Design guidelines
H-6187-0030-01-A
LaserRPD™ design guidelines
Renishaw part no: H-6187-0030-01-A
Issued: 11.2015
© 2015 Renishaw plc. All rights reserved.
This document may not be copied or reproduced in whole or in part, or transferred to any other media
or language, by any means, without the prior written permission of Renishaw plc.
The publication of material within this document does not imply freedom from the patent rights of
Renishaw plc.
Disclaimer
RENISHAW HAS MADE CONSIDERABLE EFFORTS TO ENSURE THE CONTENT OF THIS
DOCUMENT IS CORRECT AT THE DATE OF PUBLICATION BUT MAKES NO WARRANTIES
OR REPRESENTATIONS REGARDING THE CONTENT. RENISHAW EXCLUDES LIABILITY,
HOWSOEVER ARISING, FOR ANY INACCURACIES IN THIS DOCUMENT.
Trade marks
RENISHAW and the probe symbol used in the RENISHAW logo are registered trade marks of
Renishaw plc in the United Kingdom and other countries. apply innovation and names and
designations of other Renishaw products and technologies are trade marks of Renishaw plc or its
subsidiaries.
All other brand names and product names used in this document are trade names, trade marks, or
registered trade marks of their respective owners.
Contents
1.0 General information ......................................................... 1.1
2.0 Design guidelines ..........................................................2.1
Connector design – major connectors .....................................2.1
Connector design – minor connectors .....................................2.2
Sublingual bar design ..................................................2.3
Clasp design .........................................................2.4
Meshwork design .....................................................2.5
3.0 Customer support ..........................................................3.1
LaserRPD™ design guidelines
ii
Contents
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1.1
1.0 General information
These guidelines provide information to trained dental technicians when designing LaserRPDs™
- metal 3D printed removable partial dentures (RPDs). They should be used in conjunction with
traditional methodologies and clinical experience, in order to design RPDs which meet the patient’s,
technician’s and dentist’s requirements. Final designs are ultimately the responsibility of the duly
qualified practitioner.
As with any manufacturing process, there are certain constraints which must be considered when
designing for metal 3D printing. To achieve good feature definition, Renishaw advise avoiding features
which are less than 0.5 mm thick or which taper to very fine points, such as sharp lips on acrylic
boundaries or the tips of clasps. Renishaw cannot guarantee successful manufacture if features
include geometry under 0.5 mm thick.
LaserRPD™ design guidelines
1.2
General
information
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2.12.1
2.0 Design guidelines
Connector design – major connectors
A thickness of between 0.7 mm and 1.2 mm is recommended for major connectors in order to ensure
framework stability. Critical features, such as clasps and meshwork boundaries, should have a
minimum thickness of 0.7 mm.
1.2 mm
0.7 mm
Allow extra material thickness at the initial design stage to avoid critical damage during post
processing.
LaserRPD™ design guidelines
2.2
Design guidelines
Connector design – minor connectors
In order to be suitable for manufacture, and to offer the required stability between the clasps and the
main RPD framework, it is recommended that minor connectors have a minimum width of 4 mm and a
minimum thickness of 1.5 mm.
4 mm
1.5 mm
2.3
Design guidelines
Sublingual bar design
Sublingual bars should be aproximately 3.5 mm in depth and 2 mm in thickness. This should offer
adequate strength and flexibility. If clinical requirements are such that a thinner bar is required, 0.7 mm
is the minimum recommended thickness for major connectors.
2 mm
3.5 mm
LaserRPD™ design guidelines
2.4
Design guidelines
Clasp design
As with traditional manufacture, clasps must be designed at a thickness which allows for material
removal during post processing. This reduces the risk of a poor fit or a lack of retention due to under
sizing. The figure below shows the cross section dimensions of a clasp suitable for production by
additive manufacturing.
In order to provide adequate reinforcement during deflection caused by insertion-removal, clasps
should thicken in a taper up to the clasp shoulder. The figure below shows where reinforcement has
been added to the shoulder.
Clasp design is ultimately the responsibility of the qualified practitioner.
1.5 mm2 mm
4 mm
2 mm
2.5
Design guidelines
Meshwork design
Circular patterned meshwork is recommended to maintain mesh geometry during post processing. The
recommended diameter for the holes in the mesh is 1.5 mm or greater. Larger holes may allow better
acrylic flow through the mesh.
Ø1.5 mm
1 mm
If square meshwork is required, a minimum strut thickness of 1 mm is recommended.
Ensure the clasps are well connected to the meshwork. Placing holes close to, or on, the minor
connector is not recommended.
LaserRPD™ design guidelines
2.6
Design guidelines
To ensure feature definition and ease post processing, thin lips at the acrylic boundary line (such
as that shown in the figure below) should be avoided. The lip should not taper to less than a
recommended minimum thickness of 0.3 mm, and should be a minimum of 0.75 mm in height.
Minimum thickness
at tip 0.3 mm
> 0.3 mm
> 0.75 mm
3.1
3.0 Customer support
If you require any help with the content of this guide, or experience design software issues, please
contact Renishaw Dental Support on +44 (0) 1453 524543.
If Renishaw encounter any issues or consider a design to be unsuitable for manufacture, you may be
contacted to discuss the options available to you.
LaserRPD™ design guidelines
3.2
Customer support
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Renishaw plc
New Mills, Wotton-under-Edge,
Gloucestershire, GL12 8JR
United Kingdom
T +44 (0)1453 524524
F +44 (0)1453 524901
E uk@renishaw.com
www.renishaw.com
*H-6187-0030-01*
© 2015 Renishaw plc Issued 11.2015 Part no. H-6187-0030-01-A
For worldwide contact details, visit
www.renishaw.com/contact
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