Purpose: This study aimed to obtain the oral health-related factors of patients with intellectual and developmental disabilities (IDD) from family caregivers and to relate caregiver-perceived risk factors to dental treatment needs of patients. Materials and Methods: A total of 120 dyads of patients (mean [SD] age = 29.1 [8.4] years) and their family caregivers (mean [SD] age = 56.5 [9.5] years) were included. Data were obtained from self-administered questionnaires by caregivers and oral examinations by a dentist. Oral health conditions of patients were analysed in different age groups using paired t-tests. Caregiver-perceived oral health conditions of patients and dentist-assessed caries and periodontal disease were compared using Pearson’s chi-squared and Fisher’s exact tests. Relationships between patient factors and treatment needs were analysed using multiple logistic regression. Results: Tooth pain, chewing difficulty, and reasons for the last dental visit were associated with high numbers of decayed teeth (DT) (p < 0.05). Overall oral health condition of patients rated by caregivers was related to high DT
and the Community Periodontal Index (CPI) score (p < 0.05). Well-maintained dental care of caregivers was associated
with lower numbers of DT and less urgent treatment needs of patients (p < 0.05). Conclusion: There were caregiver-perceived factors indicating dental treatment needs of patients with IDD. Proxy reports
by caregivers can be used as risk predictors for ongoing dental problems of patients with communication limitations.