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https://www.readbyqxmd.com/read/28736808/comparative-cranial-ontogeny-of-tapirus-mammalia-perissodactyla-tapiridae
#1
S Rocio Moyano, Norberto P Giannini
Skull morphology in tapirs is particularly interesting due to the presence of a proboscis with important trophic, sensory and behavioral functions. Several studies have dealt with tapir skull osteology but chiefly in a comparative framework between fossil and recent species of tapirs. Only one study examined an aspect of cranial ontogeny, development of the sagittal crest (Holbrook. J Zool Soc Lond 2002; 256; 215). Our goal is to describe in detail the morphological changes that occur during the postnatal ontogeny of the skull in two representative tapir species, Tapirus terrestris and Tapirus indicus, and to explore possible functional consequences of their developmental trajectories...
July 24, 2017: Journal of Anatomy
https://www.readbyqxmd.com/read/28727163/dental-erosion-among-south-brazilian-adolescents-a-2-5-year-longitudinal-study
#2
C D Brusius, L S Alves, C Susin, M Maltz
OBJECTIVES: This population-based longitudinal study investigated the incidence, progression and risk factors for dental erosion among South Brazilian adolescents. METHODS: Eight hundred and one schoolchildren attending 42 public and private schools were clinically examined at 12 years of age; clinical examinations were repeated after 2.5 years (SD=0.3). After tooth cleaning and drying, permanent incisors and first molars were classified using the Basic Erosive Wear Examination (BEWE) scoring criteria...
July 20, 2017: Community Dentistry and Oral Epidemiology
https://www.readbyqxmd.com/read/28718463/-chewing-on-bruxism-associations-consequences-and-management
#3
F Lobbezoo, R Jacobs, A DE Laat, G Aarab, P Wetselaar, D Manfredini
In this second part of a diptych on bruxism, the focus is on the associations of this masticatory muscle activity with other sleep-related conditions. Its association with the obstructive sleep apnoea syndrome (OSAS) has been a particular object of study. Bruxism seems to play a protective role in OSAS, although the evidence for this is not yet conclusive. Apart from this possible positive consequence, bruxism also has several negative consequences, for which evidence is available to a greater or lesser extent...
July 2017: Nederlands Tijdschrift Voor Tandheelkunde
https://www.readbyqxmd.com/read/28691101/advancing-discontinuous-fiber-reinforced-composites-above-critical-length-for-replacing-current-dental-composites-and-amalgam
#4
Richard C Petersen
Clinicians have been aware that posterior dental particulate-filled composites (PFCs) have many placement disadvantages and indeed fail clinically at an average rate faster than amalgam alloys. Secondary caries is most commonly identified as the chief failure mechanism for both dental PFCs and amalgam. In terms of a solution, fiber-reinforced composites (FRCs) above critical length (Lc) can provide mechanical property safety factors with compound molding packing qualities to reduce many problems associated with dental PFCs...
February 2017: Journal of Nature and Science
https://www.readbyqxmd.com/read/28688272/does-pain-in-the-masseter-and-anterior-temporal-muscles-influence-maximal-bite-force
#5
Marcelo Coelho Goiato, Paulo Renato Junqueira Zuim, Amália Moreno, Daniela Micheline Dos Santos, Emily Vivianne Freitas da Silva, Fernanda Pereira de Caxias, Karina Helga Leal Turcio
OBJECTIVE: The aim of this study was to evaluate changes in pain and muscle force, and the relationship between them, in patients with muscle pain and bruxism, prior to and after treatment. METHODS: Thirty women with bruxism and myofascial pain (Ia) were included in this study. Sleep bruxism diagnosis was made based on clinical diagnostic criteria, and awake bruxism diagnosis was made by patient questionnaires and the presence of tooth wear. The diagnosis of myofascial pain was established according to the Research Diagnostic Criteria for Temporomandibular Disorders (RDC-TMD)...
June 23, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28684832/a-retrospective-audit-of-the-outcome-of-composites-used-to-restore-worn-teeth
#6
D Bartlett, S Varma
Objectives The aim of this audit was to monitor the outcome of composite restorations placed at an increased vertical dimension in patients with severe tooth wear.Methods This convenience sample of patients were treated by 11 specialist trainees in prosthodontics, and restored with direct composites. Exclusion criteria included bruxism, poor medical health and a preference for monitoring rather than intervention. The restorations were placed between 2012 and 2016 and were placed over more than one appointment and the outcome monitored for up to 14 months...
July 7, 2017: British Dental Journal
https://www.readbyqxmd.com/read/28679308/impact-of-systemic-lupus-erythematosus-on-oral-health-related-quality-of-life
#7
J D Corrêa, L G A Branco, D C Calderaro, S M S Mendonça, D V Travassos, G A Ferreira, A L Teixeira, L G Abreu, T A Silva
Oral symptoms in systemic lupus erythematosus (SLE) patients are often unexplored and affect the health-related quality of life. The aims of this study were: (a) to evaluate the oral health condition of SLE patients compared to control subjects without rheumatic diseases; (b) to determine the consequences of oral health condition in the quality of life of these two groups. Individuals with SLE ( n = 75) and without SLE ( n = 78) (control group), paired for gender and age, underwent complete oral examination...
January 1, 2017: Lupus
https://www.readbyqxmd.com/read/28673576/worn-is-born-the-role-of-the-maxillo-mandibular-relation-in-management-of-worn-dentition
#8
Zhongjie Li, Zheng Yang, Tingting Lan, Hanchi Zhao, Yang Liu
Worn dentition, often accompanied by occlusion changes such as reduced vertical dimension, poses a big challenge to both diagnosis and treatment. Current established causes fail to explain the observed tooth wearing patterns, and the treatments based on the documented pathogeneses are often unpredictable and require frequent maintenance. From the perspective of stomatognathic system, we postulate that the role of maxillo-mandibular relation is a crucial part in the tooth wear progression patterns, and should be well addressed in treatment planning...
July 2017: Medical Hypotheses
https://www.readbyqxmd.com/read/28669761/the-origin-of-filter-feeding-in-whales
#9
Jonathan H Geisler, Robert W Boessenecker, Mace Brown, Brian L Beatty
As the largest known vertebrates of all time, mysticetes depend on keratinous sieves called baleen to capture enough small prey to sustain their enormous size [1]. The origins of baleen are controversial: one hypothesis suggests that teeth were lost during a suction-feeding stage of mysticete evolution and that baleen evolved thereafter [2-4], whereas another suggests that baleen evolved before teeth were lost [5]. Here we report a new species of toothed mysticete, Coronodon havensteini, from the Oligocene of South Carolina that is transitional between raptorial archaeocete whales and modern mysticetes...
July 10, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28665850/displacement-of-a-broken-dental-injection-needle-into-the-perivertebral-space
#10
Bayram Sahin, Senem Yildirimturk, Yigit Sirin, Bora Basaran
Dental injection needle breakage is an uncommon problem in dental practice. Displacement of the broken fragment into anatomical spaces is, on the other hand, a serious complication that occurs most commonly during inferior alveolar nerve blocks as a result of material wear, incorrect application of the anesthesia technique, or sudden movement of the patient during injection. Further complications such as infection, trismus, and nerve paralysis may exacerbate the condition and, if not treated adequately, life-threatening conditions may develop over time as the fragment dislodges deeper in soft tissues...
July 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28653362/teeth-penetration-force-of-the-tiger-shark-galeocerdo-cuvier-and-sandbar-shark-carcharhinus-plumbeus
#11
J N Bergman, M J Lajeunesse, P J Motta
This study examined the minimum force required of functional teeth and replacement teeth in the tiger shark Galeocerdo cuvier and the sandbar shark Carcharhinus plumbeus to penetrate the scales and muscle of sheepshead Archosargus probatocephalus and pigfish Orthopristis chrysoptera. Penetration force ranged from 7·7-41·9 and 3·2-26·3 N to penetrate A. probatocephalus and O. chrysoptera, respectively. Replacement teeth required significantly less force to penetrate O. chrysoptera for both shark species, most probably due to microscopic wear of the tooth surfaces supporting the theory shark teeth are replaced regularly to ensure sharp teeth that are efficient for prey capture...
June 27, 2017: Journal of Fish Biology
https://www.readbyqxmd.com/read/28637223/millions-of-years-behind-slow-adaptation-of-ruminants-to-grasslands
#12
Olja Toljagic, Kjetil L Voje, Michael Matschiner, Lee Hsiang Liow, Thomas F Hansen
The Late-Cretaceous appearance of grasses, followed by the Cenozoic advancement of grasslands as dominant biomes, has contributed to the evolution of a range of specialized herbivores adapted to new diets, as well as to increasingly open and arid habitats. Many mammals including ruminants, the most diversified ungulate suborder, evolved high-crowned (hypsodont) teeth as an adaptation to tooth-wearing diets and habitats. The impact of different causes of tooth wear is still a matter of debate, and the temporal pattern of hypsodonty evolution in relation to the evolution of grasslands remains unclear...
June 20, 2017: Systematic Biology
https://www.readbyqxmd.com/read/28630957/optical-profilometry-versus-intraoral-handheld-scanning
#13
Oliver Hartkamp, Florian Peters, Hannes Bothung, Ulrich Lohbauer, Sven Reich
AIM: The aim of this study was to evaluate the difference in maximum height loss values obtained from datasets based on optical profilometry and intraoral scanning. Additionally, two analysis applications were tested with respect to their correspondence. MATERIALS AND METHODS: To obtain baseline data, the occlusal surface of a metal phantom tooth was scanned by optical profilometry [WLP] and an intraoral scanner [IOS]. Then, wear was simulated at two locations of the tooth, three times each ([wear1], [wear2], and [wear3]), and the surface was captured after each status of wear, applying [WLP] and [IOS]...
2017: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/28621269/tooth-wear-patterns-among-khat-and-shammah-users-in-jazan-city-kingdom-of-saudi-arabia-a-cross-sectional-survey
#14
Mohammed E Sayed, Ammar D Hamdi, Bassam M Hakami, Maryam H Mugri, Shilpa H Bhandi
AIM: The effect of Khat and Shammah habits, with the para-functional jaw activities that accompany them, on the structure and integrity of the natural dentition has not yet been investigated. The literature lacks studies that identify the patterns of tooth wear among Khat and Shammah users. Therefore, this study is the first attempt to address this concern in Jazan City population, Kingdom of Saudi Arabia. MATERIALS AND METHODS: A cross-sectional survey study was conducted among 300 recruits among dental clinics in Jazan City, Kingdom of Saudi Arabia from October 1, 2015, to April 30, 2016...
June 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28619974/twenty-nine-month-follow-up-of-a-paediatric-zirconia-dental-crown
#15
Serena Lopez Cazaux, Isabelle Hyon, Tony Prud'homme, Sylvie Dajean Trutaud
The aim of this paper is to present the long-term follow-up of one paediatric zirconia crown on a deciduous molar. Preformed crowns are part of the armamentarium in paediatric dentistry. In recent years, aesthetic alternatives to preformed metal crowns have been developed, first preveneered crowns and then zirconia crowns. This paper describes the restoration of a primary molar with a zirconia crown (EZ-Pedo, Loomis, California, USA) in an 8-year-old boy. In this clinical case, the protocol for the implementation and maintenance of zirconia crowns is detailed...
June 14, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28606421/spontaneous-jaw-muscle-activity-in-patients-with-acquired-brain-injuries-preliminary-findings
#16
Mohit Kothari, Vibeke Louise Funch Madsen, Eduardo E Castrillon, Jørgen Feldbæk Nielsen, Peter Svensson
PATIENTS: High or excessive parafunctional jaw muscle activity is a frequent complication of acquired brain injury (ABI) and may have some similarities to bruxism. Bruxism has been associated with increased tooth wear, masseter hypertrophy and headaches. The aim of this observational study was to identify the levels of jaw muscle activity from fourteen ABI patients having different functional and cognitive levels in their early phase of neurological rehabilitation (according to their Ranchos Los Amigos Scale (RLAS) score)...
June 9, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/28599155/effect-of-acidic-agents-on-the-wear-behavior-of-a-polymer-infiltrated-ceramic-network-picn-material
#17
Ping Yu, Zhou Xu, Dwayne D Arola, Jie Min, Peng Zhao, Shanshan Gao
Polymer infiltrated ceramic network (PICN) materials exhibit desirable properties for replacement of tooth structure. However, their durability and their integrity in various oral environments, remain relatively unknown. The primary objective of this study is to investigate the effect of acidic agents on the wear behavior of PICNs. Twenty specimens were randomly assigned to four groups and then immersed in either deionized water (control) or acidic agents (2% acetic acid, citric acid or lactic acid solutions) at 37℃ for 4 weeks...
June 2, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28581062/dental-evidence-for-wild-tuber-processing-among-titicaca-basin-foragers-7000-ybp
#18
James T Watson, Randall Haas
OBJECTIVES: The objective of this work is to characterize dental wear in a skeletal sample dating to the Middle/Late Archaic period transition (8,000-6,700 cal. B.P.) from the Lake Titicaca Basin, Peru to better define subsistence behaviors of foragers prior to incipient sedentism and food production. MATERIALS AND METHODS: The dental sample consists of 251 teeth from 11 individuals recovered from the site of Soro Mik'aya Patjxa (SMP), the earliest securely dated burial assemblage in the Lake Titicaca Basin and the only burial assemblage in the region from an unequivocal forager context...
June 5, 2017: American Journal of Physical Anthropology
https://www.readbyqxmd.com/read/28556552/does-the-presence-of-unilateral-maxillary-incisor-edge-asymmetries-influence-the-perception-of-smile-esthetics
#19
Joanna Betrine Ribeiro, Bruna Alecrim Figueiredo, Andre Wilson Machado
OBJECTIVE: Determine orthodontists and laypersons' perception of maxillary central and lateral incisor edge asymmetries in full-face and close-up smiles. MATERIAL AND METHODS: Four smile photos were selected for this study: two full-face and two close-up smile photos of two male subjects, a white man and an Afro-descendant man. Both were considered pleasant smiles, following some principles of an ideal smile. Images were digitally altered to create tooth wear asymmetries on the maxillary left central and lateral incisor in 0...
May 27, 2017: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/28555928/impact-of-excessive-gingival-display-on-oral-health-related-quality-of-life-in-a-southern-brazilian-young-population
#20
Raquel Pippi Antoniazzi, Luana de Sena Fischer, Carlos Eduardo Agostini Balbinot, Simone Pippi Antoniazzi, Jovito Adiel Skupien
AIM: to compare oral health-related quality of life (OHRQoL) between individuals with and without excessive gingival display (EGD). MATERIALS AND METHODS: A cross-sectional study was conducted in 53 individuals with EGD and 53 controls matched for sex and age. The outcome was OHRQoL, determined using the Oral Health Impact Profile (OHIP-14) and self-perceptions of satisfaction with smile esthetics. A clinical exam was conducted to evaluate the smile line, color of the teeth, tooth wear and malocclusion...
May 28, 2017: Journal of Clinical Periodontology
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