Golden Questions 3 Flashcards
Which of the following are true regarding the general objective of orthodontic treatment?
Extractions must be avoided for ideal occlusion
Facial esthetics must be ideal in ideal occlusion
Ideal occlusion can be compromised to gain acceptable esthetics and stability
Ideal occlusion must be obtained
Ideal occlusion can be compromised to gain acceptable esthetics and stability
A patient presents to your office with substantial bone loss and a history of periodontal disease. Currently, there is no active periodontal disease. The patient wants orthodontic therapy. Which of the following is true regarding orthodontic treatment in this case?
A history of periodontal disease is a contraindication to treatment
A history of 20% horizontal bone loss is a contraindication to treatment
Careful treatment will not lead to further bone loss and does not contraindicate treatment
Active periodontal disease is not a contraindication to initiating treatment
Careful treatment will not lead to further bone loss and does not contraindicate treatment
Which of these are the main mechanisms in differentiating of periodontal ligament fibroblasts?
Calcitonin and chemical pathways
Central Nervous System and Autonomic Nervous System
Mechanical strain and albumin
Mechanical strain and Calcitonin
Mechanical Strain and Calcitonin
What is the duration of light pressure required to initiate increased levels of cyclic adenosine monophosphate (cAMP) in the periodontal ligament?
2 seconds
4 seconds
2 hours
4 hours
4 hours
Which of these, from the text and lecture, refers to the advantage that can be obtained by pitting bodily movement of one group of teeth against tipping of another?
Cortical anchorage
Reinforced anchorage
Skeletal anchorage
Stationary anchorage
Stationary Anchorage
Which of these is not a typical side effect of orthodontic treatment?
Class III mobility
Collagen fiber detachment from bone and cementum
Mild pulpitis
Widening of the PDL space
Class III Mobility
What material has the same stiffness and module of elasticity as stainless steel?
A-NiTi
Beta-titanium
Cobalt-chromium (heat-treated)
Gold (heat-treated)
Cobalt-chromium (heat-treated)
Which of the these orthodontic archwire materials exhibit the most springback?
A-NiTi
Heat treated NiTi
M-NiTi
Stainless steel
A-Niti
Which of these bends aid in mesiodistal root positioning relative to the long-axis of the tooth?
Zero-order
First-order
Second-order
Third-order
Second-order
What is the most widely used type of bonding material for bonding attachments?
Chemically activated resins
Light-activated composite resins
Self-curing resins
Light-activated composite resins
How long will elastomeric separators typically remain prior to banding?
1-2 days
3-4 days
1-2 weeks
3-4 weeks
1-2 weeks
Which of the following is the first step in banding?
Cement
Fit
Separate
Seat
Seperate
If using a largely glass ionomer material in orthodontic bonding, which of these is helpful in the deproteinization of the enamel?
NaCl
NaOCl
HCl
NaOCl
What type of cement is used for application of orthodontic bands?
Glass-Ionomer
Luting Cement
Resin modified glass ionomer
Zinc Phosphate
Resin modified glass ionomer
Which of these removes a small amount of softer interprismatic enamel and opens pores between the enamel prisms?
37% unbuffered phosphoric acid
37% buffered phosphoric acid
37% unbuffered NaOCl
37% buffered NaOCl
37% unbuffered phosphoric acid
What new cement is more readily used in orthodontics?
Composite glass ionomer resin
Resin cement
Zinc phosphate
Zinc polycarboxylate
Composite glass ionomer resin
What is one approach to prevent condensation on mirror surfaces for intra-oral photography?
Pre-soak in cold water before use
Pre-soak in warm water before use
Store in refrigerator before use
Store at room temperature before use
Pre-soak in warm water before use
What is the most convenient and versatile camera for dental applications?
Digital single lens reflex (DSLR) camera
Intra-oral camera
Polaroid print camera
Smartphone camera
DSLR
While NiTi archwires have a force-delivering range of several millimeters, what is the average range for plastic aligners?
0.1 mm
0.2 mm
0.3 mm
0.4 mm
0.2 mm
According to the text, which of these is not indicated with clear aligner therapy?
Distally tipped molars
High canines
Intrusion of incisors
Posterior dental expansion
High Canines
According to the text, which of these works well with clear aligner therapy?
High canines
Prolonged treatment in children
Posterior dental expansion
Severe crowding
Posterior dental expansion
What is the most common thickness of thermoplastic polymers used for clear aligners?
0.1-0.2 mm
0.2-0.3 mm
0.3-0.4 mm
0.4-0.5 mm
0.4-0.5 mm
What is the first step in the production of a series of aligners using Invisalign?
Creating a set of digital models to be transferred to a cast production facility
Sending aligners directly to the doctor’s office for initial insertion
Submitting a 3-dimensional image of the patient’s dentition
Submitting a dental cast of the patient’s dentition
Submitting a 3-dimensional image of the patient’s dentition
Which one is NOT a plastic material used to fabricate clear aligners?
Polyethylene
Polypropylene
Polystyrene
Polyurethane
Polystyrene
Who is the one person responsible for making sure the aligner treatment plan is best for the patient?
The computer software
The company representative or technician
The doctors employed by the company
The dentist who is treats the patient
The dentist who is treats the patient
Acuitence
The Objective measure of Sharpness/Visual acuity
* physical measurement of sharpness
* use denitometers
* no influenced by subjective
Psychological perception
Varies from individual to individual and intra-individual
An individual:
* will see what his/her brain wants to perceive
* may perceive the same image differenty at different times depending on state of mind
Pixels
number of pixels determines the size of an image
* Not Image quality
significant when enlarging an image or part of an image
* requires more pixels to avoid deterioration of image quality
Lens characteristics for high quality image
Resolution:
* High contrast for HIGHER resolution
Superior Optical quality:
* minimize chromatic and sperical distorations
APO Lens=apochromatic
ASPH Lens=Aspherical
APO lens
Apochromatic Lens-low chramatic aberrations
* use 3 lens to focus red, green and blue light
