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https://www.readbyqxmd.com/read/28637223/millions-of-years-behind-slow-adaptation-of-ruminants-to-grasslands
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
https://www.readbyqxmd.com/read/28540109/whistle-abrasion-a-case-report
#10
T Pereira, S Shetty, M Chande, P Kamath
Abrasion is the physical wearing of a tooth surface which can involve the presence of a foreign object repeatedly being in contact with the tooth. A 40-year-old male patient reported to our dental clinic with a 2-3 mm uneven gap between his upper and lower front teeth on occlusion. A detailed history revealed that he was a physical education teacher, and the habitual placement of the whistle for the last 15 years caused an indentation on the whistle which coincided with the abraded teeth. Conditions such as abrasion may need active restorations...
November 2016: Annals of Medical and Health Sciences Research
https://www.readbyqxmd.com/read/28523304/optical-coherence-tomography-applications-in-tooth-wear-diagnosis
#11
Veronica MercuŢ, Sanda Mihaela Popescu, Monica Scrieciu, Marina Olimpia Amărăscu, Mihaela Vătu, Oana Andreea Diaconu, Eugen Osiac, Ştefan Mugurel Ghelase
Dental wear represents an irreversible loss of dental hard tissue under the action of physical, chemical and mechanical factors, excluding dental caries and acute trauma. Four clinical forms of dental wear are described: erosion, attrition, abfraction, and abrasion. Most experts agree that in each clinical form multiple etiological factors are involved, one being predominant. Optical coherence tomography (OCT) is a non-invasive optical method characterized by a micronic resolution. The applications of this type of investigation are multiple in the medical field in recent years, and OCT is gaining a growing importance in dentistry...
2017: Romanian Journal of Morphology and Embryology, Revue Roumaine de Morphologie et Embryologie
https://www.readbyqxmd.com/read/28521915/a-tall-rostral-hook-in-a-medieval-horse-premolar-tooth
#12
Suvi Viranta, Kristiina Mannermaa
Development of dental abnormalities due to improper occlusal wear is common among modern domestic horses. This phenomenon often is attributed to jaw conformation. Rostral mandibular hooks may develop in horses with underjet or mandibular prognathism, a condition where the lower jaw protrudes forward, beyond the upper jaw. Less abrasive diet, free of phytoliths and matrix-like plant fibers, also may promote enamel and focal overgrowths of equine dentition. Here we report a rostral mandibular hook in a lower premolar tooth of a medieval horse, found in a spring deposit in Levänluhta, Osthrobothnia, Finland...
June 2017: International Journal of Paleopathology
https://www.readbyqxmd.com/read/28510377/retrospective-study-of-the-survival-and-patient-satisfaction-with-composite-dahl-restorations-in-the-management-of-localised-anterior-tooth-wear
#13
Ayman Aljawad, Jeremy Simon Rees
OBJECTIVE: This retrospective study was undertaken to evaluate the clinical performance of direct composite restorations placed at an increased vertical dimension to manage localised anterior tooth wear using the Dahl approach. SUBJECTS AND METHODS: Two hundred and ninety six restorations were placed at an increased OVD in 41 subjects with localized anterior Tooth Surface Loss (TSL) were included. Survival analysis was carried out at three levels, major failure only, minor failure only and all types of failure...
December 2016: European Journal of Prosthodontics and Restorative Dentistry
https://www.readbyqxmd.com/read/28502655/earliest-mysticete-from-the-late-eocene-of-peru-sheds-new-light-on-the-origin-of-baleen-whales
#14
Olivier Lambert, Manuel Martínez-Cáceres, Giovanni Bianucci, Claudio Di Celma, Rodolfo Salas-Gismondi, Etienne Steurbaut, Mario Urbina, Christian de Muizon
Although combined molecular and morphological analyses point to a late middle Eocene (38-39 million years ago) origin for the clade Neoceti (Odontoceti, echolocating toothed whales plus Mysticeti, baleen whales, and relatives), the oldest known mysticete fossil dates from the latest Eocene (about 34 million years ago) of Antarctica [1, 2]. Considering that the latter is not the most stemward mysticete in recent phylogenies and that Oligocene toothed mysticetes display a broad morphological disparity most likely corresponding to contrasted ecological niches, the origin of mysticetes from a basilosaurid ancestor and its drivers are currently poorly understood [1, 3-8]...
May 22, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28490846/reliability-of-intra-oral-camera-using-teledentistry-in-screening-of-oral-diseases-pilot-study
#15
Kalyana Chakravarthy Pentapati, Preetinanda Mishra, Mehrshad Damania, Siddharth Narayanan, Garima Sachdeva, Geetanshu Bhalla
OBJECTIVE: Reliability of intra-oral camera using teledentistry in screening of oral diseases. METHODOLOGY: A trained and calibrated examiner used intra-oral camera to capture videos of oral cavity along with clinical examination to evaluate caries, plaque, calculus, tooth wear and fluorosis, stains in children. RESULTS: The mean DT and DMFT were significantly higher with use of intra-oral camera than with clinical examination (p = 0.001 and 0...
April 2017: Saudi Dental Journal
https://www.readbyqxmd.com/read/28478930/erosion-of-canine-teeth-in-babirusa-genus-babyrousa
#16
Alastair A Macdonald
Patterns of wear on the canine teeth were examined in 260 adult male babirusa skulls. Video recordings of 161 adult male babirusas at salt licks in North Sulawesi were viewed for behaviour related to erosion of the canine teeth. Corresponding observations were made of the behaviour of male babirusa in Antwerp and Surabaya Zoos. Most loss of maxillary canine dental tissue was from the ventro-lateral or lateral surface of the tooth, towards its distal end. The teeth were smoothly flattened on a plane approximating to the plane formed on the side of the face by the snout, the zygion and the zygomatic process...
May 2017: Comptes Rendus Biologies
https://www.readbyqxmd.com/read/28477392/validity-of-different-tools-to-assess-sleep-bruxism-a-meta-analysis
#17
REVIEW
E Casett, J C Réus, J Stuginski-Barbosa, A L Porporatti, M C Carra, M A Peres, G de Luca Canto, D Manfredini
This systematic review and meta-analysis (MA) aimed to evaluate the diagnostic validity of questionnaires, clinical assessment and portable diagnostic devices compared to the reference standard method polysomnography (PSG) in assessing sleep bruxism (SB). Two reviewers searched electronic databases for diagnostic test accuracy studies that compared questionnaires, clinical assessment or portable diagnostic devices for SB, with the reference standard method PSG, comprising previous studies from all languages and with no restrictions regarding age, gender or time of publication...
May 6, 2017: Journal of Oral Rehabilitation
https://www.readbyqxmd.com/read/28469825/correlation-between-micro-hardness-and-mineral-content-in-healthy-human-enamel
#18
Anna Akkus, Daniel Karasik, Renato Roperto
BACKGROUND: Enamel is the hardest and the stiffest tissue in the human body. The enamel undergoes multidirectional stresses, withstands multimillion chewing cycles, all while protecting the internal dentin and pulp from damage due to mechanical overload and exposure to the harsh chemical environment of the mouth. Raman spectroscopy allows to study enamel mineral content in a non-destructive and site-specific way. While Raman spectroscopy has been applied in other studies to assess tooth mineralization, there are no studies that examine the relationship between micro-hardness and mineral content of the untreated enamel...
April 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28463690/impact-of-wear-and-diet-on-molar-row-geometry-and-topography-in-the-house-mouse
#19
Sabrina Renaud, Ronan Ledevin
OBJECTIVES: Dental evolution affects the geometry of the tooth, but the adaptive relevance of these changes is related to tooth sharpness, complexity, and relief (topography). On a set of laboratory mice, we assessed how wear related to age and food consistency affected molar geometry and topography. DESIGN: Three groups of laboratory inbred mice (C57BL/6J strain) were considered: Four week old mice close to weaning, six month old mice fed on regular rodent pellets, and six month old mice fed on rodent pellets that were powdered and served as jelly...
April 24, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28459247/conservative-functional-and-esthetic-rehabilitation-of-severe-palatal-erosion-class-iv-using-modified-dahl-approach
#20
Aliasger Tunkiwala, Rajeev Chitguppi
This article demonstrates the clinical application of biomechanical and occlusal principles to conservatively provide optimal clinical outcomes in restoring an eroded anterior dentition. The authors manage a challenging case involving limited palatal clearance (ie, deep bite) coupled with palatal erosion and wear by combining the centric relation (CR) and Dahl principles to create anterior interocclusal space to reduce the need for more invasive palatal reduction. The combined use of adhesive restorations-resin composites on the palatal surface and indirect porcelain veneers on the facial/incisal surfaces-through enamel and dentin bonding helped optimize esthetic and functional/biomechanical aspects...
May 2017: Compendium of Continuing Education in Dentistry
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