Active clinical trials for "Malocclusion"

The general trend in the orthodontic practice is to become digital in many aspects. Since 1980s, digital photographs have been available and they play a principal role in the orthodontic practice for documentation and diagnosis purposes. Now photographs have an important role in teaching, scientific research and medical examination. Successful orthodontic treatment is based on a comprehensive diagnosis and treatment planning. A few of the fundamental factors in the diagnosis are the spacing condition, tooth size, arch form and dimensions, as well as the tooth-arch discrepancies. Intraoral photographs' major role is to enable orthodontists to document and analyze the occlusal relationships as well as the dental and soft-tissue features in order to arrive at a good diagnosis and an appropriate treatment plan. In 1975, Robert Little developed Little's irregularity index (LII). The index was proposed to assess teeth irregularity, crowding, relapse, and alignment of anterior teeth as it measured the linear displacements in the horizontal plane between contact points of anterior teeth, ignoring vertical displacement, from mesial surface of one canine to the contra-lateral one. The sum of the 5 liner measurements of displacements was the LII score. The higher the index value, the more severe irregularity of the teeth was. LII has been originally developed for mandibular incisors to study relapse; however, researchers have used it to assess upper and lower incisors irregularity Tooth-size-arch-length discrepancy (TSALD) is widely used on study models to assess the level of harmony between tooth size and the supporting basal bone. Bolton analysis is another important measurement used to identify disharmony between maxillary and mandibular tooth size which is considered an important factor to ensure the success of orthodontic treatment. With the application of the suggested formulas, the overall ratio should be 91.3% (±1.91) and the partial (anterior) ratio should be 77.2% (±1.65). The validity and reliability of performing the above mentioned analyses on images taken of the dental arches have not been evaluated yet in the literature. This is the aim of the current project.

The aim of the present study is to investigate the baseline upper airways dimensions in adult patients belonging to all skeletal classes

The aim of this study is to assess skeletal (bone) and dental (teeth) changes occurring following wear of a twin block functional appliance (removable brace which postures the lower jaw forward to improve a discrepancy between the upper and lower jaw) for differing time periods.

Patient safety is a great concern for the whole society. Since the investigators have a leadership in the medical field in Taiwan, the investigators should be courageous to face the reality from the patients seeking second opinions undergoing orthodontic treatment. Orthodontics just became a recognized specialty by the Department of Health in Taiwan in 2009. It is just a beginning to set up the training course criteria at the national level. It will be a good timing for us to look at the treatment quality when patients seeking second opinions at NTUH. Whether the unsatisfied results are from the patient's unrealistic expectation, patient's compliance issue, doctor's diagnosis, treatment planning or skills, or a simple communication problem, depend on a good systemic analysis from the records and questionnaire collected in a timely fashion. The investigators plan to ask patients who are undergoing full-mouth orthodontic treatment and seeking second opinion to join this study. The investigators will thoroughly explain to patients before they agree to take records and fill in questionnaire. Then the investigators use these records to perform root cause analysis. Our hypothesis is that the risk of adverse event (AE) is related to the training quality, communication skills, patient's understanding and compliance. From these results, the investigators shall be able to assess the risk of AE and make the education policy either at continued education level or special training courses towards a patient satisfied treatment.

The purpose of this study is to examine pacifier sucking habits among children, and to assess implications of the oral habit - for example malocclusions and drooling. The effect of pacifier sucking will be recorded and compared to pacifier type and frequency of use.

The purpose of this study is to assess the performance of the EXD-959 self-ligating ceramic bracket system using EXD 961 instruments in the treatment of orthodontic malocclusion. The information gained in this study and other studies will be used to evaluate the clinical performance of the bracket system during orthodontic treatment and to substantiate marketing claims for the bracket system, open/close instrument and de-bonding instrument.

The aim of the study is to follow a group of preschool children from early permanent dentition to determine the prevalence and incidence of caries malocclusions and to investigated the related risk factors as age, gender, ethnic origin and non-nutritive sucking habits, breathing disturbances, allergies, Dietary habits, oral hygiene status and dental care.

Accuracy of arch analysis in mixed dentition using digital study models versus the plaster models using Tanaka and Johnston prediction equation:

The aim of the study is to demonstrate a correlation between body posture and the structure and function of the stomatognathic system in school-age children.

The patients who applied to the hospital for orthodontic treatment were asked various questions to evaluate their oral health related quality of life, malocclusions and self reported temporomandibular joint problems.