Exam 1 CH 37 Sealants

Question 1

In sealant placement, the enamel surface is prepared by the application of phosphoric acid, which etches the surface to provide mechanical retention for the sealant?

Answer 1

Acid Etchant

Question 2

plastic material used for dental sealants?

Answer 2

Bis-GMA (bisphenol A-glycidyl methylacrylate)

Question 3

In general, the resistance to flow or alteration of shape by any substance as a result of molecular cohesion?

Answer 3

Viscosity

Question 4

Physical adherence of one substance to another; the adherence of a sealant to the enamel surface is accomplished by an acid-etching technique hat leaves microspaces between the enamel rods; the sealant becomes mechanically locked (bonded) in these microspaces?

Answer 4

Bonding (mechanical)

Question 5

Criteria for ideal sealant ?

Answer 5

• achieve prolonged bonding to enamel
• biocompatible w/ oral tissues
• simple application procedure
• free-flowing, low viscosity material capable of entering narrow fissures
• low solubility in the oral environment

Question 6

Indications for sealant placement?

Answer 6

• Xerostomia
• Ortho
• Diet high in sugars
• Incipient pits and fissures caries

Question 7

Sealants should be placed on?

Answer 7

• Newly erupted teeth
• Deep, irregular pits and fissures
• Other restorations/carious lesions

Question 8

Contraindications for sealant placement?

Answer 8

• Proximal Caries
• Shallow pits/fissures
• Low caries risk
• Tooth not fully erupted
• Primary tooth near exfoliaton

Question 9

T/F The bacteria in incipient dental caries at the base of a well-sealed pit or fissure have no access to nutrients required for survival

Answer 9

True

Question 10

Filler Content; Increases bond strength and resistance to abrasion and wear. Increased viscosity is?

Answer 10

Filled

Question 11

Filler Content; no particles (clear) Less resistant to wear. May not require occlusal adjustment after placement?

Answer 11

Unfilled

Question 12

Filler Content; Enhances caries resistance. Helps remineralize incipient caries t base of pit or fissures?

Answer 12

Fluoride releasing

Question 13

What is the purpose of acid etch?

Answer 13

To produce irregularities or micropores in the enamel. It allows the liquid resin to bond or mechanical locking

Question 14

What is the purpose of sealants?

Answer 14

To seal off pits/fissures

To prevent bacteria/initiation of dental caries

Question 15

A pit and fissure sealant is an?

Answer 15

Organic polymer (resin)

Question 16

T/F A pit and fissure sealant is an organic polymer (resin) that flows into the pits and fissure of a posterior tooth and bonds by mechanical retention to the tooth

Answer 16

True

Question 17

An organic polymer resin flows into the pits and fissures and bonds by ?

Answer 17

Mechanical retention to the tooth

Question 18

Fluoride is used to protect_______, while sealants reduce incidence of _________?

Answer 18

Smooth tooth surface

Occlusal Caries

Question 19

Incidence of New pit and fissure Caries can be lowered by?

Answer 19

86%