Question: The attachment of the Actinomyces species to the tooth surface is facilitated by____________?

• 1. Fimbriae
• 2. Cilia
• 3. Flagella
• 4. Pseudopodia

Question: Which of the following factors in the stephan’s curve is related to the caries incidence and sugar intake______________?

• 1. Physical form of sugar
• 2. Frequency of sugar intake
• 3. Ph of Plaque
• 4. Quantity of sugar intake

Question: Cavity formation in a tooth, due to dental caries is due to______________?

• 1. Destructive potential of streptococcus mutans
• 2. Destructive potential of lactobacillus acidophilus
• 3. Lateral spread of caries along DE junction and weakening of the outer covering enamel
• 4. Mastectomy force and unrelated to the extent of carious process

Question: The most pronounced effect on the oral microflora of a reduction in rate of salivary flow is a_____________?

• 1. Significant increase in number of oral bacteria
• 2. Shift towards more acidogenic microflora
• 3. Significant decrease in number of oral bacteria
• 4. Shift towards more aerobic microflora

Question: Which of the following organisms is found in deep carious lesions rather than in incipient lesions ?

• 1. Streptococci
• 2. Lactobacilli
• 3. Veillonella
• 4. Bateroides

Question: Early invading bacteria in carious lesions are called___________?

• 1. Microcosm
• 2. Pioneer bacteria
• 3. Advancing bacteria
• 4. Anaerobic bacteria

Question: The prbable reasons for a high incidence of dental caries in the teenage population relates most directly to______________?

• 1. Rapid growth
• 2. Frequency of sucrose intake
• 3. Negligence in visiting the dentist
• 4. Carelessness in oral hygiene habits

Question: The enzyme glucosyl transferase secreted by Streptococcus mutans sythesizes glucans from_____________?

• 1. Glucose
• 2. Fructose
• 3. Sucrose
• 4. Lactose

Question: For a bacterium to be seriously considered in the etiology of dental caries, it must______________?

• 1. Exist regularly in the dental plaque
• 2. Produce extracellular amylopectins
• 3. Be lethal for gnotobiotic animals
• 4. Produce intracellular dextrans

Question: Streptococcus mutans is considered to be principle etiologic agent of caries because it produces organic acids and it ________________?

• 1. Forms a gelatinous matrix
• 2. Metabolizes substrate from saliva
• 3. Derives energy from enamel constituents
• 4. Lives symbiolically with lactobacillus