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A new patient-specific helical maxillary distractor: a cadaver test.
J Gateno1, S Bartlett2, D Kim3
1Department of Oral and Maxillofacial Surgery, Houston Methodist Hospital and Research Institute, Houston, TX, USA; Oral and Maxillofacial Surgery, Houston Methodist Academic Institute, Houston, TX, USA; Oral and Maxillofacial Surgery, Weill-Cornell Medical College, New York, USA.
This cadaver study evaluated custom helical distraction systems for maxillomandibular advancement. Patient-specific antral distractors showed feasibility, achieving good occlusion despite minor maxillary advancement discrepancies.
Area of Science:
- Oral and Maxillofacial Surgery
- Biomedical Engineering
- Orthodontics
Background:
- Maxillomandibular advancement (MMA) is crucial for treating skeletal discrepancies.
- Current distraction osteogenesis techniques have limitations.
- Patient-specific instrumentation offers potential for improved surgical outcomes.
Purpose of the Study:
- To assess the feasibility of a novel custom helical distraction system.
- To evaluate patient-specific antral maxillary distractors in a cadaver model.
- To compare custom helical distractors with standard linear distractors.
Main Methods:
- Virtual planning for asymmetric MMA using custom patient-specific hardware.
- Sequential mandibular advancement and gradual maxillary distraction in two fresh cadaver heads.
- Analysis of accuracy, rotational stability, and occlusal outcomes.
Main Results:
- Mandibular lengthening procedures demonstrated high accuracy.
- Patient-specific antral distractors achieved favorable outcomes with minor maxillary advancement shortfalls (2-3 mm).
- Excellent occlusion in one cadaver, acceptable anterior occlusion in another, with correctable posterior open bites.
Conclusions:
- Patient-specific antral helical distractors are feasible and show potential for positive outcomes in MMA.
- Custom helical distractors may offer advantages over traditional linear distractors.
- This cadaver study supports the clinical application of patient-specific distraction systems.
