Dentosphere : World of Dentistry

Internal resorption that has not totally perforated the root surface is best managed by which of the following:

# Internal resorption that has not totally perforated the root surface is best managed by which of the following?

A. Surgical curettage

B. Root canal treatment

C. Periodic recall and evaluation

D. Incision and drainage

E. Cveck’s Pulpotomy

The correct answer is B. Root canal treatment.

Root canal therapy is indicated for cases involving internal resorption where the root surface is not perforated by the defect.

Internal resorption may occur either in the pulp chamber or the root canal of the tooth and is most commonly caused by trauma and infection.

Infection or trauma results in an inflammatory response within the pulp resulting in abnormal vascularization and production of multinuclear odontoclasts, which initiate the process of resorption.

Root canal treatment is performed in cases of internal resorption where the root surface is not completely perforated. After filling the root canals and resorption defect, follow up radiographs are made after one year to determine if healing has occurred and the resorptive process is halted.

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Adverse effect of internally bleaching an endodontically treated tooth

# Which of the following is the most likely adverse effect of internally bleaching an endodontically treated tooth with superoxide?

A. Weakening of the remaining tooth structure

B. External cervical root resorption

C. Reinfection of the canal

D. Demineralization of tooth structure

The correct answer is B. External cervical root resorption.

The most common side effect of internally bleaching a tooth with superoxide is external cervical root resorption.

The presence of a glass ionomer barrier over the root filling material may help to reduce the instances external cervical root resorption if it is at least 4 mm in thickness.

The walking bleach technique using sodium perborate is NOT associated with external cervical root resorption.

Bleaching dentin does NOT weaken the tooth structure.

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The prognosis for internal bleaching is best if the etiology of the stain is:

# The prognosis for internal bleaching is best if the etiology of the stain is:

A. Amalgam restorations

B. Necrotic pulp tissue

C. Precipitation of metallic salts

D. Silver containing root canal sealers

The correct answer is B. Necrotic pulp tissue.

Internal bleaching treatments are most effective among root canal treated teeth which have internal stains or discoloration due to blood, necrotic tissues and fluids that could have leaked in prior to root canal therapy.

Internal tooth bleaching is done by placing peroxide directly into the pulp chamber of a root canal treated tooth. The peroxide will then directly work on the stains within the tooth structure.

Staining from the silver containing root canal sealers and from mercury of amalgam restorations appear very dark. These stains are seldom treated by bleaching. Restorative treatments provide the most esthetic result because they remove or cover up these stains.

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Which of the following types of fibers are found in loose connective tissue?

# Which of the following types of fibers are found in loose connective tissue?

a. Yellow elastic and white collagen.

b. White fibrous, elastic, and reticular.

c. Elastic and collagenous.

d. Fine reticular

The correct answer is: A. Yellow elastic and white collagen.

Yellow elastic and white collagen are found in loose connective tissue. White fibrous, elastic, and reticular fibers are found in dense irregular connective tissue. Elastic and collagenous fibers are found in elastic cartilage. Fine reticular fibers are found in reticular tissue.

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Bone replaces cartilage by which of the following processes?

# Bone replaces cartilage by which of the following processes?

a. Interstitial growth

b. Endochondral development

c. Intramembranous bone formation

d. Membranous bone formation

The correct answer is: B. Endochondral development.

Interstitial growth is growth within the cartilage matrix by each cartilage cell enlarging

and forming matrix around each cell.

Bone replaces cartilage by a process termed endochondral bone development.

Intramembranous bone is formed when collagen fibers of connective tissue organize into closely knit meshwork, and this matrix gradually calcifies into bone.

Intramembranous bone formation is also known as membranous bone formation.

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