaluate the three-dimensional characteristics of root-end cavities
Objective: To analyze, using confocal microscope, the three-dimensional characteristics of the root-end cavity
preparations completed in root apices of extracted teeth determining their area, perimeter, circularity and cavo-surface angle.
Study design: Thirty-two single-rooted extracted teeth underwent endodontic treatment and apical resection.
Root-end cavities were prepared according to 4 protocols, as follows: Group1, stainless steel ultrasonic tips (SST)
at 33 KHz power; Group 2, SST at 30 KHz power; Group 3, diamond-coated ultrasonic tips (DCT) at 30 KHz
power; and Group 4, DCT at 33 KHz power. Finally, root-end cavity was evaluated using a confocal microscope,
recording its area, perimeter, circularity and cavo-surface angle.
Results: The largest cavity perimeter was found in the Group 2 (4.8 ± 1.6 mm) (p > 0.05). Root-end cavities performed
using SST showed larger areas than those performed with DCT (p = 0.03). The power of vibration or the tip type did
not show correlation with the perimeter, circularity and cavo-surface angle of the root-end cavity (p > 0.05).
Conclusions: Confocal microscopy is a useful approach to study the three-dimensional characteristics of the root-
end cavit
Prospective double-blind clinical trial evaluating the effectiveness of Bromelain in the third molar extraction postoperative period
Objectives: To evaluate the anti-inflammatory and analgesic effect of Bromelain (pineapple extract) administered
orally in the postoperative after extraction of impacted lower molars.
Study Design: This is a prospective, placebo-controlled, unicentric, double-blind study; the sample size was 34
patients. The pre and postoperative outcomes, evaluated on the third (D3) and eighth day (D8), included inflam
-
tion, pain and oral aperture, as well as the need for analgesics. One group received bromelain 150mg per day for
three days and 100mg on days 4 to 7. The other group received placebo in the same dosage. All outcomes wer
-
recorded quantitatively and analyzed with the Mann-Whitney U test for independent samples.
Results: Although there were no statistically significant differences between the treatment groups, a trend towards
less inflammation and improved oral aperture was observed in the group that received bromelain, compared to the
group that received placebo. This trend can be attributed completely to random reasons, since there is no statistical
difference in the results.
Conclusions: Further studies are necessary to analyze different administration patterns and doses of bromelain for
the use in the postoperative of impacted third molars
Determination of periodontopathogens in patients with Cri du chat syndrome
Objectives: Cri du chat syndrome is a genetic alteration associated with some oral pathologies. However, it has not
been described previously any clinical relationship between the periodontal disease and the syndrome. The purpose
of this comparative study was to compare periodontopathogenic flora in a group with Cri du chat syndrome
and another without the síndrome, to assess a potential microbiological predisposition to suffer a periodontitis.
Study Design: The study compared nineteen subjects with Cri du chat Syndrome with a control group of nineteen
patients without it. All patients were clinically evaluated by periodontal probing, valuing the pocket depth, the
clinical attachmente level and bleeding on probing. There were no significant differences between both groups.
Aggregatibacter actinomycetemcomitans, Porphyromonas gingivalis, Prevotella intermedia, Tannerella forsythia
and Treponema denticola were detected by multiplex-PCR using 16S rDNA (microIDENT).
Results: When A. actinomycetemcomitans, P. gingivalis, P. intermedia and T. denticola were compared, no statistically
significant differences were found between the two groups (p>0.05). The value of T. forsythia was significantly
higher for Cri du chat syndrome (31.6%) than for the control group (5.3%). The odds ratio for T. forsythia
was 8.3.
Conclusions: In the present study T. forsythia is associated with Cri du chat syndrome subjects and not with
healthy subjects
Comparative trial between the use of amoxicillin and amoxicillin clavulanate in the removal of third molars
Objectives: The purpose of this study was to compare the use of amoxicillin (1g) vs amoxicillin and clavulanate
(875/125mg) after extraction of retained third molars for prevention of infectious complications.
Study Design: The study involved 546 patients attending for removal a retained third molar and divided in to two
groups: Group 1 - amoxicillin and clavunate (875/125mg) group (n=257) and Group 2 - amoxicillin (1g) group
(n=289). All patients were recalled for investigating the possibility of infection, presence of diarrhea and further
analgesic intake.
Results: From a total of 546 patients, the frequency of infection was 1.4%, without no statistically differences be
-
tween the two groups. Group 1 showed statistically higher presence of patients with gastrointestinal complications
(
p>0.05).
In 546 patients, 2.7% of patients reported severe pain that would not relieve with medication.
Conclusions: The results of our study show that the use of amoxicillin (1g) and amoxicillin and clavunate
(875/125mg) is similar efficacious in preventing infection after retained third molar extraction but amoxicillin and
clavunate (875/125mg) produces more gastrointestinal discomfort
Craniofacial asymmetry e494 Journal section: Oral Surgery
Abstract Facial asymmetry is a common feature in many syndromes, and requires surgery as the only valid treatment option. Routine diagnostic methods (frontal RX, panoramic RX and submentovertex RX) have serious limitations mainly due to the transfer from a three dimensional image to a two dimensional plane. The feasibility of such methods is poorly supported due to inherent projection errors (image magnification, cranial rotation) and identification errors (image quality, precision and reproducibility). The use of computer tomographies represents a substantial improvement in the sense of skeletal and soft tissue structures' reproduction precision. The interpretation of this new data source makes evident the necessity of new analysis tools for extraction, manipulation and synthesization of the whole diagnostic and therapeutical potential based on more solid studies in this field
Mechanical behavior of single-layer ceramized zirconia abutments for dental implant prosthetic rehabilitation
Objectives: This study was undertaken to characterize the mechanical response of bare (as-received) and single-
layer ceramized zirconia abutments with both internal and external connections that have been developed to enhan
-
ced aesthetic restorations.
Material and Methods: Sixteen zirconia implant abutments (ZiReal Post®, Biomet 3i, USA) with internal and ex
-
ternal connections have been analyzed. Half of the specimens were coated with a 0.5mm-thick layer of a low-fusing
fluroapatite ceramic. Mechanical tests were carried out under static (constant cross-head speed of 1mm/min until
fracture) and dynamic (between 100 and 400N at a frequency of 1Hz) loading conditions. The failure location was
identified by electron microscopy. The removal torque of the retaining screws after testing was also evaluated.
Results: The average fracture strength was above 300N for all the abutments, regardless of connection geometry
and coating. In most of the cases (94%), failure occurred by abutment fracture. No significant differences were
observed either in fatigue behavior and removal torque between the different abutment groups.
Conclusions: Mechanical behavior of Zireal zirconia abutments is independent of the type of internal/external
connection and the presence/absence of ceramic coating. This may be clinically valuable in dental rehabilitation to
improve the aesthetic outcome of zirconia-based dental implant systems