The Effect of Sintering Time on the Marginal Fit of Zirconia Copings

Khaledi, Amir Ali Reza; Vojdani, Mahroo; Farzin, Mitra; Pirouzi, Sudabeh; Orandi, S.

doi:10.1111/jopr.12731

Cited by 30 publications

(21 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this study, both the particle size and content of PEG affected the porosity, as well as the pore distribution of the scaffolds, resulting in PTSDP scaffold groups characterized by variable compressive strength (CS), which range from 0.20 ± 0.03 to 1.57 ± 0.27 MPa for samples manufactured using PEGPs as shown in Figure 2D . The reduction in CS associated with increasing porosity has been observed in other ceramics ( Xu et al, 2015 ; Khaledi et al, 2018 , 2019 ). Overall, the CS appears to decrease as the amount of PEG increases regardless of the PEGP size.…”

Section: Resultssupporting

confidence: 58%

Scaffolds of Macroporous Tannin Spray With Human-Induced Pluripotent Stem Cells

Yang

Abdalla

2020

Front. Bioeng. Biotechnol.

View full text Add to dashboard Cite

Skeletal defects resulting from trauma and disease represent a major clinical problem worldwide exacerbated further by global population growth and an increasing number of elderly people. As treatment options are limited, bone tissue engineering opens the doors to start an infinite amount of tissue/bone biomaterials having excellent therapeutic potential for the management of clinical cases characterized by severe bone loss. Bone engineering relies on the use of compliant biomaterial scaffolds, osteocompetent cells, and biologically active agents. In fact, we are interested to use a new natural material, tannin. Among other materials, porous tannin spray-dried powder (PTSDP) has been approved for human use. We use PTSDP as reconstructive materials with low cost, biocompatibility, and potential ability to be replaced by bone in vivo. In this study, macro PTSDP scaffolds with defined geometry, porosity, and mechanical properties are manufactured using a combination of casting technology and porogen leaching, by mixing PTSDP and hydroxyapatite Ca10(PO4)6(OH)2 with polyethylene glycol macroparticles. Our results show that the scaffolds developed in this work support attachment, long-term viability, and osteogenic differentiation of humaninduced pluripotent stem cell-derived mesenchymal progenitors. The combination of select macroporous PTSDP scaffolds with patient-specific osteocompetent cells offers new opportunities to grow autologous bone grafts with enhanced clinical potential for complex skeletal reconstructions.

show abstract

Section: Resultssupporting

confidence: 58%

Scaffolds of Macroporous Tannin Spray With Human-Induced Pluripotent Stem Cells

Yang

Abdalla

2020

Front. Bioeng. Biotechnol.

View full text Add to dashboard Cite

show abstract

“…A clinically acceptable marginal gap for dental prostheses has been debated in the literature (Christensen, 1966;Fransson, Oilo, & Gjeitanger, 1985;McLean & Fraunhofer, 1971;Nawafleh, Mack, Evans, Mackay, & Hatamleh, 2013 et al, 2019). A study (Ahmed et al, 2019) found a significant interaction between crown thickness, finish line width and sintering protocol on the marginal fit of zirconia crown; meanwhile, another study (Khaledi et al, 2019) did not find a significant difference among three different sintering times on the adaptation of zirconia copings.…”

Section: Discussionmentioning

confidence: 96%

“…None of the studies evaluated the effect of aging on the marginal and internal adaptation of zirconia restoration. Few studies have attempted to evaluate the effects of sintering parameters on the mechanical properties of zirconia or to compare conventional sintering techniques (Almazdi, Khajah, Monaco Jr., & Kim, 2012;Ersoy, Aydo gdu, De girmenci, Çökük, & Sevimay, 2015;Kim, Ahn, Kim, Kim, & Kim, 2013;Marinis et al, 2013;Sulaiman et al, 2015) and only two have investigated the effects of using different sintering protocols on marginal fitting (Ahmed et al, 2019;Khaledi et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

Fit of tooth‐supported zirconia single crowns—A systematic review of the literature

Ahmed

Shariati

Gazzaz

et al. 2020

Clinical & Exp Dental Res

View full text Add to dashboard Cite

Purpose The purpose of this study is to systematically map all the factors that influence the fit and adaptation of zirconia crowns and/or copings. Materials and methods The investigational strategy involved carrying out an electronic search between December 1, 2009 and September 1, 2019 through the Embase and Medline databases using Boolean operators to locate appropriate articles. Results A total of 637 articles were discovered after the removal of duplicates, and 46 of these were selected for evaluation. Further, a quality assessment was performed using GRADE evaluation criteria. Conclusions Shoulder finish line preparations had slightly better marginal fit compared to chamfer finish lines. Crowns obtained from digital impressions had comparable to superior marginal adaptation compared to conventional impressions. Increasing cement space showed to improve zirconia crown adaptation. Cementation and veneering zirconia frameworks found to increase the marginal and internal gaps. Limited information is available on the effect of the alteration of sintering time/Temperature and/or sintering techniques on the adaptation of zirconia crowns. Most of the selected studies had a moderate quality assessment evaluation. Future studies could investigate the chair‐side, ultra‐fast sintering effect on the marginal gap of zirconia crowns.

show abstract

“…Khaledi et al evaluated the effect of 3 sintering times using a single 1530°C sintering temperature and found no significant influence of sintering times on the marginal fit of zirconia 3Y‐TZP copings. The results of this study, however, showed that FS resulted in greater marginal gaps than standard sintering protocol.…”

Section: Discussionmentioning

confidence: 99%

“…A few in vitro studies have recently shown that a combination of high sintering temperatures with short sintering times increased the flexural strength of zirconia and enhanced its optical properties . Additionally, a recent in vitro study showed that altering the sintering times does not affect the marginal fit of zirconia copings …”

mentioning

confidence: 99%

Marginal Discrepancies of Monolithic Zirconia Crowns: The Influence of Preparation Designs and Sintering Techniques

Ahmed

Abdallah

McCullagh

et al. 2019

Journal of Prosthodontics

View full text Add to dashboard Cite

Purpose The marginal fit is an essential component for the clinical success of prosthodontic restorations. The aim of this study was to investigate the influence of different abutment finish line widths and crown thicknesses on the marginal fit of zirconia crowns fabricated using either standard or fast sintering protocols. Materials and Methods Six titanium abutments were fabricated for receiving zirconia molar crowns. Crowns were designed virtually and milled from partially sintered zirconia blanks and divided into 12 groups (n = 10/group). Crowns in groups 1 to 6 were sintered by standard sintering, while those in groups 7 to 12 were sintered by fast sintering. Groups were further categorized according to abutment finish line and crown thickness: G1/G7 (0.5 mm chamfer, 0.8 mm thick); G2/G8 (0.5 mm chamfer, 1.5 mm thick); G3/G9 (1.0 mm chamfer, 0.8 mm thick); G4/10 (1.0 mm chamfer, 1.5 mm thick); G5/G11 (1.2 mm chamfer, 0.8 mm thick); G6/G12 (1.2 mm chamfer, 1.5 mm thick). The marginal gaps were assessed at 8 locations using digital microscopy. The linear mixed effect model analysis was performed at a significance level of 0.05. Results All vertical marginal gaps were within the clinically acceptable range (∼11‐52 μm). G8 (FS, 0.5 mm chamfer, 1.5 mm thick) demonstrated the largest gaps (47.95 μm, 95% CI: 44.57‐51.23), whereas G3 (SS, 1.0 mm chamfer, 0.8 thick) had the smallest marginal gap (14.43 μm, 95% CI: 11.15‐17.71). A linear mixed effect models showed significant differences for the interaction between finish line × crown thickness × sintering (F = 18.96, p < 0.001). The lingual surfaces showed the largest gaps in both sintering protocols, while the mesial and mesiobuccal surfaces demonstrated the smallest gaps. Conclusions There was a significant interaction between finish line widths, crown thickness, and sintering protocol on the marginal gaps in both sintering protocols; 1.0 mm finish line preparations with either 0.8 mm or 1.5 mm occlusal reduction had better marginal fit in both sintering protocols compared to 0.5 mm or 1.2 mm finish lines. Smaller marginal discrepancies were observed for standard sintering crowns with a 0.5 mm finish line and 1.5 mm occlusal reduction. Conservative occlusal reduction should be accompanied with a 1.2 mm finish line to obtain better marginal fit for full‐contoured zirconia crowns.

show abstract

The Effect of Sintering Time on the Marginal Fit of Zirconia Copings

Abstract: Different sintering times did not alter the marginal fit of the zirconia copings. The mean values of the marginal gap were within the clinically acceptable level for all three groups.

Cited by 30 publications

References 42 publications

Scaffolds of Macroporous Tannin Spray With Human-Induced Pluripotent Stem Cells

Scaffolds of Macroporous Tannin Spray With Human-Induced Pluripotent Stem Cells

Fit of tooth‐supported zirconia single crowns—A systematic review of the literature

Marginal Discrepancies of Monolithic Zirconia Crowns: The Influence of Preparation Designs and Sintering Techniques

Contact Info

Product

Resources

About