screw-retained
single crowns
using custom-cast
abutments
screw-retained restorations
screw-retained single crowns using custom-cast abutments
The custom castable abutment, hexed (UCLA) offers the clinician the option of making a custom crown that is screw-retained onto the implant.
Use this technique for a lab-fabricated, custom, screw-retained crown. The custom crown can complement soft tissue contour and height and
can also correct angulation.
component options
• custom castable (UCLA) abutment, hexed
• .050” (1.25mm) hex driver
• torque wrench
1 Make an implant-level impression
Follow the steps for creating an implant-level
impression using either the open tray technique using
the direct pick-up coping module or the closed tray
technique using the indirect transfer coping module.
2 Lab step - Pour the working model
Fabricate a working model following conventional
laboratory procedures. A soft tissue model is
recommended whenever the margins are subgingival.
Follow the steps for creating an implant-level stone
model (hexed) using either the open tray technique
using the direct pick-up coping module or the closed
tray technique using the indirect transfer coping
module.
Lab step - Seat, mark, and modify the
3 abutment
Seat the selected custom castable abutment onto the
implant analog in the working model. Hand tighten the
abutment screw with an .050” (1.25mm) hex driver.
Determine modifications needed to provide adequate
room for the fabrication of the crown. Modify the
plastic sleeve of the abutment with a cutting disk or
an acrylic bur for correct vertical and interproximal
clearances. Modify height leaving the sleeve out of
occlusion 1-2 mm.
Important:
For screw-retained restorations, maintain at least 3mm
from the abutment platform to avoid damaging the
abutment screw.
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screw-retained restorations
screw-retained single crowns using custom-cast abutments
4 Lab step - Wax the custom abutment
Use wax and/or acrylic burnout resin to incorporate the
modified custom castable abutment into the pattern.
The final contours of the pattern may be built up with
crown & bridge wax.
5 Lab step - Sprue, invest and cast the abutment
Sprue, invest and cast the abutment pattern in noble
or high noble alloy according to manufacturer’s
instructions. When investing, pour the investment into
the ring very slowly to insure the investment flows up
through the screw access hole.
Note:
custom castable gold alloy specifications*
• Melting range: 1400-1490°C
• Coefficient of thermal expansion: 12.2x10-6K-1
• Hardness HV5: >215
• Tensile Strength: >750 MPa
• Composition: 60% Gold, 20% Platinum, 19%
Palladium, 1% Iridium
* Material Data Sheet for Ceramicor® from Centres+Métaux
6 Lab step - Divest, fit, and finish the abutment
Divest, fit, and finish the casting following conventional
laboratory techniques.
Important:
When divesting the casting, it is important not to
sandblast the implant/abutment interface. Doing so
may result in a poor fit between the abutment and
the implant. Use of a chemical investment remover is
recommended to preserve the precision fit.
Confirm the cast abutment on the working model.
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screw-retained restorations
screw-retained single crowns using custom-cast abutments
7 Lab step - Apply the porcelain
Prepare the cast abutment to receive the opaque layer
according to routine laboratory procedures.
Apply porcelain and finish according to routine
laboratory procedures.
Note:
When applying porcelain, use caution not to get any
porcelain into the screw-access holes. Polish any metal
margins as is routine.
Seat the finished crown onto the analog on the working
model and send to clinician for patient delivery.
send to clinician
• crown
• abutment screw
• working model
8 Seat the final restoration
Sanitize the finished crown using standard clinical
procedure. Remove the healing abutment or temporary
prosthesis from the implant with an .050” (1.25mm)
hex driver.
Make sure the implant prosthetic platform is free of
bone and soft tissue. Irrigate the internally-threaded
connection of the implant and dry.
Secure the crown onto the implant using the abutment
screw and an .050” (1.25mm) hex driver. Hand tighten.
9 Check and modify the restoration
Check the occlusion and contacts. There should only
be light contact in centric occlusion and no contact in
lateral excursions. Modify as necessary and polish after
making adjustments.
Take a radiograph along the long axis of the implant to
ensure that the crown is seated completely in the hex of
the implant.
Note:
The X-ray tube must be positioned perpendicular to the
implant prosthetic platform.
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screw-retained restorations
screw-retained single crowns using custom-cast abutments
10 Tighten the abutment screw
Tighten the abutment screw to 30 Ncm using an .050”
(1.25mm) hex driver and a calibrated torque wrench.
11 Fill the screw access channel
Place a resilient material of choice (gutta-percha,
silicone or temporary filling material) into the screw
access channel. This allows for easy access to the
abutment screw in the future. Fill the remainder of the
channel with a composite resin material of choice.
Take an x-ray for final prosthesis delivery records.
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notes
customer care:
888.246.8338
notes
customer care:
888.246.8338
Direct Offices
BioHorizons USA
888-246-8338 or
205-967-7880
BioHorizons Canada BioHorizons Spain BioHorizons UK
866-468-8338 +34 91 713 10 84 +44 (0)1344 752560
BioHorizons Germany BioHorizons Chile BioHorizons Italy
+49 761-556328-0 +56 (2) 23619519 800-063-040
Distributors
For contact information in our 90 countries, visit www.biohorizons.com
BioHorizons®, Laser-Lok®, MinerOss®, AutoTac®, Mem-Lok® and TeethXpress® are registered trademarks of BioHorizons. Unigrip™ is a trademark of Nobel Biocare AB. Zimmer® Dental
ScrewVent® and Tapered ScrewVent® are registered trademarks of Zimmer, Inc. AlloDerm® and AlloDerm GBR® are registered trademarks of LifeCell Corporation. Grafton® DBM is a registered
trademark of Medtronic, Inc. Spiralock® is a registered trademark of Spiralock Corporation. Pomalux® is a registered trademark of Westlake Plastics Co. Locator® is a registered trademark of
Zest Anchors, Inc. Delrin® is a registered trademark of E.I. du Pont de Nemours and Company. Bio-Gide® is a registered trademark of Edward Geistlich Sohne AG Fur Chemische Industrie.
Not all products shown or described in this literature are available in all countries. As applicable, BioHorizons products are cleared for sale in the European Union under the EU Medical Device
Directive 93/42/EEC and the tissues and cells Directive 2004/23/EC. We are proud to be registered to ISO 13485:2003, the international quality management system standard for medical
devices, which supports and maintains our product licences with Health Canada and in other markets around the globe. Original language is English. ©BioHorizons. All Rights Reserved.
This prosthetic technique module may contain references to the complete Prosthetic Manual (L02015).
To download the full Prosthetic Manual, please visit www.biohorizons.com
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L02015-026 REV D AUG 2016
