Clinical trial NCT02000557: Photographic Analysis of Soft Tissue Facial Profile in Patients With Class II Malocclusion
Official title: Photographic Analysis Of Soft Tissue Facial Profile In Patients With Class II Malocclusion
Study type: OBSERVATIONAL
Overall status: COMPLETED
Conditions: Class II Malocclusion
Keywords: Photographic analysis
Cephalometric analysis
Standardized photographs
Angular measurements
Linear measurements
Malocclusion
Facial Profile
Lead sponsor: Academy of Interdisciplinary Dental Education and Research
Sponsor class: OTHER
Collaborators: name: Sheikh Zayed Federal Postgraduate Medical Institute
name: University of the Punjab
name: University College of Medicine and Dentistry, Lahore, Pakistan
First posted: 2013-12-04
Enrollment: 60
Sex: ALL
Minimum age (years): 12
Maximum age (years): 30
Standard ages: CHILD
ADULT
Accepts healthy volunteers: no
Observational model: CASE_ONLY
Time perspective: CROSS_SECTIONAL
Sampling method: NON_PROBABILITY_SAMPLE
Study population: Study population comprises of subjects reporting to Dental department of Shaikh Zayed Medical Complex, Lahore and Department of Orthodontics at University College of Medicine and Dentistry, Lahore.

Brief summary: The present day social setup considers facial charisma as an important physical characteristic. The facial characteristics of an individual are measured through anthropometry, photogrammetry, computer imaging and cephalometric radiographs. Cephalometric radiographs offer significant diagnostic information regarding the association between the dental and skeletal structures. By means of photogrammetric measurements, a fresh diagnostic resource is accessible to the orthodontist which permits an intangible, radiation free attainment of measure points of soft tissue with no instrumental expense and radiation to the patient.

Orthodontic patients range from adolescents to senior citizens and originate from an assortment of populations, thus an extensive series of representative norms will be ideal. Knowledge of the normal dentofacial outline of every group will make certain better success of treatment to set up the best possible facial agreement. Hence, it is extremely important to assess the soft tissue profile of a patient as it is one of the most vital components of orthodontic diagnosis and treatment planning.

The purpose of the present study is to evaluate the photographic characteristics of soft tissue facial profile of patients with class II malocclusion as ethnic differences have been found to be reported in the literature. It is hypothesized that soft tissue facial characteristics on lateral profile photographs and lateral cephalometric radiographs in a sample of local population with class II malocclusion are closely related.

Detailed description: The goal of orthodontic treatment planning is to achieve facial synchronization by an esthetically pleasing face.It was a common idea in orthodontic treatment planning that soft tissue enhancement would follow the hard tissues, but this did not always happen.The reaction of soft tissue to hard tissue movement is not found to be consistent.With the emergence of a new paradigm in orthodontic diagnosis and treatment planning, greater emphasis has been placed on the relationships of soft tissues and lesser emphasis on the treatment of malocclusion. During the last few years, diagnosis and treatment planning in orthodontics has been reallocated in the direction of facial planning. Formerly, a lot of consideration was placed on the dental and skeletal components but now greater thought is paid to the soft tissue components. The purpose of treatment in the new paradigm is to place the teeth in optimal position with reference to the lips, both vertically as well as antero-posteriorly.

The facial characteristics of an individual are measured through anthropometry, photogrammetry, computer imaging and cephalometric radiographs. Cephalometric radiographs offer significant diagnostic information regarding the association between the dental and skeletal structures. Lateral cephalogram has been reported in the literature as an essential element of the diagnostic procedure in orthodontics. Frontal and lateral photographs of the patient correspond to another frequently used diagnostic method. Linear and angular soft tissue facial profile analysis on photographs is carried out corresponding to radiographic cephalometry.

While taking a lateral cephalometric radiograph, the patient is exposed to radiations, moreover; the bony structures overlap each other that enhances the likelihood of misreading of the measured values. By means of photogrammetric measurements, a fresh diagnostic resource is accessible to the orthodontist which permits an intangible, radiation free attainment of measure points of soft tissue with no instrumental expense and radiation to the patient. It has also been reported that lip-tooth relationships during speech and while smiling are not documented by means of the cephalometric radiograph. Photographs of the face while smiling and at rest are essential to acquire lip-tooth relationships. By means of this, the orthodontist can evaluate anterior tooth as well as adjoining soft tissue relationships. Even though cephalometry is the standard for illustrating skeletal and dental morphology but it might not be appropriate for extensive epidemiologic studies because of the radiations that the patient is exposed to.

Edward Angle, the father of modern orthodontics classified malocclusion based on the position of the maxillary first molar into three types; class I or neutrocclusion, class II or distocclusion and class III or mesiocclusion. Class II malocclusions are contemplated to be one of the most common among all the other forms of malocclusions. It has been reported in the literature that class II malocclusions present an assortment of dental and skeletal configurations. Skeletal class II patterns occur not merely from sagittal discrepancies but as well from vertical discrepancies.

Dental class II is associated with distal relationship of lower teeth with their upper counterparts. It further has two subdivisions, class II division 1 and class II division 2. Class II division 2 malocclusion is less commonly come across as compared to class II division 1. The etiology behind class II malocclusion is multifactorial. An important etiological agent in this type of malocclusion is the soft tissue. For instance, class II division I malocclusion is commonly due to the result of a short or hypotonic upper lip while class II division II is due to the result of bimaxillary retroclination caused by active muscular lips. Prevalence of different occlusions vary with populations of diverse origin and comparable is the case with class II malocclusion. It has been reported in the international literature that class II malocclusion is the most prevalent form of malocclusion as compared to class I and class III malocclusions.

The purpose of the present study is to evaluate the photographic characteristics of soft tissue facial profile of patients with class II malocclusion. The current study has also been planned to observe and compare the results of photographic and cephalometric variables. Soft tissue profile analysis of class II patients would assist us in planning the orthodontic treatment in such individuals. This would serve the purpose of establishing the diagnostic values that would aid the orthodontists in future while planning the treatment plan for class II patients. Planning soft tissue analysis on photographs would also save the patient from excessive radiographic exposure and would help in better planning of the soft tissues.

Eligibility criteria: Inclusion Criteria:

* Orthodontic patients whose cephalometric radiographs have already been done.
* Males and females in the age group of 12 - 30 years.
* Subjects with convex profiles.
* Intact set of permanent dentition upto the second molars.

Exclusion Criteria:

* Subjects who have previously received orthodontic treatment and orthognathic surgery.
* Subjects with Temporomandibular joint disorder, cleft lip and palate, any kind of syndrome and traumatic deformity.
* Subjects with extractions other than third molars.
* Male subjects with beards.

Primary outcomes:
measure: Mean values of facial profile angles and linear measurements
timeFrame: Within one week after cephalographs and photographs have been taken.
Secondary outcomes:
measure: Comparative angular and linear parameters
timeFrame: Within two weeks after cephalographs and photographs have been taken.
Other outcomes:
Locations:
city: Lahore
country: Pakistan
facility: Shaikh Zayed Medical Complex
state: Punjab
Study officials:
affiliation: Shaikh Zayed Post Graduate Medical Institute, Lahore, Pakistan
name: Ayyaz Ali Khan, Ph. D
role: STUDY_DIRECTOR
affiliation: Shaikh Zayed Post Graduate Medical Institute, Lahore, Pakistan
name: Afifa Ehsan, B.D.S
role: PRINCIPAL_INVESTIGATOR
References:
citation: Zhang X, Hans MG, Graham G, Kirchner HL, Redline S. Correlations between cephalometric and facial photographic measurements of craniofacial form. Am J Orthod Dentofacial Orthop. 2007 Jan;131(1):67-71. doi: 10.1016/j.ajodo.2005.02.033.