2 research outputs found
Effect of restoration design
Indiana University-Purdue University Indianapolis (IUPUI)PURPOSE: To evaluate the fatigue failure load of distinct lithium disilicate restoration designs cemented on a chairside titanium-base (VariobaseTM for CERECÂź, StraumannÂź LLC, USA) for restoring anterior implant restoration.
MATERIALS AND METHODS: Left maxillary incisor restoration was virtually designed in 3 groups (n=10; CTD: lithium disilicate crowns cemented on custom-milled titanium abutments; VMLD: monolithic full-contour lithium disilicate crowns cemented on titanium-base; and VCLD: lithium disilicate crowns cemented on lithium disilicate customized anatomic structures then cemented on titanium-base). The titanium-base was air-abraded with aluminum oxide particles, 50 ”m at 2 bars. Subsequently the titanium-base was steamed, air-dried and a thin coat of silane (Monobond Plus, Ivoclar VivadentÂź, USA). All ceramic components were surface treated with hydrofluoric acid etching gel, follow by silanized, and bonded with resin cement (Multilink Automix, Ivoclar VivadentÂź, USA). Specimens were fatigued at 20 Hz, starting with a load of 100 N (Ă5000 cycles), followed by stepwise loading up to 1400 N at a maximum of 30,000 cycles each. The failure loads, number of cycles, and fracture analysis were recorded. Data were statistically analyzed using one-way ANOVA followed by pair-wise comparisons (p < 0.05). Kaplan-Meier survival plots and Weibull survival analyses were reported.
RESULT: For catastrophic fatigue failure load and total number of cycles for failure, VMLD (1260 N, 175231 cycles) was significantly higher than VCLD (1080 N, 139965 cycles) and CDT (1000 N, 133185 cycles). VMLD had higher Weibull modulus (11.6), demonstrating higher structural reliability.
CONCLUSIONS: VMLD performed the best fatigue behavior when compared with the two other groups
Fatigue Failure Load of Lithium Disilicate Restorations Cemented on a Chairside TitaniumâBase
PurposeTo evaluate the fatigue failure load of distinct lithium disilicate restoration designs cemented on a chairside titanium base for maxillary anterior implantâsupported restorations.Materials and MethodsA leftâmaxillary incisor restoration was virtually designed and sorted into 3 groups: (n = 10/group; CTD: lithium disilicate crowns cemented on customâmilled titanium abutments; VMLD: monolithic fullâcontour lithium disilicate crowns cemented on a chairside titaniumâbase; VCLD: lithium disilicate crowns bonded to lithium disilicate customized anatomic structures and then cemented onto a chairside titanium base). The chairside titanium base was airâabraded with aluminum oxide particles. Subsequently, the titanium base was steamâcleaned and airâdried. Then a thin coat of a silane agent was applied. The intaglio surface of the ceramic components was treated with 5% hydrofluoric acid (HF) etching gel, followed by silanization, and bonded with a resin cement. The specimens were fatigued at 20 Hz, starting with a 100 N load (5000Ă load pulses), followed by stepwise loading from 400 N up to 1400 N (200 N increments) at a maximum of 30,000 cycles each. The failure loads, number of cycles, and fracture analysis were recorded. The data were statistically analyzed using oneâway ANOVA, followed by pairwise comparisons (p < 0.05). KaplanâMeier survival plots and Weibull survival analyses were reported.ResultsFor catastrophic fatigue failure load and the total number of cycles for failure, VMLD (1260 N, 175,231 cycles) was significantly higher than VCLD (1080 N, 139,965 cycles) and CDT (1000 N, 133,185 cycles). VMLD had a higher Weibull modulus demonstrating greater structural reliability.ConclusionVMLD had the best fatigue failure resistance when compared with the other two groups.Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/152519/1/jopr12911_am.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/152519/2/jopr12911.pd