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:: Partial Denture Designs ::

There are virtually an infinite variety of partial denture designs, below are some examples. For guidance discuss the planning and design needs of your patients’ removable prosthesis with a supervisor or your tutor. Some examples below are fabricated on identical casts but utilise different framework designs and are included for discussion.

 


Figure 1
Figure 2

 

 

These two designs both use lingual bars with a Kennedy’s clasp or continuous connector. These skeletal designs minimally encroach upon the oral tissues whilst utilising indirect retention. Occlusal rests help to distribute occlusal loading.

 

 

 

 

 

 

Figure 3

 

 

 By contrast this lower framework uses a lingual plate and therefore covers a large area of soft and hard tissue. The larger area of coverage is offset by the cross-sectional thickness that can be made significantly thinner than a corresponding lingual bar. This design has one occlusal rest on the second molar with a circumfrential clasp and an occlusally approaching clasp on the left canine.

 

 

Figure 4
Figure 5

 

 

 

Identical casts showing differing designs. The lingual bar on the left is less obtrusive but bulkier. The plate on the right is approximately 0.5mm. thick but covers a greater area. The condition of the patient’s oral tissues and their dental history will help determine the approach you adopt.

 

 

 

Figure 6 

 

This upper skeletal framework uses a continuous clasp to carry an isolated tooth anteriorly. This has the advantage of reducing denture base coverage in the anterior part of the palate. Two occlusal rests are present and three buccal clasps have been incorporated for direct retention.

Figure 7
Figure 8

 

 

 

These two upper frameworks are designed to carry a minimal number of teeth. On the left only one tooth is replaced but stability is maintained by extending the design across the arch with additional support and indirect retention obtained from the two-Cummer arm clasps. Just two teeth are included on the design on the right. A Cummer arm is used again to help stabilise the denture, with wrought gold clasps for indirect retention.

Figure 9
Figure 10

 

These two casts are identical with different frameworks constructed. The extension of the denture bases and clasping are the same, the skeletal framework provides less intrusion on to the tissues but is thicker in cross-section. The plate is considerably thinner and therefore less obtrusive, but covers a larger area of tissue. Although the clasps may appear to be gold, they are cast cobalt chromium which have been gold plated for aesthetic reasons. Indirect retention has been included and some of the occlusal loading has been distributed onto the hard tissues via the occlusal rests.

 

 

منقول بواسطة: dody

منتديات المختبر السعودي لتقنية الأسنان

www.den-lab.com

 

 

 

 

 

 
 
 

 

 

 

 

 

 

 

 

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