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Inside Dental Technology

September 2013, Volume 4, Issue 9
Published by AEGIS Communications

OT CAP Spherical and EQUATOR Threaded Attachments

Innovative options for the best treatment plan solutions

By Gianni Storni, MDT

This case details the prosthetic rehabilitation of an edentulous mandible using four implants for fabrication of a removable implant supported overdenture using Rhein83’s new OT EQUATOR for CAD/CAM milled implant bars. Developed in conjunction with innovations in CAD/CAM technology and upgraded materials, Rhein’83 has expanded their standard OT CAP and OT EQUATOR lines to include threaded interchangeable attachments, available in a 2 mm thread and a 1.6 mm thread. Both spherical (ball) attachments are available in either 2.5 mm standard or 1.8 mm micro versions. The universal 2 mm threaded OT CAP and OT Equator attachments are indicated for use with milled CAD/ CAM bars already threaded by the milling center. For this step by step procedure (shown), the 1.6 mm thread OT CAP attachments feature a corresponding sleeve, which is fabricated in the laboratory using the standard wax technique and bonded into the site of the cast or milled CAD/CAM bar.

All Rhein83 threaded attachment systems offer a wide range of retentive caps color-coded for retention and functionality. These caps are placed into titanium or stainless steel housing and cured into the metal frame or denture. During the bars’ wax fabrication, metal spacers are positioned into the wax, and later removed (Figure 1 and Figure 2).

Attachments are screwed into the sleeve using the corresponding screwdriver. There are separate sizes for the OT CAP Micro, OT CAP Normal, and EQUATOR Threaded Components. Proper tools for both the OT CAP and OT EQUATOR systems, such as parallelometer keys and caps, as well as the insertion tools necessary to obtain a correct insertion should be used.

With its 2.1 mm vertical height and 4.4 mm width, the OT EQUATOR is currently the lowest profile attachment on the market for optimal retention. Along with Rhein83‘s standard spherical line, dental technicians have a wide range of solutions and the option of CAD/CAM applications with the inclusion of Rhein83 products offered in many CAD software modules. Whether creating an economical cast bar using the wax technique or a CAD/CAM milled bar, Rhein83 solutions result in a highly precise interchangeable attachment (Figure 3 through Figure 14).


The threaded sleeve is the same for all three types of attachments. This allows technicians to adapt the prosthetic case to their work style (Figure 15) while allowing for the easy removable and replacement of parts if should there be wear or damage over the life of the device.

Gianni Storni, MDT is the vice president of Rhein83.

For more information, contact:

Rhein83 USA
P 877-778-8383

Disclaimer: The preceding material was provided by the manufacturer. The statements and opinions contained therein are solely those of the manufacturer and not of the editors, publisher, or the Editorial Board of Inside Dental Technology.

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Image Gallery

Figure 1 The model has four implants in the anterior. The technician used the OT
EQUATOR “Seeger System” to create a passive connection among the implants.
This technique does not exclude the chance to use the threaded attachments.

Figure 1

Figure 2 Once the bar is connected,
proceed by creating the space where the threaded attachment will be inserted with the sleeve.

Figure 2

Figure 3 Choose the proper spacer for the attachment. Once the spacer is isolated, place it with the apposite key.

Figure 3

Figure 4 Use the spacers (OT CAP Micro) to complete the modeling.

Figure 4

Figure 5 Always control the thicknesses of the chosen material.

Figure 5

Figure 6 Remove the spacers and proceed with the fusion of the bar.

Figure 6

Figure 7 Screw the attachment (OT CAP Micro) inside the threaded sleeve.

Figure 7

Figure 8 Position the assembled attachment together with the threaded sleeve inside the key, than apply the anaerobic composite metal-to-metal over the sleeve and inside the hole.

Figure 8

Figure 9 Wait for the composite material to harden, then proceed with the final modeling.

Figure 9

Figure 10 Once the composite hardens, the attachment can be screwed off and the technician can check to ensure that the composite material adhered correctly.

Figure 10

Figure 11 Completed bar with attachments in position. The threaded sleeve is bonded into the bar to guarantee the interchangeability of the attachment.

Figure 11

Figure 12 Completed prosthesis. Once the bar is ready, the laboratory procedures are the standard casting technique, with the opportunity to build overstructures (always recommended) directly on the master model, with the goal to obtain a solid and functional prosthesis.

Figure 12

Figure 13 The threaded sleeve is the same for all three types of attachments. This allows technicians to adapt the case to their individual working style.

Figure 13