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anomaly of the periodontal ligament

Carlos Roberto Colombo Robazza, Julio Cesar Alves e Motta, Marina Lara de Carli, Fernanda Rafaelly de Oliveira Pedreira, Joao Adolfo Costa Hanemann
AIM: This work describes the retreatment of an unusual case of dens invaginatus with gutta-percha overfilling at the gingival mucosa and chronic apical periodontitis in a 34-year-old woman. Initial periapical radiograph showed the presence of type II dens invaginatus with poor quality obturation, root perforation and chronic apical periodontitis of tooth 22. BACKGROUND: Dens invaginatus is a tooth malformation caused by infolding of the dental papilla during tooth development...
May 2013: Journal of Contemporary Dental Practice
Georg Meyer, Jochen Fanghänel, Peter Proff
Although oral implantology is among the most beneficial developments of modern dentistry, the widely spread opinion that the long-term outcome of implants is superior to that of natural teeth has been refuted. To evade uncritical extractions, the morphofunctional properties of natural teeth and implant-supported restorations are compared from a proprioceptive and occlusal trauma perspective. The periodontal ligament of natural teeth provides the central nerve system with feedback for sensory perception and motor control...
March 20, 2012: Annals of Anatomy, Anatomischer Anzeiger: Official Organ of the Anatomische Gesellschaft
Carolina Loch, Liliane J Grando, Jules A Kieser, Paulo C Simões-Lopes
Pathological processes observed in the stomatognathic systems of mammalian species are a useful source of information about the habits, evolution and general health of such animals. Studies of pathological conditions on teeth are common in humans and other primates, but rare in wild animals in general and marine mammals in particular. For cetaceans, previous studies provided scanty records of dental anomalies in a few species. This is the first broad and systematic inventory of dental pathology in dolphins...
May 9, 2011: Diseases of Aquatic Organisms
Katrien Van Parys, Irene H A Aartman, Reinder Kuitert, Andrej Zentner
The aim of this study was to examine the potential relationship between the occurrence of orthodontic root resorption and presence of dental anomalies such as tooth agenesis and pipette-shaped roots. Dental anomalies and root resorption were assessed on dental panoramic tomographs (DPT) of 88 subjects, 27 males and 61 females, mean age 28.4 (SD = 11.3 years), selected from orthodontic patients on the basis of the following exclusion criteria: previous fixed appliance treatment, bad quality of the DPTs and no visibility of the periodontal ligament of every tooth, and younger than 15 years of age at the onset of treatment with fixed edgewise appliance lasting at least 18 months...
October 2012: European Journal of Orthodontics
Stefan Lossdörfer, Bassel Abou Jamra, Birgit Rath-Deschner, Werner Götz, Rami Abou Jamra, Bert Braumann, Andreas Jäger
OBJECTIVE: The clinical appearance of patients with cleidocranial dysplasia (CCD), which is caused by mutations in the RUNX2 gene, is characterized by anomalies of the clavicles, thorax, spine, pelvis and extremities and by disturbances of the skull and tooth development. Of orthodontic relevance are multiple supernumerary teeth associated with delayed tooth eruption. The present investigation is based on the hypothesis that an altered phenotypic expression of periodontal ligament (PDL) cells from CCD patients and a reduced ability of those cells to support the differentiation of bone-resorbing osteoclasts might contribute to delayed tooth eruption...
November 2009: Journal of Orofacial Orthopedics, Fortschritte der Kieferorthopädie
Enkhtuvshin Gereltzul, Yoshiyuki Baba, Naoto Suda, Momotoshi Shiga, Maristela Sayuri Inoue, Michiko Tsuji, Insik Shin, Yukio Hirata, Kimie Ohyama, Keiji Moriyama
This is a report of a 27-year-old woman with an unusual de novo chromosomal abnormality. Mosaicism was identified in peripheral blood cells examined by standard G-bands by trypsin using Giemsa (GTG) analysis and fluorescence in situ hybridization (FISH) analysis with chromosome-18 region-specific probes, 46,XX,del(18)(pter --> q21.33:)[41], 46,XX,r(18)(::p11.21 --> q21.33::)[8], and 46,XX,der(18)(pter --> q21.33::p11.21 --> pter)[1]. On the other hand, the karyotype of periodontal ligament fibroblasts was nonmosaic, 46,XX, der(18)(pter --> q21...
2008: Journal of Human Genetics
G Pizzo, M E Licata, R Guiglia, G Giuliana
The aim of this paper was to provide a systematic review of the literature on the root resorption caused by orthodontic treatment. Original papers on this subject, published in English from January 2000 until December 2005, were located in the MEDLINE/PubMed database. Other sources were taken from the references of the selected papers. Root resorption is the most common sequela of the orthodontic treatment. It is an inflammatory process that leads to an ischemic necrosis localized in the periodontal ligament when the orthodontic force is applied...
January 2007: Minerva Stomatologica
Tom G Gound, David Maixner
Type III dens invaginatus is a developmental anomaly characterized by an enamel-lined channel that originates on the coronal surface and passes apically through part or all of the root and exits into the periodontal ligament. In this case report, a 13-yr-old male had a Type III dens that exited at the midroot level of tooth #7. At that same level, the root dilacerated severely to the mesial, and a periradicular radiolucency was present on the distal. A 12-mm periodontal defect was present on tooth #6 and a sinus tract was present...
June 2004: Journal of Endodontics
A N Elovikova, M Iu Niashin, E Iu Simanovskaia, L M Gvozdeva, Iu I Niashin
The results of biomechanical investigations of the central incisor having the formed root by mathematical modeling methods are presented. The centre of resistance of a tooth, the optimal horizontal forces of action and reaction were determined. The advantage of discontinuous forces due to amortization influence of periodontal ligament fluid was biomechanically proven. The recommendations which were given after experiments and mathematical modelling were used during orthodontic treatment of 30 patients (12-18 years) with anomalies of dental arches and occlusions by mechanically acting appliances and combined ones...
2002: Stomatologii︠a︡
M R Sims
Orthodontics continues to be a profession anchored in traditional technology using appliances that cause inflammatory periodontal ligament (PDL) responses. Existing concepts of biological tooth movement based largely on histological tissue observations and the application of physical principles require major reassessment. In the next millennium, the genome revolution and knowledge of protein production and control could lead to the genetic correction of dentofacial anomalies and pain-free, biomolecular methods of malocclusion correction and long-term stability...
November 1999: Australian Orthodontic Journal
A C O'Connell, J M Puck, B Grimbacher, F Facchetti, A Majorana, J I Gallin, H L Malech, S M Holland
OBJECTIVE: To determine the incidence of abnormal tooth eruption in patients with hyperimmunoglobulinemia E (hyper-IgE) syndrome. STUDY DESIGN: This study evaluated 34 individuals with hyper-IgE syndrome (age range, 2-40 years). A comprehensive dental history and a head and neck evaluation were performed on all patients. Dental age was assessed in patients younger than 17 years by 2 methods: (1) clinical assessment of tooth eruption and (2) a radiographic method...
February 2000: Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontics
T G Gound
Dens invaginatus is the most common dental anomaly in a group of dental anomalies, related by their embryologic development and by the fact that their defects provide a potential pathway for bacteria to cause pulpal pathology. It occurs when the inner enamel epithelium invaginates into the dental papilla prior to calcification. It exists in erupted teeth as an enamel-lined tract, which either ends in a blind sac inside the crown or root or exits into the periodontal ligament. The lining may be incomplete in areas and may not protect the pulp...
June 1997: Practical Periodontics and Aesthetic Dentistry: PPAD
J R Jasmin, S Clergeau-Guerithault
Neonatal teeth, two mandibulars incisors and one maxillary central incisor, from two separate patients were examined, by SEM. Besides typical enamel anomalies, the incisors exhibited partial or total absence of root formation. These findings suggest that the early eruption of natal and neonatal teeth is dependent on osteoblastic activity within the area of the tooth germ. The reported cases show that teeth may erupt without root formation and without periodontal ligament which correlate with the role of the dental follicle during tooth eruption...
December 1991: Journal de Biologie Buccale
G E Wider, J A Tesk, E Privitzer
Following the initial successes of Goldberg and Gershkoff (Dental Digest, 5, 11, 1947) with the placement of subperiosteal implants, interest in all types of implants emerged. As an aid to the evaluation of various designs and materials without resorting to clinical testing, finite element analyses are being conducted by a number of researchers to determine the stress system induced in bone. The present study investigates the effects of variation in the thicknesses of the periodontal membrane and cortical bone and of the model boundary on the stresses developed around a natural tooth or a tooth-shaped implant...
July 1976: Journal of Biomedical Materials Research
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