INBDE Fields of Dentistry UPDATED Exam Questions and CORRECT Answers

INBDE Fields of Dentistry UPDATED Exam
Questions and CORRECT Answers
critical pH of enamel - CORRECT ANSWER - 5.5



critical pH of enamel with fluoride - CORRECT ANSWER - 4.5



critical pH of dentin - CORRECT ANSWER - 6.2-6.7



3 ways fluoride prevents tooth decay - CORRECT ANSWER - 1. remineralization of tooth
structure
2. decrease enamel solubility
3. interfere with metabolic activity of cariogenic bacteria


4 main factors required for caries development, Keyes-Jordan diagram - CORRECT
ANSWER - plaque, sugar, host, time



Pit and fissure lesions are what shape? - CORRECT ANSWER - inverted V shape



Smooth surface lesions are what shape? - CORRECT ANSWER - V shape



infected dentin - CORRECT ANSWER - superficial, wet, soft, mushy, necrotic



affected dentin - CORRECT ANSWER - deeper, dry, leathery, demineralized but not
invaded by bacteria


order of cavity formation - CORRECT ANSWER - enamel demineralization -->
dentin demineralization -->

,enamel cavitation -->
dentin cavitation


simple caries - CORRECT ANSWER - 1 surface (O)



compound caries - CORRECT ANSWER - 2 surfaces (MO, DO, etc.)



complex caries - CORRECT ANSWER - 3+ surfaces (MOD, MODBL, etc.)



bacteria in enamel caries - CORRECT ANSWER - Streptococcus mutans



bacteria in dentin caries - CORRECT ANSWER - Lactobacillus



bacteria in root caries - CORRECT ANSWER - Actinomyces



4 cariogenic factors of S. mutans - CORRECT ANSWER - 1. glucotransferase (GTF) =
create extracellular polysaccharide matrix
2. acidogenic
3. aciduric
4. bacteriocins = kill competing microbes


protective factors in saliva - CORRECT ANSWER - 1. buffers
2. glycoproteins
3. lysozymes
4. lactoferrin
5. lactoperoxidase
6. sIgA
7. ions to promote remineralization (Ca2+, PO4-, F-)

,8. proline-rich proteins to promote remineralization (statherin, cystatin, histatin)


What is the gold standard radiograph for caries detection on anterior teeth? - CORRECT
ANSWER - PA


What is the gold standard radiograph for caries detection on posterior teeth? - CORRECT
ANSWER - bitewing


Amalgam restoration should be replaced if it has ____mm marginal ditching. - CORRECT
ANSWER - >0.5mm



erosion - CORRECT ANSWER - caused by acidic foods or gastric acid



abrasion - CORRECT ANSWER - loss of tooth structure by non-tooth mechanical wear
e.g. toothbrush or porcelain


attrition - CORRECT ANSWER - occlusal wear with opposing natural teeth



abfraction - CORRECT ANSWER - loss of tooth surface in cervical area due to tooth
flexure


# blades for cutting on carbide burs - CORRECT ANSWER -6



# blades for finishing on carbide burs - CORRECT ANSWER - 12



# blades for ultra fine finishing on carbide burs - CORRECT ANSWER - 30



dimensions of 330 bur - CORRECT ANSWER - pear-shaped

, 1.5mm length
0.8mm width at tip


dimensions of 245 bur - CORRECT ANSWER - pear-shaped
3mm length
0.8mm width at tip


initial depth of cavity prep should extend ____mm into dentin - CORRECT ANSWER -
0.2mm


extend walls of box prep to achieve ____mm clearance - CORRECT ANSWER - 0.5mm



friable enamel - CORRECT ANSWER - demineralized, needs to be removed because
bonding agent is not as effective


primary retention features of cavity prep - CORRECT ANSWER - convergent walls,
dovetail, bond


secondary retention features of cavity prep - CORRECT ANSWER - grooves, slots, pins



minimum thickness for amalgam - CORRECT ANSWER - 1.5-2mm



liner material - CORRECT ANSWER - CaOH (Dycal)



base material - CORRECT ANSWER - RMGI (Vitrebond)



secondary retention form for gold onlays - CORRECT ANSWER - collar (beveled
shoulder around capped cusp)
skirt (feather-edge margin around capped cusp)