NBDE operative dentistry Exam 2025 Questions and Answers

NBDE operative dentistry Exam
2025 Questions and Answers


bacteria adheres too tooth


plaque bacteria eat ____


metabolize sugars and make ____


acid lowers pH


critical pH reached ____ of tooth occurs - ANSWER✔✔-refined carbs


acid byproducts


demineralization


Cariogenic bacteria SALIVA - ANSWER✔✔-S. mutans, sanguis, mitis, salivarius


A. viscus


Lactobacilli


Veillonella

,A. naeslundi


most common bacteria in coronal caries - ANSWER✔✔-streptococcus mutans


lactobacilli


most common bacteria in root surface - ANSWER✔✔-actinomyces viscus


earliest found organisms - ANSWER✔✔-streptococcus sanguis


frank caries - ANSWER✔✔-progressed into dentinoenamel junction DEJ


bacteria in pit and fissure caries - ANSWER✔✔-S. sanguis


prevent pit and fissure caries - ANSWER✔✔-fissurotomy


sealant


TF slower progression of smooth surface caries bc less tubues are affected -

ANSWER✔✔-true


how do you prevent smooth surface caries - ANSWER✔✔-fluoride


zones of incipient lesion - ANSWER✔✔-translucnt zone


dark zone


body zone


surface zone

, translucent zone of incipient lesion - ANSWER✔✔-deepest zone


composition-less appearance under polarized light


dark zone of incipient lesion - ANSWER✔✔-remineralization


inabiilty to transmit polarized light


body zone of incipient lesion - ANSWER✔✔-largest zone


demineralizing phase


surface zone of incipient lesion - ANSWER✔✔-outermost zone


seems unaffected by caries


dentin contains less ____ and more ____ - ANSWER✔✔-mineralized tissue


tubular structures


which has more bacteria infected dentin or affected dentin - ANSWER✔✔-infected

dentin


demineralization can be reversed in infected or affected dentin - ANSWER✔✔-affected

dentin


zones of carious dentin - ANSWER✔✔-1. normal dentin


2. subtransparent


3. tranparent