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mandibular relation

Jinyuan Guo, Tongyue Wang, Jeong Joon Han, Seunggon Jung, Min-Suk Kook, Hong-Ju Park, Hee-Kyun Oh
OBJECTIVES: The aim of this study was to evaluate corrective outcome and transverse stability after orthognathic surgery via a surgery-first approach (SFA) in mandibular prognathism with and without facial asymmetry using 3-dimensional analysis. STUDY DESIGN: Twenty-nine patients who received mandibular setback surgery using SFA were divided into 2 groups according to the menton deviation (4 mm): symmetry group (n = 17) and asymmetry group (n = 12). Using computed tomography images obtained before (T0), immediately after (T1), and 6 months after (T2) surgery, time-dependent changes in variables related to facial asymmetry, including maxillary height, ramal length, frontal and lateral ramal inclination, mandibular body length, and mandibular body height, were evaluated...
February 5, 2018: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
Ji-Hye Kim, Ae Ri Kim, Yun Hui Choi, Aeryun Kim, Yongsung Sohn, Gye-Hyeong Woo, Jeong-Heon Cha, Eun-Jung Bak, Yun-Jung Yoo
BACKGROUND: Periodontitis is an infectious disease that manifests as alveolar bone loss surrounding the roots of teeth. Diabetes aggravates periodontitis-induced alveolar bone loss via suppression of bone formation. Intermittent parathyroid hormone (PTH) administration displays an anabolic effect on bone. In this study, we investigated the effect of intermittent PTH administration on alveolar bone loss in type 1 diabetic rats with periodontitis. METHODS: Rats were divided into control (C), periodontitis (P), periodontitis treated with PTH (P + PTH), diabetes with periodontitis (DP), and diabetes with periodontitis treated with PTH (DP + PTH) groups...
March 15, 2018: Journal of Translational Medicine
Bruno Tochetto Primo, Leonardo Marcos Mezzari, Luís Carlos da Fontoura Frasca, Raquel Linderman, Elken Gomes Rivaldo
PURPOSE: To evaluate and compare the clinical and radiographic outcomes of mandibular rehabilitation with fixed prostheses on three implants with immediate versus delayed loading. MATERIALS AND METHODS: The sample comprised 21 patients who underwent treatment with immediate loading and 23 who received delayed loading. All had worn their prostheses for at least 18 months. Radiographic evaluation of bone loss was carried out in Adobe Photoshop CS5 by a single calibrated examiner using digitized panoramic radiographs...
March 15, 2018: International Journal of Oral & Maxillofacial Implants
Charlotte Wilson, Joe Iwanaga, Rod J Oskouian, R Shane Tubbs
Trauma to the mandible can occasionally be a life-threatening event. Although extremely rare with only 56 reported patients in the English language, fracture of the floor of the middle cranial fossa with protrusion of the mandibular condyle into the middle cranial fossa was first reported in 1963 by Dingman. The authors review the anatomy of the temporomandibular joint in relation to the middle cranial fossa and demonstrate the possible complications due to condylar intrusion with anatomical dissection.
March 14, 2018: Journal of Craniofacial Surgery
Rafael Ferreira E Costa, Marina Reis Oliveira, Marisa Aparecida Cabrini Gabrielli, Valfrido Antônio Pereira-Filho, Eduardo Hochuli Vieira
The objective of this study was to review the medical records of patients with a history of mandibular angle fracture who were attended at the Service of Oral and Maxillofacial Surgery and Traumatology of FOAr/UNESP in the last 5 years. The data collected were subjected to chi-squared test (significance level of 5%). The authors reviewed 19 medical records. The main cause was physical aggression (58.00%), but with no statistical difference in relation to the other etiologies (P > 0.05). Regarding the type of fixation, one 2...
March 13, 2018: Journal of Craniofacial Surgery
Sofía Pestoni, Federico Javier Degrange, Claudia Patricia Tambussi, María Manuela Demmel Ferreira, Germán Alfredo Tirao
The cranio-mandibular complex is an important structure involved in food capture and processing. Its morphology is related to the nature of the food item. Jaw muscles enable the motion of this complex and their study is essential for functional and evolutionary analysis. The present study compares available behavioral and dietary data obtained from the literature with novel results from functional morphological analyses of the cranio-mandibular complex of the Guira cuckoo (Guira guira) to understand its relationship with the zoophagous trophic habit of this species...
March 13, 2018: Journal of Morphology
Woong Ki Kim, Sunjai Kim
STATEMENT OF PROBLEM: Because of their relatively small scanning area, intraoral scanners may result in less accurate fixed dental prostheses (FDPs) than do laboratory scanners. PURPOSE: The purpose of this in vitro study was to evaluate the accuracy of monolithic zirconia FDPs with different numbers of pontics fabricated with different impression techniques. MATERIAL AND METHODS: The mandibular right premolars and molars of an acrylic resin model were prepared to receive 4-unit FDPs...
March 8, 2018: Journal of Prosthetic Dentistry
Jonathan P Wiens, Gary R Goldstein, Mark Andrawis, Mijin Choi, Jennifer W Priebe
STATEMENT OF PROBLEM: Multiple definitions of centric relation (CR) have evolved over time that may have created confusion or impeded understanding. A recent attempt to achieve a singular definition by surveying the members of the Academy of Prosthodontics (AP) did not achieve majority consensus. PURPOSE: The purpose of this study was to identify those aspects or attributes within the existing definitions of CR in which there was agreement or disagreement among the members of the AP...
March 8, 2018: Journal of Prosthetic Dentistry
Hsiang-Hsi Hong, Adrienne Hong, Yi-Fang Huang, Heng-Liang Liu
Micro-computed tomography (micro-CT) was employed to relate the root surface area (RSA) to the periodontal attachment levels (PALs) of extracted premolars to diagnose periodontitis. Single-rooted human maxillary and mandibular premolars 31 and 36, respectively, were surveyed by micro-CT and its associated software. RSA levels from the 1st to 10th mm, corono-apically, were analyzed using statistical t tests. The average root length (RL) and RSA of the maxillary and mandibular premolars were significantly different (p < 0...
2018: PloS One
Vinni Arora, Rekha Sharma, Sonal Chowdhary
The objective of this study was to evaluate and compare the effects of PowerScope and Forsus in the treatment of Class II division 1 malocclusion. Materials and Methods This was a 2-arm parallel, double-blind, randomized, controlled trial. A total of 28 Class II division 1 malocclusion patients indicated for treatment with fixed functional appliances were randomized and equally divided (n = 14) among PowerScope (American Orthodontics, Sheboygan, Wis; mean age 14.11 ± 1.3 years) and Forsus (3M Unitek Corp, Monrovia, Calif; mean age 15...
March 8, 2018: Angle Orthodontist
Shehab A Aly, Doha Alyan, Mona S Fayed, Maged S Alhammadi, Yehya A Mostafa
AIM: The objective of the present study was to investigate success rates and associated factors affecting temporary anchorage device (TAD) failure in different biomechanical applications. METHODS: A total of 180 TADs were used as a part of 82 patients' treatment plan (24 males and 58 females); their mean age was 21.41 years. Three types of TADs were used: 50 (3M ESPE, Neuss, Germany), 56 (Bone screw; Jeil Medical, Seoul, Korea), and 74 (Morelli, Sorocaba, Brazil)...
March 6, 2018: Journal of Investigative and Clinical Dentistry
Zhong Du, Hai-Long Ma, Zhi-Yuan Zhang, Jia-Wei Zheng, Yan-An Wang
A TIE2 mutation causing arginine-to-tryptophan substitution at residue 849 ( TIE2-R849W ) is commonly identified in heredofamilial venous malformation. However, there is no in vivo model to confirm the pathogenic role of TIE2-R849W . Humanized TIE2-R849W plasmid was constructed via PCR-mediated site-directed mutagenesis. After transcription and micro-injection, TIE2-R849W significantly induces multiple malformations in zebrafish: caudal vein plexus (CVP) defect, eye abnormalities, forebrain formation perturbations, and mandibular malformation...
2018: International Journal of Medical Sciences
András Forster, Gábor Braunitzer, Máté Tóth, Balázs P Szabó, Márk Fráter
PURPOSE: Molar MOD (mesial-occlusal-distal) cavity preparation weakens relative cuspal stiffness by up to 63%, often resulting in cuspal fracture. This investigation inspects fracture resistance of MOD cavities restored using direct composite restoration. MATERIALS AND METHODS: 120 extracted, intact mandibular molars were selected. MOD cavities with different depth/wall thickness were prepared in 9 groups (n = 12): A: 3 mm/3.5 mm, B: 3 mm/2.5 mm, C: 3 mm/1.5 mm, D: 5 mm/3...
March 5, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
Cristina Valles, Xavier Rodriguez-Ciurana, Fernando Muñoz, Maria Permuy, Henar López-Alonso, Jose Nart
OBJECTIVES: To analyze bone remodeling and peri-implant soft tissues around platform-switching implants with and without a machined collar placed at different levels in relation to bone crest. MATERIAL AND METHODS: All mandibular premolars and the first molars were extracted in five dogs. At 6 months, six implants with and without a machined neck (MACH and GBAE implants, respectively) were randomly inserted in each hemimandible positioning the implant-abutment interface in either a supracrestal (+1...
March 5, 2018: Journal of Clinical Periodontology
Sumanth Kumbargere Nagraj, Eachempati Prashanti, Himanshi Aggarwal, Ashok Lingappa, Murugan S Muthu, Salian Kiran Kumar Krishanappa, Haszelini Hassan
BACKGROUND: Post-extraction bleeding (PEB) is a recognised, frequently encountered complication in dental practice, which is defined as bleeding that continues beyond 8 to 12 hours after dental extraction. The incidence of post-extraction bleeding varies from 0% to 26%. If post-extraction bleeding is not managed, complications can range from soft tissue haematomas to severe blood loss. Local causes of bleeding include soft tissue and bone bleeding. Systemic causes include platelet problems, coagulation disorders or excessive fibrinolysis, and inherited or acquired problems (medication induced)...
March 4, 2018: Cochrane Database of Systematic Reviews
Ying Liu, Kun Geng, Yanhao Chu, Mindi Xu, Lagabaiyila Zha
The purpose of this study is to provide a forensic reference data about estimating chronologic age by evaluating the third molar mineralization of Han in central southern China. The mineralization degree of third molars was assessed by Demirjian's classification with modification for 2519 digital orthopantomograms (1190 males, 1329 females; age 8-23 years). The mean ages of the initial mineralization and the crown completion of third molars were around 9.66 and 13.88 years old in males and 9.52 and 14.09 years old in females...
March 3, 2018: International Journal of Legal Medicine
Grace Chiu, Chris Chang, W Eugene Roberts
A 36-year-old woman with good periodontal health sought treatment for a compensated Class II partially edentulous malocclusion associated with a steep mandibular plane (SN-MP, 45°), 9 missing teeth, a 3-mm midline discrepancy, and compromised posterior occlusal function. She had multiple carious lesions, a failing fixed prostheses in the mandibular right quadrant replacing the right first molar, and a severely atrophic edentulous ridge in the area around the mandibular left first and second molars. After restoration of the caries, the mandibular left third molar served as anchorage to correct the mandibular arch crowding...
March 2018: American Journal of Orthodontics and Dentofacial Orthopedics
Walid El Kininy, Shane Davy, Leo Stassen, Denis Stephen Barry
Variations in the relationship of the retromandibular vein to the facial nerve have been widely reported due to their relevance for surgical approaches in parotid, osteotomy and mandibular condyle surgery. In the context of the retromandibular retroparotid approach, remaining deep to the retromandibular vein is advised to decrease the likelihood of encountering the facial nerve during mandibular condyle surgery. In the present report, an unusual variant of the superficial temporal vein lying superficial to the facial nerve is described...
March 3, 2018: Folia Morphologica (Warsz)
Burcu Bal, Idil Dikbas, Ozlem Malkondu, Koray Oral
BACKGROUND: The aim of this study was to estimate the prevalence of ramus asymmetries related to age and gender in a young population and the influence of growth spurt on ramus asymmetry. MATERIALS AND METHODS: The study consisted of 776 panoramic radiographs of individuals aged 9 to 21 years (335 males and 441 females). Individuals were divided into two groups with respect of linear growth spurt as age 12 in females and age 14 in males. The first group consisted of females aged between 9-11 and males between 9-13...
March 3, 2018: Folia Morphologica (Warsz)
Stephen L Greene, Chung How Kau, Somsak Sittitavornwong, Kathlyn Powell, Noel K Childers, Mary MacDougall, Ejvis Lamani
Cleidocranial dysplasia (CCD, MIM 119600) is a rare autosomal dominant disorder affecting bone, cartilage, craniofacial growth, and tooth formation leading to supernumerary teeth. Few reports delineate the genotype-phenotype correlations related to the variations in craniofacial morphology and patterning of the dentition and the complexity of treating patient's malocclusion. Successful management of the craniofacial deformities in patients with CCD requires a multidisciplinary team of healthcare specialists...
March 1, 2018: Journal of Craniofacial Surgery
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