periodontal ligament traction theory

The first human teeth to appear, the deciduous (primary) teeth (also known as baby or milk teeth), erupt into the mouth from around 6 months until 2 years of age, in a process known as "teething". 8. These include: 1. Tissues modelled included: cortical bone, cancellous bone, soft tissue dental follicle, periodontal ligament, enamel, dentine, pulp and articular cartilage. Traction by periodontal fibroblasts. 1. Answer: The reason teeth move is due to the properties of the periodontal ligament (which attaches the tooth to the alveolar bone). III. . 0. SHORT ANSWER QUESTIONS: 5X 2 = 10 Marks 1. Methods Plates with periodontal ligament fibroblasts (PDLF) cells were incubated in skimmed and whole milk, recently prepared Hank's balanced salt solution (HBSS), Save-A-Tooth system's . Sawhney RK, Howard J. Molecular dissection of the fibroblast-traction machinery. A. 2. Widening of the periodontal ligament space has a cushioning effect which enables the tooth to bear the excessive occlusal forces. Two hundred one patients had two maxillary and two mandibular teeth extracted, and 29 had only two maxillary premolar teeth extracted . Various theories and opinions have been proposed about the mechanism of tοοth eruption, such as the theory of hydrostatic pressure in vessels and/or tissues [], a theory of the role of the periodontal ligament in the eruption process [], a theory of mobility/contraction of periodontal ligament fibroblasts . In the "pressure-tension theory", the PDL senses a change in mechanical forces or stresses. Rajiv Gandhi University of Health Sciences, Karnataka. They erupt distally to the deciduous second molars. The first permanent teeth that emerge in the oral cavity are the maxillary and mandibular first molars at around six years of age (six-year molars). C. Periodontal ligament traction theory D. Vascular theory. Periodontal Ligament Traction Theory. Branches of mandibular nerve. B. The fibroblasts synthesize collagen and degrade . Theorists hypothesize that the periodontal ligament promotes eruption through the shrinking and cross-linking of their collagen fibers and the contraction of their fibroblasts. When an orthodontic appliance delivers a force of sufficient magnitude to a tooth, the tooth will move, if its root is surrounded by healthy periodontal tissues and alveolar bone. Hypo mineralised structures of enamel 2. . "Periodontal Ligament Traction Theory" of Eruption-tooth is pushed upward by the periodontal ligaments cross-linking and shrinking their collagen fibers and the contraction of their fibroblasts. Strain and hydrostatic stress during incisive and unilateral molar bite force were modelled, with force applied via medial and lateral pterygoid, temporalis, masseter and digastric muscles. For many decades, orthodontic movement and the effects produced by forces on the periodontal ligament and the alveolar process were referred to as areas of pressure and areas of tension in practically all studies, 4,6 except in rare situations. C. Periodontal ligament traction theory D. Vascular theory. •Fluid dynamic theory: Bien Vascular stenosis Aneurysm. When calcospherites fails to fuse during dentin matrix formation, the result is the formation of? Four theories of mechanism of tooth formation have been put forward and accepted. Active and passive eruption. . This thirteenth edition, while retaining the same fundamentals and lucid writing style, reflects upon the recent advances and latest curriculum offered in Indian universities. A. Physiological tooth migration Q.4 Zones of pulp. Ligament Periodontal ligament traction Root growth What is tooth eruption ??? erupt Tooth eruption is a process in tooth development in which the teeth enter the mouth and become visible. . The ligament consists of a group of fibers made of a protein called collagen. The same force volume and different force direction makes different stress distribution on periodontal ligament, thus different periodontal reaction to the force. Write an essay on histology of periodontal ligament. The cushioned hammock theory, first proposed by Harry Sicher, was taught widely from the 1930s to the 1950s. In terms of Eruption sequence, the Mandibular or Maxillary teeth always erupt first and which erupts second? Periodontal ligament traction theory; BEHAVIORAL PEDODONTICS. This theory postulated that a ligament below a tooth, which Sicher observed under a microscope on a histologic slide, was responsible for eruption. Later, the "ligament" Sicher observed was determined to be merely an artifact created in . Over erupted C. Supra erupted D. Submerged. The traction force is presumed to be established by either the fibroblasts or collagen fibers found in the periodontal ligament , or by both . Q.8 Development of tongue. So long as the periodontal tissue is available, tooth movement occurs. 6. Drugs that interrupt proper formation of collagen in the ligament also interfere with eruption. Kindly say, the techniques and theory of periodontal instrumentation is universally compatible with any devices to read Periodontal flaps and techniques Periodontal Probe Basic Technique Periodontal Probe TechniquePeriodontal ligament traction theory PERIODONTAL LIGAMENT PART 4 How To Study PERIODONTICS In BDS Final Year? Last edited by a moderator: Apr 21, 2017. Periodontal ligament formation. 4 JM; Migration Or Drift Of Teeth Which of the following statement is false_____? Nursing bottle caries; PEDIATRIC ORTHODONTICS. Root elongation. This theory is based on the postulation that periodontal ligament (PDL)-dental follicle complex possesses eruptive force due to the trac- C. Periodontal ligament traction theory. 1 Topic. Teeth with out antagonist if erupt is called_____? If the noxious stimulus is chronic, there is a widening of the periodontal ligament space at the expense of bone resorption. A. Hydrodynamic theory B. Clone theory C. Periodontal ligament traction theory D. Vascular theory. Am J Orthod. 3. 10- it is a condition characterized by fusion of cementum or dentin to alveolar bone. Enumerate theories of eruption and write in detail about periodontal ligament traction theory. PDL traction theory; Succadeneous teeth; Super numerary teeth; Shedding Of Deciduous Teeth. Histology of osteoclasts 5 . The fibroblasts of the tooth-related part of the periodontal ligament pull the tooth with them thanks to the collagenous framework. 4. Oct 16, 2005 #6 Evo. Periodontal ligament traction theory : This theory denotes that the tooth eruption occurs through the generation of a traction force to bring the tooth into occlusion . Most accepted theory The periodontal ligament fibroblast have contractile property The fibroblasts are inter connected to each other - fibronexus The contractile forces are transmitted to the fibres to reorient them to help in eruption of teeth. Download Dr Teeth Apps using these links:Android users: https://play.google.com/store/apps/details?id=co.kevin.zjxor&hl=en_US&gl=USiOS users: https://apps.ap. Recent theories of eruption . Differences between maxillary 1st premolar and mandibular 1st premolar tooth. If we apply a force to the tooth, it will be transmitted to the bone by this periodontal ligament: Stretching will stimulate osteoblasts to lay down new bone while . The future TMJ shows development at? A. Resorption of roots of deciduous incisors and canines begins on their lingual surfaces B. Resorption of roots of deciduous molars begins on their inner surfaces C. Shedding of deciduous teeth is . A. Physiological tooth migration Q.7 Occlusal aspect of mandibular 1st premolar. 0. "The periodontal ligament, which is derived from the dental follicle, provides the force required for eruption mainly by fibroblast contraction" HOWEVER, in vitro tissue studies have limitations concerning this theory. 2.3. Hydrostatic pressure. A. Teeth with out antagonist if erupt is called_____? 3. Cell Motil . Q.5 Principle fibers of periodontal ligament. . With the closed exposure approach there is a greater risk of undermining resorption during the application of traction particularly if sufficient bone covering the crown was not removed at the time of exposure. Eruptive movement Movement of tooth to close the intermaxillary gap during eruption is due to_____? Bone bending and piezo-electric theory: Farrar. Periodontal ligament traction. PERIODONTOLOGY! Secondly, we proposed a new hypothesis regarding the primary roles of periodontal ligament cells (PDLCs) and osteocytes involved in OTM mechanisms and summarized the biomechanical and biological . The periodontal ligament (PDL) holds the tooth in the alveolus stretching between the cementum of the root dentine and the bone of the alveolus ('bundle bone' tissue). 5. This is considered to be a known factor in . 70 isolated and cultured DFCs and periodontal ligament cells . Movement of tooth to close the intermaxillary gap during eruption is due to_____? Write briefly about shedding of deciduous teeth; Short answers. 1- ROOT FORMATION THEORY: 2- BONE REMODELING THEORY: 3- VASCULAR PRESSURE THEORY 4- PERIODONTAL LIGAMENT TRACTION THEORY Sequence of eruption of Deciduous teeth Sequence of eruption of permanent teeth C. POST ERRUPTIVE PHASE (FUNCTIONAL ERUPTIVE PHASE): Histology of Post eruptive tooth movement: 1- Movements to accommodate growth of the jaws. Answer & Solution Discuss in Board. . Q.3 Seeding theory. Relaxin is a specialized hormone which was detected in the periodontal ligament providing proper remodeling of the soft tissue rather than the alveolar bone surrounding teeth. In the pressure side, the ligament . The problem was solved by applying orthodontic traction to the teeth for a limited period of time. 4. d)Periodontal traction theory: This theory states that the periodontal ligament is rich in fibroblasts that contain . Duetal system of major salivary glands. 2. Root formation. Mentor. The cushioned hammock theory, first proposed by Harry Sicher, was taught widely from the 1930s to the 1950s. periodontal ligament (PDL). This is known as the guidance theory, . Pre-eruptive movement It is made by the teeth germs. Tooth eruption has caused many historical discussions. Introduction to pediatric orthodontics; Periodontal ligament traction; Intermediate plexus; Cell rests of malassez; Oxytalin fibers; Fibroblasts; Periodontal ligament; Cells of PDL; Mast cell; Bone. [9] Bite forces theory: According to this theory, soft tissues of the dental follicle detect bite 1970 Feb;57(2):109-31. Mechanism of Tooth Eruption. When considering the periodontal implications of surgical exposure, an apically repositioned flap or closed eruption through keratinized gingival tissue is recommended for a labially ectopic canine. Periodontal ligament traction theory •Forces for tooth movement reside in PDL •Experimental studies on -Collagen synthesis -Barrier placement between erupting tooth -Contractility of fibroblasts 27 Dr. Vijay Wadhwan, Subharti Dental College, SVSU •Force generation by Over erupted C. Supra erupted D. Submerged 383. 0. With increased age and irritation which form of dentin is laid down? A. Objective: To investigate the distribution of distal and lateral forces produced by orthodontic asymmetric headgear (AHG) using mathematical models to assess periodontal ligament (PDL) influence and to attempt to resolve apparent inconsistencies in the literature. Age changes of pulp 3. Bone deposition and resorption Osteoid Bundle bone The periodontal ligament is the structure interposed between the tooth root and the alveolar bone, with an area of 0.25-0.5 mm. An orthodontic force compresses the periodontal ligament and alveolar bone adjacent to the advancing root, stimulating resorption of alveolar bone by . The process of eruption can be divided into 5 stages: pre-eruptive movement (movement of the developing tooth germ prior to the completion of the crown), intra-osseous eruption, mucosal penetration, pre-occlusal eruption, and post-occlusal eruption. Periodontal ligament traction theory: According to this theory, the periodontal ligaments-dental follicle complex exerts eruptive force via the traction power of the fibroblasts when they contract. Abnormalities of dental follicle as shown in certain diseases are associated with delayed tooth eruption. 6. Periodontal ligament traction: Eruptive force resides in the region known as dental follicle-periodontal ligament complex. I don't think the stem cell theory proposed above will do any good. •Fluid dynamic theory: Bien Vascular stenosis Aneurysm. Teeth with out antagonist if erupt is called____________? Taste buds 4. 12. 4. The axial movement of the tooth from its developmental position in the jaw to its final . 0. Neuromuscular theory or unification theory: This hypothesis expresses that the concurrent and adjusted powers of the # Techniques And Theory Of Periodontal Instrumentation # Uploaded By Karl May, techniques and theory of periodontal surgical techniques to treat periodontal disease have been documented as far back as 1862 when robicsek in hungary developed the gingivectomy gingiva gum ectomy removal to treat gum overgrowth a technique still Baumrind S, Buck D. Rate changes in cell replication and protein synthesis in the periodontal ligament incident to tooth movement. II. Q.6 Non-Keratinocytes. The performance of a tooth replacement by using a dental implant relies on the mechanical and biological capability of the anatomical substitute to restore lost physiological functions. 5. Stable. Impeded and unimpeded eruption rates were grossly retarded when a collagen crosslinking inhibitor lathyrogen 0.3% AAN (aminoacetonitrile) was added to the drinking water of young 45 - 50 gm . It is best thought of as the mean by which the teeth are positioned within the jaw for eruptive movement. This technique is mostly used for labially impacted canines (Figure 7). Many hypotheses were initially proposed, including biophysical traction forces exerted by the periodontal ligament (PDL) or pushing from the tooth root against the surrounding bone. B. Clone theory C. Periodontal ligament traction theory D. Vascular theory 382. Al- though the transseptal groups adjacent to the alveolar crest, as well as the principal fibers of the periodontal . traction of permanent teeth. is the axial or occlusal movement of the tooth within and from its developing site through the bone of the jaw and overlying mucosa to appear in the oral cavity and reach its functional position in the occlusal plane . I Stable B. . This theory postulated that a ligament below a tooth, which Sicher observed under a microscope on a histologic slide, was responsible for eruption. PDL Physiological response to heavy pressure applied for <1 s. Dental follicle theory 21 Reduced enamel epithelium cascade of intercellular signals recruits osteoclast to the follicle bone remodelling erution of teeth 2. C. Supra erupted. A. Physiological tooth migration B. 4 Topics. Bone deposition and resorption Osteoid Bundle bone One of the main theories which attempts to explain the phenomenon of tooth eruption suggests that periodontal ligament (PDL) fibroblasts move actively and pull the tooth with them out of its socket. • Periodontal ligament traction theory. the use of the compression/traction pair, a change that will contribute to the required uniformity. Stable B. At that time the roots are about half to pressure tooth which causes the tooth movement.2,7 two third complete.2,7,8 4) periodontal ligament traction: there is a good deal of evidence that the eruptive force resides in the dental follicle- C.PATTERN OF TOOTH MOVEMENT 2,7,8 periodontal ligament complex. . Periodontal ligament traction theory: According to this theory, the periodontal ligaments-dental follicle complex exerts eruptive force via the traction power of the fibroblasts when they contract. 1 2. Orthodontic traction is usually commenced soon after the surgical exposure. 3. Materials and methods: Mechanical models for AHG were constructed to calculate AHG force magnitudes and direction using the theory . 11-condition characterized by a cessation of eruption of a tooth. To find further support for this theory, we determined the changes in the shape and orientation of PDL fibroblasts induced by a transition from . factor in tooth eruption because of the traction power that fibroblasts have which may pull the tooth out during eruption. Selective deposition and resorbtion of bone around the roots or bone remodeling. Measurements of the isometric contractile forces generated by dog periodontal ligament fibroblasts in vitro . 4. Osteoclasts; The axial movement of the tooth from its developmental position in the jaw to its final . A. Over erupted. 4. Most widely accepted theory for dentinal hypersensitivity? dentally entering the periodontal ligament space. Vascular pressure theory Root formation Bone Remodeling Periodontal ligament traction This theory states that the periodontal ligament is rich in fibroblasts that contain contractile tissue. Key Features b-Cutting of the growing root and elimination of the periapical region does not stop eruption. Their eruption is accompanied by or preceded by the exfoliation of the deciduous mandibular central incisors. Share: Share. Description First published in 1944, Orban's Oral Histology and Embryology has become the classic text for successive generations of dental students. The contraction of these periodontal fibers (mainly the oblique group) result in tooth eruption. > Biology of tooth eruption of time, stimulating resorption of alveolar adjacent. 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