Dentosphere : World of Dentistry

The mean daily eruption velocity of tooth is _______ micrometer/day.

# The mean daily eruption velocity of tooth is _______ micrometer/day.

A. 51

B. 71

C. 61

D. 81

The correct answer is B. 71 micrometer per day.

The mean daily eruption velocity was seen to be 71µm / day. It is also believed that the effect of eruption significantly increases in supine position overnight.

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Which periodontal fibers are consistent and are reconstructed even after the destruction of alveolar bone?

# Which periodontal fibers are consistent and are reconstructed even after the destruction of alveolar bone?

A. Apical

B. Oblique

C. Alveolar crest group

D. Transseptal

The correct answer is D. Transseptal.

Transseptal group: Extends interproximally over alveolar bone crest and are embedded in the cementum of adjacent teeth. They are reconstructed even after destruction of the alveolar bone has occurred in the periodontal disease and are responsible for returning teeth to their original state after orthodontic therapy.

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Gracey curette number 17/18 is used for:

# Gracey curette number 17/18 is used for:

A. Mesial surfaces of anterior teeth

B. Distal surfaces of anterior teeth

C. Mesial surfaces of posterior teeth

D. Distal surfaces of posterior teeth

The correct answer is D. Distal surfaces of posterior teeth.

Double-ended Gracey curettes are paired in the following manner:

Gracey #1-2 and 3-4: Anterior teeth

Gracey #5-6: Anterior teeth and premolars

Gracey #7-8 and 9-10: Posterior teeth: facial and lingual

Gracey #11-12: Posterior teeth: mesial

Gracey #13-14: Posterior teeth: distal

Single-ended Gracey curettes can also be obtained; a set of these curettes comprises 14 instruments. Although these curettes are designed to be used in specific areas, an experienced operator can adapt each instrument for use in several different areas by altering the position of his or her hand and the position of the patient.

Recent additions to the Gracey curette set have been the Gracey #15-16 and 17-18. The Gracey #15-16 is a modification of the standard #11-12 and is designed for the mesial surfaces of posterior teeth.

The Gracey #17-18 is a modification of the #13-14. It has a terminal shank elongated by 3 mm and a more accentuated angulation of the shank to provide complete occlusal clearance and better access to all posterior distal surfaces.

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Refractory periodontitis is aggravated by:

A. Areca nut chewing

B. Smoking

C. Menstruation

D. Hormone PG and oestrogen

The correct answer is B. Smoking.

The impact of cigarette smoking on the long-term effects of periodontal therapy in a population undergoing Supportive Periodontal Therapy (SPT) has been reported. Smokers displayed less favorable healing responses both at re-evaluation and during a 6-year period of SPT (Baumert-Ah et al. 1994). This was confirmed in another study in which higher percentages of heavy smokers experienced more multiple (≥9) residual pockets (≥5 mm) than non-smokers both after active periodontal therapy (31.2% versus 7.3%, respectively) and after 11 years of SPT (52.4% versus 14.8%, respectively) (Matuliene et al. 2008). In this study, heavy smoking was found to be a significant risk factor for periodontitis progression. Moreover, smoking was the main statistically significant risk factor for the recurrence of periodontitis after 10.5 years of SPT in the 84 patients with periodontitis stage IV, grade C. More than half of the current smokers in this study showed a recurrence of disease at re-examination and had a ten-fold increased risk for a relapse compared with non-smokers (Bäumer et al. 2011).

Reference: Lindhe’s Clinical Periodontology and Implant Dentistry, 7th Edition

After curettage, re-epithelialization occurs in:

# After curettage, re-epithelialization occurs in:

A. 1-2 days

B. 2-3 days

C. 2-7 days

D. Two weeks

The correct answer is C. 2-7 days.

Immediately after curettage, a blood clot fills the pocket area, which is totally or partially devoid of epithelial lining. Hemorrhage is also present in the tissues with dilated capillaries and abundant polymorphonuclear leukocytes, which appear on the wound surface. This is followed by a rapid proliferation of granulation tissue with a decrease in the number of small blood vessels as the tissue matures.

The restoration and epithelialization of the sulcus generally require 2 to 7 days, and restoration of the junctional epithelium occurs in animals as early as 5 days after treatment. Immature collagen fibers appear within 21 days. Healthy gingival fibers that are inadvertently severed from the tooth and tears in the epithelium are repaired during the healing process.

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With the increase of age, keratinization of gingiva:

# With the increase of age, keratinization of gingiva:

A. Increases

B. Decreases

C. Remains same

D. None of the above

The correct answer is B. Decreases.

Thinning and decreased keratinization of the gingival epithelium have been reported with age. The significance of these findings could mean an increase in epithelial permeability to bacterial antigens, a decreased resistance to functional trauma, or both.

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