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Yi-Tai Jou
In the last few decades, neurobiological and human brain imaging research have greatly advanced our understanding of brain mechanisms that support perception and memory, as well as their function in daily activities. Knowledge of the neurobiological mechanisms behind the deafferentation of stomatognathic systems has also expanded greatly in recent decades. In particular, current studies reveal that the peripheral deafferentations of stomatognathic systems may be projected globally into the central nervous system (CNS) and become an associated critical factor in triggering and aggravating neurodegenerative diseases...
April 2018: Kaohsiung Journal of Medical Sciences
T Wagner, J Page, M Burniston, A Skillen, J C Ross, R Manwani, D McCool, P N Hawkins, Ashutosh D Wechalekar
PURPOSE: 18 F-Florbetapir has been reported to show cardiac uptake in patients with systemic light-chain amyloidosis (AL). This study systematically assessed uptake of 18 F-florbetapir in patients with proven systemic amyloidosis at sites outside the heart. METHODS: Seventeen patients with proven cardiac amyloidosis underwent 18 F-florbetapir PET/CT imaging, 15 with AL and 2 with transthyretin amyloidosis (ATTR). Three patients had repeat scans. All patients had protocolized assessment at the UK National Amyloidosis Centre including imaging with 123 I-serum amyloid P component (SAP)...
April 12, 2018: European Journal of Nuclear Medicine and Molecular Imaging
Caroline Vieira Lucena, Marcelo Lacerda, Rafael Caldas, Fernando Buarque De Lima Neto, Diego Rativa
There is a direct relationship between the prevalence of musculoskeletal disorders of the temporomandibular joint and orofacial disorders. A well-elaborated analysis of the jaw movements provides relevant information for healthcare professionals to conclude their diagnosis. Different approaches have been explored to track jaw movements such that the mastication analysis is getting less subjective; however, all methods are still highly subjective, and the quality of the assessments depends much on the experience of the health professional...
2018: IEEE Journal of Translational Engineering in Health and Medicine
Ömer Dursun, Tamer Çankaya
GOAL: The aim of this study was to assess temporomandibular joint dysfunction in patients with stroke. MATERIALS AND METHODS: Total of 100 participants, 50 healthy and 50 who had stroke, were recruited into this study. Digital caliper and algometer were used to assess temporomandibular joint range of motion and masticatory muscle pressure pain threshold. Labial commissure angle measurement was used for the assessment of facial paralysis severity. Fonseca questionnaire was used for temporomandibular joint dysfunction assessment and categorization...
April 9, 2018: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
Federico Biglioli, Federico Bolognesi, Fabiana Allevi, Dimitri Rabbiosi, Silvia Cupello, Antonino Previtera, Alessandro Lozza, Valeria M A Battista, Claudio Marchetti
Recent facial paralyses, in which fibrillations of the mimetic muscles are still detectable by electromyography (EMG), allow facial reanimation based on giving new neural stimuli to musculature. However, if more time has elapsed, mimetic muscles can undergo irreversible atrophy, and providing a new neural stimulus is simply not effective. In these cases function is provided by transferring free flaps into the face or transposing masticatory muscles to reinstitute major movements, such as eyelid closure and smiling...
March 14, 2018: Journal of Cranio-maxillo-facial Surgery
Cynthia M de A Godoy, Luana Celi Silva Aprígio, Eudes Paiva de Godoy, Mariana Camara Furtado, Daniel Coelho, Lourdes Bernadete Rocha de Souza, Antònio Manuel Goveial de Oliveira
BACKGROUND: Roux-en-Y gastric bypass (RYGB) surgery often leads to food intolerance, especially protein intake. AIM: This is to investigate the association of food intolerance with protein intake and chewing parameters in patients who underwent RYGB surgery 2 years prior. METHODS: An observational study was carried out in 30 patients aged between 18 and 60 years old with at least a 2-year postoperative period since undergoing RYGB surgery...
April 6, 2018: Obesity Surgery
Jonathan Lomas, Taylan Gurgenci, Christopher Jackson, Duncan Campbell
BACKGROUND: Orofacial pain is a common presentation in the primary healthcare setting and temporomandibular dysfunction represents one of the major causes. Its aetiology is multifactorial, caused by both masticatory muscle dysfunction and derangement within the temporomandibular joint. OBJECTIVE: The aim of this article is to provide an overview of temporomandibular dysfunction, its management and referral considerations for general practioners. DISCUSSION: Temporomandibular joint dysfunction affects a large number of adults...
April 2018: Australian journal of general practice
José Cristiano Ramos Glória, Ighor Andrade Fernandes, Esmeralda Maria da Silveira, Glaciele Maria de Souza, Ricardo Lopes Rocha, Endi Lanza Galvão, Saulo Gabriel Moreira Falci
Introduction  Mandibular fractures represent a high percentage of all facial fractures, and the bite force is a fundamental parameter to measure the actual mandibular function and, subsequently, the masticatory efficiency and quality of life. Objectives  The purpose of the present systematic review was to verify if there is any difference in the bite forces of patients with mandibular fractures fixed by locking or non-locking plates, testing the null hypothesis of no difference in this parameter. Data Synthesis  A systematic review of the literature was conducted using four databases (PubMed, Virtual Health Library, Web of Science and Science Direct) without restrictions as to publication date or language...
April 2018: International Archives of Otorhinolaryngology
Nandakishore Sahoo, Dibyajyoti Boruah, Ankur Thakral, Rahul Kumar, Indranil Deb Roy
Background: Temporomandibular joint (TMJ) ankylosis is one of the most disruptive maladies afflicting the masticatory system. The characteristic feature is the formation of bony mass bridging condyle with glenoid fossa. The exact pathogenesis is, however, not completely understood. Purpose: To investigate and compare histomorphometric features of ankylosed condylar specimen with normal condylar process. Materials and Methods: Group I included 17 post-traumatic unilateral TMJ ankylosis patients managed by excision of ankylosed mass and interpositional arthroplasty...
June 2018: Journal of Maxillofacial and Oral Surgery
Bernd Kordaß, Alexandra Quooß, Diana John, Sebastian Ruge
Occlusion is a central aspect of all prosthetic restorations, including complete dentures. Within the follow-up (SHIP 1) of the regional population-based "Study of Health in Pomerania" (SHIP), a number of 3300 study participants were examined concerning the occlusion of artificial teeth in purely mucosa and non-implant-borne complete dentures. These subjects were representative of the population. Therefore, occlusal bite registrations obtained in habitual intercuspation (IP) were made and were digitally evaluated with the Greifswald Digital Analyzing System (GEDAS) software based on transparent contact areas...
2018: International Journal of Computerized Dentistry
Kujtim Shala, Arlinda Tmava-Dragusha, Linda Dula, Teuta Pustina-Krasniqi, Teuta Bicaj, Enis Ahmedi, Zana Lila
OBJECTIVE: This study aimed to evaluate maximum bite forces (mBF) in dominant (DS) and non-dominant sides (NDS) at certain time periods after the insertion of new complete dentures based on prior experience and gender. MATERIALS AND METHODS: A total of 88 patients, complete denture wearers (CDWs), were examined. The maximum bite force at the intercuspal position between the first molars in 3 seconds was registered and recorded with piezoelectric gnathodynamometer...
March 15, 2018: Open Access Macedonian Journal of Medical Sciences
Ricardo Miguel Godinho, Laura C Fitton, Viviana Toro-Ibacache, Chris B Stringer, Rodrigo S Lacruz, Timothy G Bromage, Paul O'Higgins
Modern humans have smaller faces relative to Middle and Late Pleistocene members of the genus Homo. While facial reduction and differences in shape have been shown to increase biting efficiency in Homo sapiens relative to these hominins, facial size reduction has also been said to decrease our ability to resist masticatory loads. This study compares crania of Homo heidelbergensis and H. sapiens with respect to mechanical advantages of masticatory muscles, force production efficiency, strains experienced by the cranium and modes of deformation during simulated biting...
May 2018: Journal of Human Evolution
Chengalvarayan Sasikala, N Gopi Chander
AIM: The purpose of the study was to evaluate and compare the flexural strength of nano-reinforced zirconia feldspathic porcelain, lithium disilicate ceramics, and zirconia. MATERIALS AND METHODS: Ten bar-shaped specimens of computer-aided design (CAD)/computer-aided manufacturing (CAM) zirconia, reinforced feldspathic porcelain, and reinforced lithium disilicate were fabricated in accordance to International Organization for Standardization (ISO 6872; n = 10). Feldspathic porcelain and lithium disilicate ceramic specimens were reinforced with 5, 10, 15, and 20% of zirconia nanoparticles through a customized technique...
March 1, 2018: Journal of Contemporary Dental Practice
Cássio Volponi Carvalho, Luciana Saraiva, Flávio Paim Falcão Bauer, Rui Yoshio Kimura, Maria Luisa Silveira Souto, Carlos Cheque Bernardo, Cláudio Mendes Pannuti, Giuseppe Alexandre Romito, Francisco Emílio Pustiglioni
INTRODUCTION: Aggressive periodontitis (AP) is a condition that promotes breakdown of the periodontal tissues in a short time. In severe cases, pathologic migration of teeth and tooth loss can occur, producing esthetic and functional problems for the patient. Orthodontic treatment may be recommended to restore esthetics and masticatory function. We assessed the effects of orthodontic movement in the periodontal tissues of treated patients with AP. METHODS: Ten subjects (ages 25...
April 2018: American Journal of Orthodontics and Dentofacial Orthopedics
Sangeeta J Nair, I N Aparna, B Dhanasekar, Nayana Prabhu
The restoration of normal function and esthetics is often challenging in the prosthetic rehabilitation of patients with hemimandibulectomy defects due to unstable occlusion and mandibular deviation. The extensive period of time for completion of healing of the reconstructed mandible through reconstructive plastic surgery and/or implant-assisted prosthesis may compromise the masticatory function by causing delay in the fabrication of definitive prosthesis. This case report describes a novel technique for the construction of customized attachment-retained mandibular guiding flange prosthesis for immediate rectification of the frontal plane rotation occurring after hemimandibulectomy...
January 2018: Contemporary Clinical Dentistry
Claire D Tewksbury, Kathryn X Callaghan, Brent A Fulks, Geoffrey E Gerstner
OBJECTIVE: Mammalian mastication serves to improve intra-oral food reduction. Insufficient food reduction creates potential swallowing problems, whereas over-reduction may accelerate tooth wear and increase feeding time. Either extreme has consequences. The study's objectives were: (1) to study the relationship between food reduction, number of chews in a sequence, and chewing rate, (2) to study how controlling the number of chews and chewing rate variability affects food reduction, and (3) to assess how dentoskeletal morphological and electromyographical (EMG) characteristics impact food reduction...
March 20, 2018: Archives of Oral Biology
Zhuo Haiya, Hu Zhou, Zhao Qing
This case report describes the treatment of a 25-year-old woman with a severe open bite. This patient presented a grade Ⅲ open bite, considerably thin alveolar bone, and evident labial buccal and lingual root form. The open bite was corrected by fixed orthodontic treatment and masticatory exercises. However, the increased pressure in the labial muscle caused by lip muscle exercise suppressed the canines, which resulted in the protrusion of the apices of canine roots out of the alveolar bone. Afterward, HX brackets, instead of self-locking, were used and bonded reversely in the occlusal-gingival direction on the upper canines...
February 1, 2018: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
Hyun Seok, Seong-Gon Kim, Min-Keun Kim, Insan Jang, Janghoon Ahn
Background: The objective of this study was to evaluate the influence of masticatory muscle injection of botulinum toxin type A (BTX-A) on the growth of the mandibular bone in vivo. Methods: Eleven Sprague-Dawley rats were used, and BTX-A ( n  = 6) or saline ( n  = 5) was injected at 13 days of age. All injections were given to the right masseter muscle, and the BTX-A dose was 0.5 units. All of the rats were euthanized at 60 days of age. The skulls of the rats were separated and fixed with 10% formalin for micro-computed tomography (micro-CT) analysis...
December 2018: Maxillofacial Plastic and Reconstructive Surgery
Susan Coiner-Collier, Erin R Vogel, Robert S Scott
Past attempts to establish a relationship between mandibular morphology and different dietary categories (e.g., frugivore, folivore, insectivore) have had mixed results, possibly because descriptive dietary categories are too broad and obscure variation within primate diets. Another potential reason is that not all aspects of skeletal architecture, especially trabecular anisotropy, have factored into functional assessments of dietary inputs into jaw form. Recent emphasis on quantifying food mechanical properties (FMPs) has provided an alternative to reliance on dietary categories...
March 23, 2018: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
Irfan Qamruddin, Mohammad Khursheed Alam, Habiba Abdullah, Muhammad Abdullah Kamran, Nausheen Jawaid, Verda Mahroof
Objective: The aim of this study was to assess the analgesic effect of a single application of low-level laser therapy (LLLT) on spontaneous pain and pain on chewing after placement of initial archwires. Methods: Forty-two patients (26 women, 16 men) were randomly recruited for this split-mouth randomized clinical trial. Each patient received super-elastic nickel-titanium (NiTi) initial archwires (0.012, 0.014, 0.016, and 0.018-inch [in]) in the maxilla for leveling and alignment for an interval of 4 weeks between archwires...
March 2018: Korean Journal of Orthodontics
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