Skip to main content

Cleft Palate occurs during which week of gestation?

# Cleft palate occurs in the ___________ of embryonic life.
A. First to third week
B. Fourth to sixth week
C. Eighth to tenth week
D. Twelfth to fourteenth week


The correct answer is C. 8th to 10th week.

Cleft palate occurs in the eighth to tenth week of embryonic life. Isolated clefts of the palate are more common in females. It is characterized by a fissure in the midline of the palate, resulting from the failure of the two sides to fuse during embryonic development.

The most severe handicap imposed by cleft palate is an impaired mechanism preventing normal speech and swallowing. 

Note: It affects approximately 1 in 2000 births.

Cleft lip results when the medial nasal process fails to fuse with the lateral portions of the maxillary process of the first branchial arch. Fusion normally occurs during the sixth and seventh weeks of embryonic development. The maxillary lip is most commonly affected.

It may be bilateral (20%) or unilateral (80%). Clefts of the lip are more frequent in males. Lip cleft involvement is more frequent on the left side than the right.

Note: It affects approximately 1 in 1000 births, but varies with race.

Comments

Post a Comment

Add Your Comments or Feedback Here

Popular Posts

Dental MCQs - Multiple Choice Questions in Dentistry

SELECT THE TOPIC YOU WANT TO PRACTICE. # LOK SEWA  AAYOG PAST QUESTIONS Medical Entrance Preparation MCQs # Digestive System and Nutrition MCQs # Reproductive System MCQs # MCQs on Sense Organs # Nervous System MCQs # Cardiovascular System MCQs # Endocrine System MCQs # Assorted Dental MCQs - Part 1 #AIIMS MDS ENTRANCE EXAM YEARWISE COLLECTION *** AIIMS Nov 2001 *** AIIMS Nov 2002 *** AIIMS Nov 2003 *** AIIMS Nov 2004 *** AIIMS Nov 2005 *** AIIMS Nov 2006 *** AIIMS Nov 2007 Part 1 *** AIIMS Nov 2007 Part 2 *** AIIMS Nov 2008  *** AIIMS Nov 2009 *** AIIMS Nov 2010 *** AIIMS Nov 2012 *** AIIMS Nov 2013 *** AIIMS Nov 2014 *** AIIMS Nov 2015 *** AIIMS May 2016 *** AIIMS May 2015 *** AIIMS May 2014 *** AIIMS May 2013 *** AIIMS May 2012 *** AIIMS May 2011 # DENTAL MATERIALS *** Amalgams *** Physical Properties *** Metallurgy *** Impression Materials *** Dental Ceramics and Miscellaneous *** Gypsum Products *** Dental Cements *** Restorative Resin...
Continue Reading....>>

Most Important Operative Dentistry MCQs With Explanations

1. The following chemically bond to the tooth: A. Composite resin. B. Dental sealants. C. Glass ionomer cement. *** D. All of the above. 2. Compomer restorative materials are: A. Glass ionomer with polymer components B. Resin systems with fluoride containing glasses. *** C. Composite resin for cervical restorations only. Explanation: The composition of compomers is similar to that of a dental composite however it has been modified, making it a polyacid-modified composite. This results in compomers still requiring a bonding system to bond to tooth tissue. Although the name compomer implies that the material possesses a combination of characteristics of both composite and glass ionomers, these materials are essentially polymer-based composites that have been slightly modified to take advantages of the potential fluoride-releasing behavior of glass ionomers. 3. Loose enamel rods at the gingival floor of a class II amalgam cavity should be removed using : A. Straight chisel...
10 comments
Continue Reading....>>

MCQs in Endodontics - Disinfection and Obturation

# Obturation of a root canal should achieve: A. Tug back B. Hermetic seal C. Fluid free seal D. All of the above # The purpose of a root canal sealer is to: A. seal the tubules of the dentine B. stimulate healing in periapical region C. prevent discoloration D. fill the space between solid core material and pulp canal walls
Continue Reading....>>

MCQs every Dentists should Know - MEDICALLY COMPROMISED DENTAL PATIENTS - DENTAL CONSIDERATIONS

# Macrolide antibiotics are usually avoided in asthmatics because: A. it can precipitate asthmatic attack B. it interacts with theophylline C. such patients are usually allergic to penicillins D. such patients show penicillin resistant infections # Anticoagulation therapy should be advised to discontinue before minor or major oral surgical procedures if: A. INR (international normalized ratio) is less than 3.0 B. INR is more than 3.0 C. PT (Prothrombin time) is less than 10 seconds D. PT is in range of 10-15 seconds # Which of the following oral manifestations can be often seen in asthmatics? A. Xerostomia B. Geographic tongue C. Enamel hypoplasia D. Aphthous ulcers # A male patient of 76 yrs is on warfarin therapy and needs emergency extractions of a decayed tooth. Select the appropriate protocol given below. A. Do not stop the warfarin therapy – perform the surgery with local hemostatic agents - a...
Post a Comment
Continue Reading....>>

MCQs in Endodontics - Diseases of the Pulp and Periradicular Tissues

# The treatment of acute periapical abscess is: A. Endodontic therapy or extraction B. Incision and drainage only C. Pulp capping D. None of the above # Internal resorption in a tooth is seen as: A. Ca(OH)2 pulpotomy B. Replacement resorption C. Non-proliferating lesion D. Desensitizing tooth # The initial pulpal response to any insult is: A. Necrosis B. Ulceration C. Calcification D. Inflammation # Patient reports with severe throbbing pain in relation to mandibular second molar. The tooth is sensitive to both hot and cold food and elicits a painful response on percussion. What would be your treatment of choice? A. Incision and drainage of periapical area B. Endodontic therapy C. Indirect pulp capping D. Partial pulpectomy # The most important aspect of emergency treatment for an acute apical abscess is to: A. Produce sedation B. Obturation C. Establish drainage ...
Continue Reading....>>