CIT Equipment Operation & Maintenance 2 — Questions and Answers
Question 1: What is the primary purpose of a torque-limiting handpiece in implant surgery?
- To increase rotational speed during osteotomy
- To prevent exceeding the maximum insertion torque for implants (Correct answer)
- To reduce vibration transmitted to surrounding bone
- To control irrigation flow during drilling
Correct answer: To prevent exceeding the maximum insertion torque for implants
Torque-limiting handpieces are designed to disengage or slip when a preset torque value is reached, protecting implants from being overtightened during placement.
Question 2: Which type of bur is most appropriate for the initial cortical bone penetration during implant site preparation?
- Round carbide bur
- Tapered diamond bur
- Twist drill (pilot drill) (Correct answer)
- Bone spreader
Correct answer: Twist drill (pilot drill)
A pilot (twist) drill is used for initial cortical penetration to establish the osteotomy direction and depth before sequential enlargement drills are used.
Question 3: At what minimum irrigation flow rate is saline typically recommended during implant osteotomy preparation to prevent bone overheating?
- 5 mL/min
- 15 mL/min
- 50 mL/min (Correct answer)
- 100 mL/min
Correct answer: 50 mL/min
A minimum of 50 mL/min of sterile saline irrigation is generally recommended during osteotomy preparation to keep bone temperature below 47°C and prevent thermal necrosis.
Question 4: When sterilizing a piezoelectric surgical unit's handpiece, which method is contraindicated?
- Steam autoclave (134°C)
- Chemical vapor sterilization
- Ethylene oxide (ETO)
- Dry heat oven at 160°C (Correct answer)
Correct answer: Dry heat oven at 160°C
Dry heat at 160°C can damage the piezoelectric crystals and plastic components within the handpiece; autoclave or ETO are manufacturer-approved methods.
Question 5: How often should implant motor handpiece bearings be lubricated per manufacturer standard protocols?
- After every patient
- Weekly regardless of use
- Before every sterilization cycle (Correct answer)
- Monthly if used daily
Correct answer: Before every sterilization cycle
Handpiece bearings should be lubricated before each autoclave cycle because the sterilization process removes lubricating oils and can cause bearing damage if the instrument is run dry.
Question 6: A surgical implant motor displaying an 'E3' error code most commonly indicates:
- Low battery voltage
- Motor overload or stall condition (Correct answer)
- Handpiece coupling fault
- Temperature sensor failure
Correct answer: Motor overload or stall condition
An overload/stall error (commonly coded E3 or similar) occurs when the motor is forced against excessive resistance, such as a dull drill or unexpectedly dense bone.
Question 7: Which OSHA standard governs the disposal of contaminated single-use implant drills?
- 29 CFR 1910.134 (Respiratory Protection)
- 29 CFR 1910.1030 (Bloodborne Pathogens) (Correct answer)
- 21 CFR Part 820 (Quality System Regulation)
- 29 CFR 1910.147 (Lockout/Tagout)
Correct answer: 29 CFR 1910.1030 (Bloodborne Pathogens)
OSHA's Bloodborne Pathogens Standard (29 CFR 1910.1030) requires that contaminated sharps, including single-use drills, be discarded in puncture-resistant sharps containers.
CIT Equipment Operation & Maintenance 2
What is the primary purpose of a torque-limiting handpiece in implant surgery?