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Santana MLC, Paiva LFS, Carneiro VSM, Gomes ASL, Cenci MS, Faria-E-Silva AL. Fracture resistance of extensive bulk-fill composite restorations after selective caries removal. Braz Oral Res 2020; 34:e111. [PMID: 32876124 DOI: 10.1590/1807-3107bor-2020.vol34.0111] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Accepted: 07/10/2020] [Indexed: 11/22/2022] Open
Abstract
This study evaluated the effect of selective carious tissue removal on the fracture strength and failure mode of composite restorations in molars presenting only the buccal cusps. Deep cavities were prepared on the occlusal surface, and the lingual cusps were removed. Carious lesions in the middle of the pulpal wall were artificially induced with acetic acid (pH = 4.5) for 35 days. The demineralized dentin was left intact or was completely removed prior to restoration with a bulk-fill composite (n = 10). Images of the specimens were obtained by optical coherence tomography (OCT) before and after the caries induction/removal. The mechanical resistance to fracture by axial compressive loading and the failure type and extension were determined. The pulpal wall/composite interface of the fractured specimens was analyzed by OCT. The data were analyzed for significance with t-tests (α = 0.05). The deepest cavities and a more frequent occurrence of pulpal exposure were observed more often for non-selective carious tissue removal. The protocol of carious tissue removal did not affect the fracture strength (p = 0.554). An increased occurrence of catastrophic failures involving the roots was observed for non-selective carious tissue removal. Some occurrences of restoration displacement or cracks throughout the resin-dentin were observed only for the selective carious tissue approach. Selective carious tissue removal is a feasible approach to extensively damaged teeth since it reduced the occurrence of pulpal exposure and root fractures, without compromising the fracture strength.
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Affiliation(s)
| | | | | | | | - Maximiliano Sérgio Cenci
- Graduate Program in Dentistry, School of Dentistry, Universidade Federal de Pelotas, Pelotas, RS, Brazil
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Silva PFD, Oliveira LRS, Braga SSL, Signori C, Armstrong SR, Soares CJ, Cenci MS, Faria-E-Silva AL. Effect of selective carious tissue removal on biomechanical behavior of class II bulk-fill dental composite restorations. Dent Mater 2018; 34:1289-1298. [PMID: 29793795 DOI: 10.1016/j.dental.2018.05.014] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Revised: 04/25/2018] [Accepted: 05/10/2018] [Indexed: 11/17/2022]
Abstract
OBJECTIVES This study aimed to develop a method to induce carious lesions in the pulpal floor dentin of a class II cavity preparation, and to determine the effects of this carious lesion on the biomechanical behavior of the dental composite restoration. METHODS The pulpal floor dentin of class I cavities in sound third molars were demineralised with acetic acid for 35days followed by a 7-day exposure to pooled human saliva biofilm and demineralization was verified by micro-CT. Subsequently, the proximal walls were removed forming a class II cavity and the caries lesion was left intact or was completely removed prior to restoration with a bulk-fill dental composite (n=10). Cuspal deflection was assessed by strain-gauge and micro-CT imaging. The presence of enamel cracks was assessed by transillumination before and after restoration, and again after 1,200,000 cycles of mechanical fatigue in a chewing simulator. Finally, resistance to fracture by axial compressive loading and failure mode was determined. Data were analyzed by 2-way repeated measures ANOVA, Fisher's exact test, and t-test (α=0.05). RESULTS The presence of carious lesions had no significant effect upon cuspal deflection, formation of enamel cracks, and fracture strength of the dental composite restorations. The restorative procedure increased the number of enamel cracks, which was not affected by mechanical cycling. SIGNIFICANCE Maintaining carious lesions does not affect the biomechanical behavior of class II restorations performed with bulk-fill dental composite.
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Affiliation(s)
- Paula Fernanda Damasceno Silva
- Graduate program in Dentistry, Federal University of Sergipe, Rua Claudio Batista s/n, Sanatorio, Aracaju, SE, 49060-100, Brazil.
| | - Lais Rani Sales Oliveira
- Graduate program in Dentistry, Dental School, Federal University of Uberlândia,Av. Pará 1720, Bloco 4LA, Campus Umuarama, Uberlândia, MG, 38400-902, Brazil.
| | - Stella Sueli Lourenço Braga
- Graduate program in Dentistry, Dental School, Federal University of Uberlândia,Av. Pará 1720, Bloco 4LA, Campus Umuarama, Uberlândia, MG, 38400-902, Brazil.
| | - Cácia Signori
- Graduate program in Dentistry, Dental School, Federal University of Pelotas, Rua Gonçalves Chaves 457, sala 505, Pelotas, RS, 96015-560, Brazil.
| | - Steve R Armstrong
- Department of Operative Dentistry, College of Dentistry and Dental Clinics, University of Iowa,S-244A Dental Science Building, Iowa City, IA, 52242, USA.
| | - Carlos José Soares
- Department of Restorative Dentistry, Dental School, Federal University of Uberlândia, Av. Pará 1720, Bloco 4LA, Campus Umuarama, Uberlândia, MG, 38400-902, Brazil.
| | - Maximiliano Sérgio Cenci
- Department of Operative Dentistry, College of Dentistry and Dental Clinics, University of Iowa,S-244A Dental Science Building, Iowa City, IA, 52242, USA.
| | - André Luis Faria-E-Silva
- Department of Dentistry, Federal University of Sergipe, Rua Claudio Batista s/n, Sanatorio, Aracaju, SE, 49060-100, Brazil.
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Bayram E, Bayram HM. Fracture resistance of immature teeth filled with mineral trioxide aggregate, bioaggregate, and biodentine. Eur J Dent 2016; 10:220-224. [PMID: 27095900 PMCID: PMC4813439 DOI: 10.4103/1305-7456.178310] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Objective: The purpose of this study was to evaluate fracture resistance of teeth with immature apices treated with coronal placement of mineral trioxide aggregate (MTA), bioaggregate (BA), and Biodentine. Materials and Methods: Forty-one freshly extracted, single-rooted human premolar teeth were used for the study. At first, the root length was standardized to 9 mm. The crown-down technique was used for the preparation of the root canals using the rotary ProTaper system (Dentsply Maillefer, Ballaigues, Switzerland) of F3 (30). Peeso reamer no. 6 was stepped out from the apex to simulate an incompletely formed root. The prepared roots were randomly assigned to one control (n = 5) and three experimental (n = 12) groups, as described below. Group 1: White MTA (Angelus, Londrina, Brazil) was prepared as per the manufacturer's instructions and compacted into the root canal using MAP system (Dentsply Maillefer, Ballaigues, Switzerland) and condensed by pluggers (Angelus, Londrina, Brazil). Group 2: The canals were filled with DiaRoot-BA (DiaDent Group International, Canada). Group 3: Biodentine (Septodont, Saint Maur des Fosses, France) solution was mixed with the capsule powder and condensed using pluggers. Instron was used to determine the maximum horizontal load to fracture the tooth, placing the tip 3 mm incisal to the cementoenamel junction. Mean values of the fracture strength were compared by ANOVA followed by a post hoc test. P < 0.05 was considered statistically significant. Results: No significant difference was observed among the MTA, BA, and biodentine experimental groups. Conclusion: All the three materials tested, may be used as effective strengthening agents for immature teeth.
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Affiliation(s)
- Emre Bayram
- Department of Endodontics, University of Gaziosmanpaşa, Tokat, Turkiye
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