Midterm 1: Operator positions and fissure sealants Flashcards
How should your chair be tilted?
Upwards to the floor
What is proper patient positioning for the maxillary arch?
Chair positioned horizontal to the floor
Maxillary arch perpendicular to the floor
Patient’s head turned to right or left
What is the supine patient position?
Parallel with the floor
What is the semi-supine patient position?
Torso is slightly lifted to form a 45 degree angle with the floor
What is proper patient position for the mandibular arch?
Chair tilted supwards so mandible is tilted 5-30 degrees from the floor (semi-supine)
patient’s head is turned to right or left
Head of the handpiece should be ____________ to the occlusal surface of the tooth being prepared
parallel
All preparations should be accomplished using:
- proper chair position
- handpiece grasp
- bur angulation
What is one of the most effect caries prevention modalities?
pit/fissure sealants
What is the purpose of pit and fissure sealants?
to provide hermetic seal of pits and fissures that harbor cariogenic bacteria
Pit and fissure sealants are for which teeth?
PERMANENT first and second molars
premolars
What do sealants do to the tooth?
create a smooth occlusal surface that removes the food source of bacteria
What is the purpose of etchant?
To create a rough surface for the sealant to adhere to
What are curing lights used for?
polymerization of light cured resin based composites
What light and wavelength do we use?
blue light
400-500 nm
under visible light spectrum
What is irradiance?
Intensity of the light hitting the surface measured in mw/cm2
<300 = low output
300-500 = test composite to determin curing times
500-800 = recommended curing time
>800 = high output
What is energy?
total energy emitted over curing time, measured in J/cm2
Irradiance x Time
What is the recommended energy for curing 2mm of conventional resin composite?
16 J/cm2
Radiometers are recommended to be used ______ to measure the irradiance and a log should be maintained.
weekly
What should you check during maintenance?
Bulbs
Filters
Debris on light tips
Sterilization and curing tips
Voltage
What is the curing distance?
1 mm from the light source to the composite
as close as you can get
90 degrees to the surface of the composite
What should you do if there is a high occlusion due to overfilling?
Adjust with football carbide composite finishing bur
