Does Mandibular Distraction Osteogenesis for Robin Sequence Create Altered Craniofacial Morphology and Disrupt Tooth...

Area of Science:

• Craniofacial Surgery
• Pediatric Dentistry
• Orthodontics

Background:

• Robin Sequence (RS) infants often require mandibular distraction osteogenesis (MDO) to address airway obstruction.
• MDO can influence craniofacial morphology and potentially disrupt developing dentition.

Purpose of the Study:

• To evaluate the impact of MDO on craniofacial morphology in RS patients.
• To assess the association between MDO and tooth development in RS subjects.

Main Methods:

• Retrospective cohort study comparing RS infants with and without MDO.
• Cephalometric analysis of craniofacial morphology at presurgical, postsurgical, and mixed dentition stages.
• Radiographic assessment of tooth development in the mixed dentition phase.

Main Results:

• MDO was associated with increased ramus height and mandibular body length, and forward mandibular rotation post-procedure.
• Post-MDO patients exhibited more obtuse gonial angles and steeper mandibular planes compared to non-MDO RS patients.
• 31% of MDO-treated RS infants showed abnormal tooth development, compared to none in the non-MDO group.

Conclusions:

• MDO effectively increases mandibular size in RS infants but carries a risk of disrupting tooth development.
• Post-MDO craniofacial morphology tends towards a more vertical growth pattern with increased gonial angles.
• The findings highlight the need for careful monitoring of dental development in RS patients undergoing MDO.