Homology of Ear Ossicles to the Reptilian Jaw Bones

Odontoma is defined as calcifying benign odontogenic tumor composed of various tooth tissues such as enamel, dentin, pulp, and cementum and representing the second most common odontogenic tumor of the jaw bones. These lesions are often associated with impacted permanent teeth. They are usually small, asymptomatic and diagnosed after routine radiographic examination. The aim of this work was to report a case of a compound odontoma in the anterior maxilla of a 35-year-old woman, which was causing the impaction of the maxillary left central incisor. A removal of the tumor was planned. An orthodontic approach was proposed as a surgical procedure for orthodontic traction of the impacted tooth. After 12 months, the clinical and radiographic examination revealed the eruption of the impacted incisor. The recommended treatment of compound odontoma is the complete removal of the tumour. An orthodontic approach may be indicated to correct any malocclusion or to perform the traction of the tooth, due to a possible impaction.

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Tinnitus: some thoughts about its origin

The Journal of Laryngology & Otology ◽

10.1017/s1755146300090089 ◽

1984 ◽

Vol 98 (S9) ◽

pp. 31-37 ◽

Cited By ~ 29

Author(s):

J. J. Eggermont

Keyword(s):

Hair Cells ◽

High Frequency ◽

Basilar Membrane ◽

Stimulus Frequency ◽

Low Frequency ◽

Nerve Fibers ◽

Ear Ossicles ◽

Stimulus Transduction ◽

Low Levels ◽

Inner Ear Fluids

An auditory sensation follows generally as the result of the sequence stimulus, transduction, coding, transformation and sensation. This is then optionally followed by perception and a reaction. The stimulus is usually airborne sound causing movements of the tympanic membrane, the middle ear ossicles, the inner ear fluids and the basilar membrane. The movements of the basilar membrane are dependent on stimulus frequency: high frequency tones excite only the basal part of the cochlea, regardless of the stimulus intensity; low frequency tones at low levels only excite the so-called place specific region at the apical end but at high levels (above 60–70 dB SPL) cause appreciable movement of the entire basilar membrane. Basilar membrane tuning is as sharp as that of inner hair cells or auditory nerve fibers (Sellick et al., 1982) at least in the basal turn of animals that have a cochlea in physiologically impeccable condition.

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Melanotic neuroectodermal tumor of infancy of the jaw bones: Update on the factors influencing survival and recurrence

Head & Neck ◽

10.1002/hed.25514 ◽

2018 ◽

Vol 40 (12) ◽

pp. 2749-2756 ◽

Cited By ~ 4

Author(s):

Flavia Sirotheau Correa Pontes ◽

Lucas Lacerda de Souza ◽

Daniel Cavalléro Colares Uchôa ◽

Andrea Maia Correa Joaquim ◽

Liliane Silva do Nascimento ◽

...

Keyword(s):

Neuroectodermal Tumor ◽

Jaw Bones ◽

Factors Influencing

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Type B Idiopathic Bone Defect of Mandible: An Etiopathogenic Dilemma

Case Reports in Dentistry ◽

10.1155/2012/482758 ◽

2012 ◽

Vol 2012 ◽

pp. 1-4

Author(s):

Aakarsh V. Jhamb ◽

Parul A. Jhamb ◽

Aparna Dave ◽

Vishwa Prakash Shetty

Keyword(s):

Bone Defect ◽

Type A ◽

Bone Defects ◽

Long Bones ◽

Type B ◽

Jaw Bones ◽

Pathologic Lesions ◽

Malignant Lesions ◽

Radiographic Interpretation

Etiopathogenesis of the pathologic lesions forms the basis for formulation of appropriate intervention and further prevention. There is still a vast unknown field that has to be explored to know the causative reason behind certain benign & malignant lesions. Idiopathic bone defects are nonodontogenic pseudocystic cavities that are seen in the long bones & jaw bones. Radiographic interpretation is at times inadequate in diagnosis of odontogenic & nonodontogenic radiolucent lesions involving jaw bones. Histopathology has different criteria to segregate this lesion. In this paper, we discuss a case of type B histopathological variant of idiopathic bone defect that may suggest an alternative pathogenesis from type A variant.

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Hox-A2 protein expression in mouse embryo middle ear ossicles

Morphologie ◽

10.1016/j.morpho.2018.09.002 ◽

2018 ◽

Vol 102 (339) ◽

pp. 243-249 ◽

Cited By ~ 2

Author(s):

S. Louryan ◽

Marie Lejong ◽

Myriam Choa-Duterre ◽

Nathalie Vanmuylder

Keyword(s):

Protein Expression ◽

Middle Ear ◽

Mouse Embryo ◽

Ear Ossicles

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Peripheral osteoma of the mandibular crest: a short case study

Journal of Oral Medicine and Oral Surgery ◽

10.1051/mbcb/2017020 ◽

2018 ◽

Vol 24 (1) ◽

pp. 29-32

Author(s):

Arthur Fourcade ◽

Benjamin Salmon ◽

François Le Pelletier ◽

Anne-Laure Ejeil

Keyword(s):

Cortical Bone ◽

Rare Case ◽

Tooth Extraction ◽

Histological Evaluation ◽

Rare Form ◽

Jaw Bones ◽

Peripheral Osteoma ◽

Slow Growing

Introduction: Osteoma is a benign slow-growing osteogenic neoplasm characterized by the proliferation of cancellous and/or cortical bone. Jaw bones are seldom affected. Observation: We observed a rare case of a patient with a peripheral mandibular osteoma, which was surgically removed. Comments: Frequently asymptomatic, a peripheral osteoma looks like a bony swelling that may be sessile or pedunculated. Imaging examinations show a well-circumscribed radio-opaque mass. Symptomatic osteomas must be surgically excised and submitted for histological evaluation. Conclusion: Excessive osseous healing following a tooth extraction may explain this rare form of osteoma.

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Two cases of secondary hyperparathyroidism that showed marked enlargement of jaw bones.

Journal of Japanese Society for Dialysis Therapy ◽

10.4009/jsdt1985.24.1183 ◽

1991 ◽

Vol 24 (8) ◽

pp. 1183-1189

Author(s):

Hiroyuki Ohmori ◽

Katsuhiko Arimoto ◽

Masafumi Taki ◽

Kiyowo Kosaka ◽

Shinichiro Tanaka

Keyword(s):

Secondary Hyperparathyroidism ◽

Jaw Bones

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Antagonistic interaction between Ezh2 and Arid1a coordinates root patterning and development via Cdkn2a in mouse molars

eLife ◽

10.7554/elife.46426 ◽

2019 ◽

Vol 8 ◽

Cited By ~ 1

Author(s):

Junjun Jing ◽

Jifan Feng ◽

Jingyuan Li ◽

Xia Han ◽

Jinzhi He ◽

...

Keyword(s):

Epigenetic Regulation ◽

Root Development ◽

Physiological Function ◽

Tooth Root ◽

Tooth Regeneration ◽

Jaw Bones ◽

Antagonistic Interaction ◽

Tooth Type ◽

Epigenetic Regulators

Patterning is a critical step during organogenesis and is closely associated with the physiological function of organs. Tooth root shapes are finely tuned to provide precise occlusal support to facilitate the function of each tooth type. However, the mechanism regulating tooth root patterning and development is largely unknown. In this study, we provide the first in vivo evidence demonstrating that Ezh2 in the dental mesenchyme determines patterning and furcation formation during dental root development in mouse molars. Mechanistically, an antagonistic interaction between epigenetic regulators Ezh2 and Arid1a controls Cdkn2a expression in the dental mesenchyme to regulate dental root patterning and development. These findings indicate the importance of balanced epigenetic regulation in determining the tooth root pattern and the integration of roots with the jaw bones to achieve physiological function. Collectively, our study provides important clues about the regulation of organogenesis and has general implications for tooth regeneration in the future.

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