Evaluation of Malocclusion of the Cleft Lip and Palate in Mashhad University of Medical Sciences Using the GOSLON-Yardstick Index from 2009 to 2020

GOSLON-Yardstick index (GYI) is a standard classification system that is used to assess the outcomes of treatment in cleft lip and palate (CLP) patients. This study aimed to evaluate the prognosis and occlusion characteristics of CLP patients in Mashhad University of Medical Sciences, Mashhad, Iran, from 2009 to 2020 using the GYI.

This cross-sectional study evaluated 104 gypsum casts of the CLP patients referred to the CLP clinic. Patients were divided into the unilateral CLP (UCLP, n=72) and bilateral CLP (BCLP, n=32). Subsequently, the occlusal characteristics of the patients were classified into five groups using the GYI. The data were analyzed through the Mann-Whitney U test.

The number of patients with a higher GYI index score was more in both UCLP and BCLP groups. However, there was a significant difference between the two groups regarding the cleft type and GYI classification (P=0.002).

Higher levels of GYI (No.4 and No.5) were more frequent in both BCLP and UCLP patients indicating poor occlusal characteristics and prognosis of the treatment.