This document provides an overview of the mandible, including its development, anatomy, age-related changes, and clinical applications. It discusses how the mandible develops from the first pharyngeal arch and ossifies through both intramembranous and endochondral bone formation. The anatomy of the mandible is described in detail, including its various parts and structures. Age-related changes to the mandible from birth through adulthood and old age are also reviewed. Finally, the document discusses some applied clinical aspects of the mandible relating to dislocations, fractures, and considerations for surgery.
PRENATAL GROWTH OF MANDIBLE
Occurs between the 4th and 7th week of intrauterine life.
4th week of intrauterine life
Formation of the head fold
Following which the developing brain and the pericardium form 2 prominent bulges on the ventral aspect of the embryo.
The 2 bulges are separated from each other by a shallow depression called stomatoedum (corresponding to the primitive mouth).
Floor of the stomatodeum is formed by the Buccopharyngeal membrane, which separates the stomatodeum from the foregut.Soon, mesoderm covering the developing forebrain proliferates, and forms a downward projection that overlaps the upper part of the stomatodeum – this downward projection is called frontonasal process.
PRENATAL GROWTH OF MANDIBLE
Occurs between the 4th and 7th week of intrauterine life.
4th week of intrauterine life
Formation of the head fold
Following which the developing brain and the pericardium form 2 prominent bulges on the ventral aspect of the embryo.
The 2 bulges are separated from each other by a shallow depression called stomatoedum (corresponding to the primitive mouth).
Floor of the stomatodeum is formed by the Buccopharyngeal membrane, which separates the stomatodeum from the foregut.Soon, mesoderm covering the developing forebrain proliferates, and forms a downward projection that overlaps the upper part of the stomatodeum – this downward projection is called frontonasal process.
Growth and development of mandible in childrenDr. Harsh Shah
a brief idea about the development of mandible for indian students looking for a quick review from dentistry department
all the best to students
Presented by : Harsh SHah
Dept. of Orthodontics
SDDCH PBN
detailed ppt on mandible, covering aspects such as anatomy, development, age changes, growth, muscle attachment, nerve and arterial supply and anomalies.
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
Growth and development of mandible in childrenDr. Harsh Shah
a brief idea about the development of mandible for indian students looking for a quick review from dentistry department
all the best to students
Presented by : Harsh SHah
Dept. of Orthodontics
SDDCH PBN
detailed ppt on mandible, covering aspects such as anatomy, development, age changes, growth, muscle attachment, nerve and arterial supply and anomalies.
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The mandible or lower jaw, is the largest & strongest bone of the face. The word “Mandible” is derived from Greek word
“mandere” – to masticate or chew. The Latin word “ mandibula” – lower jaw. It is horse-shoe shaped & the only movable bone of skull. Growth and development of an individual is divided into two periods Prenatal period and Post natal period. The first structure to develop in the primodium of the lower jaw is the mandibular division of trigeminal nerve that precedes the mesenchymal condensation forming the first [mandibular] arch. Endrocondral bone formation is seen in The condylar process, The coronoid process and The mental process. OUTER SURFACE OF MANDIBLE
1. External oblique line - origin to buccinator, depressor inferioris, depressor anguli oris.
2. Incisive fossa - origin of mentalis, mental slips of orbicularis oris.
3. Lateral surface of ramus - insertion for masseter.
4. Lower border - deep cervical fascia and platysma.
5. Postero-superior lateral surface of ramus - parotid gland.
6. Lateral surface of neck - attachment to lateral ligament of temperomandibular joint , parotid gland.
INNER SURFACE OF MANDIBLE
1. Mylohyoid line - origin to mylohyoid muscle , attachment to superior constrictor of pharynx, pterygomandibular raphae.
2. Medial surface of ramus - medial pterygoid muscle attachment.
Superior genial tubercles – genioglossus.
3. Inferior genial tubercles – origin to geniohyoid.
4. Lingula - sphenomandibular ligament.
5. Apex of coronoid process - temporalis attachment.
6. Pterygoid fovea - lateral pterygoid muscle.
7. Diagastric fossa - anterior belly of diagastric.
ARTERIAL SUPPLY OF MANDIBLE:
It is mainly divided into 2 categories :
1. Endosteal/ Central blood supply
2. Periosteal/ Peripheral blood supply
Central blood supply is via Inferior Alveolar Artery except the coronoid process which is supplied by Temporalis muscle vessels.
Inferior alveolar artery arises from maxillary artery which in turn is a branch of External carotid artery.
Inferior alveolar artery branches :
Lingual branch
Mylohyoid branch
Incisive branch
Mental branch
Peripheral blood supply is mainly via Periosteum via the nutrient vessels those penetrate the cortical bone and anastamose with the branches of Inferior alveolar artery.
VENOUS SUPPLY OF MANDIBLE
Drains into Internal Jugular vein and External Jugular vein through Maxillary vein, Facial vein and pterygoid plexus.
“Growth was concieved by an anatomist, born to a biologist, delivered by a physician, left on a chemist doorstep, and adopted by a physiologist.At an early age- she eloped with a statistician, divorced him for a psycologist, and is now wooed, alternatively and concurrently, by an endrocrinologist, a biochemist,a physicist, a mathematician, an orthodontist, a eugenicist and the children’s bureau”.
THE PRENATAL LIFE IS DIVIDED INTO THREE PERIODS –
1.PERIOD OF THE OVUM
2.PERIOD OF THE EMBRYO
3.PERIOD OF THE FETUS
About the fourth week of intrauterine life, the pharyngeal arches are laid down
The first arch is called the mandibular arch and the second arch the hyoid arch.
Growth of mandible /certified fixed orthodontic courses by Indian dental aca...Indian dental academy
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.
Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
00919248678078
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
Development of mandible / fixed orthodontics courses for general dentistsIndian dental academy
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
Similar to 1mandiblelaxmi 150502145137-conversion-gate01 (20)
What is greenhouse gasses and how many gasses are there to affect the Earth.moosaasad1975
What are greenhouse gasses how they affect the earth and its environment what is the future of the environment and earth how the weather and the climate effects.
Seminar of U.V. Spectroscopy by SAMIR PANDASAMIR PANDA
Spectroscopy is a branch of science dealing the study of interaction of electromagnetic radiation with matter.
Ultraviolet-visible spectroscopy refers to absorption spectroscopy or reflect spectroscopy in the UV-VIS spectral region.
Ultraviolet-visible spectroscopy is an analytical method that can measure the amount of light received by the analyte.
Earliest Galaxies in the JADES Origins Field: Luminosity Function and Cosmic ...Sérgio Sacani
We characterize the earliest galaxy population in the JADES Origins Field (JOF), the deepest
imaging field observed with JWST. We make use of the ancillary Hubble optical images (5 filters
spanning 0.4−0.9µm) and novel JWST images with 14 filters spanning 0.8−5µm, including 7 mediumband filters, and reaching total exposure times of up to 46 hours per filter. We combine all our data
at > 2.3µm to construct an ultradeep image, reaching as deep as ≈ 31.4 AB mag in the stack and
30.3-31.0 AB mag (5σ, r = 0.1” circular aperture) in individual filters. We measure photometric
redshifts and use robust selection criteria to identify a sample of eight galaxy candidates at redshifts
z = 11.5 − 15. These objects show compact half-light radii of R1/2 ∼ 50 − 200pc, stellar masses of
M⋆ ∼ 107−108M⊙, and star-formation rates of SFR ∼ 0.1−1 M⊙ yr−1
. Our search finds no candidates
at 15 < z < 20, placing upper limits at these redshifts. We develop a forward modeling approach to
infer the properties of the evolving luminosity function without binning in redshift or luminosity that
marginalizes over the photometric redshift uncertainty of our candidate galaxies and incorporates the
impact of non-detections. We find a z = 12 luminosity function in good agreement with prior results,
and that the luminosity function normalization and UV luminosity density decline by a factor of ∼ 2.5
from z = 12 to z = 14. We discuss the possible implications of our results in the context of theoretical
models for evolution of the dark matter halo mass function.
Observation of Io’s Resurfacing via Plume Deposition Using Ground-based Adapt...Sérgio Sacani
Since volcanic activity was first discovered on Io from Voyager images in 1979, changes
on Io’s surface have been monitored from both spacecraft and ground-based telescopes.
Here, we present the highest spatial resolution images of Io ever obtained from a groundbased telescope. These images, acquired by the SHARK-VIS instrument on the Large
Binocular Telescope, show evidence of a major resurfacing event on Io’s trailing hemisphere. When compared to the most recent spacecraft images, the SHARK-VIS images
show that a plume deposit from a powerful eruption at Pillan Patera has covered part
of the long-lived Pele plume deposit. Although this type of resurfacing event may be common on Io, few have been detected due to the rarity of spacecraft visits and the previously low spatial resolution available from Earth-based telescopes. The SHARK-VIS instrument ushers in a new era of high resolution imaging of Io’s surface using adaptive
optics at visible wavelengths.
Professional air quality monitoring systems provide immediate, on-site data for analysis, compliance, and decision-making.
Monitor common gases, weather parameters, particulates.
Comparative structure of adrenal gland in vertebrates
1mandiblelaxmi 150502145137-conversion-gate01
1.
2.
3. CONTENTS
INTRODUCTION
DEVELOPMENT OF MANDIBLE
GROWTH OF MANDIBLE
ANATOMY OF MANDIBLE
AGE CHANGES OF MANDIBLE
APPLIED ASPECTS
CONCLUSION
REFERENCES
4. INTRODUCTION
The mandible or lower jaw, is the largest & strongest bone of the
face.
The word “Mandible” is derived from Greek word
“mandere” – to masticate or chew.
The Latin word “ mandibula” – lower jaw.
It is horse-shoe shaped & the only movable
bone of skull.
Lower facial skeleton.
6. Prenatal Growth of mandible
About the 4th week of IU life, the developing brain & pericardium
form two prominent bulges which are separated by the primitive oral
cavity or stomodeum.
The floor of stomodeum is formed by the bucco-pharyngeal
membrane, which separates it from forgut.
Pharyngeal arches are laid in approximation
with stomodeum.
7. In humans, six pairs of pharyngeal arches form on either side of the
pharyngeal forgut.
The 5th arch disappears after its formation
1st arch is known as mandibular arch,
2nd arch as hyoid arch.
8. Each arch has
1. Outer covering of ectoderm
2. An inner covering of endoderm
3. Core of mesoderm.
Arches are separated from each other by
1.Pharyngeal cleft or groove externally
2.Pharyngeal pouches internally
9. Each arch contains
1. A cartilaginous supporting element
2. An arch artery
3. An arch-associated cranial nerve
4. A muscular component –
branchiomere
10. The development of face begins in the 4th to 8th week of intra-uterine
life.
The face is derived from
An unpaired frontonasal process
A pair of Maxillary process
A pair of Mandibular process
11. Mandibular arch gives of a bud from dorsal
end called maxillary process
It grows ventro-medially called mandibular
process.
Mandibular processes of both sides grow
towards each other & fuse in midline.
12. MECKEL’S CARTILAGE:
Meckel’s cartilage is derived from
1st branchial arch around 41st – 45th
day of IU life.
It extends from the cartilagenous otic
capsule to the midline.
Provides a framework around which
the growth of the mandible occurs.
13. Meckel’s cartilage lacks the enzyme alkaline phosphatase found in
the ossifying cartilages, thus precluding its early ossification.
A major portion of the Meckel’s cartilage disappears. It persists until
as long as the 24th week IU life
14. Remaining part develops:
1. Mental ossicles.
2. Incus & Malleus.
3. Spine of sphenoid bone.
4. Anterior ligament of malleus.
5. Spheno – mandibular
ligament.
15. Mandible is the second bone to ossify in the body.
It is partly membranous & partly cartilaginous in ossification.
• Incisive part below
symphysis menti
• Coronoid
• Condyloid process
Cartilage
• Whole of body except lower
incisive part
• Lower half of ramus upto
mandibular foramen
Membrane
16. The 1st structure to develop in the primordium of the lower jaw is the
mandibular division of the trigeminal nerve.
6th week of IU life → a single ossification centre for each half of
mandible in the region of the bifurcation of inferior alveolar nerve.
Meckel’s cartilage
Inferior alveolar nerve
Mental branch
Initial site of osteogenesis
17. Ossification spreads below & around the inferior alveolar nerve.
The Meckel’s cartilage is surrounded by bone and ossification then
stops at the lingula
The bony plate extends towards the midline where it comes to lie in
close relationship with the bone forming on the opposite side.
However, two plates of bone remain separated at the Mandibular
symphysis by fibrous tissue.
Bony union takes place at around 18 months after birth.
18. Endochondral bone formation seen in 3 areas.
They appear between the 10th and 14th week of IU life.
19. Condylar process:
5th week of IU life- mesenchymal condensation at the ventral aspect
mandible.
10th week - develops into a cone shaped cartilage.
14th week- begins ossifying.
4th month - fuses with the Ramus of the developing mandible.
It persists as Growth cartilage & Articular cartilage
20. Coronoid process:
10-14th week of IU life→ Secondary accessory cartilage appear in
the region of coronoid process.
It grows as a response to Temporalis muscle.
This accessory cartilage fuses with the ramus and disappears by
birth.
21. Mental region:
On either side of the symphysis, one or two cartilages appear which
ossify to form the mental ossicles at 7th month of IU life.
These get incorporated into the intramembranous bone when the
symphysis ossify completely ( 1st year of post natal life.)
22. Postnatal Growth Of Mandible
Overall pattern of growth of the mandible can be represented in two
ways,
1) If the cranium is the reference area ,the chin moves
downward and forward.
2) According to the data from the vital staining experiments,
the posterior surface the ramus, the condyle and coronoid
process are principal sites of growth.
Growth is quite general during the first year of life with all surfaces
showing bone apposition.
Mandibular growth becomes more selective.
23. The mandible can be divided into several sub-units like
Chin
Alveolar process
Body
Lingual tuberosity
Ramus
Angular process
Coronoid process
Condylar process
24. Chin:
1-2 years→ chin prominence is seen
The mental protuberance forms by bone deposition
The change in the contour occurs by following two mechanism.
1) The area just above the chin and
the base of the alveolar process,
is a resorptive area.
2) There is forward translation of
chin as mandible grows forward.
26. Body: (corpus)
The length of the body increases as the ramus moves posteriorly
27. Lingual tuberosity:
It forms the boundary between
the ramus & body
A combination of the resorption
and deposition accentuates its
prominence.
28. Ramus:
The ramus is seen to move posteriorly due to deposition at its
posterior border and resorption on its anterior border
29. Angle:
The combined deposition and resorption causes flaring of the angle
of the mandible.
30. Coronoid process :
Enlow’s enlarging “V” principle.
Birth: Coronoid process is at higher
level than condyloid process.
Childhood: Coronoid & condyloid
processes are at same level.
Adult: Condyloid process is at
higher level.
31. Condyle:
Condylar growth rate increases at puberty and reaches its peak by
12-14 years.
The growth ceases at around 20 years
Role of condyle:
o Primary displacement
o Carry away phenomenon
32. ANATOMY OF MANDIBLE
Mandible
Body Two Rami
Surfaces SurfacesBorders Borders Processes
External/
Outer
Internal/
Inner
Superior/
Alveolar
Inferior/
Base
CoronoidCondyloidLateral/
External
Medial/
Internal
Anterior Posterior Superior Inferior
35. Body: Superior & Inferior border
The upper border, the alveolar part, contains 16 alveoli for roots of
the teeth.
The lower border, the base, extends posterolaterally from the
symphysis into that of ramus behind the third molar.
40. Ramus: Coronoid process
A flat, triangular projection
from the anterosuperior part
of the ramus
Lateral to pterygoid plate
Medial to zygomatic process
Anteriorly continuous with ramus
Posterior border bounds the
mandibular notch/incisure
41. Ramus: Condylar process
Strong upward projection from postero-superior part of ramus
It consists:
1. Upper part- Head
2. Lower part- Neck
58. Surgical consideration:
• Mandibular canal Partially or completely edentulous cases→
placement of implants difficult.
• Injury to the mental nerve paraesthesia to the skin of the chin, the
lower lip and the labial mucosa
• Injury to the lingual nerve during flap reflection, releasing incisions,
anesthestic injections
59. External oblique ridge
Resective surgery difficult because of the amount of bone to be
removed.
Apical positioning of the flap is difficult in these areas.
A high buccinator attachment results in a shallow vestibule, making
grafting procedures difficult.
60. Mandibular tori
The mucosa over the tori region is usually thin and hence is subject
to tearing.
Source of autogenous bone for grafting procedures.
61. Mylohyoid ridge
A prominent ridge may →broad bony ledge resulting in limited
surgical access and also makes flap reflection difficult.
62. Coronoid process
A prominent coronoid process may be in close proximity to the
maxillary tuberosity resulting in limited surgical access
Genial tubercle
In cases of severe horizontal bone loss they may pose a problem
during implant placement and flap reflection
Alveolar process
Prominent teeth results in marginal tissue recession, bony dehiscence
or fenestration
63. CONCLUSION:
The selection of an appropriate surgical technique that can
best satisfy the treatment goals & objectives is directly influenced by
through knowledge of anatomic relations between bone, soft tissues
& teeth. The study of anatomy of mandible & surrounding structures
is essential
64. REFERENCES:
Gray’s anatomy, 38th edition.
Human anatomy, B.D Chaurasia, 4th edition.
Essentials of human anatomy, A.K Datta, 2nd edition
Fundamentals of human anatomy, N Chakraborty.
Human embryology, William Larsen
Contemporary orthodontics ,Proffit ,4th edition.
Text book of orthodontics ,S.I Bhalaji ,3rd edition.
65.
66. Discuss the development, ossification & age changes of the
mandible (20 marks)
Discuss in detail “ Trigeminal nerve” (20 marks)
Describe in brief the functional anatomy of TMJ (20 marks)
Discuss the related structures of maxilla & mandible to
determine the periodontal surgical procedure (20 marks)
Describe muscles of mastication with their development, nerve
supply & action (20 marks)
Submandibular salivary gland (5 marks)
Inferior alveolar nerve (5 marks)
Describe branches of mandibular nerve & structures supplied by
them (5 marks)