Objective: To determine the prevalence of malocclusion and orthodontic treatment need in a
large sample of Central Anatolian adolescents and compare them with European-other
nations' adolescents. Methods: The sample included 1125 boys and 1204 girls aged between 12 and 16 years with no
previous orthodontic treatment history. Occlusal variables examined were molar
relationship, overjet, overbite, crowding, midline diastema, posterior crossbite,
and scissors bite. The dental health (DHC) and aesthetic components (AC) of the
Index of Orthodontic Treatment Need (IOTN) were used as an assessment measure of
the need for orthodontic treatment for the total sample. Results: The results indicated a high prevalence of Class I (34.9%) and Class II, Division
1 malocclusions (40.0%). Moreover, increased (18%) and reduced bites (14.%), and
increased (25.1%) and reversed overjet (10.%) were present in the sample. Conclusion: Using the DHC of the IOTN, the proportion of subjects estimated to have great and
very great treatment need (grades 4 and 5) was 28.%. However, only 16.7% of
individuals were in need (grades 8-10) of orthodontic treatment according to the
AC.
In this study, many subjects with TMD had malocclusions. Early treatment may be important in the prevention of severe TMD. Significant associations were found between different signs, and TMD was associated with posterior crossbite, anterior open bite, Angle Class II and III malocclusions, and extreme maxillary overjet.
ObjectiveThe aim of this study was to evaluate the effects of tribochemical silica coating
and silane surface conditioning on the bond strength of rebonded metal and ceramic
brackets.Material and MethodsTwenty debonded metal and 20 debonded ceramic brackets were randomly assigned to
receive one of the following surface treatments (n=10 for each group): (1)
sandblasting (control); (2) tribochemical silica coating combined with silane.
Brackets were rebonded to the enamel surface on the labial and lingual sides of
premolars with a light-polymerized resin composite. All specimens were stored in
distilled water for 1 week and then thermocycled (5,000 cycles) between 5-55°C.
Shear bond strength values were measured using a universal testing machine.
Student's t-test was used to compare the data (α=0.05). Failure mode was assessed
using a stereomicroscope, and the treated and non-treated bracket surfaces were
observed by scanning electron microscopy.ResultsRebonded ceramic brackets treated with silica coating followed by silanization had
significantly greater bond strength values (17.7±4.4 MPa) than the sandblasting
group (2.4±0.8 MPa, P<0.001). No significant difference was observed between
the rebonded metal brackets treated with silica coating with silanization (15±3.9
MPa) and the sandblasted brackets (13.6±3.9 MPa). Treated rebonded ceramic
specimens primarily exhibited cohesive failure in resin and adhesive failure at
the enamel-adhesive interface.ConclusionsIn comparison to sandblasting, silica coating with aluminum trioxide particles
followed by silanization resulted in higher bond strengths of rebonded ceramic
brackets.
Class III malocclusions are usually growth-related discrepancies, which often become more severe until growth is complete. The surgery can be part of the treatment plan. The purpose of this report is to review the orthodontic treatment of two patients with a Class III malocclusion who were treated non-surgically. The basis for this treatment approach is presented and the final treatment result reviewed. Important factors to consider when establishing a Class III molar relationship are discussed.
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