Abstract:
BACKGROUND:Sintering porcelain on a ceramic abutment may change the microstructure and result in aging processes that influence the mechanical properties, internal strain, and the three-dimensional form of the abutment, thus causing a possible misfit between the abutment and the fixture. PURPOSE:The aim was to investigate topography, microhardness, and precision of fit on yttrium-stabilized zirconia (Y-TZP) abutments before/after the sintering process. MATERIALS AND METHODS:Ten Y-TZP abutment samples were ground to a shape used in the clinical situation and divided at random into two groups: before/after sintering. After the surface roughness was measured on all abutments, the abutments were connected to fixture replicas, embedded in resin, and cut in the longitudinal axis. Both sides of the cut samples were measured with respect to microhardness and minimum distance between fixture and abutment surface. t-Test, one-way analysis of variance, and Bonferroni multiple comparisons were used to investigate statistical significant differences. RESULTS:The surface roughness (S(a) and S(dr)) after sintering was significantly higher than before sintering. The total average values of microhardness after sintering were statistically lower than before sintering with a difference of 2%. The total distance between abutment/fixture before/after sintering demonstrated no statistically significant difference. Contact between abutment/fixture was most common at the top area of the fixture. CONCLUSION:A slight decrease of microhardness and contamination of porcelain particles immediately below the veneered part were found on the Y-TZP abutment after sintering. The sintering process did not affect the precision of fit.
journal_name
Clin Implant Dent Relat Resjournal_title
Clinical implant dentistry and related researchauthors
Kanno T,Milleding P,Wennerberg Adoi
10.1111/j.1708-8208.2007.00044.xsubject
Has Abstractpub_date
2007-09-01 00:00:00pages
156-65issue
3eissn
1523-0899issn
1708-8208pii
CID044journal_volume
9pub_type
杂志文章,随机对照试验abstract:BACKGROUND:In previous studies, immediate implant placement in molar sites has been widely applied. PURPOSE:To study the clinical effect and feasibility of immediate implant placement combined with maxillary sinus floor elevation utilizing the transalveolar approach and nonsubmerged healing for failing teeth in the ma...
journal_title:Clinical implant dentistry and related research
pub_type: 杂志文章,随机对照试验
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journal_title:Clinical implant dentistry and related research
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journal_title:Clinical implant dentistry and related research
pub_type: 杂志文章,多中心研究
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pub_type: 临床试验,杂志文章
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更新日期:2012-06-01 00:00:00
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journal_title:Clinical implant dentistry and related research
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更新日期:2010-12-01 00:00:00
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journal_title:Clinical implant dentistry and related research
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更新日期:2008-09-01 00:00:00