Misfit and microleakage of implant-supported crown copings obtained by laser sintering and casting techniques, luted with glass-ionomer, resin cements and acrylic/urethane-based agents

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• 作者：Raquel Castillo-Oyagü ; e^a ; ^{raquel.castillo@odon.ucm.es} ; Christopher D. Lynch^b ; ^{lynchCD@cardiff.ac.uk} ; André ; s S. Turri&#243 ; n^a ; José ; F. L&#243 ; pez-Lozano^a ; ^{jflozano@odon.ucm.es} ; Daniel Torres-Lagares^c ; ^{danieltl@us.es} ; Marí ; a-Jesú ; s Suá ; rez-Garcí ; a^a ; ^{mjsuarez@odon.ucm.es}
• 关键词：Cement-retained implant-supported prosthesis ; Direct metal laser sintering ; Vacuum casting ; Luting cement ; Glass-ionomer cement ; Cement microleakage
• 刊名：Journal of Dentistry
• 出版年：2013
• 出版时间：January, 2013
• 年：2013
• 卷：41
• 期：1
• 页码：90-96
• 全文大小：517 K

文摘

Objectives

This study evaluated the marginal misfit and microleakage of cement-retained implant-supported crown copings.

Methods

Single crown structures were constructed with: (1) laser-sintered Co-Cr (LS); (2) vacuum-cast Co-Cr (CC) and (3) vacuum-cast Ni-Cr-Ti (CN). Samples of each alloy group were randomly luted in standard fashion onto machined titanium abutments using: (1) GC Fuji PLUS (FP); (2) Clearfil Esthetic Cement (CEC); (3) RelyX Unicem 2 Automix (RXU) and (4) DentoTemp (DT) (n = 15 each). After 60 days of water ageing, vertical discrepancy was SEM-measured and cement microleakage was scored using a digital microscope. Misfit data were subjected to two-way ANOVA and Student-Newman-Keuls multiple comparisons tests. Kruskal-Wallis and Dunn's tests were run for microleakage analysis (¦Á = 0.05).

Results

Regardless of the cement type, LS samples exhibited the best fit, whilst CC and CN performed equally well. Despite the framework alloy and manufacturing technique, FP and DT provide comparably better fit and greater microleakage scores than did CEC and RXU, which showed no differences.

Conclusions

DMLS of Co-Cr may be a reliable alternative to the casting of base metal alloys to obtain well-fitted implant-supported crowns, although all the groups tested were within the clinically acceptable range of vertical discrepancy. No strong correlations were found between misfit and microleakage. Notwithstanding the framework alloy, definitive resin-modified glass-ionomer (FP) and temporary acrylic/urethane-based (DT) cements demonstrated comparably better marginal fit and greater microleakage scores than did 10-methacryloxydecyl-dihydrogen phosphate-based (CEC) and self-adhesive (RXU) dual-cure resin agents.