relation between 10a', 10b' markers and lateral segment length in complete unilateral cleft lip

Introduction: the characteristics of the cleft lip in terms of size and, consequently, the determination of the severity of the pathology are necessary to judge the quality of the surgery; therefore, we decided to analyze the standard lip measurements in patients with complete unilateral cleft lip and evaluate them at the end of the operation to find the relationship between the size of the lip and nasal variables.methods: this descriptive and prospective study was performed with the participation of 20 children aged 1.5 to 4 months who had complete unilateral cleft lip with nasal deformity during 2016-19 in imam reza hospital (tabriz-iran). after the analysis, standard lip measurements were performed. finally, the data were entered into spss23 software and analyzed by spearman correlation test, independent samples and mann-whitney.results: there is a strong correlation between the width of the alveolar cleft at the anteroposterior plane with a difference of 5a and 5b. also, there was a significant and strong correlation between the width of the alveolar cleft at the horizontal level with the difference of 5a and 5b, in other words, increasing the width of the alveolar cleft in the horizontal and anteroposterior planes, the difference between 5a and 5b also increases.conclusion: according to the results, there was a relation between 5b and 10 a’ b’. so the amountof 5b decreases moderately, by increasing the amount of 10 a’ b’.