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2. A case of epidermoid cyst arising in the masticator muscle space with bone absorption.

Author

Ogata, Kinuko, Koga, Takamitsu, Zaima, Hirotaka, Katase, Naoki, Sumi, Misa, and Ohba, Seigo

Abstract

Epidermoid cysts develop through the inclusion of the ectoderm or epithelial tissue. They mostly occur at the floor of the mouth, but rarely at other loci in the oral region. Here, we report a case of an epidermoid cyst arising in the masticator muscle space. The patient was a 60-year-old man who was referred to our hospital complaining of swelling and pain in the inner part of the right mandibular ramus. Computed tomography and magnetic resonance imaging revealed a monocytic lesion in the right masticatory muscle and pterygomandibular space. Compressive bone resorption was observed on the buccal side of the maxillary right molar alveolar bone and lingual side of the right mandibular ramus cortical bone. The lesion was enucleated under the clinical diagnosis of cyst or benign tumor in the right masticatory muscle space. Histopathological findings showed that the resected specimen has a cyst wall lined with a layer of squamous epithelium with parakeratosis, but without skin appendages. Thus, this was diagnosed as an epidermoid cyst. Recurrences did not occur 41 months after the surgery. [ABSTRACT FROM AUTHOR]

Published
2024
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5. Occlusal Plane Angle as a Key Factor for Chin Protrusion After Mandibular Osteotomy in Skeletal Class III

Author

Shido, Rena, Morita, Yukiko, Nishioka-Sakamoto, Kie, Narahara, Shun, Koga, Takamitsu, Yoshida, Noriaki, Asahina, Izumi, Ohba, Seigo, Shido, Rena, Morita, Yukiko, Nishioka-Sakamoto, Kie, Narahara, Shun, Koga, Takamitsu, Yoshida, Noriaki, Asahina, Izumi, and Ohba, Seigo

Abstract

There is no treatment algorithm to decide whether maxillomandibular or mandibular osteotomy alone should be performed in borderline cases. This study assessed the factors that affect the changes in soft tissue after mandibular setback. Patients who underwent mandibular osteotomy alone to correct mandibular protrusion were included in this study. Hard and soft tissue analyses were performed on lateral cephalograms before and 12±3 months after surgery. The popular points were set for referencing hard and soft tissues on the lateral cephalogram. Nasolabial, labiomental, and soft tissue facial plane angles were measured for the soft tissue assessment. To assess the mandibular setback amount, SNB was calculated. Twenty-one patients were included in this study. The nasolabial angle was increased after surgery and its change significantly correlated with the change in SNB (P=0.00815). The change in soft tissue facial plane angle after surgery per change in SNB significantly correlated with the occlusal plane angle (P=0.0009). An occlusal plane angle of at least 15.45 degrees was required for the SNB and soft tissue facial plane angle to change to the same degree. The occlusal plane angle (whether or not it was ≥15.45 degrees) may help in determining the surgical approach in borderline cases, specifically on whether maxillomandibular or mandibular osteotomy alone should be performed if the mandibular setback is simple., Journal of Craniofacial Surgery, 34(8), pp.2343-2346; 2023

Published
2023

10. Clinical Safety Assessment of Autologous Freeze-Drying Platelet-Rich Plasma for Bone Regeneration in Maxillary Sinus Floor Augmentation: A Pilot Study

Author

Koga, Takamitsu, Nakatani, Yuya, Ohba, Seigo, Hara, Masahito, Sumita, Yoshinori, Nagai, Kazuhiro, Asahina, Izumi, Koga, Takamitsu, Nakatani, Yuya, Ohba, Seigo, Hara, Masahito, Sumita, Yoshinori, Nagai, Kazuhiro, and Asahina, Izumi

Abstract

The purpose of this clinical study is to evaluate the safety and preliminary efficacy of autologous freeze-drying platelet-rich plasma (FD-PRP) on bone regeneration in maxillary sinus floor augmentation as a preliminary pilot study. Five patients that required sinus floor augmentation to facilitate the placement of dental implants participated in this clinical study. The PRP was prepared from the autologous peripheral blood and was lyophilized and stored at −20 °C for 4 weeks before surgery. At surgery, triple-concentrated FD-PRP (x3FD-PRP) mixed with synthetic bone grafting materials was rehydrated following the transplantation into the sinus floor. The primary outcome was a safety verification of x3FD-PRP, evaluated in terms of the clinical course and consecutive blood tests. The secondary outcome was clinical efficacy focused on bone regeneration in sinus floor augmentation evaluated by radiographic examination and implant stability. There were no adverse events, such as systemic complications, excessive inflammatory reactions, severe infection, or local site healing complications, besides those on the usual course associated with surgery. Vertical augmented height was maintained, and the initial stability of implants was achieved post-operatively in 6 months. The results obtained in this study suggest that x3FD-PRP can be used safely for bone engineering in clinical practice. Further studies are required to draw a conclusion concerning the efficacy of x3FD-PRP since this was a pilot study with a single arm and a small sample size., Journal of Clinical Medicine, 10(8), art. no. 1678; 2021

Published
2021

20. Physiological positioning strategy alters condylar position after mandibular ramus sagittal split osteotomies for mandibular prognathism.

Author

Ohba, Seigo, Miura, Kei-ichirou, Koga, Takamitsu, Kawasaki, Takako, Asahina, Izumi, Ozaki, Hiroya, and Yoshida, Noriaki

Subjects
ORTHOGNATHIC surgery, MANDIBULAR prosthesis, CONDYLARTHRA, COMPUTED tomography, POSTOPERATIVE care, CEPHALOMETRY, MANDIBULAR condyle, PROGNATHISM, PHYSIOLOGY
Abstract

Objective: The aim of this study was to elucidate the physiological position of the proximal segment for postoperative jaw movement in patients with mandibular prognathism.Methods: Twenty-two patients with mandibular prognathism were treated by orthognathic surgery using bilateral mandibular sagittal split ramus osteotomies (SSRO) with a physiological positioning strategy. The skeletal stability was assessed, and the movement of the proximal segment was evaluated by cephalography and computed tomography performed preoperatively, immediately postoperatively, and one year postoperatively.Results: The patients were divided into two groups: the stable group (SNB relapse <1.5°) and the relapse group (SNB relapse ≥1.5°). In the stable group at one year postoperatively, the average SNB relapse was only 0.29° (7%), the condylar head had moved posteriorly by 0.75 mm, and the proximal segment had rotated counterclockwise by 1.2°.Conclusion: This new physiological positioning strategy improves the position of the condyle compared with the preoperative position in patients with mandibular prognathism. [ABSTRACT FROM AUTHOR]

Published
2018
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25. Physiological positioning strategy alters condylar position after mandibular ramus sagittal split osteotomies for mandibular prognathism.

Author

Ohba S, Ozaki H, Miura KI, Koga T, Kawasaki T, Yoshida N, and Asahina I

Subjects
Adolescent, Adult, Cephalometry, Female, Humans, Male, Mandibular Condyle diagnostic imaging, Prognathism diagnostic imaging, Tomography, X-Ray Computed, Young Adult, Mandibular Condyle physiology, Osteotomy, Sagittal Split Ramus, Prognathism physiopathology, Prognathism surgery
Abstract

Objective: The aim of this study was to elucidate the physiological position of the proximal segment for postoperative jaw movement in patients with mandibular prognathism., Methods: Twenty-two patients with mandibular prognathism were treated by orthognathic surgery using bilateral mandibular sagittal split ramus osteotomies (SSRO) with a physiological positioning strategy. The skeletal stability was assessed, and the movement of the proximal segment was evaluated by cephalography and computed tomography performed preoperatively, immediately postoperatively, and one year postoperatively., Results: The patients were divided into two groups: the stable group (SNB relapse <1.5°) and the relapse group (SNB relapse ≥1.5°). In the stable group at one year postoperatively, the average SNB relapse was only 0.29° (7%), the condylar head had moved posteriorly by 0.75 mm, and the proximal segment had rotated counterclockwise by 1.2°., Conclusion: This new physiological positioning strategy improves the position of the condyle compared with the preoperative position in patients with mandibular prognathism.

Published
2018
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