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https://www.readbyqxmd.com/read/28327073/the-influence-of-axial-grooves-on-dislodgment-resistance-of-prosthetic-metal-crowns-in-canine-teeth-of-dogs
#1
Stephanie Goldschmidt, Caitlyn J Collins, Scott Hetzel, Heidi-Lynn Ploeg, Jason W Soukup
The reported failure rate for full veneer crowns of canine teeth of dogs is suboptimal, particularly in teeth with naturally poor retentive features, such as those with low height/diameter (H/D) ratios or high convergence angles (CAs). The objective of the present study was to evaluate the application of axial grooves in an effort to develop a crown preparation design that enhances the retention of full veneer crowns in dogs. Crown dislodgment testing was performed on cast alloy dies of canine teeth with unfavorable retention features (low H/D and high CA) prepared with (n = 14) and without axial grooves (n = 15) to evaluate the force required to dislodge a cemented full veneer crown...
September 2016: Journal of Veterinary Dentistry
https://www.readbyqxmd.com/read/28326710/-finite-elemental-analysis-of-the-influence-of-mandibular-plane-angle-on-the-stress-distribution-of-implant-tooth
#2
Xing Weibin, Zheng Shuxian, Yang Shiyi
OBJECTIVE: Finite elemental analysis of the mechanical characteristics of a first mandibular implant molar under different mandibular plane angles determines the load conditions on the implant, thereby providing guidance for clinical application. METHODS: CT data of three mandibular plane angles (low, average, high) were collected. A finite elemental combination model of a dental implant was constructed. The orthogonal experimental research was designed. Results followed data collection and analysis...
October 1, 2016: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/28325640/computed-tomography-based-3-dimensional-finite-element-analyses-of-various-types-of-plates-placed-for-a-virtually-reduced-unilateral-condylar-fracture-of-the-mandible-of-a-patient
#3
Kazuhiro Murakami, Kazuhiko Yamamoto, Tsutomu Sugiura, Satoshi Horita, Yumiko Matsusue, Tadaaki Kirita
PURPOSE: This study was performed to evaluate stresses in various types of plates placed for a virtually reduced unilateral condylar fracture of the mandible using computed tomography-based 3-dimensional finite element (FE) models of a patient to select the optimal plate system. MATERIALS AND METHODS: A computed tomography-based FE model of the mandible of a patient with a unilateral condylar fracture was constructed. The fracture was virtually reduced and fixed with 1 straight titanium plate; 2 straight titanium plates; 2 straight poly-L-lactic acid plates; and 4-hole (box), 5-hole (strut), and 7-hole (lambda) condylar plates...
February 24, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28321256/biochemical-and-clinical-assessments-of-segmental-maxillary-posterior-tooth-intrusion
#4
Jintana Tasanapanont, Tanapan Wattanachai, Janya Apisariyakul, Peraphan Pothacharoen, Siriwan Ongchai, Prachya Kongtawelert, Marit Midtbø, Dhirawat Jotikasthira
Objective. To compare chondroitin sulphate (CS) levels around maxillary second premolars, first molars, and second molars between the unloaded and the loaded periods and to measure the rates of intrusion of maxillary posterior teeth during segmental posterior tooth intrusion. Materials and Methods. In this prospective clinical study, 105 teeth (from 15 patients exhibiting anterior open bite and requiring maxillary posterior tooth intrusion) were studied. Competitive ELISA was used to detect CS levels. Dental casts (during the unloaded and loaded periods) were scanned, and posterior tooth intrusion distances were measured...
2017: International Journal of Dentistry
https://www.readbyqxmd.com/read/28320537/a-randomized-clinical-trial-comparing-2-ibuprofen-formulations-in-patients-with-acute-odontogenic-pain
#5
Tanjit Taggar, Di Wu, Asma A Khan
INTRODUCTION: Ibuprofen sodium dihydrate, a new formulation of ibuprofen, was introduced with the claim of faster onset of analgesia. Most of the data on this new ibuprofen formulation are drawn from studies using the oral surgery model. Because this model differs significantly from the endodontic pain model, we conducted a study comparing ibuprofen sodium dihydrate with conventional ibuprofen acid in endodontic pain patients. METHODS: This randomized, double-masked study recruited subjects experiencing moderate to severe pain from a tooth diagnosed with symptomatic irreversible pulpitis and symptomatic apical periodontitis (n = 41)...
March 17, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28318918/comparison-of-functional-outcomes-and-patient-reported-satisfaction-between-titanium-and-absorbable-plates-and-screws-for-fixation-of-mandibular-fractures-a-one-year-prospective-study
#6
Maria Belén Leno, Stanley Yung Liu, Chien-Tzung Chen, Han-Tsung Liao
PURPOSE: The aim of this study is to compare the 1-year functional outcomes and patient-reported satisfaction in treating mandibular fractures between resorbable and titanium fixation devices. MATERIALS AND METHODS: A 1-year prospective study was conducted; 41 consecutive patients presenting with mandibular fractures were included. A resorbable system was used in 21 patients, while in 20 patients a titanium fixation device was used. Functional outcome was evaluated objectively at several time points (2, 4 and 6 weeks, 3 and 6 months, and 1 year after surgery)...
February 13, 2017: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/28316106/chironomus-riparius-diptera-genome-sequencing-reveals-the-impact-of-minisatellite-transposable-elements-on-population-divergence
#7
Ann-Marie Oppold, Hanno Schmidt, Marcel Rose, Sören Lukas Hellmann, Florian Dolze, Fabian Ripp, Bettina Weich, Urs Schmidt-Ott, Erwin Schmidt, Robert Kofler, Thomas Hankeln, Markus Pfenninger
Active transposable elements (TEs) may result in divergent genomic insertion and abundance patterns among conspecific populations. Upon secondary contact, such divergent genetic backgrounds can theoretically give rise to classical Dobzhansky-Muller incompatibilities (DMI), thus contributing to the evolution of endogenous genetic barriers and eventually cause population divergence. We investigated differential TE abundance among conspecific populations of the non-biting midge Chironomus riparius and evaluated their potential role in causing endogenous genetic incompatibilities between these populations...
March 18, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28291687/structural-biomechanics-of-the-craniomaxillofacial-skeleton-under-maximal-masticatory-loading-inferences-and-critical-analysis-based-on-a-validated-computational-model
#8
Amir R Pakdel, Cari M Whyne, Jeffrey A Fialkov
BACKGROUND: The trend towards optimizing stabilization of the craniomaxillofacial skeleton (CMFS) with the minimum amount of fixation required to achieve union, and away from maximizing rigidity, requires a quantitative understanding of craniomaxillofacial biomechanics. This study uses computational modeling to quantify the structural biomechanics of the CMFS under maximal physiologic masticatory loading. METHODS: Using an experimentally validated subject-specific finite element (FE) model of the CMFS, the patterns of stress and strain distribution as a result of physiological masticatory loading were calculated...
February 17, 2017: Journal of Plastic, Reconstructive & Aesthetic Surgery: JPRAS
https://www.readbyqxmd.com/read/28291149/binky-bites-and-other-oronasal-pressure-injuries
#9
Louisa B Mook, James B Metz, Stephen C Boos, Kenneth W Feldman
Initial examination and exploration of childhood injuries may not lead to an obvious explanation of abuse. Although abusive oronasal injuries have been described, ones including nasal destruction are rare. We describe 4 children abused using implements that ultimately were thought to have caused significant nasal tissue destruction. In 2 of the cases, a forced pacifier placement was implicated in causing pressure injuries. In the other 2 cases, gags were part of the children's injuries. All 4 children had other findings of abuse and neglect...
March 13, 2017: Pediatric Emergency Care
https://www.readbyqxmd.com/read/28271438/short-term-follow-up-of-masticatory-adaptation-after-rehabilitation-with-an-immediately-loaded-implant-supported-prosthesis-a-pilot-assessment
#10
Mihoko Tanaka, Collaert Bruno, Reinhilde Jacobs, Tetsurou Torisu, Hiroshi Murata
BACKGROUND: When teeth are extracted, sensory function is decreased by a loss of periodontal ligament receptions. When replacing teeth by oral implants, one hopes to restore the sensory feedback pathway as such to allow for physiological implant integration and optimized oral function with implant-supported prostheses. What remains to be investigated is how to adapt to different oral rehabilitations. The purpose of this pilot study was to assess four aspects of masticatory adaptation after rehabilitation with an immediately loaded implant-supported prosthesis and to observe how each aspect will recover respectively...
December 2017: International Journal of Implant Dentistry
https://www.readbyqxmd.com/read/28258640/realistic-kinetic-loading-of-the-jaw-system-during-single-chewing-cycles-a-finite-element-study
#11
S E Martinez Choy, J Lenz, K Schweizerhof, M Schmitter, H J Schindler
Although knowledge of short-range kinetic interactions between antagonistic teeth during mastication is of essential importance for ensuring interference-free fixed dental reconstructions, little information is available. In this study, the forces on and displacements of the teeth during kinetic molar biting simulating the power stroke of a chewing cycle were investigated by use of a finite-element model that included all the essential components of the human masticatory system, including an elastic food bolus...
March 4, 2017: Journal of Oral Rehabilitation
https://www.readbyqxmd.com/read/28256692/-orofacial-alterations-and-surface-electromyography-in-neurodevelopmental-disorders
#12
V Rosell-Clari
INTRODUCTION: Surface electromyography has become a widely used technique for measuring the activity of different muscle groups. Although the reliability and validity of the technique are discussed, there is an important body of scientific literature that defends the use of this technique. AIM: To present through a case study, the two basic uses of surface electromyography: the measurement of orofacial muscular activity and use it as biofeedback modulator of the muscular activity itself...
February 24, 2017: Revista de Neurologia
https://www.readbyqxmd.com/read/28251806/implications-of-vertebrate-craniodental-evo-devo-for-human-oral-health
#13
REVIEW
Julia C Boughner
Highly processed diets eaten by postindustrial modern human populations coincide with higher frequencies of third molar impaction, malocclusion, and temporomandibular joint disorders that affect millions of people worldwide each year. Current treatments address symptoms, not causes, because the multifactorial etiologies of these three concerns mask which factors incline certain people to malocclusion, impaction, and/or joint issues. Deep scientific curiosity about the origins of jaws and dentitions continues to yield rich insights about the developmental genetic mechanisms that underpin healthy craniodental morphogenesis and integration...
March 2, 2017: Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution
https://www.readbyqxmd.com/read/28251665/investigations-into-age-related-changes-in-the-human-mandible
#14
Nicolette M Parr, Nicholas V Passalacqua, Katie Skorpinski
While changes in mandibular shape over time are not widely recognized by skeletal biologists, mandibular remodeling and associated changes in gross morphology may result from a number of causes related to mechanical stress such as antemortem tooth loss, changes in bite force, or alterations of masticatory performance. This study investigated the relationship between age-related changes and antemortem tooth loss in adult humans via dry bone measurements. This study examined 10 standard mandibular measurements as well as individual antemortem tooth loss scores using the Eichner Index from a total of 319 female and male individuals with ages ranging from 16 to 99 years...
March 2, 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/28244122/influence-of-sustained-submaximal-clenching-fatigue-test-on-electromyographic-activity-and-maximum-voluntary-bite-forces-in-healthy-subjects-and-patients-with-temporomandibular-disorders
#15
L Xu, S Fan, B Cai, Z Fang, X Jiang
This study aimed to investigate whether the fatigue induced by sustained motor task in the jaw elevator muscles differed between healthy subjects and patients with temporomandibular disorder (TMD). Fifteen patients with TMD and thirteen age- and sex-matched healthy controls performed a fatigue test consisting of sustained clenching contractions at 30% maximal voluntary clenching(MVC) intensity until test failure(the criterion for terminating the fatigue test was when the biting force decreased by 10% or more from the target force consecutively for >3 seconds)...
February 28, 2017: Journal of Oral Rehabilitation
https://www.readbyqxmd.com/read/28243301/fracture-strength-of-three-unit-implant-supported-fixed-partial-dentures-with-excessive-crown-height-fabricated-from-different-materials
#16
Vahideh Nazari, Safoura Ghodsi, Marzieh Alikhasi, Majid Sahebi, Ahmad Reza Shamshiri
OBJECTIVES: Fracture strength is an important factor influencing the clinical long-term success of implant-supported prostheses especially in high stress situations like excessive crown height space (CHS). The purpose of this study was to compare the fracture strength of implant-supported fixed partial dentures (FPDs) with excessive crown height, fabricated from three different materials. MATERIALS AND METHODS: Two implants with corresponding abutments were mounted in a metal model that simulated mandibular second premolar and second molar...
November 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28239213/effect-of-proteolytic-modification-on-texture-and-mastication-of-heat-treated-egg-white-gels
#17
Junko Funaki, Michiko Minami, Sachie Abe, Reiko Ueda, Wakako Eto, Kenji Kugino, Mutsuko Kugino, Keiko Abe, Kiyoshi Toko, Tomiko Asakura
Raw egg white undergoes sol-gel transition by heat treatment, which changes it to an elastic gel. Here, protease treatment to render a new texture to heated egg white gel was applied. Protease-treated gels exhibited ductile flow without obvious rupture points. Transmission electron microscopy analysis showed that in protease-treated gels, protein aggregates were distributed more homogeneously compared with that observed in the untreated control, probably because ovalbumin was digested into small peptides as revealed by SDS-PAGE...
February 2017: Journal of Food Processing and Preservation
https://www.readbyqxmd.com/read/28216846/three-dimensional-finite-element-analysis-of-the-stress-distribution-pattern-in-a-mandibular-first-molar-tooth-restored-with-five-different-restorative-materials
#18
Kathleen Manuela D'souza, Meena Ajay Aras
INTRODUCTION: Badly broken or structurally compromised posterior teeth are frequently associated with crown/root fracture. Numerous restorative materials have been used to fabricate indirect full-coverage restorations for such teeth. This study aims to evaluate and compare the effect of restorative materials on the stress distribution pattern in a mandibular first molar tooth, under varying loading conditions and to compare the stress distribution pattern in five commonly used indirect restorative materials...
January 2017: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/28209396/changes-in-bite-force-after-orthognathic-surgical-correction-of-mandibular-prognathism-a-systematic-review
#19
REVIEW
I Islam, A A T Lim, R C W Wong
Patients requesting treatment for mandibular prognathism seek functional and aesthetic improvements. Improvements in bite force and efficiency are generally used as measures of better function. It is unclear what effect the surgical correction of mandibular prognathism will have on the patient's occlusal forces. The literature was searched using medical subject heading (MeSH) and key word terms 'bite force', 'osteotomy', 'orthognathic surgery', and 'prognathism'. A total of 17 articles were included in this review...
February 13, 2017: International Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28199931/a-personalized-3d-printed-prosthetic-joint-replacement-for-the-human-temporomandibular-joint-from-implant-design-to-implantation
#20
David C Ackland, Dale Robinson, Michael Redhead, Peter Vee Sin Lee, Adrian Moskaljuk, George Dimitroulis
Personalized prosthetic joint replacements have important applications in cases of complex bone and joint conditions where the shape and size of off-the-shelf components may not be adequate. The objective of this study was to design, test and fabricate a personalized 3D-printed prosthesis for a patient requiring total joint replacement surgery of the temporomandibular joint (TMJ). The new 'Melbourne' prosthetic TMJ design featured a condylar component sized specifically to the patient and fixation screw positions that avoid potential intra-operative damage to the mandibular nerve...
February 6, 2017: Journal of the Mechanical Behavior of Biomedical Materials
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