Evaluation of 3D-printed Space Maintainers Versus Conventional Space Maintainer : a Randomized Clinical Trial

Inclusion Criteria

• •Lower first permanent molar in active state of eruption
• •Patient and parent showing cooperation and compliance.
• •Medically free children.
• •According to space analysis available space is less than or equal to needed space
• •Primary molar loss in the last 1 week due to caries, infection, and resorption (to eliminate possible space loss)
• •Caries free, non-restored buccal surfaces of the mandibular second primary molars and deciduous canines.