A. Increase the surface area
B. Permit chemical bonding between resin and enamel
C. Create surface irregularities in enamel for better mechanical retention of resin
D. Condition the tooth surface for better wetting
Related Mcqs:
- Acid-etching is done for_______________?
A. 30 seconds
B. 60 seconds
C. 90 seconds
D. 120 seconds - Etching depth after 30 sec for orthodontic bracket with orthophosphoric acid is_________________?
A. 10 um – 20 um
B. 3 um – 9 um
C. 50 um – 110 um
D. 200 um – 250 um - Most advantageous indication of acid etching is______________?
A. Decrease micro leakage
B. Decrease polymerization shrinkage
C. Decrease coefficient of thermal expansion
D. Decrease porosity in restorative material - One of the claims for the superiority composite resin restoration over silicate cement restorations is that the resin restorations_____________?
A. Prevent galvanic action
B. Are practically insoluble in oral fluids
C. Adapt to the walls of the cavity better
D. Have a higher coefficient of thermal expansion - Etching of dentin does not include_____________?
A. Removal of smear layer
B. Exposure of collagen fibers
C. Opening of dentinal tubules
D. Increases surface energy - The last primary tooth to be replaced by a permanent tooth is usually the_____________?
A. Maxillary second molar
B. Mandibular second molar
C. Maxillary canine
D. Mandibular canine - A new tooth is erupting in the mouth of a one and a half year old child. This tooth is most likely to be a decidous___________?
A. Maxillary central incisor
B. Mandibular lateral incisor
C. Maxillary lateral incisor
D. Maxillary canine - The condition involved with an unerupted tooth or impacted tooth is _________________?
A. Dentigerous cyst
B. Mural ameloblastoma
C. Adenomatoid odontogenic tumor
D. All of the above - A 4 year old child with one tooth less than the normal dentition shows large tooth with two crowns and two root canals, the anamoly is______________?
A. Dilaceration
B. Fusion
C. Gemination
D. Concrescence - An asymptomatic tooth has deep has deep caries on occlusal surface. Radiograph shows radiopaque mass at apex of the tooth: this mass is most likely to be:____________?
A. Cementoma
B. Condensing Osteitis
C. Chronic apical periodontitis
D. Acute apical periodontitis
