METHOD: A total of one hundred and seven patients from age five to twelve years old with non-syndromic unilateral cleft lip and palate were included in the study. These patients have received cheiloplasty and one stage palatoplasty surgery but yet to receive alveolar bone grafting procedure. Five assessors trained in the use of the EUROCRAN index underwent calibration exercise and ranked the dental arch relationships and palatal morphology of the patients' study models. For intra-rater agreement, the examiners scored the models twice, with two weeks interval in between sessions. Variable factors of the patients were collected and they included gender, site, type and, family history of unilateral cleft lip and palate; absence of lateral incisor on cleft side, cheiloplasty and palatoplasty technique used. Associations between various factors and dental arch relationships were assessed using logistic regression analysis.

RESULT: Dental arch relationship among unilateral cleft lip and palate in local population had relatively worse scoring than other parts of the world. Crude logistics regression analysis did not demonstrate any significant associations among the various socio-demographic factors, cheiloplasty and palatoplasty techniques used with the dental arch relationship outcome.

MATERIALS AND METHODS: One hundred and one sets of dental models of patients having CUCLP were assessed in this retrospective study. Five examiners that were blinded to case-specific information scored the dental models at two instances with an interval of two weeks to ensure memory bias elimination (5 × 101 × 2 = 1010 observations). Calibration courses were conducted prior to scoring and each examiner was provided with scoring sheets, pictures of GOSLON reference models and flowcharts explaining the scoring method.