MCQs on Oral Pre-cancer and Oral Cancer - Oral Medicine and Radiology

# The current “gold standard” for predicting the malignant potential of the precancerous lesions is the:
A. presence & degree of dysplasia
B. presence of candidal hyphae
C. presence of red areas in the lesion
D. site of the lesions

# Which of the following viruses is not an oncovirus?
A. Herpes Simplex Virus
B. Human Papilloma Virus
C. Varicella zoster Virus
D. Epstein Barr Virus

# Which type of inflammatory cells predominate in the infiltrate of invasive carcinoma?
A. Monocyte
B. T lymphocyte
C. CD 8 lymphocyte
D. Langerhan's cell

# The fixation of lymph nodes to adjacent tissues in cases of malignancy is due to:
A. Secondary infection
B. protective mechanism of body
C. invasion of malignant cells through capsule
D. matting of lymph nodes

# Which of the following is not a Tumor suppressor gene?
A. p53
B. p161NK4A
C. bcl – 2
D. FHIT (fragile histidine triad)

# A tumor classified as T1 N2 M0 belongs to which stage?
A. Stage 1
B. Stage 2
C. Stage 3
D. Stage 4

# Which is the preferred method of biopsy in case of a malignant involvement of lymph node?
A. Fine needle aspiration
B. Incisional biopsy
C. Excisional biopsy
D. No biopsy

# Leukoplakia in which of the following sites poses high risk comparatively?
A. Gingiva
B. Buccal mucosa
C. Floor of the mouth
D. Palate

# Which of the following statements is true regarding the effects of hyperfractionation of radiation therapy?
A. Chronic complications are more
B. Acute complications are more
C. Acute complications are more & chronic complications are less
D. Both, acute & chronic complications are less

# Which of the following tumors are highly sensitive to radiation therapy?
A. Well differentiated squamous cell carcinoma
B. Malignant lesion with bone invasion
C. Mucosal lesions
D. Lesions with extensive node involvement

# Which of the statements given below is true?
A. Leukoplakia in nonsmokers has a greater risk for malignant transformation than leukoplakia of smokers
B. Alcohol consumption alone can be associated with an increased risk of developing leukoplakia
C. Invasion of dysplastic epithelial cells is seen in basement membrane zone in Carcinoma in situ
D. Verrucous leukoplakia is usually seen in older adults


# Which of the following investigative procedures is gold standard for achieving the diagnosis in case of a oral leukoplakia?
A. Toluidine blue staining
B. Brush biopsy
C. Cytosmear
D. Biopsy

# Choose the correct sequence. The risk of malignant conversion of oral leukoplakias in decreasing order is:
A. Homogenous – verrucous – speckled
B. Verrucous – homogenous – speckled
C. Speckled – homogenous – verrucous
D. Speckled – verrucous – homogenous

# Bowen?s disease mimics which of the following lesions
A. Erythroplakia
B. Leukoplakia
C. Verrucous carcinoma
D. Traumatic keratosis

# Erythroplakic lesion of oral cavity mimics all of the following lesions except:
A. Denture stomatitis
B. Vascular lesion
C. Syphilitic patch
D. Inflammatory lesion

# Which of the following diseases has the highest malignant transformation rate?
A. Leukoplakia
B. Erythroplakia
C. Oral Lichen planus
D. Oral submucous fibrosis

# Widely accepted etiological factor in case of oral submucous fibrosis is:
A. Areca Nut
B. Tobacco
C. Chillies
D. Vitamin deficiency

# Which of the following is not a premalignant condition?
A. Oral lichen planus
B. Oral submucous fibrosis
C. Xeroderma pigmentosum
D. Cheilitis granulomatosa

# Exposure to ultraviolet rays, particularly from sun light causes all of the following lesions except:
A. Basal cell carcinoma
B. Actinic keratosis
C. Adenoid cystoc carcinoma
D. Malignant melanoma

# Which of the following is an antioxidant that is used in the chemoprevention of oral cancer?
A. Iron
B. Bleomycin
C. Methotrexate
D. Selenium

# Which stage of syphilis is a pre-disposing condition to oral cancer?
A. Primary stage
B. Secondary stage
C. Tertiary stage
D. Syphilis is not a predisposing condition to oral cancer

# Malignant transformation rate of oral leukoplakia globally is:
A. 18 - 20 %
B. 3 - 6 %
C. 0 - 1 %
D. 0.5 - 0.1 %

# Presence of multiple pre-malignant lesions in oral cavity is aptly called as:
A. Premalignant condition
B. Field cancerization
C. Immunocompromised
D. Premalignant syndrome

# “Ebbing tide type” leukoplakias are described in which part of oral cavity?
A. Buccal Mucosa
B. Gingiva
C. Vestibule
D. Floor of mouth

# “Eliptical rima Oris” is a clinical feature of:
A. Oral Submucous fibrosis
B. Oral lichen planus
C. Oral cancer
D. Oral erythroplakia

# Spindle cell carcinoma is also known as Carcino-sarcoma because:
A. it is a combination of carcinoma & sarcoma
B. Sarcoma occurs in a carcinomatous tissue later
C. presence of Spindle shaped cells gives false appearance of sarcoma
D. it is a lesion which can metastasize in both blood & lymphatics

# In vital staining technique using toluidine blue for detection of oral precancer & cancer __________ acid is used.
A. 4% hydrochloric acid
B. 1% Sulphuric acid
C. 1% Acetic acid
D. 10% Formic acid

# Which of the following variety of oral cancer has slow growth & rarely metastasizes?
A. Verrucous carcinoma
B. Melanocarcinoma
C. Adenocarcinoma
D. Carcinosarcoma

# Which are the two more parameters that were later added to TNM system of staging?
A. Age and sex
B. Age and Site
C. Site and pathology
D. Sex and pathology

# One of the following clinical features is not seen in Oral sub mucous fibrosis:
A. Xerostomia
B. Pain in ear
C. Excessive salivation
D. Enlarged uvula

# “Ribbon like” epithelium is seen in which of the following diseases histopathologically?
A. Oral Lichen planus
B. Oral Submucous Fibrosis
C. Verrucous carcinoma
D. Leukoplakia

# Deficiency of which vitamin can induce metaplasia & keratinisation of certain epithelial structures leading to oral leukoplakias?
A. Vit. A
B. Vit. C
C. Vit. D
D. Vit. K

# Muscle degeneration is seen which of the following precancerous conditions?
A. Lichen planus
B. Oral submucous fibrosis
C. Discoid Lupus erythematosus
D. Xerostomia pigmentosum

# In radiation therapy, deep seated lesions are usually irradiated with:
A. X ray photon
B. Electron
C. Neutron
D. Proton

# Radioisotopes are used in which of the following treatment procedures of cancer?
A. Teletherapy
B. Chemotherapy
C. Brachytherapy
D. Immunotherapy

# Most of the ____________ carcinomas of oro-facial region spread by local infiltration, or perineural invasion or hematogenous spread and less commonly through lymphatics.
A. Melano
B. Adeno
C. Basal
D. Neuro

# Which of the following adeno-carcinomas have a capsule?
A. Acinic cell carcinoma
B. Clear cell carcinoma
C. Adenoid cystic carcinoma
D. Mucoepidermoid carcinoma

# Which of the following malignancies has the highest incidence of metastasizing to jaws?
A. Thyroid
B. Breast
C. Prostate
D. Renal

# Intra epithelial carcinoma is a:
A. Pre-cancerous lesion
B. Squamous cell carcinoma
C. Lesion which can metastasize to different epithelia
D. Aggressive lesion

# Chemotherapy is used to treat oral malignancies in:
A. order to cure the lesion completely
B. advanced disease & recurrent tumors
C. order to control primary tumor
D. adjuvant with immunotherapy

Oral Medicine and Radiology MCQs - Acute and Chronic infections of the Jaw

# Cotton Wool appearance on a radiograph may be indicative of:
A. Acute suppurative osteomyelitis
B. Chronic suppurative osteomyelitis
C. Diffuse sclerosing osteomyelitis
D. Proliferative periostitis

# Lues maligna is a form of:
A. Severe malignant melanoma
B. Lyell's disease
C. Secondary syphilis
D. Hansen's disease

SYNOPSIS - INTRODUCTION TO ORTHODONTICS

Orthodontics (Greek. orthos = correct; odontos = teeth) is that branch of dentistry concerned with prevention, interception and correction of malocclusion and other abnormalities of the dento-facial region. The term 'Orthodontics' was first coined by le Felon.

Interesting / most difficult / most frightening / most challenging / unforgettable/ potentially fatal

Every dentist examines a number of  patients each day and gains more and more the clinical skills required for diagnosis and gains insight to distinguish between the conditions that appear very similar to each other clinically and are confusing to a neophyte in the field of dentistry.

You must have heard the saying "The eyes only see what the head knows" as a student which is true indeed. A good knowledge of the condition, its manifestations, signs and symptoms are vital to make a differential diagnosis pointing towards the correct direction. Even the general public these days believe that  older the doctor, the lesser the lab investigations he needs and demands before making a diagnosis. What are your opinions about that ?

Please Share your interesting / most difficult / most frightening / most challenging / unforgettable/ potentially fatal cases you've managed so far and share your feelings during the procedure, after completing it, and the lessons you learnt. You can share as many as you like. Have a nice time. Thank You !!!

Types of Dentitions

TYPES OF DENTITIONS

Monophyodont	Presence of only one set of dentition for entire life.
Diphyodont	• Presence of two sets of dentition  • Human beings are diphyodonts
Polyphyodont	Presence of more than two sets of dentition.
Homodont	All the teeth have same shape without distinction such as incisors, canines, premolars and molars.
Heterodont	Presence of different groups of teeth.
Bunodont	• Primitive type of teeth seen in primates like cats, dogs, etc.  • Contains simple conical cusps.
Haplodont	• Seen in reptiles like crocodiles.  • Simplest cone form of teeth with single root. • Only simple hinge movements of jaws are seen.
Triconodont	• Seen in early mammals.  • Three cusps are arranged in line with the largest cusp in the center.
Tritubercular stage	• Three cusps are arranged in triangle form.
Quadritubercular stage	• 4th cusp is formed and an occlusal contact relationship between the upper and lower  jaws is established.

Except molars, all the permanent teeth (incisors, canines and premolars) are known as succedaneous teeth because they take the place of their primary predecessors.

MCQs in Fixed Partial Dentures - Principles of Tooth Preparation

# The average root surface area of maxillary first molar is (in mm2):
A. 133
B. 233
C. 333
D. 433

# The average root surface area (mm2) of the maxillary second premolar is:
A. 234
B. 220
C. 273
D. 204