Objective: To compare occlusal relationship in patients undergoing neonate versus conventional lip surgery (LS) with and without infant orthopedics (IO) by assessment of dental arch relationship in individuals with complete unilateral cleft lip and palate. Material and Methods: Three groups treated by different protocols; Group I: neonate LS (1-15 days) + IO and palatoplasty (13-31 months); Group II: LS (3-12 months) + IO and palatoplasty (15-35 months); and Group III: LS (3-6 months) without IO and palatoplasty (12-18 months). The 112 intraoral photographs of individuals of all groups, obtained between 6 and 12 years of age, were assessed by the occlusal index for intraoral photograph rating. The groups were compared by the χ2 test. The correlation between surgical timing and the scores was tested by the Spearman test ( P < .05). Results: Group I presented the highest percentage of score 5, group II exhibited highest percentage of score 1, and group III presented the lowest percentage of score 5 according to the χ2 test ( P = .029). The Spearman correlation test revealed statistically significant difference between timing of LS and the occlusal index. The earlier the surgical timing, the higher the occlusal index ( P = .019). Conclusions: Infant orthopedics has demonstrated the possibility of postponing primary plastic surgeries. Patients submitted to late lip and palate repair had the best prognosis, while patients undergoing lip repair from 1 to 15 days of life, even operating the palate later, had the worst prognosis. Neonate LS negatively influenced the occlusal relationships.
