Purpose of the Research: To reveal the genetic cause for the occurrence of Class III malocclusion, or what may be described as a reverse bite (underbite). Introduction and Detailed Procedures for the Patient (Work Plan): 1. The volunteer will rinse their mouth with chlorhexidine before taking the swab. 2. A saliva sample will be collected from the patient using a syringe, along with a frontal facial photograph and a lateral cephalometric X-ray. 3. DNA / genetic material will be extracted from the sample. 4. Screening will be conducted for genetic mutations that may be responsible for the occurrence of the underbite. 5. The photographs and X-rays will be analyzed and compared with the swab results. 6. This data will be analyzed to determine whether the detected mutations are the cause of the underbite. 7. The sample will be retained for use in future research studies. Side Effects, Expected Risk Levels, and Management" * Pain: Mild discomfort during swab collection, which does not require any painkillers. * Infection/Inflammation: Mild inflammation at the sample site or a secondary bacterial infection; in this case, antibiotics may be prescribed if necessary. * Risk Level: Low risk, estimated to be less than 5%.
Study Type
OBSERVATIONAL
Enrollment
93
Faculty of Dentistry, Cairo University
Cairo, Egypt
presence of single nucleotide polymorphism
difference in snps between control and study group
Time frame: cross-sectional - results are assessed at one point of time (Preintervention)
lateral cephalometric measurements
if the snps found have a correlation with different linear and angular measurements
Time frame: cross-sectional - results are assessed at one point of time (Preintervention)
Frontal photos measurements
If the snps found have a correlation with different ratios on frontal photos:
Time frame: cross-sectional - results are assessed at one point of time (Preintervention)
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