DTUK1210

May 3-9, 2010United Kingdom Edition opposing surfaces (often the distal and mesial dental sur- face) are made parallel to one another. This needs to be con- sidered during preparation. Using the resilience tele- scope is a frequently used solu- tion, where there are only a few (one to three) existing teeth. Here, there is a 0.3mm to 0.5mm space between the primary and secondary crown on the occlu- sal face of the telescope. This means that the prosthesis rests on the mucosa – when it is not under pressure. The “resilience gap” is only removed with pres- sure of chewing and there is a particularly gentle load or strain on the remaining natural teeth. This form of telescope is the foundation for the so called “cover denture” prosthesis. Ex- ternally, it is indistinguishable from a full prosthesis. The secondary crown is worked into the prosthesis (sol- dered, glued or embedded with retention within the synthetic matrix of the prosthesis. Only after the final fitting is the pri- mary crown cemented firmly onto the prepared tooth stump. Telescopes are, next to attach- ments, seen as standard in Ger- many, Switzerland and Scandi- navia for the treatment of larger dental gaps using a removable prosthesis. The construction of telescopic prosthetics requires a high standard of preparation and processing by the dentist and their dental laboratory. Working with attachments Like telescopes, attachments are invisible, firm anchoring, which can be released by the patient themselves. The male attachment elements (in this instance: Precivertix extracoro- nal) are attached to the crown blocks or bridges, while the relevant complementary ele- ment is attached to the remov- able dentures. Attachments are prefab- ricated (off-the-shelf attach- ments) and are then joined to the bespoke denture in the lab (creating bespoke attach- ments). Attachments are also classified according to their fit- ting; either fitting into the an- chor tooth (intracoronal attach- ments) or those with fittings external to the tooth (extracoro- nal attachments). An attachment always com- prises two parts; the receptive (or the female) part, and the insertion (or male) part. Which part sits on the crown and which on the removable denture de- pends on the manufacturer and the practitioner’s judge- ment on a given situation. Par- ticularly popular versions are Precivertix and Rod Attach- ments and similar forms. You can distinguish attach- ments according to the attach- ment mechanism: a) friction attachments (female and male components are joined by their precise fit – similar to telesc- opic attachments). b) Reten- tive attachments (the hold is achieved by using elastic ele- ments which rest in grooves or indentations). c) The attach- ment can also be fitted with a bolt for optimal fastening. EverClear™ a triumph in clarity For details of Carl Zeiss and our wide range of other dental products contact: See what you are missing... Carl Zeiss EyeMag Smart 2.5x loupes Carl Zeiss GTX Carl Zeiss EyeMag Pro prismatic loupes Carl Zeiss OPMI® Pico Nuview Ltd, Vine House, Selsley Road, North Woodchester, Gloucestershire GL5 5NN Tel: 01453 872266 Fax: 01453 872288 E-mail: info@nuview-ltd.com Web: www.voroscopes.co.uk •Floorstand, ceiling or wall mounted •Photoport for digital camera •Five step magnification •Superlux 180 Xenon daylight illumination V2 LED Illumination ‘The methods mentioned here are not par- ticularly ‘cool’, new applications; rather they have their origin in America in the 20th century. The anchoring of partial or hybrid prostheses with individually manu- factured double crowns was first described by Peeso (1916) and Goslee (1923)’ page 20DTà Fig.4 Telescoping crowns during Insertion Fig.5 Front teeth bridge with Rod attachments Fig. 3 Copies

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