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Homologies of the Anterior Teeth in Lndriidae and a Functional Basis for Dental Reduction in Primates
Homologies of the Anterior Teeth in lndriidae and a Functional Basis for Dental Reduction in Primates PHILIP D. GINGERICH Museum of Paleontology, The University of Michigan, Ann Arbor, Michigan 48109 KEY WORDS Dental reduction a Lemuriform primates . Indriidae . Dental homologies - Dental scraper . Deciduous dentition - Avahi ABSTRACT In a recent paper Schwartz ('74) proposes revised homologies of the deciduous and permanent teeth in living lemuriform primates of the family Indriidae. However, new evidence provided by the deciduous dentition of Avahi suggests that the traditional interpretations are correct, specifically: (1) the lat- eral teeth in the dental scraper of Indriidae are homologous with the incisors of Lemuridae and Lorisidae, not the canines; (2) the dental formula for the lower deciduous teeth of indriids is 2.1.3; (3) the dental formula for the lower perma- nent teeth of indriids is 2.0.2.3;and (4)decrease in number of incisors during pri- mate evolution was usually in the sequence 13, then 12, then 11. It appears that dental reduction during primate evolution occurred at the ends of integrated in- cisor and cheek tooth units to minimize disruption of their functional integrity. Anterior dental reduction in the primate Schwartz ('74) recently reviewed the prob- family Indriidae illustrates a more general lem of tooth homologies in the dental scraper problem of direction of tooth loss in primate of Indriidae and concluded that no real evi- evolution. All living lemuroid and lorisoid pri- dence has ever been presented to support the mates (except the highly specialized Dauben- interpretation that indriids possess four lower tonid share a distinctive procumbent, comb- incisors and no canines. -
Non-Syndromic Occurrence of True Generalized Microdontia with Mandibular Mesiodens - a Rare Case Seema D Bargale* and Shital DP Kiran
Bargale and Kiran Head & Face Medicine 2011, 7:19 http://www.head-face-med.com/content/7/1/19 HEAD & FACE MEDICINE CASEREPORT Open Access Non-syndromic occurrence of true generalized microdontia with mandibular mesiodens - a rare case Seema D Bargale* and Shital DP Kiran Abstract Abnormalities in size of teeth and number of teeth are occasionally recorded in clinical cases. True generalized microdontia is rare case in which all the teeth are smaller than normal. Mesiodens is commonly located in maxilary central incisor region and uncommon in the mandible. In the present case a 12 year-old boy was healthy; normal in appearance and the medical history was noncontributory. The patient was examined and found to have permanent teeth that were smaller than those of the average adult teeth. The true generalized microdontia was accompanied by mandibular mesiodens. This is a unique case report of non-syndromic association of mandibular hyperdontia with true generalized microdontia. Keywords: Generalised microdontia, Hyperdontia, Permanent dentition, Mandibular supernumerary tooth Introduction [Ullrich-Turner syndrome], Chromosome 13[trisomy 13], Microdontia is a rare phenomenon. The term microdontia Rothmund-Thomson syndrome, Hallermann-Streiff, Oro- (microdentism, microdontism) is defined as the condition faciodigital syndrome (type 3), Oculo-mandibulo-facial of having abnormally small teeth [1]. According to Boyle, syndrome, Tricho-Rhino-Phalangeal, type1 Branchio- “in general microdontia, the teeth are small, the crowns oculo-facial syndrome. short, and normal contact areas between the teeth are fre- Supernumerary teeth are defined as any supplementary quently missing” [2] Shafer, Hine, and Levy [3] divided tooth or tooth substance in addition to usual configuration microdontia into three types: (1) Microdontia involving of twenty deciduous and thirty two permanent teeth [7]. -
Pediatric Oral Pathology. Soft Tissue and Periodontal Conditions
PEDIATRIC ORAL HEALTH 0031-3955100 $15.00 + .OO PEDIATRIC ORAL PATHOLOGY Soft Tissue and Periodontal Conditions Jayne E. Delaney, DDS, MSD, and Martha Ann Keels, DDS, PhD Parents often are concerned with “lumps and bumps” that appear in the mouths of children. Pediatricians should be able to distinguish the normal clinical appearance of the intraoral tissues in children from gingivitis, periodontal abnormalities, and oral lesions. Recognizing early primary tooth mobility or early primary tooth loss is critical because these dental findings may be indicative of a severe underlying medical illness. Diagnostic criteria and .treatment recommendations are reviewed for many commonly encountered oral conditions. INTRAORAL SOFT-TISSUE ABNORMALITIES Congenital Lesions Ankyloglossia Ankyloglossia, or “tongue-tied,” is a common congenital condition characterized by an abnormally short lingual frenum and the inability to extend the tongue. The frenum may lengthen with growth to produce normal function. If the extent of the ankyloglossia is severe, speech may be affected, mandating speech therapy or surgical correction. If a child is able to extend his or her tongue sufficiently far to moisten the lower lip, then a frenectomy usually is not indicated (Fig. 1). From Private Practice, Waldorf, Maryland (JED); and Department of Pediatrics, Division of Pediatric Dentistry, Duke Children’s Hospital, Duke University Medical Center, Durham, North Carolina (MAK) ~~ ~ ~ ~ ~ ~ ~ PEDIATRIC CLINICS OF NORTH AMERICA VOLUME 47 * NUMBER 5 OCTOBER 2000 1125 1126 DELANEY & KEELS Figure 1. A, Short lingual frenum in a 4-year-old child. B, Child demonstrating the ability to lick his lower lip. Developmental Lesions Geographic Tongue Benign migratory glossitis, or geographic tongue, is a common finding during routine clinical examination of children. -
Dental Anomalies: Foundational Articles and Consensus Recommendations, 2021
Dental Anomalies: Foundational Articles and Consensus Recommendations, 2021 Adekoya-Sofowora CA. Natal and neonatal teeth: a review. Niger Postgrad Med J 2008;15:38-41 Al-Ani AH, Antoun JS, Thomson WM, Merriman TR, Farella M. Hypodontia: An Update on Its Etiology, Classification, and Clinical Management. Biomed Res Int. 2017:9378325. doi.org/10.1155/2017/9378325. Anthonappa RP, King NM, Rabie AB. Aetiology of supernumerary teeth: A literature review. Eur Arch Paediatr Dent. 2013;14:279-88. Dashash, M. Yeung CA, Jamous I, Blinkhorn A. Interventions for the restorative care of amelogenesis imperfecta in children and adolescents. Cochrane Database Syst Rev 2013;6:CD007157. Gallacher A, Ali R, Bhakta S. Dens invaginatus: diagnosis and management strategies. Br Dent J 2016;221:383-7. Gill DS, Barker CS. The multidisciplinary management of hypodontia: a team approach. Br Dent J 2015;218:143-9. Khalaf K, Miskelly J, Voge E, Macfarlane TV. Prevalence of hypodontia and associated factors: a systematic review and meta-analysis. J Orthod. 2014; 41:299-316. Lammi L. Arte S, Somer M, Javinen H, et al. Mutations in AXIN2 cause familial tooth agenesis and predispose to colorectal cancer. Am. J. Hum. Genet. 2004, 74:1043–1050. Marvin ML, Mazzoni S, Herron CM, Edwards S, et al. AXIN2-associated autosomal dominant ectodermal dysplasia and neoplastic syndrome. Am J Med Genet A. 2011,155 898–902. Seow WK. Developmental defects of enamel and dentine: Challenges for basic science research and clinical management. Aust Dent J 2014;59:143-54. Shields ED, Bixler D, El-Kafrawy AM. A proposed classification for heritable human dentine defects with a description of a new entity. -
Oral Structure, Dental Anatomy, Eruption, Periodontium and Oral
Oral Structures and Types of teeth By: Ms. Zain Malkawi, MSDH Introduction • Oral structures are essential in reflecting local and systemic health • Oral anatomy: a fundamental of dental sciences on which the oral health care provider is based. • Oral anatomy used to assess the relationship of teeth, both within and between the arches The color and morphology of the structures may vary with genetic patterns and age. One Quadrant at the Dental Arches Parts of a Tooth • Crown • Root Parts of a Tooth • Crown: part of the tooth covered by enamel, portion of the tooth visible in the oral cavity. • Root: part of the tooth which covered by cementum. • Posterior teeth • Anterior teeth Root • Apex: rounded end of the root • Periapex (periapical): area around the apex of a tooth • Foramen: opening at the apex through which blood vessels and nerves enters • Furcation: area of a two or three rooted tooth where the root divides Tooth Layers • Enamel: the hardest calcified tissue covering the dentine in the crown of the tooth (96%) mineralized. • Dentine: hard calcified tissue surrounding the pulp and underlying the enamel and cementum. Makes up the bulk of the tooth, (70%) mineralized. Tooth Layers • Pulp: the innermost noncalsified tissues containing blood vessels, lymphatics and nerves • Cementum: bone like calcified tissue covering the dentin in the root of the tooth, 50% mineralized. Tooth Layers Tooth Surfaces • Facial: Labial , Buccal • Lingual: called palatal for upper arch. • Proximal: mesial , distal • Contact area: area where that touches the adjacent tooth in the same arch. Tooth Surfaces • Incisal: surface of an incisor which toward the opposite arch, the biting surface, the newly erupted “permanent incisors have mamelons”: projections of enamel on this surface. -
Effect of Posters and Mobile-Health Education Strategies on Teething Beliefs and Oral Health Knowledge Among Mothers in Nairobi
EFFECT OF POSTERS AND MOBILE-HEALTH EDUCATION STRATEGIES ON TEETHING BELIEFS AND ORAL HEALTH KNOWLEDGE AMONG MOTHERS IN NAIROBI. DR. REGINA MUTAVE JAMES REGISTRATION NUMBER: V91/96427/2014 Department of Periodontology/Community and Preventive Dentistry THESIS SUBMITTED IN FULFILMENT OF THE DOCTOR OF PHILOSOPHY DEGREE (PhD) IN COMMUNITY AND PREVENTIVE DENTISTRY, UNIVERSITY OF NAIROBI DECLARATION: I, Regina Mutave James hereby declare that this is my original work and that it has not been submitted by any other person for research purpose, degree or otherwise in any other university or institution. Signed ………………………………………. Date ………………………………. Regina Mutave James R.M.J PhD Thesis - 2015 Page i SUPERVISORS’ DECLARATION This research thesis has been submitted for the fulfillment of the requirement for the award of PhD in Community and Preventive Dentistry with our approval as supervisors. Supervisors: Signed ………………………………..Date……………………………. Prof. Loice W. Gathece BDS., MPH., PhD( Nbi). Department of Periodontology/ Community and Preventive Dentistry, University of Nairobi. Signed ………………………………..Date……………………………. Prof. Arthur M. Kemoli BDS (Nbi)., MSc (UvA)., PhD (UvA). Department of Pediatric Dentistry and Orthodontics, University of Nairobi. R.M.J PhD Thesis - 2015 Page ii DEDICATION To the Almighty, for His unending Grace! R.M.J PhD Thesis - 2015 Page iii ACKNOWLEDGEMENTS My PhD studies including this thesis were made possible by the financial support that I received from the University of Nairobi, and I am grateful for the opportunity. I wish to thank my supervisors Prof. Loice Gathece and Prof Arthur Kemoli who were always there to offer guidance and encouragement throughout the process. My sincere appreciation for my family and friends who stood by me even when I had no time for them and especially my children Erick, Aileen, Mbithe and Jynette. -
Veterinary Dentistry Basics
Veterinary Dentistry Basics Introduction This program will guide you, step by step, through the most important features of veterinary dentistry in current best practice. This chapter covers the basics of veterinary dentistry and should enable you to: ü Describe the anatomical components of a tooth and relate it to location and function ü Know the main landmarks important in assessment of dental disease ü Understand tooth numbering and formulae in different species. ã 2002 eMedia Unit RVC 1 of 10 Dental Anatomy Crown The crown is normally covered by enamel and meets the root at an important landmark called the cemento-enamel junction (CEJ). The CEJ is anatomically the neck of the tooth and is not normally visible. Root Teeth may have one or more roots. In those teeth with two or more roots the point where they diverge is called the furcation angle. This can be a bifurcation or a trifurcation. At the end of the root is the apex, which can have a single foramen (humans), a multiple canal delta arrangement (cats and dogs) or remain open as in herbivores. In some herbivores the apex closes eventually (horse) whereas whereas in others it remains open throughout life. The apical area is where nerves, blood vessels and lymphatics travel into the pulp. Alveolar Bone The roots are encased in the alveolar processes of the jaws. The process comprises alveolar bone, trabecular bone and compact bone. The densest bone lines the alveolus and is called the cribriform plate. It may be seen radiographically as a white line called the lamina dura. -
Teliangectaticum Granuloma Associated to a Natal Tooth Granuloma Telangiectásico Asociado a Diente Natal
www.medigraphic.org.mx Revista Odontológica Mexicana Facultad de Odontología Vol. 20, No. 1 January-March 2016 pp 29-32 CASE REPORT Teliangectaticum granuloma associated to a natal tooth Granuloma telangiectásico asociado a diente natal Katherine Vásquez Sanjuán,* Ary López Álvarez,§ Jonathan Harris RicardoII ABSTRACT RESUMEN Oral teliangectaticum granuloma, also known as pyogenic granuloma Granuloma telangiectásico bucal, también conocido como granulo- is a proliferation of exuberant granulation tissue caused by chronic ma piógeno, es una proliferación de tejido de granulación exuberan- inflammation or local irritation. It is a rare lesion in newborn; it te, a una infl amación crónica o una irritación local, poco frecuente appears as an isolated tumor lesion, mostly located in the anterior del recién nacido, que se presenta como una lesión tumoral única, zone of the alveolar crest. This lesion bleeds spontaneously and localizada con mayor frecuencia en la zona anterior de la cresta shows predilection for the female gender. Its etiology is related to alveolar, de sangrado espontáneo, tiene predilección por el género trauma factors, local irritation and hormonal changes. Due to its size femenino, la etiología se relaciona con factores traumáticos, irrita- it can affect the newborn’s feeding. Surgical removal is the choice ción local y cambios hormonales, por el tamaño puede afectar la treatment for this type of lesions. The present study presents the alimentación del neonato, la remoción quirúrgica es el tratamiento case of a newborn with diagnosis of telangiectaticum granuloma de elección. Se presenta caso clínico de recién nacido con diagnós- in the mandibular ridge associated to a natal tooth. -
The Development of the Permanent Teeth(
ro o 1Ppr4( SVsT' r&cr( -too c The Development of the Permanent Teeth( CARMEN M. NOLLA, B.S., D.D.S., M.S.* T. is important to every dentist treat- in the mouth of different children, the I ing children to have a good under - majority of the children exhibit some standing of the development of the den- pattern in the sequence of eruption tition. In order to widen one's think- (Klein and Cody) 9 (Lo and Moyers). 1-3 ing about the impingement of develop- However, a consideration of eruption ment on dental problems and perhaps alone makes one cognizant of only one improve one's clinical judgment, a com- phase of the development of the denti- prehensive study of the development of tion. A measure of calcification (matura- the teeth should be most helpful. tion) at different age-levels will provide In the study of child growth and de- a more precise index for determining velopment, it has been pointed out by dental age and will contribute to the various investigators that the develop- concept of the organism as a whole. ment of the dentition has a close cor- In 1939, Pinney2' completed a study relation to some other measures of of the development of the mandibular growth. In the Laboratory School of the teeth, in which he utilized a technic for University of Michigan, the nature of a serial study of radiographs of the same growth and development has been in- individual. It became apparent that a vestigated by serial examination of the similar study should be conducted in same children at yearly intervals, utiliz- order to obtain information about all of ing a set of objective measurements the teeth. -
Morphological Integration in the Hominin Dentition: Evolutionary, Developmental, and Functional Factors
ORIGINAL ARTICLE doi:10.1111/j.1558-5646.2011.01508.x MORPHOLOGICAL INTEGRATION IN THE HOMININ DENTITION: EVOLUTIONARY, DEVELOPMENTAL, AND FUNCTIONAL FACTORS Aida Gomez-Robles´ 1,2 and P. David Polly3 1Konrad Lorenz Institute for Evolution and Cognition Research, Adolf Lorenz Gasse 2, A-3422 Altenberg, Austria 2E-mails: [email protected]; [email protected] 3Department of Geological Sciences, Indiana University, 1001 East 10th Street, Bloomington, Indiana 47405 Received June 29, 2011 Accepted October 19, 2011 As the most common and best preserved remains in the fossil record, teeth are central to our understanding of evolution. However, many evolutionary analyses based on dental traits overlook the constraints that limit dental evolution. These constraints are di- verse, ranging from developmental interactions between the individual elements of a homologous series (the whole dentition) to functional constraints related to occlusion. This study evaluates morphological integration in the hominin dentition and its effect on dental evolution in an extensive sample of Plio- and Pleistocene hominin teeth using geometric morphometrics and phyloge- netic comparative methods. Results reveal that premolars and molars display significant levels of covariation; that integration is stronger in the mandibular dentition than in the maxillary dentition; and that antagonist teeth, especially first molars, are strongly integrated. Results also show an association of morphological integration and evolution. Stasis is observed in elements with strong functional and/or developmental interactions, namely in first molars. Alternatively, directional evolution (and weaker integration) occurs in the elements with marginal roles in occlusion and mastication, probably in response to other direct or indirect selective pressures. -
Common Pediatric Dental Problems
PEDIATRIC SURGERY FOR THE PRZMARY CARE PEDIATRICIAN, PART II 0031-3955/98 $8,00 + .OO COMMON PEDIATRIC DENTAL PROBLEMS Paul R. Creighton, DDS Pediatric dentistry is one of the eight specialties recognized by the American Dental Association. In the early 1900s, children were treated as ”little adults” and the focus of routine dentistry was to treat the effects of dental decay, such as pulpitis, and resultant pain from this condition. Initially, dental decay resulted in extraction and restorative treatment with emphasis on space maintenance and arch integrity. Since the early 1900s, tremendous improvements have taken place in restorative and preventative techniques. Today, pediatric dentistry is prevention oriented. The cornerstone of prevention-based pediatric dentistry is early referral to the dentist and routine follow-up visits. For many years, the American Academy of Pediatrics has recommended that children make their first dental visit after their third birthday. The Academy of Pediatric Dentistry, on the other hand, has recommended that children be seen by the age of 1 year. The goal of a pediatric dental practice is to emphasize the importance of oral health to the child and the child’s parents. Behavior management is still very much the backbone of the specialty. A primary goal of the treatment-oriented pediatric dental profession is behavior management. A prevention-oriented pediatric dental profession concentrates on educating the parents of very young children on the dental milestones seen in the pediatric population, proper diet, and other issues that prevent dental disease. Given the etiology, pathogenesis, and the treatment of dental diseases, prevention is the only true cure, although realistically, restorative treatment will always be a significant component to the specialty. -
A Global Compendium of Oral Health
A Global Compendium of Oral Health A Global Compendium of Oral Health: Tooth Eruption and Hard Dental Tissue Anomalies Edited by Morenike Oluwatoyin Folayan A Global Compendium of Oral Health: Tooth Eruption and Hard Dental Tissue Anomalies Edited by Morenike Oluwatoyin Folayan This book first published 2019 Cambridge Scholars Publishing Lady Stephenson Library, Newcastle upon Tyne, NE6 2PA, UK British Library Cataloguing in Publication Data A catalogue record for this book is available from the British Library Copyright © 2019 by Morenike Oluwatoyin Folayan and contributors All rights for this book reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior permission of the copyright owner. ISBN (10): 1-5275-3691-2 ISBN (13): 978-1-5275-3691-3 TABLE OF CONTENTS Foreword .................................................................................................. viii Introduction ................................................................................................. 1 Dental Development: Anthropological Perspectives ................................. 31 Temitope A. Esan and Lynne A. Schepartz Belarus ....................................................................................................... 48 Natallia Shakavets, Alexander Yatzuk, Klavdia Gorbacheva and Nadezhda Chernyavskaya Bangladesh ...............................................................................................