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

The primary goal of this study is to compare the growth of mandibular length by contrasting the effectiveness of a new 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 study included 60 subjects treated with Twin-B (n=30) and new low-cost arch creation (n=30) appliances. The Concordance Correlation Coefficient (CCC) and the Intraclass Correlation Coefficient (ICC) were determined to see if the two methods agreed. To predict mandibular length, a mixedeffects 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 care, the ICC values for single and average tests are 0.9499 and 0.9743, respectively, with 95 percentconfidence intervals of (0.8976, 0.9758) and (0.9460, 0.9878).Furthermore, both Twin-B and modern low cost arch construction appliances have stronger agreement and can be used interchangeably.As a result,the latest lowcost arch production appliance is a better fit for Sri Lankan patients as a malocclusion treatment because it is less costly, easier, and invasive.

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