Pathways of the Pulp Flashcards
Fluid movement within dentinal tubules can stimulate sharp, quickly reversible dental pain. What nerve fibers are responsible for this sensation?
Chapter 1: Diagnosis
A-delta nerve fibers
What nerve fibers produce an intense, slow, dull pain that can manifest as referred pain?
Chapter 1: Diagnosis
pulpal C fibers
What is the definition of spatial resolution?
Chapter 2: Radiographic Interpretation
the ability to display two objects that are close to each other as two separate entities
What is the definition of contrast resolution?
Chapter 2: Radiographic Interpretation
The ability to differentiate between areas on the image based on density
Endodontics require high-contrast resolution
What are the advantages of CBCT over multidector CT?
Chapter 2: Radiographic Interpretation
Faster, low-dose, low-cost, high-contrast images
High resolution isotropic images
What is a voxel?
Chapter 2: Radiographic Interpretation
cuboidal elements that constitute a 3D volume unlike pixels which are 2D
MDCT obtain pixels while CBCT obtains voxels
Does CBCT have lower or higher kV and mA exposure parameters than MDCT?
Chapter 2: Radiographic Interpretation
Lower
True or false: the smaller the voxel size the higher the spatial resolution
Chapter 2: Radiographic Interpretation
True
What is the maximum voxel size that should be used for endodontic imaging?
Chapter 2: Radiographic Interpretation
0.2mm
What percent mineral content loss is needed for radiolucent regions to be visualized on conventional radiographs?
Chapter 2: Radiographic Interpretation
30-40%
Planar based radiographs overestimate or underestimate success of endodontic treatment as compared to CBCT?
Chapter 2: Radiographic Interpretation
Overestimate success of endodontic treatment
What three characteristics must be present for a diagnosis of Medication Related Osteonecrosis of the Jaws (MRONJ)? (American
Association of Oral and Maxillofacial Surgeons: Position paper
on Bisphosphonate-Related Osteonecrosis of the Jaw)
Chapter 3: Case Selection and Treatment Planning
- Current or previous treatment with an antiresorptive drug
such as a bisphosphonate or an antiangiogenic drug (e.g.,
sunitinib [Sutent], sorafenib [Nexavar], bevacizumab
(Avastin), or sirolimus (Rapamune) - Exposed, necrotic bone in the maxillofacial region that has
persisted for more than 8 weeks - No history of radiation therapy to the jaws
What factors increase the risk of developing osteonecrosis of the jaw while recieving bisphosphanotes?
Chapter 3: Case Selection and Treatment Planning
history of taking bisphosphonates, especially intravenous (IV) formulations
previous history of cancer
history of a traumatic dental procedure
hx of chronic corticosteroid use
hx of diabetes
human only: hx of smoking, patient more than 65 years old
Which of the following is most correct regarding development of bisphosphonate-associated osteonecrosis?
A. The maxilla is more commonly affected than the mandible
B. 40% of cases are preceded by a dental procedure
C. patients with skeletal multiple myeloma and metastatic carcinoma recieving IV bisphosphonates comprise 94% of published MRONJ cases.
D. Patients less than 65 years old are at an increased risk
Chapter 3: Case Selection and Treatment Planning
C. patients with skeletal multiple myeloma and metastatic carcinoma recieving IV bisphosphonates comprise 94% of published MRONJ cases.
A. The mandible is more commonly affected than the maxilla (2:1 ratio)
B. 60% of cases are preceded by a dental procedure
D. Patients > 65 yro are at an increased risk
In what percent of cases are accessory canals found in the apical third of the root, the middle third and the cervical third?
Chapter 5: Tooth Morphology, Isolation and Access
Apical third 74%
Middle third 11%
Cervical third 15%
What is the definition of elastic limit in regards to endodontic instruments?
Ch 8
Maximal strain that allows a file to return to original dimensions
If you have a K file size #25 file with #.02 taper,
what mm distance is from D1 to D16 in the image, and what size in mm is the tip of the file?
What is the diameter at D16?
Distance: 0.32 mm
Tip: 0.25mm
Diameter: 0.57mm
What is the flute surface of an endodontic file?
Ch 8
Groove in the working surface that collects soft tissue and dentin from the walls, collects the dentin
What is the leading edge of an endodontic file?
What is the rake angle?
Leading edge: Surface with greatest diameter that follows the groove as it rotates – cuts the dentin
Rake angle: The angle formed by the leading edge and radius of file – Positive supposedly cuts; Negative supposedly scrapes
What is the helix angle of an endodontic file?
CH 8
The angle the cutting-edge forms with the long axis of file. Defines the type of file and how it is used
Define the order and direction of shaping the canal with each technique:
Step-back
Step-down
Crown-down
Ch 8
Step-back: Apical to coronal direction, taper canal
Step-down: Coronal pre-flaring before cleaning apically, WL before pre-flare
Crown-down: Coronal pre-flaring before cleaning apically, WL after pre-flare
What is the minimum concentration of NaOCl needed for pulp dissolution?
Ch 8
1 %
Which of the following properties of bleach leads to oxidizing pulpal tissue?
A. Saponification reaction
B. Neutralization reaction
C. Hypochlorous acid formation
D. Solvent action
Ch 8
C. Hypochlorous acid formation
Saponification reaction: Acts as an organic and fat solvent. Reduces the surface tension of the remaining solution.
Neutralization reaction: Neutralizes amino acids by forming water and salt. The pH is reduced.
Hypochlorous acid formation: Chlorine dissolves in water and it is in contact with organic matter: it forms hypochlorous acid. It is a weak acid that acts as an oxidizer.
Solvent action: Sodium hypochlorite also acts as a solvent, releasing chlorine that combines with protein amino groups (NH) to form chloramines (chloramination reaction). Chloramines impede cell metabolism and inhibits essential bacterial enzymes
What property of bleach makes it antimicrobial?
Ch8
High pH (>11)
The high pH interferes in cytoplasmic membrane integrity due to irreversible enzymatic inhibition, biosynthetic alterations in cellular metabolism, and phospholipid degradation observed in lipidic peroxidation.