Evaluating the Agreement between the Twin-Block Appliance and a New Low-Cost Arch Development Applia

The primary goal of this study is to compare the development of mandibular length by contrasting the effectiveness of a novel low-cost arch development appliance with the twin block appliance in increasing mandibular length (Twin-B).

Methodology: This study focused on patients who visited the Division of Orthodontics at the University of Peradeniya's Faculty of Dental Sciences clinic. Each appliance had 15 males and females, and the sample contained 60 patients treated with Twin-B (n=30) and new low-cost arch development (n=30) appliances. The Concordance Correlation Coefficient (CCC) and the Intraclass Correlation Coefficient (ICC) were calculated to see if the two approaches agreed. To predict mandibular length, a mixed-effects model was fitted, and the best model was chosen using the Akaike Information Criterion (AIC), Bayesian Information Criterion (BIC), and log-likelihood.

The Concordance Correlation Coefficient (CCC) for after treatment was found to be 0.9172, with a 95 percent confidence interval of (0.8488, 0.9555). It also has a Pearson correlation coefficient of 0.9609 and a bias correlation factor of 0.9545. After treatment, the ICC values for single and average measurements are 0.9499 and 0.9743, respectively, with 95 percent confidence intervals of (0.8976, 0.9758) and (0.9460, 0.9878).

Furthermore, both Twin-B and new low-cost arch development appliances have superior agreement and can be utilised interchangeably. As a result, the novel low-cost arch development appliance is a better fit for Sri Lankan patients as a malocclusion treatment because it is less expensive, simpler, and intrusive.

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