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Kalantari MH, Abbasi B, Giti R, Rastegar Z, Tavanafar S, Shahsavari-pour S. Clinical evaluation of marginal fit of uncemented CAD-CAM monolithic zirconia three-unit restorations in anterior areas, using scannable and conventional polyvinyl siloxane impression materials. BMC Oral Health 2023; 23:52. [PMID: 36717822 PMCID: PMC9885647 DOI: 10.1186/s12903-023-02771-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Accepted: 01/27/2023] [Indexed: 01/31/2023] Open
Abstract
BACKGROUND The accuracy of impression techniques determines the marginal fit of fixed prostheses. Marginal accuracy plays a main role in the success and failure of treatments. This in-vivo study evaluated the marginal fit of anterior three-unit monolithic zirconia fixed partial dentures (FPDs) using conventional and scannable polyvinyl siloxane impression materials. METHODS Ten patients were selected to replace the lateral teeth with a three-unit monolithic zirconia bridge. For each patient, in the first group, an impression was made with a two-step putty-wash technique using scannable polyvinyl siloxane material (BONASCAN; DMP, Greece). In the identical session, as the second group, an impression of conventional putty-wash polyvinyl siloxane was taken (BONASIL A+ Putty; DMP, Greece). The marginal discrepancy was measured through the replicas, which were cut perpendicularly within the buccolingual and mesiodistal directions. An Independent t-test was employed for data analyses (P < 0.05). RESULTS The marginal discrepancy in a conventional method for central abutment in mid-buccal, mid-lingual, mid-mesial, and mid-distal was higher than in the scannable method but it was not significant (P > 0.05). Also, the marginal discrepancy for canine abutment in the conventional method was higher than in the scannable method, but it was not significant, either (P > 0.05). CONCLUSIONS FPDs fabricated from both scannable and conventional impression materials were not superior to each other in marginal fit for both central and canine abutments by evaluation using the replica technique.
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Affiliation(s)
- Mohammad Hassan Kalantari
- grid.412571.40000 0000 8819 4698Department of Prosthodontics, School of Dentistry, Shiraz University of Medical Science, Shiraz, Iran
| | - Benika Abbasi
- Department of Prosthodontics, School of Dentistry, Isfahan University of Medical Science, Isfahan, Iran.
| | - Rashin Giti
- grid.412571.40000 0000 8819 4698Department of Prosthodontics, School of Dentistry, Shiraz University of Medical Science, Shiraz, Iran
| | - Zahra Rastegar
- grid.412571.40000 0000 8819 4698Department of Periodontology, School of Dentistry, Shiraz University of Medical Science, Shiraz, Iran
| | - Saeid Tavanafar
- grid.411701.20000 0004 0417 4622Department of Oral and Maxillofacial Surgery, School of Dentistry, Birjand University of Medical Sciences, Birjand, Iran
| | - Sheila Shahsavari-pour
- grid.412571.40000 0000 8819 4698Department of Oral and Maxillofacial Surgery, School of Dentistry, Shiraz University of Medical Science, Shiraz, Iran
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Micro-computed tomography analysis of root canal morphology and thickness of crown and root of mandibular incisors in Chinese population. Clin Oral Investig 2021; 26:901-910. [PMID: 34338894 DOI: 10.1007/s00784-021-04071-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Accepted: 07/04/2021] [Indexed: 02/08/2023]
Abstract
OBJECTIVES The aim of this study was to investigate the root canal morphology and the thickness of crown and root of mandibular incisors in a Chinese subpopulation by micro-computed tomography (micro-CT). METHODS In total, 208 mandibular incisors were scanned using micro-CT. The anatomical features of the canals (canal configuration, apical constriction, foramen-to-apex distance, accessory canal vertical distribution, and canal geometrical parameters) and the thickness of the crown and root 2/3 were evaluated. RESULTS Three canal categories, labeled as Single (77.88%), Merged (15.87%), and Separated (6.25%), were summarized. The most frequent constriction type in main foramina was single constriction (42.53%). Wide and narrow diameters in a single main foramen were 0.37 ± 0.14 mm and 0.26 ± 0.07 mm, respectively. The distance from the anatomical foramen to the physiological foramen and the anatomical apex was 0.49 ± 0.20 mm and 0.36 ± 0.28 mm, respectively. During the virtual root-end resection, 97.12% of roots underwent successful resection at the 2-mm level, with the foramina visible on the resection surface. During 2-D cross-sectional analyses, the shape parameters of the root and canal showed significant positive correlation (P < 0.05). The thickest and thinnest walls were the incisal and proximal walls (P < 0.05) of the crown, respectively. The buccal walls were significantly thicker than the lingual walls on the crown (P < 0.05), whereas the lingual walls were thicker on the root 2/3 (P < 0.05). CONCLUSIONS This study provides detailed information about the root canal morphology and thickness of the crown and root of mandibular incisors in a Chinese population. An understanding of morphology can benefit endodontic treatment. CLINICAL RELEVANCE Adequate knowledge of the crown, root, and canal morphology, as well as the thickness distribution of the crown and root, is essential for successful root canal therapy and prevention of complications.
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Yu H, Chen YH, Cheng H, Sawase T. Finish-line designs for ceramic crowns: A systematic review and meta-analysis. J Prosthet Dent 2019; 122:22-30.e5. [PMID: 30782459 DOI: 10.1016/j.prosdent.2018.10.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Revised: 10/09/2018] [Accepted: 10/09/2018] [Indexed: 10/27/2022]
Abstract
STATEMENT OF PROBLEM Different finish-line designs have been advocated for tooth preparations of ceramic crowns. However, scientific evidence is lacking to help clinicians make a proper selection. PURPOSE The purpose of this systematic review and meta-analysis was to evaluate the effects of finish-line designs on the marginal and internal adaptations of ceramic crowns. MATERIAL AND METHODS This report follows the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement. The literature search was conducted in MEDLINE via the PubMed, Embase, and Web of Science databases with no publication year or language limits. In vitro studies comparing the marginal and internal adaptations of ceramic crowns with rounded shoulder and chamfer finish lines were included in the meta-analysis. RESULTS Sixteen studies were included in the qualitative synthesis and meta-analyses. Statistical analyses were conducted using the Review Manager Software. Meta-analyses were performed with random-effects models (α=.05). Ceramic crowns with rounded shoulders exhibited significantly better marginal adaptation than those with chamfers (P<.001; mean difference=-7.8; 95% confidence interval=-11.6 to -4.1). Moreover, ceramic crowns with chamfers exhibited significantly better internal adaptation than those with rounded shoulders (P=.020; mean difference=35.0; 95% confidence interval=6.5 to 63.5). CONCLUSIONS The difference in marginal adaptation of ceramic crowns using 2 finish-line designs was small, and the clinical significance was low, whereas the results of internal adaptation favored the chamfer finish line.
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Affiliation(s)
- Hao Yu
- Associate Professor, Department of Prosthodontics, School and Hospital of Stomatology, Fujian Medical University, Fuzhou, PR China; Assistant Professor, Department of Applied Prosthodontics, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan
| | - Ying-Hui Chen
- Postgraduate student, Department of Prosthodontics, School and Hospital of Stomatology, Fujian Medical University, Fuzhou, PR China
| | - Hui Cheng
- Professor and Deputy Dean, School and Hospital of Stomatology, Fujian Medical University, Fuzhou, PR China; Professor, Fujian Biological Materials Engineering and Technology Center of Stomatology, Fuzhou, PR China.
| | - Takashi Sawase
- Professor, Department of Applied Prosthodontics, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan
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Abdulla F, Khamis H, Milosevic A, Abuzayda M. Convergence angles of all-ceramic full crown preparations performed in Dubai private practice. J Clin Exp Dent 2019; 10:e1192-e1197. [PMID: 30697378 PMCID: PMC6343971 DOI: 10.4317/jced.55269] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Accepted: 10/25/2018] [Indexed: 11/18/2022] Open
Abstract
Background This study aimed to determine the degree of taper and total occlusal convergence angles (TOC) for all-ceramic bonded crown preparations carried out by private practitioners in Dubai, UAE. Material and Methods A convenience sample of all-ceramic crown preparations carried out by private dental practitioners were scanned (Carestream CS 3500) from casts and the digital images assessed. The degree of taper was measured on the axial walls of each crown preparation and the bucco-lingual and mesio-distal convergence angles subsequently calculated. Results A total of 154 dentists prepared a total of 206 crown preparations (72 anterior, 134 posterior). The mean convergence angles mesio-distally for all preparations was 24.6° (sd 11.8º), and for the bucco-lingual it was 32.6° (sd 15.3°). The mean TOC was 28.6°. In anterior preparations, the mean bucco-lingual convergence angle was 38.8° (sd 12.2°) compared to 29.3° (sd 15.5°) for posterior preparations (p<0.001). Mean mesio-distal convergence anteriorly was 20.6° (sd 10.18°) compared to 26.7° (sd 12.16°) posteriorly (p<0.001). Distal and buccal taper were significantly greater on posterior teeth (<0.001) compared to anteriors whereas lingual taper was greater on anterior teeth (p<0.001). Mesial taper was not different. Premolars had significantly lower convergence values compared to other teeth. Conclusions Bucco-lingual and mesio-distal convergence angles significantly exceeded the clinically acceptable convergence angle of between 10° and 22°. Greater axial taper is recommended for resin bonded all-ceramic crowns but reliance on adhesion in such preparations rather than parallelism may reduce retention and have increased biologic cost to pulp health. Key words:All-ceramic crown preparations, convergence angles, axial taper.
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Affiliation(s)
- Fahad Abdulla
- BDS MSc Former resident, Department of Prosthodontics, Hamdan Bin Mohamed College of Dental Medicine, Mohamed Bin Rashid University (MBRU) of Medicine and Health Sciences, Dubai, UAE
| | - Hassan Khamis
- BSc MSc DEA PhD, Department of Biostatistics, Hamdan Bin Mohamed College of Dental Medicine, Mohamed Bin Rashid University (MBRU) of Medicine and Health Sciences, Dubai, UAE
| | - Alexander Milosevic
- BDS PhD FDSRCS DRDRCS FDTF Ed, Chair and Program Director, Department of Prosthodontics, Hamdan Bin Mohamed College of Dental Medicine, Mohamed Bin Rashid University (MBRU) of Medicine and Health Sciences, Dubai, UAE
| | - Moosa Abuzayda
- DDS Dr Med Dent, Department of Prosthodontics, Hamdan Bin Mohamed College of Dental Medicine, Mohamed Bin Rashid University (MBRU) of Medicine and Health Sciences, Dubai, UAE
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Watanabe H, Kazama R, Asai T, Kanaya F, Ishizaki H, Fukushima M, Okiji T. Efficiency of Dual-Cured Resin Cement Polymerization Induced by High-Intensity LED Curing Units Through Ceramic Material. Oper Dent 2015; 40:153-62. [DOI: 10.2341/13-357-l] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
SUMMARY
Objective
This study aimed to evaluate the ability of high-intensity light-emitting diode (LED) and other curing units to cure dual-cured resin cement through ceramic material.
Methods
A halogen curing unit (Jetlite 3000, Morita), a second-generation LED curing unit (Demi, Kerr), and two high-intensity LED curing units (PenCure 2000, Morita; Valo, Ultradent) were tested. Feldspathic ceramic plates (VITABLOCS Mark II, A3; Vita Zahnfabrik) with thicknesses of 1.0, 2.0, and 3.0 mm were prepared. Dual-cured resin cement samples (Clearfil Esthetic Cement, Kuraray Noritake Dental) were irradiated directly or through one of the ceramic plates for different periods (5, 10, 15, or 20 seconds for the high-intensity LED units and 20, 40, 60, or 80 seconds for the others). The Knoop hardness test was used to determine the level of photopolymerization that had been induced in the resin cement. Data were analyzed by one-way analysis of variance and Dunnett's post-hoc test to identify test-control (maximum irradiation without a ceramic plate) differences for each curing unit (p<0.05).
Results
For all curing units, the curing conditions had a statistically significant effect on the Knoop hardness numbers (KHNs) of the irradiated cement samples (p<0.001). In general, the KHN decreased with increasing plate thickness and increased as the irradiation period was extended. Jetlite 3000 achieved control-level KHN values only when the plate thickness was 1.0 mm. At a plate thickness ≥2.0 mm, the LED units (except for PenCure 2000 at 3.0 mm) were able to achieve control-level KHN values when the irradiation time was extended. At a plate thickness of 3.0 mm, irradiation for 20 seconds with the Valo or for 80 seconds with the Demi were the only methods that produced KHN values equivalent to those produced by direct irradiation.
Conclusion
Regardless of the type of curing unit used, indirect irradiation of dual-cured resin cement through a ceramic plate resulted in decreased KHN values compared with direct irradiation. When the irradiation period was extended, only the LED units were able to achieve similar KHN values to those observed under direct irradiation in the presence of plates ≥2.0-mm thick. High-intensity LED units require a shorter irradiation period than halogen and second-generation LED curing units to obtain KHN values similar to those observed during direct irradiation.
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Affiliation(s)
- H Watanabe
- Heima Watanabe, DDS, Niigata University Graduate School of Medicine and Dental Science, Division of Cariology, Operative Dentistry and Endodontics, Department of Oral Health Science, Niigata, Japan
| | - Re Kazama
- Ryunosuke Kazama, DDS, PhD, Tokyo Medical and Dental University, Removable Partial Denture Prosthodontics, Department of Masticatory Function Rehabilitation, Division of Oral Health Sciences, Graduate School, Tokyo, Japan
| | - T Asai
- Tetsuya Asai, DDS, PhD, Kondo Dental Clinic, Aichi, Japan
| | - F Kanaya
- Fumio Kanaya, Kitashiro Dental Office, Niigata, Japan
| | - H Ishizaki
- Hiroko Ishizaki, DDS, PhD, Niigata University Medical and Dental Hospital, General Dentistry and Clinical Education Unit, Niigata, Japan
| | - M Fukushima
- Masayoshi Fukushima, DDS, PhD, Niigata University, Department of Oral Health and Welfare, Faculty of Dentistry, Niigata, Japan
| | - T Okiji
- Takashi Okiji, DDS, PhD, Niigata University Graduate School of Medicine and Dental Science, Division of Cariology, Operative Dentistry and Endodontics, Niigata, Japan
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Moslehifard E, Farid F. Single Tooth Replacement Using InCeram Resin Bonded Fixed Partial Denture: A Clinical Report. JOURNAL OF DENTISTRY (TEHRAN, IRAN) 2014; 11:106-10. [PMID: 24910683 PMCID: PMC4037259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/22/2013] [Accepted: 11/29/2013] [Indexed: 11/17/2022]
Abstract
This clinical report describes a treatment option for replacement of a missing mandibular anterior tooth using InCeram resin bonded fixed partial denture (RBFPD). The conventional approach for replacing mandibular incisors dictates the placement of either a conventional porcelain-fused-to-metal (PFM) bridge, Maryland bridge, or fiber-reinforced composite veneer bridge and several appearance-related disadvantages have been reported in the use of a prosthesis that incorporates a metal substructure. The InCeram bridge is a minimally invasive restoration and eliminates undesirable incisal graying frequently observed in metal RBFPDs. This method was successfully clinically applied to overcome shortcomings of other approaches that may require a minimal invasive technique to preserve lasting sound tooth structure.
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Affiliation(s)
- Elnaz Moslehifard
- Assistant Professor, Department of Prosthodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran,Corresponding author: E. Moslehifard, Department of Prosthodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran,
| | - Farzaneh Farid
- Assistant Professor, Dental Research Center Dentistry Research Institute, Department of Prosthodontics, Faculty of Dentistry, Tehran University of Medical Science, Tehran, Iran
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