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The plaster casts are carved interdentally on the oral and buccal side so that the holding springs can be inserted deep into the retentive area. The first and lower part of the spring is bent from labial to occlusal and then towards lingual into the retention. |
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The second and upper part of the spring is bent from lingual to occlusal above the contact points into the undercut beside the first part. On the occlusal surface, the wire is bent 180° and then back on the other side of the first part in order to be bent into the retention. |
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Because the Lorenz spring consists of two separately bent parts, it can reach far into the undercuts and is therefore a very strong retaining element. |
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