Treatment of Severe Caries and Molar Incisor Hypomineralization and Its Influence on Oral Health-Related Quality of Life in Children: A Comparative Study

Background: Treatment of oral diseases can have a long-lasting impact on a child’s life well beyond its childhood years. The purpose of this study was to compare the impact of treatment on the oral-health-related quality of life (OHRQoL) of children with severe caries and severe molar incisor hypomineralization (MIH). Methods: A total of 210 children (mean age 9 years; 49% female) with severe caries (inner third of dentin) and severe MIH (post-eruptive breakdown, crown destruction) were included in the study. Both groups were matched according to age, gender, and social status. The German version of the Child Perception Questionnaire for 8–10-year-olds (CPQ-G8–10) was used before and after treatment to analyze the impact on OHRQoL. Results: Patients with severe MIH showed a significantly higher total CPQ score (17.8 (±10.6)) before treatment compared to the caries group (13.8 (±14.3)). The mean CPQ score in all subdomains decreased significantly after therapy in the MIH group. Children with severe carious lesions had similar results except in the domain “functional limitations”, as treatment led to only minor changes (2.9 (±3.6) to 2.2 (±2.6)). Conclusions: Despite a narrower treatment spectrum, patients with severe MIH experienced a greater overall improvement in OHRQoL compared to the caries group.