Influence of different convergence angles and tooth preparation heights on the internal adaptation of Cerec crowns

Mou, Shu-Hui; Chai, Tsongi; Wang, Juo-Song; Shiau, Yuh‐Yuan

doi:10.1067/mpr.2002.122011

Cited by 71 publications

(61 citation statements)

References 17 publications

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“…Measurements were performed at 60 different points 3) across the entire circumference of each restoration, using a laser microscope (1LM21W, Lasertec Inc, Kanagawa, Japan) at a magnification of 250. Internal adaptation of the copings and crowns was evaluated by measuring the internal space width using a cement space replica technique 2,4,5) . The inner surface of each restoration was filled with a test-fit silicone paste (Fit Checker, GC), then seated on the master die with finger pressure.…”

Section: Marginal and Internal Adaptation Evaluationsmentioning

confidence: 99%

“…Numerous studies have evaluated the marginal and internal adaptation of single-tooth crown restorations fabricated from various systems and materials [1][2][3][4][5] . Factors such as type of finish line design, ceramic firing effect, and materials used reportedly influence the marginal adaptation of all-ceramic crown restorations [6][7][8][9][10] .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Marginal and Internal Adaptation of Zirconium Dioxide Ceramic Copings and Crowns with Different Finish Line Designs

et al. 2007

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The present study evaluated the marginal and internal adaptation of single-tooth zirconium dioxide (ZrO2) ceramic copings or crowns with three different finish line designs. Twenty-four steel dies were prepared for maxillary central incisor crowns with the following finish line designs: shoulder (S), rounded shoulder (RS), and chamfer (C) preparations. Twenty-four standardized ZrO2 ceramic copings were manufactured with a CAD/CAM system (Cercon Smart Ceramics), and the crowns were finalized by veneering with a feldspathic ceramic. Measurements for marginal and internal adaptation were performed at two stages: the copings and the completed crowns. No significant differences were observed between the three groups in terms of marginal discrepancy median value: S, 73/69; RS, 61/60; C, 64/55 (μm). However, significant differences in internal adaptation were widely found among all groups: S, 117/111; RS, 72/75; C, 56/57 (μm). As for intra-group comparisons of marginal and internal adaptation values for all groups, the differences were not significant. It was found that the finish line design seemingly wielded no influence on marginal adaptation of single-tooth ZrO2 ceramic copings and crowns. It was also observed that the marginal and internal adaptation values in the present study were all within the clinically acceptable range.

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Section: Marginal and Internal Adaptation Evaluationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Marginal and Internal Adaptation of Zirconium Dioxide Ceramic Copings and Crowns with Different Finish Line Designs

et al. 2007

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“…Accordingly, Mou et al 5 detected only a slight difference in misfi t between 12° and 20° angled abutments, which they attributed to scanning error. However, Zhao et al 11 registered the best marginal seal when the convergence angle of the abutments was 20°.…”

Section: Discussionmentioning

confidence: 97%

“…[1][2][3] However, even though marginal discrepancies may lead to secondary caries, periodontal diseases, debonding, or mechanical failure of cemented restorations, [4][5][6] few studies of posterior zirconia bridges have been conducted. 3,4,[6][7][8] Vertical gaps may be introduced during either fabrication step, including during computer-aided design (CAD)/ computer-aided manufacturing (CAM) digitization.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of fit of zirconia posterior bridge structures constructed with different scanning methods and preparation angles

2010

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This study evaluated the influence of scanning method, abutment position, and preparation angle on the vertical seal of three-unit posterior zirconia structures. Sixty differently angled metallic models were machined to receive 30 bridge frameworks. For each preparation type, half of the structures were waxed-up and digitized, whereas the other half were computer-designed after the abutments were scanned. Once milled, the samples were cemented in standard fashion. Misfit was assessed by scanning electron microscopy. Three-way analysis of variance showed significant differences. Computer-designed structures achieved the highest accuracy (P< 0.0001). No significant differences were recorded concerning the abutment position and convergence angle. All discrepancy values were within the clinically acceptable range.

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“…Is› ile preslenen tam seramik kronlarda boyama tekniğinin avantaj› kronlar›n tabakalama tekniğine göre daha kal›n kor yap› içermesi ve teknisyen taraf›ndan mum modelajla oluşturulan kron formunun daha kolay ve daha hassas olarak şekillendirilmesidir. Buna karş›n, boyama tekniği ile elde edilen kronlar›n dezavantaj› kor yap›n›n tek renk olmas› ve kal›nl›ğ›na bağl› olarak tabakalama tekniği ile k›yasland›ğ›nda doğal diş renginin elde edilmesinde problem yaşanmas›d›r (13 Marjinal uyumla ilgili yap›lan çal›şmalar incelendiğinde mikroskop yard›m›yla, marjinal aç›kl›ğ›n kronlar›n kesit al›n›ş şekillerine göre çevresel, labio-lingual yada mesio-distal olarak direkt kronlar üzerinde (14)(15)(16)(17)(18)(19)(20)(21), yada silikon kopyalama tekniği (7,(22)(23)(24) ile ölçüldüğü görülmektedir.…”

Section: Introductionunclassified

Isi İle Preslenen Farkli Tam Serami̇k Kronlarin Marji̇nal Uyumlarinin i̇n Vi̇tro Olarak Değerlendi̇ri̇lmesi̇

Berksun¹

2007

Ankara Üniversitesi Diş Hekimliği Fakültesi Dergisi

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The aim of this in vitro study was to compare the marginal fit of 3 different heat-pressed allceramic crown systems (Creapress, IPS Empress and Finesse) both staining and layering techniques and porcelain-fused-to-metal restorations (PFM) utilizing with the silicone replica technique and an image analysis system. A total of 70 crowns were prepared for 7 groups (n=10) on metal dies, representing the maxillary right central incisor. Measurements of marginal fit were performed at 2 points for each crown using the silicone replica technique and an image analysis system. One-way analysis of variance and paired t test were used to compare data (a=0.05).The average marginal opening of the tested groups ranged from 32.4 ± 13.3 to 52.6 ± 14.8 µm. Analysis revealed that there were no significant differences in the mean marginal opening among the groups (p > 0.05). The marginal fits of crowns are not influenced by different heat-pressed all-ceramic systems. The marginal openings of all tested groups were less than the clinically acceptable limit of 120µm.

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Influence of different convergence angles and tooth preparation heights on the internal adaptation of Cerec crowns

Cited by 71 publications

References 17 publications

Marginal and Internal Adaptation of Zirconium Dioxide Ceramic Copings and Crowns with Different Finish Line Designs

Marginal and Internal Adaptation of Zirconium Dioxide Ceramic Copings and Crowns with Different Finish Line Designs

Evaluation of fit of zirconia posterior bridge structures constructed with different scanning methods and preparation angles

Isi İle Preslenen Farkli Tam Serami̇k Kronlarin Marji̇nal Uyumlarinin i̇n Vi̇tro Olarak Değerlendi̇ri̇lmesi̇

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