A Comparative Evaluation of Removable Appliances and Clear Aligners in Terms of Multidimensional Parameters and Their Effects on Phonation in Early Orthodontic Treatments During the Mixed Dentition Period

This prospective study aims to compare two different orthodontic treatment modalities-clear aligners and removable appliances-in children aged 6 to 12 years during the mixed dentition period. The primary focus of the research is to evaluate treatment-related changes in oral hygiene status assessed using the Simplified Oral Hygiene Index (OHI-S), oral health-related quality of life, pain and anxiety levels, and speech function. In addition, orthodontic treatment need will be assessed using the Index of Orthodontic Treatment Need (IOTN), including both the Dental Health Component (DHC) and Aesthetic Component (AC). By assessing multiple dimensions associated with early orthodontic intervention, the study seeks to provide a comprehensive understanding of how different appliance types influence clinical, functional, and psychosocial outcomes in pediatric patients.

The mixed dentition period, occurring approximately between the ages of 6 and 12, represents a transitional developmental stage during which primary and permanent teeth coexist. In this phase, early diagnosis and treatment of orthodontic anomalies are particularly important to support functional, aesthetic, and psychosocial development and to minimize the need for more complex treatment in later stages.

Removable orthodontic appliances have traditionally been used to guide dental arch development, correct minor malocclusions, and eliminate harmful oral habits. Advances in digital technology have introduced clear aligners as an alternative treatment option that offers aesthetic and removable features. Despite their differences in design and material characteristics, both approaches are commonly used during early orthodontic treatment planning.

Orthodontic appliances may influence various aspects of oral function, including oral hygiene maintenance, periodontal health, caries risk, pain perception, anxiety levels, and speech performance. In growing children, treatment experiences may additionally shape cooperation, adaptation, and overall quality of life. Therefore, evaluating orthodontic interventions during the mixed dentition period requires consideration of not only mechanical efficiency but also broader functional and psychosocial parameters.

Orthodontic treatment need and malocclusion severity may also influence oral hygiene maintenance during treatment. Therefore, the present study additionally evaluates the relationship between orthodontic treatment need assessed using the IOTN and oral hygiene status assessed using the OHI-S at baseline and during the early treatment period. Appliance-related changes in intraoral volume and tongue movement may alter speech production, potentially affecting articulatory patterns and acoustic characteristics. Contemporary acoustic analysis methods, such as the use of specialized speech software, allow the objective measurement of frequency- and time-based acoustic parameters and provide complementary information to clinical observations.