Additive Layer Manufacture (ALM) of dental prostheses allows the direct fabrication of parts from CAD data, replacing a human-sensible process with a faster reliable automatic one. Direct Metal Laser Sintering (DMLS) of Cr-Co alloys produces parts to be directly finished with ceramic and employed. PURPOSE: This study evaluated (1) the application of DMLS process for obtaining final dental prostheses in Co-Cr alloy, to compare mechanical characteristics of cast parts and layer-manufactured ones produced with different alloys and processes; and (2) the effect of porcelain firing cycles on mechanical properties. METHODS: This study was conducted on three classes of tensile specimens in five groups of six specimens: class 1 – 12 specimens built by DMLS (PM100T – Phenix System, France) with Co-Cr powder NOBIL 4000S (NOBIL METAL - Italy) divided in two groups (6 specimens were processed with ceramic heat treatment); class 2 – 12 specimens built by traditional lost-wax casting from Co-Cr bars for fixed prostheses V-CERAM MAGI LINE (SHERA - Germany) divided in two groups (6 specimens were processed with ceramic heat treatment); class 3 – 6 tensile specimens built by traditional lost-wax casting from Cr-Co bars for partial removable prostheses REMANIUM 800+ (Dentaurum - Germany). RESULTS: UTS of all sintered specimens (1174±165 MPa) was higher than of cast ones (503±45 MPa, 499±62 MPa, 712±51 MPa, respectively, for as cast Co-Cr, heat treated Co-Cr, and Remanium) where many porosities were found. UTS decreases after heat-treatment both for cats and DMLS parts. Yield strength was also highest for the laser sintered group (1148±161 MPa).No significant idfference was found for the elastic modulus of compared groups (P=0.398). CONCLUSIONS: DMLS of Co-Cr alloys produces excellent strength and absence of defects compared to traditional casting. This result is due to the fine microstructure obtained by DMLS (high thermal rate, heterogeneous nucleation).

DMLS DENTAL ALLOYS VS TRADITIONAL TECHNIQUE / Bortolini, Sergio; Gatto, Andrea; Natali, Alfredo; Y., Ucar; G., Montin; Bassoli, Elena; Denti, Lucia; Consolo, Ugo; L., Iuliano; T., Akova. - In: JOURNAL OF DENTAL RESEARCH. - ISSN 0022-0345. - STAMPA. - 88:(2010), pp. 95-95. (Intervento presentato al convegno 88TH GENERAL SESSION & EXHIBITION OF THE IADR, BARCELLONA tenutosi a BARCELLONA nel 14-17 july 2010).

DMLS DENTAL ALLOYS VS TRADITIONAL TECHNIQUE

BORTOLINI, Sergio;GATTO, Andrea;NATALI, Alfredo;BASSOLI, Elena;DENTI, Lucia;CONSOLO, Ugo;
2010

Abstract

Additive Layer Manufacture (ALM) of dental prostheses allows the direct fabrication of parts from CAD data, replacing a human-sensible process with a faster reliable automatic one. Direct Metal Laser Sintering (DMLS) of Cr-Co alloys produces parts to be directly finished with ceramic and employed. PURPOSE: This study evaluated (1) the application of DMLS process for obtaining final dental prostheses in Co-Cr alloy, to compare mechanical characteristics of cast parts and layer-manufactured ones produced with different alloys and processes; and (2) the effect of porcelain firing cycles on mechanical properties. METHODS: This study was conducted on three classes of tensile specimens in five groups of six specimens: class 1 – 12 specimens built by DMLS (PM100T – Phenix System, France) with Co-Cr powder NOBIL 4000S (NOBIL METAL - Italy) divided in two groups (6 specimens were processed with ceramic heat treatment); class 2 – 12 specimens built by traditional lost-wax casting from Co-Cr bars for fixed prostheses V-CERAM MAGI LINE (SHERA - Germany) divided in two groups (6 specimens were processed with ceramic heat treatment); class 3 – 6 tensile specimens built by traditional lost-wax casting from Cr-Co bars for partial removable prostheses REMANIUM 800+ (Dentaurum - Germany). RESULTS: UTS of all sintered specimens (1174±165 MPa) was higher than of cast ones (503±45 MPa, 499±62 MPa, 712±51 MPa, respectively, for as cast Co-Cr, heat treated Co-Cr, and Remanium) where many porosities were found. UTS decreases after heat-treatment both for cats and DMLS parts. Yield strength was also highest for the laser sintered group (1148±161 MPa).No significant idfference was found for the elastic modulus of compared groups (P=0.398). CONCLUSIONS: DMLS of Co-Cr alloys produces excellent strength and absence of defects compared to traditional casting. This result is due to the fine microstructure obtained by DMLS (high thermal rate, heterogeneous nucleation).
2010
88
95
95
Bortolini, Sergio; Gatto, Andrea; Natali, Alfredo; Y., Ucar; G., Montin; Bassoli, Elena; Denti, Lucia; Consolo, Ugo; L., Iuliano; T., Akova
DMLS DENTAL ALLOYS VS TRADITIONAL TECHNIQUE / Bortolini, Sergio; Gatto, Andrea; Natali, Alfredo; Y., Ucar; G., Montin; Bassoli, Elena; Denti, Lucia; Consolo, Ugo; L., Iuliano; T., Akova. - In: JOURNAL OF DENTAL RESEARCH. - ISSN 0022-0345. - STAMPA. - 88:(2010), pp. 95-95. (Intervento presentato al convegno 88TH GENERAL SESSION & EXHIBITION OF THE IADR, BARCELLONA tenutosi a BARCELLONA nel 14-17 july 2010).
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