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| Zest Anchor Advanced Generation
Fabrication
Instructions |
ZAAG Cast Coping/Cast-to Female
Instructions
| INDICATIONS: Overdentures
and Partial Dentures: use when non-vital roots or implants are utilized as
retaining abutments. The female maybe directly placed into a root, or
a coping may be cast against the female. Implant abutment females are
also available. CONTRAINDICATIONS:
Not appropriate where a totally rigid connection is required.
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FEATURES:
- Subgingival connection results in low application
of forces near the root center of support--Abutment preservation.
- Increased surface areas on both the nylon male and
metal female allow for longer attachment life--Reduced servicing.
- Instant removal and replacement of
males--Eliminates oral chairside male pickup.
- Universal joint stress relief with vertical
resiliency--Abutment preservation.
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Direct
Placement of the Female
| 1.
Prepare and measure study casts to determine if adequate vertical space is
available, and make selection of regular or mini size attachment. |
For regular size, space must equal
or exceed the following:
- Width of root surface: 4.0mm
- Distance from root surface to opposing dentition:
4.5mm
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For mini size, space must equal or
exceed the following:
- Width of root surface: 3.5mm
- Distance from root surface to opposing dentition:
3.5mm
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| 2.
Decoronate the root and complete endodontic therapy. The coronal
surface of the root should be prepared as low as possible. |
The canal may be
prepared for the female using one of two techniques.
#1. Technique
for the use of Carbide Burs and Sizing Diamonds
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1 |
2 |
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3. Drill a pilot hole with a
#700 carbide bur to a depth of 4mm for a regular size female.
Alignment of the drill should follow the path of insertion of the denture.
The pilot hole need not follow the root canal (Fig1). For a mini
size female drill the pilot hole to a depth of 2mm (Fig 2). |
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3 |
4 |
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4. Enlarge the pilot hole
with a #8 round carbide bur to a depth of 3mm (Fig 3) for a regular
size female, and to a depth of 2mm for a mini size female (Fig 4). |
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5 |
6 |
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5. Complete the preparation
for the surgical stainless steel female with the ZAAG Diamond Sizing Bur
(standard or mini). The Diamond Sizing Bur should be used to a depth
where a full 360º recessed seat is created on
the occlusal surface of the root (Fig 5 & 6). This will assure a firm
seating of the female and a proper seal. Keep the Diamond Bur rotating
throughout this entire procedure, including insertion and removal of the
instrument, to prevent breakage of the tip. Use plenty of water as
coolant during the process. |
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7 |
8 |
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6. Using the ZAAG Parallel
Post as a handle, try in the metal female to check for proper fit (Fig 7 &
8). When placing multiple attachments, use the metal female try-in
with Parallel Post as a guide to create the following pilot holes parallel
to the first preparation.
7. Cement the metal female
component in place with composite resin cement or cement of choice. |
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9 |
10 |
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8. After the cement has set,
round off and polish the root surface from the metal flange to the tissue
(Fig 9 & 10). Important note:
It is imperative that the root surface immediately surrounding a ZAAG
attachment be finished down the exact level or lower than the top of the
female. This will allow the ZAAG male with centering sleeve to seat
completely in the female. |
#2. Technique
using the ZAAG One-Step Drill
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11 |
12 |
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1. Complete the reduction of
the non-vital teeth to the gingival level.
2. The ZAAG One-Step Drill
is self starting and pilot holes are not necessary.
3.
At slow speed (750 RPM), drill a hole with the drill to a depth where a full
360º recessed seat is created on the occlusal
surface of the root. This will assure firm seating of the female and
facilitate a proper seal. Water should be used generously when cutting
with the ZAAG One-Step Drill (Fig 11 & 12). |
Placement
of the Male Anchor
The male may be incorporated into the prosthesis by the
laboratory during processing, or secured in position by the dentist chairside
using self-curing acrylic resin.
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| Please not the importance of blockout out all undercuts and/or utilizing a short flange in the anterior region when working with the ZAAG attachment. Appliances designed to engage the labial undercut will interfere with the proper seating and not allow proper alignment of the attachment during insertion. This may lead to bending or breakage of the nylon males. |
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| The ZAAG attachment provides excellent retention and eliminates the need to engage the labial undercut for retention. We strongly advocate keeping the labial flange short to allow proper seating of the attachments. |
Male
Placement by the Laboratory
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13 |
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1.
Cementation of the metal females and final root contouring is completed in
the dental office.
2. Place an Impression Male
in the metal female cemented in the oral cavity. Make sure you feel a
positive snap, indicating the Impression Male is fully engaged. The
male should seat flush on the flange of the metal female component (Fig 13).
3.
Make impression exercising caution not to compress the soft tissue.
The Impression Males are designed with minimum retention to be drawn in the
impression. |
| Note: a rubber base impression
material may easily pick up the Impression Males. If an alginate
material is preferred, retention of the Impression Males may be reduced by
using a blade to cut off a small section of its retentive band. |
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14 |
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4.
Substitute Model Females are placed over the Impression Males in the
impression. Make sure the Substitute Female is fully seated (Fig 14).
5.
Pour the Master Model. The Substitute Females are now part of the
Master Model as an accurate transfer of the position of the female
attachments in the oral cavity. |
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15 |
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6.
Place the male (stainless steel cap, nylon male, and centering sleeve) into
each Substitute Female. The centering sleeve eliminates movement of
the male during processing (Fig 15).
7. Complete processing of
denture base material in the technique of choice. |
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19 |
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8.
Remove the centering sleeves from the males and remove any acrylic over the
remaining root surface. There should be no contact between the root
and acrylic saddle or base (Fig 19). |
Male
Placement by the Dentist
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16 |
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1.
Cementation of the metal females and the final root contouring is completed.
2.
Snap a male (stainless steel cap, centering sleeve, and nylon male) into
each cemented female (Fig 16). Double check the retention of each male
by removing it and inserting it back into the cemented female. |
| Note: ZAAG males
are designed with a retentive fit of 2.5 lbs. If reduced retention is
desired, cut off a small section of the retentive band of the ZAAG male. |
17 |
18 |
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3. Prepare a recess in the
denture to accommodate the protruding ZAAG male. There must be no
contact between the denture and the metal cap. If the denture rests on
the male component, excess pressure on the root will result.
NOTE: It is always recommended that a vent, or "escape
vent", is cut into the lingual side of the prosthesis to allow any excess
acrylic to escape.
4.
Light cure bond the male component into the denture (Fig 17 &
18); or mix a permanent self-curing resin and place a small amount in the
recess of the denture, and around the top area of the metal cap. |
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19 |
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5.
Insert the denture into position in the oral cavity. Guide the patient
into occlusion, maintaining a proper relationship with the opposing arch.
Maintain the denture in a passive condition, without compression of the soft
tissue, while the acrylic sets. Excessive occlusal pressure during the
setting time may cause tissue recoil against the denture base, and could
contribute to dislodging and wear of the ZAAG males.
6.
Remove the centering sleeve from the Denture Male component. Remove
any acrylic over the remaining root surface. There should be no
contact between the root and the acrylic saddle or base (Fig 19). |
| 7.
Instruct the patient in the path of insertion and have the patient insert
and remove the prosthesis several times. The snap into retention
should be accomplished by finger pressure without the aid of the opposing
teeth. Do not "bite" the prosthesis in to place. |
How to
change the male
Important note: The retention diameters of the ZAAG
standard and mini males are different. Therefore, the ZAAG male in the
existing denture must be replaced with the same type. The difference in
retention diameters can be measured at 2.1mm for the Standard ZAAG male, and
1.6mm for the Mini ZAAG male.
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20 |
21 |
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1. Guide the Male Coring
Tool over the nylon male and cut out the core of the male at medium RPM (Fig
20).
NOTE: If too much heat is generated, the metal
cap may melt the surrounding denture resin and dislodge. A small
amount of cold water will help keep the metal cool while coring out the
nylon males.
2.
Using a blade or explorer-like instrument, collapse the remaining plastic
ring into the open space created by the removal of the core and lift
out (FIG 21). |
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22 |
23 |
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3. Use the Seating Tool to
firmly push a ZAAG Replacement Male into the metal denture cap (Fig 22).
The nylon male must SNAP securely into place, ending up level with the rim
of the stainless steel cap (Fig 23). |
Reline
and Rebase
| 1.
Using a trephine bur, remove the entire male (metal cap and nylon male) from
the overdenture, taking care not to damage the metal housing. All
males should be removed for the reline procedure.
2.
Trim as much acrylic from the stainless steel cap male as possible using a
coarse sandpaper disk. It is not necessary to remove all acrylic from
the metal housing for reuse.
3.
Place an Impression Male into each cemented female attachment for reline
impression pickup.
4.
Take a reline impression. Using a Substitute Model Female as an
analogue, reposition the denture components into the overdenture following
steps in "Male Placement by Laboratory."
NOTE: Extra centering
sleeves are provided in all ZAAG attachment Kits to eliminate movement of
the Denture Male Component during processing. |
T0045.REV.00
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