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23 Operative > 12 - Pins > Flashcards

12 - Pins Flashcards

1
Q

indications for retention

A

gross loss of tooth structure, widely extended prep, loss of cusps, large lesion/questionable prognosis, bases for C&B procedures

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2
Q

what are the types of pin systems

A
  1. cemented
  2. friction (not used anymore)
  3. self-threading (use in lab and clinic)
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3
Q

what pin:

Diameter of pin is less than that of the bur used to prepare the
channel
Retention of pins is proportional to the length of pin engaging the
dentin and strength of the cement

A

cemented pin

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4
Q

advantages and disadvantages of cemented pins

A

advantage: least trauma
disadvantage: requires a cementing medium, least retentive

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5
Q

retention for self-threading pins

A

rely on viscoelasataic property of dentin and the mechanical grasp of threads in dentin. pin hole is narrower than diameter of pin

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6
Q

advantage and disdvantage of self-threading pins

A

advantage: best retention of 3 systems, no cementing medium

disadvantange: potential for creation of internal stress that could crack tooth, especially true since pin size increases due to different in channel diameter and pin diameter

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7
Q

are pins measured in mm or inches

A

diameter measured in inches

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8
Q

what pin goes 2 mm into dentin and has 2 mm above the dentin

A

minim

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9
Q

what goes 1.5 mm into dentin

A

minikin pin kit

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10
Q

what goes 1.3 mm into dentin

A

minuta pin kit

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11
Q

retention increases as pin ___ increases

A

diameter

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12
Q

based on retentive demands, should you use the smaller or largest pin diameter possible

A

largest

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13
Q

based on tooth fracture potential, should you use smaller or largest pin possible

A

smallest

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14
Q

there is a significant increase in retention when pin is how many mm in dentin?

A

increases fromr 0-2 mm. there is not increase in retention if you make it longer than 2 mm

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15
Q

problems with smaller threaded pins

A

pink breakage or dislodgement

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16
Q

problems with larger threaded pins

A

cause dentin or restoration to fracture

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17
Q

thre parts to pink kit

A

pin, twist drill, means of insertion

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18
Q

what system used in clinic and lab

A

minim

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19
Q

what system is closest size to universal application (Anterior and posterior teeth) and can be easily adjusted, both in terms of length and angulation

A

minim system

20
Q
A

A= pin #1
B= shear point
C= pin #2
D= self limiting shoulder

21
Q

what to keep in mind when using twist drill

A
  1. keep sharp (15-20 placements, max)
  2. run twist drill at correct speed (slowspeed 3000-3500 rpm)
  3. maintain good bracing of handpiece
  4. do not repeatedly withdraw drill during channel prep
22
Q

what are the two areas of cavity preparation

A

area of pin placement
rest of the preparation (all caries removed and examin depth and place necessary bases and liners)

23
Q

is it okay to rely solely on pin retention

A

no

24
Q

create a flat surface or ledge that extends greater than ___ inside DEJ for pin placement

A

1mm

25
Q

factors to consider during pin placement

A

depth of channel, length of pin, location and orientation of channel, crazing of tooth structure, number of pins

26
Q

channel should be placed how many mm inside DEJ

A

1 mm

27
Q

is it more difficult to fully seat larger pins

A

yes

28
Q

in regular and minim system __mm of pin should be embedded within dentin and __mm exposed above to be embedded in restorative material

A

2,2

29
Q

how much SA needed over pin for strength

A

2 mm

30
Q

T/F: presence of pins INCREASES compressive strength of SA

A

false - decreases

31
Q

when cutting pins, what must dentist, assistant and pt have

A

eye protection

32
Q

do you make pilot hole for channels

A

yes with 1/2 round bur in high speed

33
Q

hold twist drill parallel to the what?

A

external tooth surface to get proper alignment

34
Q

what are the preferred locations for maxillary and mandibular pins

A
35
Q

considerations for pin placement in molars

A
  1. avoid placing pins in mandibular molar bifurcation
  2. avoid placing in maxillary molar trifurcation areas
  3. be careful when angulation determination when using secondary site
36
Q

what are frequent secondary sites that are difficult for pin placement

A

mid-lingual ofmaxillary molars and mid-distal of mandibular moalrs

use the roots of these teeth as a guide to orient pin channel preparation may cause channel to be mis-angled and penetrate the pulp

37
Q

pin placement in premolars

A
  • avoid mid-mesial surface of maxillary premolars
  • avoid mid distal surface of maxilary premolars
  • not a problem with mandibular premolars
38
Q

how many pins

A

usually 1 pin for each lost cusp

39
Q

what is the minimum distance between the pins

A

3-5 mm apart to minimize tooth fracture and condense resotrative material around pin

40
Q

do pins increase or decrese resistance form

A

decrease

41
Q

was there a relationship demonstrated between rotational speed during channel preparation and complication incidence or type

A

NO

42
Q

does hand wrenching or using hand piece cause more complications when placing pins

A

hand piece so hand wrench!

43
Q

common errors of pin placement

A
  1. pulpal penetrations
  2. eternal perforation
  3. enlarged pin channel
  4. twist drill will not cut
44
Q

radiographic information can and cannot determine what when it comes to pin placement

A

can establish external perforation
difficult to determine pulpal exposure

45
Q

what to do if you have an enlarged pin channel

A
  1. redrill deeper channel at same site and seat a new pin
  2. cement existing pin into oversize channel using glass ionomer cement
  3. new channel 3-5 mm away
46
Q

does the pin bender place the fulcrum within the pin or the tooth?

A

within the pin, not the tooth

23 Operative (15 decks)

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