DOCSLIB.ORG

Hominoid Arcade Shape: Pattern and Magnitude of Covariation

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Hominoid Arcade Shape: Pattern and Magnitude of Covariation Journal of Human Evolution 107 (2017) 71e85 Contents lists available at ScienceDirect Journal of Human Evolution journal homepage: www.elsevier.com/locate/jhevol Hominoid arcade shape: Pattern and magnitude of covariation * Stefanie Stelzer a, , Philipp Gunz a, Simon Neubauer a, Fred Spoor a, b a Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Leipzig 04103, Germany b Department of Cell and Developmental Biology, University College London, London WC1E 6BT, UK article info abstract Article history: The shape of the dental arcade and canine size distinguish extant humans from all apes. Humans are Received 8 October 2015 characterized by a parabolic arcade with short postcanine tooth rows and small canines, whereas apes Accepted 28 February 2017 have long, U-shaped arcades with large canines. The evolutionary and biomechanical mechanisms un- derlying arcade shape differences between and within groups are not well understood. It is unclear, for example, whether evolutionary changes in the covariation among modules comprising the upper and Keywords: lower jaws are the cause and/or consequence of different arcade shapes. Here we use 3D geometric Maxilla morphometric methods to explore to what extent the morphological differences in arcade shape be- Mandible Premaxilla tween living hominoids are related to differences in covariation of upper and lower jaws, and the pre- Integration maxilla and the maxilla. We show that all extant hominoids follow a very similar covariation pattern Jaw between upper and lower dental arcades, as well as between the premaxilla and the maxilla. We find Canine comparably high magnitudes of covariation between the premaxilla and the maxilla in all groups. Be- tween the upper and lower jaws, levels of covariation are similar in apes (Pan, Gorilla, Pongo, and Hylobates), but overall lower in extant humans. Our results demonstrate an independence of the pattern of arcade shape covariation from dental spatial arrangements. Importantly, we show that a shared hominoid pattern of covariation between premaxilla and maxilla together with the covariation of upper and lower jaw is consistent with major evolutionary arcade shape changes in hominoids. We suggest that with the reduction of canine and diastema size in hominins, the incisors move posteriorly and the tooth row becomes more parabolic. Our study provides a framework for addressing questions about fossil hominin dentognathic diversity, including inter- and intraspecific variation and associations of upper and lower jaw morphology. © 2017 Elsevier Ltd. All rights reserved. 1. Introduction 1942), where canine size can vary strongly inter- and intraspecifi- cally (Almquist, 1974; Leutenegger and Kelly, 1977; Oxnard et al., Dentognathic morphology of extant humans and apes differs 1985; Leutenegger and Shell, 1987; Plavcan and van Schaik, 1992; notably in canine size and arcade shape. In apes, the arcades are U- Plavcan, 1993; Kelley, 1995). shaped with narrow and near-parallel postcanine tooth rows. Modern human dental arcades are usually referred to as being Furthermore, dental arcade shape varies within and between ape parabolic (Angle, 1899; Broomell, 1902; Le Gros Clark, 1950; Genet- species: posteriorly diverging or converging postcanine tooth rows Varcin, 1969), elliptic (Black, 1902; Garn, 1968; Currier, 1969; result in a range of arcade contours (Hellman, 1919). In some in- Brader, 1972) or catenary (MacConaill and Scher, 1949; Scott, dividuals the arcade tapers in the premolar region to diverge again 1957; Engel, 1979), with upper and lower arcades having slightly more posteriorly, giving it a saddle shape (Hellman, 1919; Remane, different shapes (Hellman, 1919; Engel, 1979). Incisors and canines 1921). The large lower canines are accommodated in a diastema are of almost equal size (Schwartz, 1995) and their occlusal surfaces between the upper lateral incisor and the enlarged upper canine; in are on the same level as the postcanine dentition. the mandible, the upper canine is accommodated between the Intra- and interspecific differences in cranial and mandibular lower canine and the lower premolars (Angle, 1899; Hellman, architecture among primates have been related to differences in masticatory behavior, including varying mechanical stress (Hrdlicka, 1940; Hylander, 1972, 1979; Carlson and Vangerven, 1977; Weijs and Hillen, 1984; Bouvier, 1986; Weijs and Hillen, * Corresponding author. E-mail address: [email protected] (S. Stelzer). 1986; Armelagos et al., 1989; Ravosa, 1990; Corruccini, 1991; http://dx.doi.org/10.1016/j.jhevol.2017.02.010 0047-2484/© 2017 Elsevier Ltd. All rights reserved. 72 S. Stelzer et al. / Journal of Human Evolution 107 (2017) 71e85 Herring, 1993; Anapol and Lee, 1994; Larsen, 1995; Cassidy et al., Lieberman et al., 2000; Marroig and Cheverud, 2001; Ackermann, 1998; Sardi et al., 2004; Lieberman, 2008; von Cramon-Taubadel, 2002; Gonzalez-Jose et al., 2004; Marroig et al., 2004; Acker- 2011; Prasad et al., 2013). These biomechanical arguments mann, 2005; Goswami, 2006; Gunz and Harvati, 2007; Mitter- emphasize that relative position and length of the dental arcade oecker and Bookstein, 2008; Porto et al., 2009; Makedonska et al., influence the stress distribution (Witzel and Preuschoft, 2002). In 2012; Villmoare et al., 2014). In this study we assess (1) whether the this view, phenotypic variation of the upper and lower jaw is seen same applies to hominoid upper and lower dental arcades, or (2) as a consequence rather than a precondition for different force whether the variation in extant arcade shapes is associated with a distributions. In apes relatively long tooth rows and prognathic variation of the underlying patterns of covariation. dental arcades seem to be biomechanically advantageous, whereas The magnitude of covariation has been related to material in humans the parabolic arcade is seen as a side effect of reduction properties of food, in that taxa relying on a mechanically chal- in bite- and chewing forces and the reorganization of the face lenging diet have stronger integrated upper and lower jaws (Preuschoft, 1989; Witzel and Preuschoft, 1999) with little biome- (Marroig and Cheverud, 2001; Makedonska et al., 2012). Pan, Pongo, chanical significance (Preuschoft and Witzel, 2004). Recent studies Gorilla, and Hylobates consume different proportions of leaves, fruit, in capuchin monkeys (Makedonska et al., 2012) and modern other plant parts, or insects, and their dietary preferences are humans (Noback and Harvati, 2015) showed that, at least within dependent on season, food availability, habitat and sex. In general, groups, dental arcade shape (in contrast to size and position) is however, Pan, Pongo, and Hylobates are more frugivorous, whereas largely independent from masticatory forces. These authors found Gorilla is more reliant on leaves (MacKinnon, 1974; Rijksen, 1978; correlations between diet and shape of the temporalis muscle and Gittins and Raemaekers, 1980; Watts, 1984; Galdikas, 1988; Tutin the cranium, but none between subsistence and maxillary arch and Fernandez, 1993; Knott, 1998; McConkey et al., 2003; Rogers shape. et al., 2004; Boesch et al., 2006; Doran-Sheehy et al., 2009). The evolutionary and biomechanical mechanisms underlying Morphologically, this difference is reflected in relative dental sizes. the differences in arcade shape between extant humans and apes, Frugivores have relatively larger incisors, while foliovores have as well as those underlying the within-group variability, are not relatively larger molars (Hylander, 1975; Kay and Hylander, 1978). well understood. The evolutionary trajectory of our lineage is In comparison to apes, modern humans have a more generalist diet, interesting in this regard, as arcade shape varies considerably where extra-oral food processing via tool use or cooking is thought among fossil hominins (e.g., Weidenreich, 1936; Tobias, 1967; to have reduced the masticatory effort since the emergence of our Johanson et al., 1978; Johanson and White, 1979; Greenfield, species or even earlier (e.g. Brace et al., 1987; Wrangham et al., 1992). Besides a general reduction in absolute canine size, early 1999; Richards et al., 2001; Teaford et al., 2002; Henry, 2010). hominins like Australopithecus anamensis and Australopithecus While a correlation with diet seems likely, some authors have afarensis possess primitive features such as a small diastema be- suggested that the lower covariation magnitudes in the human tween the upper incisor and the canine, as well as parallel to cranium (Marroig et al., 2009; Porto et al., 2009) and pelvis slightly diverging tooth rows (Schwartz, 1995; White et al., 2000; (Grabowski et al., 2011) may indicate a general relaxation of inte- Ward et al., 2001; Kimbel and Delezene, 2009). Some early Homo gration in the hominin lineage. These authors argued that the specimens retain long and almost parallel tooth rows, whereas change in magnitude of integration might have paved the way for others have shorter postcanine rows and non-projecting frontal the development of the morphological changes characterizing our tooth rows (Tobias, 1991; Wood, 1991; Rightmire, 1993; Kimbel lineage. In addition to the two aforementioned aims, we therefore et al., 1997; Clarke, 2012; Leakey et al., 2012; Spoor et al., 2015). also assess (3) whether there are differences in the magnitude of Large-scale differences in jaw shapes have been used to support covariation between the groups, and (4) whether there are differ- arguments
Load more

Recommended publications
  • The Definition of New Dental Morphological Variants Related to Malocclusion
    10 Technical Note: The Definition of New Dental Morphological Variants Related to Malocclusion Marin A. Pilloud1,* 1 Department of Anthropology, University of Nevada, Reno, NV 89557 Keywords: dental crowding, midline diastema, canine diastema, overbite, underbite, overjet ABSTRACT Since the codification of the Arizona State University Dental Anthropology System over 25 years ago, few additional morphological traits have been defined. This work serves to expand the cur- rent suite of traits currently collected by biological anthropologists. These traits surround various issues of malocclusion and follow clinical definitions of these traits as well as incorporate observed population variation in character states. These traits include issues of spacing (i.e., diastema and crowding) as well as mandibular and maxillary occlusion (i.e., overbite, underbite). A discussion of the etiology and utili- ty of these traits in bioarchaeological and forensic anthropological research is also given. The Arizona State University Dental Anthropology Diastema System (ASUDAS) has been the standard in defin- While the midline diastema has been defined in the ing morphological variants of the teeth for over 25 new volumes by Scott and Irish (2017) and Edgar years (Turner et al., 1991). This publication outlines (2017), their definitions differ as to what exactly 36 traits of the dentition as well as rocker jaw, and constitutes a diastema, they do not offer grades of mandibular and palatine tori. This original work is expression, nor do they incorporate a canine dia- based on a rich literature defining morphological stema. The definition presented here is based on variation of the teeth (e.g., Dahlberg ,1956; Haniha- the definitions provided in these two works as well ra ,1961; Harris and Bailit, 1980; Hrdlička ,1921; as several other preceding studies.
    [Show full text]
  • Unraveling the Molecular Mechanisms That Lead to Supernumerary Teeth in Mice and Men: Current Concepts and Novel Approaches
    Cells Tissues Organs 2007;186:60–69 DOI: 10.1159/000102681 Unraveling the Molecular Mechanisms That Lead to Supernumerary Teeth in Mice and Men: Current Concepts and Novel Approaches a b Rena N. D’Souza Ophir D. Klein a Department of Biomedical Sciences, Baylor College of Dentistry, Texas A&M University Health Science Center, b Dallas, Tex. , and Department of Pediatrics, University of California, San Francisco, Calif. , USA Key Words basic mechanisms involved is essential. The purpose of this Fibroblast growth factors Runx2 Sprouty manuscript is to review current knowledge about how su- Supernumerary teeth Transgenic mice pernumerary teeth form, the molecular insights gained through studies on mice that are deficient in certain tooth signaling molecules and the questions that require further Abstract research in the field. Copyright © 2007 S. Karger AG, Basel Supernumerary teeth are defined as those that are present in excess of the normal complement of human dentition and represent a unique developmental anomaly of patterning and morphogenesis. Despite the wealth of information gen- erated from studies on normal tooth development, the ge- netic etiology and molecular mechanisms that lead to con- genital deviations in tooth number are poorly understood. Abbreviations used in this paper For developmental biologists, the phenomenon of supernu- merary teeth raises interesting questions about the devel- BMP bone morphogenic protein opment and fate of the dental lamina. For cell and molecular CCD cleidocranial dysplasia biologists, the anomaly of supernumerary teeth inspires sev- Eda ectodysplasin gene eral questions about the actions and interactions of tran- FGF3–10 fibroblast growth factors 3–10 scription factors and growth factors that coordinate mor- FGFR1, 2 fibroblast growth factor receptors 1, 2 M1 first molar phogenesis, cell survival and programmed cell death.
    [Show full text]
  • Managing the Developing Occlusion
    Managing the Developing Occlusion A guide for dental practitioners INTRODUCTION Whether knowingly or not, every dentist ORTHODONTIC ADVICE who treats children practices orthodontics. First, when considering potential orthodontic It is not enough to think of orthodontics advice for the patient, the dental practitioner should consider the following general questions: as being solely concerned with appliances. 1. Is the patient’s basic dental health under Orthodontics is the longitudinal care of control and is the parent available for the developing occlusion and any consultation? problems associated with it. All qualified 2. Is the orthodontic condition minor, moderate dental practitioners should be encouraged or severe in nature and does it cause the patient to consider the orthodontic requirements concern? of their patients. 3. Can the practitioner provide adequate advice in the short, medium and long term, or is specialist advice required and, if so, at what level? This booklet is designed to help general dental practitioners examine children 4. Would the patient and parent prefer a specialist opinion? from an orthodontic viewpoint. It will highlight the assessment of patients at TREATMENT different stages of dental development Secondly, when considering potential orthodontic and will outline the interceptive treatment for patients, the dental practitioner should consider the following general questions: procedures and treatments available to deal with the conditions most commonly 1. Does the patient want the condition changed? encountered. 2. Is the patient receptive to the idea of, and available for, orthodontic treatment? Before specific assessment and 3. Is specialist treatment required and, if so, at treatments are considered, a general what level? view of the developing dentition and face is advisable.
    [Show full text]
  • Marsupials and Rodents of the Admiralty Islands, Papua New Guinea Front Cover: a Recently Killed Specimen of an Adult Female Melomys Matambuai from Manus Island
    Occasional Papers Museum of Texas Tech University Number xxx352 2 dayNovember month 20172014 TITLE TIMES NEW ROMAN BOLD 18 PT. MARSUPIALS AND RODENTS OF THE ADMIRALTY ISLANDS, PAPUA NEW GUINEA Front cover: A recently killed specimen of an adult female Melomys matambuai from Manus Island. Photograph courtesy of Ann Williams. MARSUPIALS AND RODENTS OF THE ADMIRALTY ISLANDS, PAPUA NEW GUINEA RONALD H. PINE, ANDREW L. MACK, AND ROBERT M. TIMM ABSTRACT We provide the first account of all non-volant, non-marine mammals recorded, whether reliably, questionably, or erroneously, from the Admiralty Islands, Papua New Guinea. Species recorded with certainty, or near certainty, are the bandicoot Echymipera cf. kalubu, the wide- spread cuscus Phalanger orientalis, the endemic (?) cuscus Spilocuscus kraemeri, the endemic rat Melomys matambuai, a recently described species of endemic rat Rattus detentus, and the commensal rats Rattus exulans and Rattus rattus. Species erroneously reported from the islands or whose presence has yet to be confirmed are the rats Melomys bougainville, Rattus mordax, Rattus praetor, and Uromys neobrittanicus. Included additional specimens to those previously reported in the literature are of Spilocuscus kraemeri and two new specimens of Melomys mat- ambuai, previously known only from the holotype and a paratype, and new specimens of Rattus exulans. The identity of a specimen previously thought to be of Spilocuscus kraemeri and said to have been taken on Bali, an island off the coast of West New Britain, does appear to be of that species, although this taxon is generally thought of as occurring only in the Admiralties and vicinity. Summaries from the literature and new information are provided on the morphology, variation, ecology, and zoogeography of the species treated.
    [Show full text]
  • Small Mammal Dentistry
    Dental Checkup Small Mammal Dentistry Kathy Istace, CVT, VTS (Dentistry) any veterinary technicians are unfamiliar with the oral Ferrets conditions of small mammals and the treatment options. The dental formula for ferrets is 2(I3/3, C1/1, P3/3, M1/2) = 34.6 MBy the time their owners notice a problem, these small Ferret teeth closely resemble feline teeth in form and function, patients may already be debilitated. Technicians and pet owners but ferrets have an additional mandibular premolar and molar. need to be knowledgeable about the particular needs of small mammals in order for these animals to have healthy mouths. Hedgehogs The dental formula for hedgehogs is 2(I2–3/2, C1/1, P3–4/2–3, Oral Anatomy M3/3) = 34 to 40.7 Rabbits Hedgehogs are insectivores with a long, narrow snout and a The dental formula for rabbits is 2(I2/1, C0/0, P3/2, M3/3) = 28.1 primitive tooth structure. The incisors are used to grasp prey, and Rabbit teeth grow continuously and have no true anatomic roots.2 the canine teeth may resemble incisors or first premolars. All Rabbits have two incisors in each upper quadrant: a rostral and a teeth have true anatomic roots and do not grow continuously.8 caudal tooth (the caudal teeth are often calledpeg teeth). The lower incisors occlude between the upper posterior incisors and the peg Sugar Gliders teeth in a scissor-like fashion to bite off grasses and hay. Rabbits do The dental formula for sugar gliders is 2(I3/2, C1/0, P3/3, M4/4) not have canine teeth; between the incisors and premolars is a long = 40.9 Sugar gliders are small marsupials with teeth designed for gap called a diastema, which is occupied by cheek tissue when the stripping bark from trees.
    [Show full text]
  • Subfossil Lemurs of Madagascar
    CHAPTER TWENTY-ONE Subfossil Lemurs of Madagascar LAURIE R. GODFREY, WILLIAM L. JUNGERS, AND DAVID A. BURNEY Madagascar’s living lemurs (order Primates) belong to a radia- on steady, gradual diversifi cation would suggest. We believe tion recently ravaged by extirpation and extinction. There that the latter scenario is more consistent with the fossil are three extinct and fi ve extant families (two with extinct record. members) of lemurs on an island of less than 600,000 km2. The question of how lemurs got to Madagascar is still far This level of familial diversity characterizes no other primate from resolved (Godinot, 2006; Masters et al., 2006; Stevens radiation. The remains of up to 17 species of recently extinct and Heesy, 2006; Tattersall, 2006a, 2006b). It is clear that (or subfossil lemurs) have been found alongside those of still Madagascar (with the Indian plate) separated from Africa extant lemurs at numerous Holocene and late Pleistocene long before primates evolved and that it arrived at its present sites in Madagascar (fi gure 21.1, table 21.1). The closest rela- position relative to Africa by 120–130 Ma (Krause et al., 1997; tives of the lemurs are the lorisiform primates of continental Roos et al., 2004; Masters et al., 2006; Rabinowitz and Woods, Africa and Asia; together with the lemurs, these comprise the 2006). Most scholars favor chance rafting of an ancestral suborder Strepsirrhini. lemur from continental Africa to Madagascar (Krause et al., Most researchers have defended an ancient Gondwanan 1997; Kappeler, 2000; Roos et al., 2004; Rabinowitz and (African or Indo-Madagascan) origin for lemurs.
    [Show full text]
  • The Influence of Etiological Factors in the Occurence of Diastema Mediana
    ПРИЛОЗИ, Одд. мед. науки, XXXV 2, 2014 МАНУ CONTRIBUTIONS. Sec. Med. Sci., XXXV 2, 2014 MASA DOI: 10.2478/prilozi-2014-0022 ISSN 18579345 UDC: 616.314.21007-02 THE INFLUENCE OF ETIOLOGICAL FACTORS IN THE OCCURENCE OF DIASTEMA MEDIANA Biljana Kapusevska, Nikola Dereban, Efka ZabokovaBilbilova, Mirjana Popovska Faculty of Dentistry, St. Panteleimon P.H.O. Dental Clinical Centre, Department of Prosthodontics, Ss. Cyril and Methodius University, Skopje, R. Macedonia Corresponding Author: Biljana Kapusevska, MD, PhD, Faculty of Dentistry, University St. Cyril and Methodius, Majka Tereza PO BOX 17, Skopje 1000, R. Macedonia Tel: ++ 389 (02) 3 11 56 47 Fax: ++ 389 (02) 3 11 56 47 Url: http://www.stomfak.ukim.edu.mk/; E-mail: [email protected] Abstract Even from the distant past the aesthetic perception in an individual was diminished by the presence of gap between the central incisors. This condition is found under the term "dents du bonheur" or "lucky teeth" and is encountered even among world famous figures including Brigitte Bardot, Eliah Wood, Madonna, Zac Efron, Amy Winehouse and Elton John. The teeth gaps are still considered main reasons for dissatisfaction of the dental patients and reasons for the requirement of aesthetic treatment. The purpose of this study is to exhibit the influence of the etiological factors in the occurrence of dia- stema mediana classified according to the dominance of their occurrence expressed in percentage values. Materials of this investigation were 100 patients with diastema mediana from the following factors: inheritance, disproportion in the dental arches, inborn or acquired missing teeth, harmful oral habits, high insertion of the labial frenulum as well as mesiodens.
    [Show full text]
  • The Interrelationship of the Premaxilla and the Mandibular Symphysis in Morphometric Terms and on a Wide Comparative Sample of Anthropoid Primates
    THE INTERRELATIONSHIP OF THE PREMAXILLA AND THE MANDIBULAR SYMPHYSIS IN ANTHROPOID PRIMATES Georgia Mortzou November 2003 Dissertation submitted to University College London in partial fulfilment of the requirements for the degree of Doctor of Philosophy ProQuest Number: 10011152 All rights reserved INFORMATION TO ALL USERS The quality of this reproduction is dependent upon the quality of the copy submitted. In the unlikely event that the author did not send a complete manuscript and there are missing pages, these will be noted. Also, if material had to be removed, a note will indicate the deletion. uest. ProQuest 10011152 Published by ProQuest LLC(2016). Copyright of the Dissertation is held by the Author. All rights reserved. This work is protected against unauthorized copying under Title 17, United States Code. Microform Edition © ProQuest LLC. ProQuest LLC 789 East Eisenhower Parkway P.O. Box 1346 Ann Arbor, Ml 48106-1346 ABSTRACT The premaxilla and mandibular symphysis have been traditionally studied in isolation, despite their anatomical vicinity and functionally complementary roles. The latter are particularly seen in the accommodation of incisors and the dissipation of masticatory forces. The diversity in the morphology of both premaxilla and mandibular symphysis has been viewed in the past as phylogenetically informative, but recent research has highlighted such a large degree of inherent variability, that its diagnostic validity is being seriously challenged. 50 inter-landmark distances, reflecting the upper and lower anterior masticatory complex, were collected from 26 species of extant anthropoid primates. Morphological correlations in the upper and lower masticatory complex were investigated using Principal Components Analysis. Discriminant Function Analysis (DFA) was employed to determine the extent to which the morphology of this region reflects diet.
    [Show full text]
  • Reported a Treat an MMD in a Patient with Discolored Dentition
    CLINICAL PRACTICE CASE REPORT Treating a maxillary midline diastema in adult patients A general dentist’s perspective C.H. Chu, PhD, MAGD, ABGD; C.F. Zhang, DDS, MDS, PhD; L.J. Jin, DDS, MDS, PhD he presence of a space between the two maxillary central inci- sors—a maxillary midline ABSTRACT Tdiastema (MMD)—is considered a Background. A maxillary midline diastema (MMD) often normal developmental phenomenon in is a primary concern of patients during a dental consulta- children and requires no treatment. 1 tion. Although an MMD can be transient owing to the devel- Lindsey conducted a study, the results of oping dentition and, thus, requires no active treatment, which showed that about two-thirds of management of MMDs in the permanent dentition requires children in whom only central incisors a detailed examination and appropriate care. had erupted exhibited an MMD. An Case Descriptions. The authors present five cases of MMD of greater than 2 millimeters in MMDs in adults to illustrate a range of restorative and the mixed dentition is unlikely to close orthodontic options. In the first case, the clinician used spontaneously2 and may persist in the resin-based composite buildup to close an MMD resulting permanent dentition. An MMD can be inherited and is more prevalent in cer- from small teeth and generalized spacing in the dental arch. tain ethnic groups.2 Gass and colleagues3 In the second case, the clinician placed porcelain veneers to reviewed the literature and reported a treat an MMD in a patient with discolored dentition. In the prevalence of MMD that ranged from 1.6 third case, the clinician fitted a removable appliance to close to 25.4 percent of adults from various an MMD by tipping the incisors palatally.
    [Show full text]
  • Molar Protraction Through Downward Extension of Maxillary Sinus in Patient with Central Diastema Caused by Small Lateral Incisors
    Volume 32 Issue 1 Article 4 2020 Molar Protraction Through Downward Extension of Maxillary Sinus in Patient with Central Diastema Caused by Small Lateral Incisors Hsien-Fang Hung Dr. Su's Teamwork Orthodontic Center, Taipei, Taiwan Ming-Chu Huang Dr. Su’s Teamwork Orthodontic Center, Taipei, Taiwan Ming-Jeaun Su Dr. Su’s Teamwork Orthodontic Center, Taipei, Taiwan, [email protected] Follow this and additional works at: https://www.tjo.org.tw/tjo Part of the Orthodontics and Orthodontology Commons Recommended Citation Hung, Hsien-Fang; Huang, Ming-Chu; and Su, Ming-Jeaun (2020) "Molar Protraction Through Downward Extension of Maxillary Sinus in Patient with Central Diastema Caused by Small Lateral Incisors," Taiwanese Journal of Orthodontics: Vol. 32 : Iss. 1 , Article 4. DOI: 10.30036/TJO.202003_32(1).0004 Available at: https://www.tjo.org.tw/tjo/vol32/iss1/4 This Case Report is brought to you for free and open access by Taiwanese Journal of Orthodontics. It has been accepted for inclusion in Taiwanese Journal of Orthodontics by an authorized editor of Taiwanese Journal of Orthodontics. Case Report Closure of Diastema and Molar Extraction Space MOLAR PROTRACTION THROUGH DOWNWARD EXTENSION OF MAXILLARY SINUS IN PATIENT WITH CENTRAL DIASTemA CAUSed BY SMALL LATERAL INCISORS Hsien-Fang Hung, Ming-Chu Huang, Ming-Jeaun Su Dr. Su’s Teamwork Orthodontic Center, Taipei, Taiwan A 32-year-old male patient presented with upper central diastema resulting from upper bilateral small- sized lateral incisors. The patient also had a deep bite of dental origin. A relatively simple mechanotherapy with pre-adjusted edgewise appliances was applied.
    [Show full text]
  • Skulls of Alaskan Mammals
    Skulls of Alaskan Mammals A Teacher’s Guide Alaska Department of Fish and Game Division of Wildlife Conservation © 2005 Skulls of Alaskan Mammals A Teacher’s Guide Original Text: Ruth M. Gronquist Revised Text and Activities: Kristen Romanoff Editors: Robin Dublin, Lilly Goodman, Polly Hessing, Mike Taras & Sue Steinacher Reviewers: Jessie Coltrane, Ruth Gronquist, Polly Hessing, Rebecca Kellyhouse & Boyd Porter Layout: Kristen Romanoff, Andy Romanoff & Sue Steinacher Illustrations: Copyright Richard Carstensen, Kathy Hocker & Sue Steinacher Skull Sheets: Adapted from Hall and Kelson. 1959, Ronald Press Company. This revision of the original 1983, Skulls of Alaska Mammals by Ruth Gronquist, Alaska Department of Fish and Game, is made possible with funding from the State Wildlife Grants program. Alaska Department of Fish and Game Division of Wildlife Conservation © 2005 The Alaska Department of Fish and Game administers all programs and activities free from discrimination based on race, color, national origin, age, sex, religion, marital status, pregnancy, parenthood, or disability. For information on alternative formats for this and other ADF&G publications, please contact the Department of ADA Coordinator at (voice) 907-465-4120, telecommunication device for the deaf (TDD) 1-800-478-3648, or fax 907-465- 6078. Any person who believes she/he has been discriminated against should write to ADF&G, PO Box 25526, Juneau, AK 99802-5526 or OEO, U.S. Department of the Interior, Washington, DC 20240. Skulls of Alaskan Mammals A Teacher’s Guide 1. Introduction 2. About Skulls 3. Activities A. Skull Detective: Teeth, Eyes & More B. Who’s Related to Whom? C. Drawing Skulls D.
    [Show full text]
  • Insidedent Diastema.Pdf
    2 INSIDE DENTISTRY—APRIL 2009 CLINICAL A review from the experts. TREATMENT optioNs Treatment Options for the Significant Dental Midline Diastema Michael R. Sesemann, DDS, FAACD From the beginning of time people stymata are prominently displayed in the his dental midline diastema. A compre- have noticed, and perhaps passed judg- mouths of many famous and successful hensive dental examination revealed excel- Michael R. Sesemann, DDS, FAACD ment on, people with prominent spaces people from all walks of life, including lent overall oral health. The only treatment President-Elect and in their dentitions. In France, the teeth David Letterman, Elton John, Eddie Mur- recommendation, made for the purpose Accredited Fellow on either side of a space or gap are called phy, Madonna, Lauren Hutton, Michael of maintenance, was for the replacement American Academy of “dents du bonheur” or “lucky teeth.” In Strahan,Arnold Schwarzenegger,and Con- of a few older restorations that were show- Cosmetic Dentistry Nigeria, a dentition sporting gaps be- doleezza Rice, to name a few. However, ing signs of marginal deterioration. tween teeth is considered an exception- there remain a significant number of peo- When asked to smile, the patient’s lip Private Practice ally attractive physical trait. In early English ple who do wish to eliminate a diastema retraction capability was moderately dy- Omaha, Nebraska societies, the presence of a gapped-tooth if it is part of their dentition. namic, yet high enough to yield a clear presentation in a female smile was equat- Because of the varying perceptions, a view of a midline diastema measuring ed with lustful connotations.
    [Show full text]