mandibular outer cortex

BACKGROUND AND OBJECTIVE: A cross-sectional study was conducted to evaluate a clinically relevant position of the inferior alveolar nerve and canal with respect to the lateral cortex, alveolar crest, and first and second molar root apices in adult dentate patients. METHODS: The study was conducted in the patients who reported various oral and maxillofacial surgical procedures at the Department of Oral and Maxillofacial Surgery for whom preoperative computed tomography (CT) scan was taken for the required surgical procedures...

OBJECTIVES: The aim of this study was to investigate the bone area in the posterior region, which is important for mandibular molar distalization in skeletal class I and class III individuals with normodivergent and hyperdivergent vertical growth patterns. MATERIALS AND METHODS: In this retrospective study, cone-beam computed tomography (CBCT) scans of 120 individuals divided into 4 groups as class I normodivergent (group-I), class I hyperdivergent (group-II), class III normodivergent (group-III), and class III hyperdivergent (group-IV)...

BACKGROUND: The primary objectives of mandibular surgery are to achieve optimal occlusion, low sensory disturbance, and adequate fixation with early movement. In-depth knowledge of the mandibular structure is required to achieve these goals. This study used computed tomography (CT) to evaluate the mandibular cortical thickness and cancellous space according to age and sex. METHODS: We enrolled 230 consecutive patients, aged 20 to 50 years, who underwent CT scanning...

INTRODUCTION: This study aimed to evaluate the posterior available space (PAS) in both dental arches of adult patients with varying skeletal patterns using cone-beam computed tomography. METHODS: A sample of 114 adult patients (56 males and 58 females) was divided into 3 groups according to ANB angle and facial height ratio. Using C-mode cone-beam computed tomography images from these patients, maxillary PAS (MxPAS) and mandibular PAS (MnPAS) were measured in the distobuccal and palatal roots of the maxillary second molars and the distal roots of the mandibular second molars, respectively...

Mandibular angle osteotomy with outer cortex grinding has become the preferred cosmetic procedure for correcting square faces. After surgery, bone hyperplasia at the mandibular angle affects the operation result. This study evaluated the effect of the masticatory muscles on bone repair. From January 2016 to January 2019, patients who underwent mandibular angle osteotomy with outer cortex grinding were retrospectively reviewed. Computed tomography data of these patients were collected, and the bone volume of the mandibular angle changes and its correlation with masticatory muscle morphology were analyzed...

PURPOSE: The aim of this study was to investigate the position and course of mandibular canal in patients with prognathism using cone-beam CT(CBCT)，and explore its clinical significance. METHODS: The mandibles of 28 patients with skeletal Class Ⅲ prognathism (10 males and 18 females) and 20 normal people(12 males and 8 females) were analyzed on CBCT. The position and course of mandibular canal from the lowest point of mandibular foramen to the first molar were measured at five specific sections from the mandibular foramen to the mandibular first molar area, including inner and outer diameter, mandibular bone thickness ,distance between mandibular canal and distance to the buccal and lingual bone cortex, and the inferior border of mandible bone...

OBJECTIVES: To evaluate bone height and thickness in the mandibular buccal shelf region and to compare differences between anatomical sites according to gender, side and vertical and sagittal skeletal patterns. SETTINGS AND SAMPLE POPULATION: Multislice Computed Tomography (MSCT) images of 94 subjects (51 females and 43 males) were previously obtained as part of preoperative planning for orthognathic surgery. METHODS: Measurements were performed in three different regions of the mandibular buccal shelf: mesially, towards the central groove and distally to the second molars...

Eruption disturbances in permanent mandibular first molars (PM1s) are uncommon. This retrospective study aimed to investigate differences in the position of the mandibular canal in relation to PM1s, with or without, eruption disturbances. Panoramic and cross-sectional views were reconstructed from cone-beam computed tomography imaging of children with PM1 eruption disturbances. Distances from the most inferior margin of the mandible to the center of the mandibular canal (M-C) and from the outer margin of the lingual cortex to the center of the mandibular canal (L-C) were measured for normally erupted PM1s (normal group) and for PM1s with eruption disturbances (ED group) and compared using independent t -tests...

Immediate implant placement (IIP) is considered a reliable procedure, with survival rates of 94.9%-98.4%. Nevertheless, in the posterior mandible, it poses a high risk of damage to anatomic structures. The aim of this study was to determine the risk of anatomic structures injury associated with IIP in the posterior mandible based on apical primary stability, respecting a safe distance from the inferior alveolar nerve and lingual plate, and to evaluate the influence of different factors on those risks. Pre-extraction cone beam computed tomography scans of 100 patients were retrospectively analyzed...

BACKGROUND: As the pursuit of higher self-attractiveness grows, an increasing number of middle-aged people are unsatisfied with their facial contour and required osteotomy. However, for these patients, performing osteotomy only would accelerate the aging process. Herein, the authors put forward simultaneous surgery for contouring the prominent zygoma and mandible with facelift for elderly patients. METHODS: Patients were divided into 3 groups: group A with prominent mandible, group B with protruding zygoma, and group C with prominent mandible and zygoma...

BACKGROUND: Facial asymmetry combined with a prominent mandibular angle is common in the population. Its treatment involves two or three stages of surgeries. Generally, orthognathic surgery is a top priority. However, some patients with no severe occlusion disorders focus on the appearance and could not accept complex therapeutic procedures. This study evaluated the surgical effect of en bloc mandibular angle-body-chin curved ostectomy (MABCCO) combined with traditional mandibular angle curved ostectomy (MACO) and bilateral outer cortex grinding (OCG) to correct facial asymmetry and a prominent mandibular angle...

OBJECTIVE: Facial asymmetry is one of common complaints in plastic and craniofacial surgery in Orient. Hemimandibular dysplasia has considered to be the key role in facial asymmetry. Despite of the undergrow of mandibular length and height, the lackness of mandibular thickness contributes to the asymmetry. The aim of this study was to describe the therapeutic efficiency of mandibular augmentation with a new sandwich osteotomy with interpositional natural coral and coralline hydroxyapatite (CHA)...

OBJECTIVE: To clarify the relationship between the cross-sectional morphology of the mandible and vertical, transverse, and anteroposterior facial skeletal patterns using statistical shape analysis and structural equation modeling (SEM). MATERIALS AND METHODS: We used 150 cone beam computed tomography (CBCT) images to obtain three-dimensional (3D) facial landmarks and cross-sectional images of the mandible. The morphology of the inner and outer cortices of the mandible was analyzed using statistical shape analysis, including generalized Procrustes analysis and principal component analysis (PCA)...

OBJECTIVE: To investigate horizontal maxillary osteotomy stability after using bone grafts for the treatment of patients with unilateral cleft lip and palate (UCLP). DESIGN: Retrospective cohort study. SETTING: Plastic surgery hospital. PATIENTS: Fifty-eight patients with UCLP and maxillary hypoplasia requiring a maxillary Le Fort I advancement of 6 to 9 mm. INTERVENTIONS: The test group (TG) was comprised of 28 patients who underwent mandibular outer cortex bone grafting in the gaps created by a modified Le Fort I osteotomy...

Mandibular angle osteotomy (MAO) and mandibular angle splitting osteotomy (MASO) are the two main surgical approaches used to correct a square mandible for a desirable aesthetic appearance. However, there are concerns about the safety and accuracy of both procedures as they may lead to unsatisfactory results such as injury to the nerve. To achieve symmetry and security we designed and evaluated a 3-dimensional printed surgical template, which indicates the outer cortex splitting line of the MASO, and the curved cutting line of the MAO...

BACKGROUND: Cherubism is an autosomal dominant syndrome characterized by excessive bilateral maxillomandibular bony degeneration and fibrous tissue hyperplasia. Conservative management is the preferred treatment as cherubism has a self-limiting course. Functional or emotional disturbances may, however, demand surgical intervention. We report a patient who underwent surgical intervention. METHOD/DESCRIPTION: He had significant enlargement of lower cheeks and bilateral lower lid scleral show...

BACKGROUND: Several methods are available for mandibular reduction, and each method is characterized by unique limitations and complications. However, only a few studies have systematically analyzed these complications. This study aimed to investigate the effects of the outcome of performing curved mandibular angle ostectomy and outer cortex grinding in 1-stage operation and to examine the causes of different types and characteristics of complications. METHODS: The subjects consisted of 528 patients who were subjected to curved mandibular angle ostectomy and outer cortex grinding in 1-stage operation through an intraoral approach...

BACKGROUND: Mandibular angle ostectomy is one of the most common surgical procedures for facial contouring in Asian women. However, some patients complain about mandibular angle hypertrophy recurrence after surgery. The present study evaluated volumetric change of the mandible after angle ostectomy and outer cortex grinding. METHODS: Twenty-four patients who underwent bilateral mandibular angle ostectomy and outer cortex grinding from 2013 to 2016 were enrolled...

BACKGROUND: Sagittal resection of the mandible has been widely used to reduce the width of the lower face and is usually carried out in combination with a mandibular contouring procedure. However, the surgical outcomes of this procedure are unclear because sagittal resection is rarely performed as a single procedure. The authors clarify misunderstandings regarding this procedure and introduce an improved strategic approach for sagittal resection of the mandible. METHODS: Under general anesthesia, mandible contouring was performed first with a curved osteotomy, followed by sagittal resection of the outer cortex of mandible...

BACKGROUND: Autologous bone grafts are still the best materials for calvarial reconstruction. In the past, rib, iliac crest, and cranial bone have been used for the reconstruction of the calvarial defects. However, the use of mandibular outer cortex bone graft in calvarial defects reconstruction is poorly reported in literature. This study focused on using the mandibular outer cortex bone grafts for calvarial defects. METHODS: From October 2004 to July 2016, there were a total of 13 patients in this study who underwent cranioplasty with mandibular outer cortex bone grafts to reconstruction calvarial defects...