Biomechanical analysis of skeletal open bite treatment methods: a comparative finite element study

Area of Science:

• Orthodontics
• Biomechanical analysis
• Craniofacial development

Background:

• Skeletal anterior open bite malocclusion presents complex treatment challenges.
• Various orthodontic appliances aim to correct this condition, but their biomechanical effects differ.
• Understanding these differences is vital for effective treatment planning.

Purpose of the Study:

• To compare the biomechanical effects of zygomatic anchorage plates, vertical chin-caps, and occipital headgear.
• To evaluate stress distribution and displacement patterns in dentofacial structures.
• To inform treatment strategy selection for skeletal anterior open bite.

Main Methods:

• Three-dimensional finite element models were created from CT data.
• Simulations of zygomatic anchorage, vertical chin-cap, and occipital headgear were generated.
• Forces were applied, and stress (Von Mises, minimum principal) and displacement were analyzed.

Main Results:

• Zygomatic anchorage resulted in the highest stress in the posterior maxilla and zygomaticomaxillary suture.
• Peak stress on dental structures was observed at the maxillary first molar root with zygomatic anchorage.
• Greatest tooth and root intrusion was predicted with zygomatic anchorage.
• Vertical chin-cap showed higher condylar stress.

Conclusions:

• Zygomatic anchorage-supported intrusion yields greater posterior maxillary intrusion and stress concentration.
• Distinct biomechanical profiles exist among these orthodontic appliances.
• Appliance selection should consider these biomechanical differences for skeletal anterior open bite treatment.