The impact of the degree of upper and lower midline deviation on the aesthetic

Background and objectives. Patients' concerns about aesthetics have grown significantly, and the midline is the most critical area of a smile from an aesthetic standpoint. The impact of dental midline deviation on the patient's aesthetics was investigated in order to establish acceptable midline deviation for artificial teeth arrangement. Materials and methods. 300 undergraduate students with an age range (18-25) years were included to estimate the aesthetics using the Visual Analog Scale. After marking the values assigned to the aesthetics of the smile on their respective scales, the researchers determine the distance between the pupils of the eyes with the aim of drawing a straight vertical line down the patient's face. Once the patient is smiling and the upper and lower teeth are in occlusion, we determine if there is a midline deviation or if the upper midline and lower midline coincide with the midface. Results. The majority of UML (upper midline) and LML (lower midline) was to the left (61.46%) and (62.41%) respectively, the degree of deviation (1-1.5mm) with the largest percentage (55.21%), for upper midline, furthermore, the highest mean value of Visual Analog Scale that impact aesthetics was (4mm). Conclusion. The dental midline may be precisely aligned with the mid face line or at a small deviation from the mid face line (not >2 mm) during construction of artificial dental prosthesis. The lower midline deviation as well as the upper midline deviation were to the left.