It’s the last oralhistology lecture!

Please say itisn’t so…

March 7, 2008 Repair & Regeneration of Oral Tissues

What do African termites use to “glue” their mounds together?

CATEGORY: 5th grade biology & nature

QuickTime™ and aTIFF (Uncompressed) decompressor

are needed to see this picture.

Macrotermes bellicosus

A. Cementum

B. Moss

C. Saliva

D. Feces

E. Elmer’s glue

The structure is built primarily with a combination of saliva and fine-grained soil particles (coarse sand is not appropriate).

Partitions within the structure are made from carton - a combination of saliva and fecal pellets

Fungal gardens grow on this material (spores having been collected from the outside world).

The large mounds of Macrotermes usually have tall columns which serve as air vents to regulate the inside temperature.

Saliva

QuickTime™ and aTIFF (Uncompressed) decompressor

are needed to see this picture.

Repair & Regeneration of Oral Tissues

I. Wound Healing in Oral Mucosa

II. Reparative Phase

III. Repair of Periodontium

IV. Repair of the Tooth

Repair & Regeneration of Oral Tissues

2 Responses of Cells to Stimuli:

1. Adaptation

2. Death

Repair & Regeneration of Oral Tissues

Examples of Cellular Adaptation:

a) Cellular swelling (hepatitis)

Repair & Regeneration of Oral Tissues

Examples of Cellular Adaptation:

a) Cellular swelling (hepatitis)

Repair & Regeneration of Oral Tissues

Examples of Cellular Adaptation:

b) Storage of offending substance (foreign body

reaction)

Repair & Regeneration of Oral Tissues

Examples of Cellular Adaptation:

c) Hypertrophy vs Hyperplasia

Cardiac Hypertrophy: increased thickness of heart wall

Repair & Regeneration of Oral Tissues

Examples of Cellular Adaptation:

c) Hypertrophy vs Hyperplasia

Gingival Hyperplasia: overgrowth of gingiva (dilantin)

Repair & Regeneration of Oral Tissues

Examples of Cellular Adaptation:

d) Metaplasia (respiratory tract mucosa)

Repair & Regeneration of Oral Tissues

Examples of Cellular Adaptation:

e) Atrophy (dentate vs edentulous)

Repair & Regeneration of Oral Tissues

I. Wound Healing in Oral Mucosa

Utilizes same principles as skin

BUT scar tissue does not form to same degree

What does this difference mean to you as dentists and dental hygienists?

Repair & Regeneration of Oral Tissues

I. Wound Healing in Oral Mucosa

What are some characteristics of scars in skin?

http://www.emedicine.com/plastic/topic411.htm

Color, Lack of hair/sweat appendages, Firm consistency, etc.

Repair & Regeneration of Oral Tissues

I. Wound Healing in Oral Mucosa

What are some characteristics of scars in skin?

Color, Lack of hair/sweat appendages, Firm consistency, etc.

Repair & Regeneration of Oral Tissues

I. Wound Healing in Oral Mucosa

Type of wound influences healing

http://surgclerk.med.utoronto.ca/WoundHeal/cases.htm

This 75 year old female was attacked by a dog.

Repair & Regeneration of Oral Tissues

www.sharkattackphotos.com/

Great White shark attack photo gallery - an attack in Aldinga Beach Australia. Victim required 462 stiches.

Repair & Regeneration of Oral Tissues

I. Wound Healing in Oral Mucosa

A. Healing by primary intention: clean, incised wound, able to approximate edges

B. Healing by secondary intention: large wound, unable to approximate edges

C. Healing by tertiary intention: infected wound

Repair & Regeneration of Oral Tissues

I. Wound Healing in Oral Mucosa

http://solutions.3m.com/wps/portal/3M/en_GB/skin-care/wound-resource-centre

Repair & Regeneration of Oral Tissues

I. Wound Healing in Oral Mucosa

http://solutions.3m.com/wps/portal/3M/en_GB/skin-care/wound-resource-centre

Repair & Regeneration of Oral Tissues

I. Wound Healing in Oral Mucosa

http://www.emedicine.com/asp/image

Surgical closure of wound with tissue flap

Repair & Regeneration of Oral Tissues

II. Reparative Phase

http://www.emedicine.com/asp/image

Repair & Regeneration of Oral Tissues

II. Reparative Phase

What is a keloid?

QuickTime™ and aTIFF (Uncompressed) decompressor

are needed to see this picture.

QuickTime™ and aTIFF (Uncompressed) decompressor

are needed to see this picture.

Repair & Regeneration of Oral Tissues

II. Reparative Phase

What is a keloid?

Beware of nonessential surgery.

Keloid: “A scar that doesn't know when to stop.”

Keloids are an overgrowth of scar tissue at the site of a healed skin injury.

Repair & Regeneration of Oral Tissues

III. Repair of Periodontium Can teeth be reimplanted and remain vital? What are some potential complications?

Ankylosis = fusion of tooth to bone

Pulpal death = abscess, granuloma, cyst

Repair & Regeneration of Oral Tissues

III. Repair of Periodontium

Repair & Regeneration of Oral Tissues

lV. Repair of The ToothEnamel? Dentin? Pulp? Cementum?

Repair & Regeneration of Oral Tissues

IV. Repair of The Tooth

95

Dead Tracts

IV. Repair of The Tooth

Reparative (tertiary) dentin

Repair & Regeneration of Oral Tissues