Materiales 3m

A comprehensive guide to achieving the best results with 3M ESPE Prefabricated Crowns.
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Crowns

Prefabricated
User Guide

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3M™ ESPE™ Stainless Steel Crowns
3M™ ESPE™ Stainless Steel Primary Molar Crowns 3M™ ESPE™ Stainless Steel Permanent Molar Crowns

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3M™ ESPE™ Polycarbonate Crowns

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3M™ ESPE™ Iso-Form™ Crowns

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Other 3M ESPE Crowns3M™ ESPE™ Gold Anodized Crowns 3M™ ESPE™ Unitek™ Stainless Steel Crowns

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3M™ ESPE™ Strip Crowns

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Ordering Information
Introductory Kits 3M ESPE Stainless Steel Crowns Primary Molars Permanent Molars 3M ESPE Polycarbonate Crowns 3M ESPE Iso-Form Crowns 3M ESPE Unitek Stainless Steel Crowns Primary Molars Permanent Molars 3M ESPE Gold Anodized Crowns 3M ESPE Strip Crowns Refills3M™ ESPE™ Crown Instruments
3M ESPE Prefabricated Crowns - User Guide

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3M ESPE Stainless Steel Crowns
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3M ESPE Stainless Steel Crowns are designed to provide long-term coverage of primary molar teeth and long-term provisional coverage of permanent molar teeth. Different designs of prefabricated metal crowns have been offered to the dentalprofession over the years ranging from straight sided “bucket” crowns to the anatomically shaped 3M ESPE stainless steel crowns available today. 3M ESPE stainless steel crowns have been designed to accurately duplicate the anatomy of primary and first permanent molars in a selection of sizes (fig. 1). The crowns are manufactured with a life-like height, contour and occlusal surface. They arepre-crimped at the cervical margin to give good retention and a “snap” fit. The realistic anatomical shape of a

(fig. 2)

3M ESPE stainless steel primary molar crown means that minimal adjustment is necessary to obtain good retention. There is good harmony with the patient’s occlusion and the smooth

(fig. 1)

stainless steel alloy surface helps maintain gingival health and patient comfort (fig. 2).3M ESPE Stainless Steel Primary Molar Crowns
The morphology of a primary molar differs significantly from that of a permanent molar tooth. The cervical areas of primary molars are narrower than their permanent counterparts, but the most bulbous part of the crown is at the cervical third. (1) It is beneath this bulbous area at the gingival margin where the stainless steel crown obtains itsretention. The enamel and dentin of primary teeth are thinner than in the permanent dentition and the primary molar pulp chamber is comparatively large. (2) The mesial pulp horn extends toward the contact point area and the distal pulp horn lies under the center of the occlusal surface. Because the dentin is relatively thin it can be difficult
3M ESPE Prefabricated Crowns - User Guide

to achieveadequate retention in a proximal cavity even when the cavity is only moderately deep. (3)

Longevity of Primary Molar Restorations
A number of authors have compared longevity of amalgam and stainless steel crown restorations in primary teeth. Braff in 1975 (4) found that 88% of amalgams placed in children needed follow-up treatment compared with 30% of the stainless steel crowns. Dawson et al (5)found that for restorations placed in children of average age 5.5 years, 58% of Class I and 70% Class II amalgams in primary molars needed further treatment before eight years old.

However, only 11% of stainless steel crowns needed further treatment. The authors concluded that stainless steel crowns are the treatment of choice for primary molars, especially for multi-surface lesions in the firstprimary molar. Holland et al (6) found the median survival time for amalgams in the primary molars of three-year-old children was 11 months, and for seven- and eight-year-old children was 4 months. More recently, Roberts and Sherriff (7) found from evaluating patient records in a pedodontic practice, that the replacement rate for Class I and II amalgams at five years in primary molars was...