Dentosphere : World of Dentistry

# Palatal root of maxillary first molar is curved: A. Mesially B. Buccally C. Lingually D. Distally The correct answer is B. Buccally. Palatal root of upper first molar is often curved buccally at apical third. It has the largest  diameter and offers easiest access of all the three roots. CLICK HERE FOR MORE MCQs  

# Root canal of maxillary first molar difficult for instrumentation is: A. Mesiobuccal B. Distobuccal C. Distolingual D. Mesiolingual The correct answer is A. Mesiobuccal. Mesiobuccal root has greatest distal curvature and is narrowest of all the three roots. It is flattened in mesiodistal direction. Sometimes, it contains a fourth canal.  CLICK HERE FOR MORE MCQs  

# In a cavity to be restored with GIC, it should be conditioned with: A. Water B. Polyacrylic acid C. Phosphoric acid D. Hydrochloric  acid The correct answer is: B. Polyacrylic acid. -Following completion of any cavity, there will be a smear layer left on the surface and floor. - To remove this smear layer, 10% polyacrylic acid is applied and allowed to remain in place for 10 seconds. CLICK HERE FOR MORE MCQs  

# Most  common cause of endodontic failures in maxillary first molar is: A. Missed fourth canal B. Vertical root fracture C. Periodontal involvement of pulpal lesion D. None of the above The correct answer is A. Missed fourth canal. - It's a standard to mention now that's maxillary first molar has fourth canal, the MB2 in 54% of cases. - The mandibular first molar is the tooth which needs RCT most commonly, but it's the maxillary first molar which has the most number of failed RCT. CLICK HERE FOR MORE MCQs   

# A pulp polyp is usually found in: A. Young teeth with chronic open pulpitis B. Young teeth with apical abscess C. Young teeth with acute pulpitis D. Young teeth with periapical infection Pulp polyp is a chronic hyperplastic open pulpitis found most commonly in deciduous molars and permanent first molar. It is highly vascularized. Complete endodontic treatment is to be provided if root formation is completed.  CLICK HERE FOR MORE MCQs   

# What is added to increase radiopacity in composites? A. Aluminium oxide B. Ferric chloride C. Boron oxide D. Calcium sulphate The correct answer is A. Aluminium Oxide. Filler composition in composites are often modified with other ions to produce desirable changes in properties. Barium, zinc, boron, zirconium, yttrium ions have been used to produce radiopacity in the filler particles. CLICK HERE FOR MORE MCQs

# Highest incidence of pulp necrosis is associated with? A. Class V Preparation on root surface B. Inlay preparation C. Partial veneer preparation D. Full crown preparation The correct answer is D. Full crown preparation. The most intense level of frictional heat is generated with a large diamond stone when teth are prepared for a full crown.  CLICK HERE FOR MORE MCQs