Space Changes After Premature Loss of Lower First Primary Molars in Children Using Digital Scanning

Premature loss of primary molars in children is a common result of caries or trauma, potentially affecting future occlusion and alignment. This study investigates the space changes that occur after unilateral premature extraction of the mandibular first primary molar before the eruption of the permanent first molar. Using a split-mouth design, the contralateral non-extracted side serves as the control. Digital impressions will be taken at baseline (day of extraction) and after 6 months. The primary outcome is the change in the D space, and the secondary outcome is the change in the mandibular arch perimeter, both measured using 3D digital software. The study aims to provide evidence for or against the routine use of space maintainers in similar clinical scenarios, potentially reducing unnecessary treatment and improving patient comfort.

Inclusion criteria

• Children aged 3 to 5.5 years
• Mandibular first primary molar indicated for extraction due to extensive decay or hopeless prognosis
• Contralateral mandibular first primary molar must be intact and free of proximal caries
• No eruption of mandibular permanent first molar at the time of enrollment
• Presence of primary canines and second primary molars
• No space maintainers placed
• Parents/caregivers unable or unwilling to fabricate a space maintainer

Exclusion criteria

• Bilateral premature loss of mandibular first primary molars
• Contralateral mandibular molar has proximal caries or poor prognosis
• Children with good prognosis first primary molars (i.e., not needing extraction)
• Eruption of the mandibular permanent first molar
• Children who already have space maintainers
• Uncooperative behavior preventing study participation