Aim: To determine the association between dental anomalies and type of facial cleft, gender, ethnicity and timing of hard palate repair surgery.Methods: This observational study comprised a total of 85 non-syndromic cleft children (mean age 9.7 ± 3.2 years) of different ethnicity (68 Caucasians, 7 Asians, 4 Africans, 5 Hispanics and 1 Indian). Sixty-four patients were affected by lip palate cleft, 11 by lip alveolus cleft and 10 by palate cleft. Sixty-one children underwent delayed palate repair at 4.3 years of age, while 21 underwent early palate periosteoplasty at 7.2 months of age. Patients were examined clinically and radiologically to assess dental anomalies. Dental cavities were registered using dmft/DMFT indexes in primary and permanent dentition, while enamel defects were evaluated only in permanent teeth using Aine index. Results: Tooth rotation and agenesis were the most common tooth anomalies affecting 59％ and 42.2％ of cleft patients, respectively. While a late closure of the cleft palate was associated with a higher number of rotations (P = 0.03), an early surgical correction was associated to a higher frequency of tooth agenesis (P = 0.02), number of carious lesions in primary dentition (P = 0.002) and more severe enamel defects in permanent teeth (P < 0.01). A late palate repair increased 3.5 times the likelihood of having at least one rotated tooth (P = 0.034), while decreased the odds of having agenesis by 70％ (P = 0.029) compared to an early surgical repair. Conclusion: Early surgical approaches seem to have more detrimental effects on dental development in both primary and permanent dentition than late surgical protocols. Dental abnormalities in cleft patients have complex etiology combining genetic and external factors and their prevalence can also depend on timing of hard palate surgery.
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