Assessment of shoulder dimensions and angles of procelain bonded to metal crown preparations

Seymour, Kevin; Zou, Lifong; Samarawickrama, Dayananda; Lynch, Edward

doi:10.1016/s0022-3913(96)90033-5

Cited by 28 publications

(30 citation statements)

References 16 publications

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“…The internal line angle for all types of tooth was in the range of 81.08 to 141.22 degrees compared with the ideal of 90 to 110 degrees recommended (34). The majority of preparations were therefore satisfactory, however, some preparations were well outside the ideal range yet crowns were able to be constructed for these preparations.…”

Section: Discussionmentioning

confidence: 86%

“…Seymour et al (34) stated that the ideal internal line angle should be in the range of 90 to 110 degrees and the majority of the current samples fell within this range. In 1996, Seymour et al (31) further examined 24 extracted human teeth, prepared to receive metal ceramic crowns.…”

Section: Discussionmentioning

confidence: 95%

“…In 1996, Seymour et al (31) further examined 24 extracted human teeth, prepared to receive metal ceramic crowns. The preparations were replicated and scanned in the midfacial plane by a coordinate measuring machine with a non contact probe recording x, y, and z surface co-ordinates.…”

Section: Discussionmentioning

confidence: 99%

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Margin width, internal line angle and labial emergence profiles of maxillary metalloceramic

Yahya

Youngson

2007

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The purpose of this study were to compare the emergence profiles of crowns with their contralateral tooth, in vitro, and to determine if there is any association between the design of tooth preparations and the resultant emergence profile. 50 working models used for single crown construction were examined. Measurements of the faciolingual width of the crowns and contralateral teeth were taken using digital calipers. Internal line angles and the margin width of dies and the emergence profile of the corresponding crowns were measured from longitudinally sectioned polyvinylsiloxane indices mounted on a flat-bed scanner using image analysis software. Using Students t tests, no statistically significant differences (p>0.05) were found for shoulder width (mean 0.94 ± 0.23mm), internal line angle (mean 105.83 ± 13.57°) or emergence profiles (28.56 ± 12.95°) in the different (anterior, premolar or molar) preparations or crowns. The mean emergence profiles for all crowns was statistically significantly greater (p<0.001) than the contralateral tooth (mean 15.33 ± 7.77°). Using linear regression, there was a weak statistical relationship between emergence profile and margin width (Emergence profile° = 31.352 -2.973 x margin width (mm)). There was no statistical association between the internal line angle and the resultant emergence profile. In conclusion, the emergence profiles of crowns were higher than the contralateral teeth. Maxillary metalloceramic crown preparations had shoulder widths that did not conform to recommendations in standard texts but line angles were within a satisfactory range. The margin width exerts a weak effect upon the emergence profile of the crown.

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Section: Discussionmentioning

confidence: 86%

Section: Discussionmentioning

confidence: 95%

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Margin width, internal line angle and labial emergence profiles of maxillary metalloceramic

Yahya

Youngson

2007

ADUM

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“…Metrology has also been used in dentistry to measure the amount of tooth wear on the surface of a tooth. Specifically in the preparation of crowns, it has been used previously to measure the width of the crown preparation margin, the angulation of the margin (Seymour et al,1996, Cherukara et al, 2002 and the taper angle formed when a tooth is prepared for a crown (Rafeek et al, 2006(Rafeek et al, , 2010.…”

Section: Main Issuementioning

confidence: 99%

“…With surface form (shape) measurements, Co-ordinate Measuring Machines (CMMs) are more suited for the inspection of automotive parts in industry since the 1950's (Bosch, 1995). Since the late 90's, along with the development of new technology in optics and computing, numerous applications have been advanced in the fields of medicine and dentistry (Chadwick, 1989;Seymour et al 1996;Kabban, et al 2001;Zou, et al , 2009Cherukara GP et al 2002;Theocharopoulos et al, 2010;Morris et al 2011 ).…”

Section: Proposed Alternativementioning

confidence: 99%