| รหัสดีโอไอ | 10.14457/TU.the.2022.1478 |
|---|---|
| Title | Comparison of stress distribution on the articular disc between the Hunsuck/Epker and NM-Low Z plasty technique for mandibular setback procedure: finite element analysis |
| Creator | Chutiwat Sakyanun |
| Contributor | Narissaporn Chaiprakit, Advisor |
| Publisher | Thammasat University |
| Publication Year | 2022 |
| Keyword | Angle’s class III, Prognathism, Temporomandibular joint, Bilateral sagittal split osteotomy, Osteotomy, Sagittal split ramus, BSSO, Hunsuck/Epker, modified BSSO, Low Z plasty, Orthognathic surgery, Finite element analysis |
| Abstract | The Novel Modification of Low Z plasty (NM-Low Z) technique is a bilateral sagittal split osteotomy (BSSO) technique in which the incision line is designed to create more inferior support at the proximal segment compared to the Hunsuck/Epker (HE) modification. This study aimed to evaluate and compare the stress distribution patterns at the articular disc of thetemporomandibular joint (TMJ) using the NM-Low Z technique and HE modification in mandibular prognathism models. Finite element models of the mandible, including the TMJ, were segmented using the NM-Low Z and HE modification techniques. The mandible was moved 7 mm posteriorly and fixed with 2.0 mm miniplates and screws. The material propertiesof the articular discs were simulated as homogenous, isotropic, and linearly elastic materials. Finite element analysis was used to evaluate the equivalent von Mises stress on the articular disc of the TMJ. Various muscular and biting forces were applied to simulate 1, 3, and 12 months postoperatively in both models. The maximum von Mises stresses of the articular discin the NM-Low Z model were 60.64, 36.43, and 76.38, while those of the HE modificationmodel were 73.40, 29.94, and 82.51 at 1, 3, and 12 months, respectively. Both techniques resulted in normal stress distribution patterns on the articular disc surface. In conclusion, the NM-Low Z technique is an option for BSSO in terms of providing a lower maximum von Mises stress at the articular disc than the HE modification technique, while also providing a normal stress distribution pattern similar to the HE modification technique. |
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Digital File #1 |