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composite, microleakage

Thomas F McDaniel, Thomas W Sigrist, Gary M Johnson
Several manufacturers produce devices designed to warm composite resins used in restorative dentistry. Previous investigators have examined the effects of heating composite restorative resins prior to placement and polymerization. Heating has been reported to reduce viscosity, improve ease of placement, enhance monomer conversion, and reduce microleakage. The aim of the present study was to compare shear bond strengths of room temperature (22°C) and prewarmed (54°C) restorative composite resin. Extracted bovine mandibular incisors were sectioned sagittally and embedded in acrylic cylinders...
March 2018: General Dentistry
Bo Huang, Walter Siqueira, Dennis G Cvitkovitch, Yoav Finer
OBJECTIVES: To identify and characterize specific esterases from S. mutans with degradative activity toward methacrylate-based resin monomers. METHODS: Out of several putative esterases, an esterase encoded in an Open Reading Frame as SMU_118c (The National Center for Biotechnology Information, NCBI), was found to have true hydrolase activities. SMU_118c was cloned, expressed, purified and further characterized for its respective hydrolytic activity towards ester-containing nitrophenyl substrates and the universal resin monomers bis-phenyl-glycidyl-dimethacrylate (bisGMA) and triethyleneglycol dimethacrylate (TEGDMA) at neutral (7...
February 26, 2018: Acta Biomaterialia
Fahad Alkhudhairy, Mustafa Naseem, Mohammed Bin-Shuwaish, Fahim Vohra
The aim was to evaluate the influence of Er, Cr: YSGG laser therapy at different pulse frequency and power levels on the bond strength and microleakage of bleached enamel. One hundred samples were bleached using in-office whitening agent. Bleached samples were divided into six subgroups, four subgroups was based on laser application parameters (pulse frequency 50 and 30 Hz; Power 4.5 & 6 W) one subgroup was treated with bleach (B) and the other was control (no bleaching, no laser application). All specimens including control were etched with 37% phosphoric acid and composite build-ups were performed...
February 24, 2018: Photodiagnosis and Photodynamic Therapy
P Segal, V Candotto, A Ben-Amar, M Eger, S Matalon, D Lauritano, Z Ormianer
SureFil SDR is a flowable resin-based composite that allows a single incremental bulk placement. The marginal seal of SureFil SDR at the gingival margins of class II restorations located apical to the cemento-enamel-junction (CEJ) has not been adequately evaluated compared to those located occlusal to the CEJ. Forty class II cavities were prepared in human molars. The gingival margins of 20 preparations were located 0.5 mm occlusal to the CEJ, and the other 20 preparations were located 0.5 mm apical to the CEJ...
January 2018: Journal of Biological Regulators and Homeostatic Agents
Cristiane Meira Assunção, Marcelo Goulart, Tattiana Enrich Essvein, Nicole Marchioro Dos Santos, Maria Carolina Guilherme Erhardt, Adrian Lussi, Jonas de Almeida Rodrigues
To evaluate the effect of erosive challenges on the tooth- restoration interface of deciduous teeth treated with different adhesive protocols. Deciduous molars were cut mesiodistally, then embedded, abraded and polished (n=80). Samples were randomly divided according to the adhesive system used into: G1 (Adper Single Bond2®, etch-and-rinse), G2 (Universal Single Bond®, self-etching), G3 (OptibondFL®, etch-and-rinse with Fluoride) and G4 (BondForce®, self-etching with Fluoride). After standardized cavity preparation (2 mm diameter x 2 mm depth), adhesive systems were applied and samples were restored (composite resin Z350®)...
January 18, 2018: Journal of Applied Oral Science: Revista FOB
Morakot Piemjai, Spun Lenglerdphol
The purpose of this study was to evaluate the distance and/or thickness of dye penetration at enamel and cementum/dentin margins of restorations before and after vital bleaching. Class V cavities were prepared on extracted human premolars and restored with light-cured resin composite using either AQ-Bond or Single-Bond2 adhesives. Four conditions: no bleaching (control), restored before bleaching (RB), bleached and immediately restored (BIR), bleached and stored in artificial saliva for 7 days then restored (B7R), were used for each adhesive group...
December 15, 2017: Journal of Esthetic and Restorative Dentistry
Roberto Pinna, Paolo Usai, Enrica Filigheddu, Franklin Garcia-Godoy, Egle Milia
PURPOSE: To critically discuss adhesive materials and oral cariogenic biofilm in terms of their potential relevance to the failures of adhesive restorations in the oral environment. METHODS: The literature regarding adhesive restoration failures was reviewed with particular emphasis on the chemistry of adhesive resins, weakness in dentin bonding, water fluids, cariogenic oral biofilm and the relations that influence failures. Particular attention was paid to evidence derived from clinical studies...
October 2017: American Journal of Dentistry
Shahram Mosharrafian, Alireza Heidari, Pegah Rahbar
Objectives: This study aimed to assess and compare the microleakage of two bulk fill and one conventional composite in class II restorations of primary posterior teeth. Materials and Methods: This in vitro, experimental study was conducted on 60 primary mandibular second molars, which were randomly divided into three groups. Standard class II cavities were prepared in teeth and restored with 3M bulk fill composite in group 1, SonicFill bulk fill composite in group 2 and Z250 conventional composite in group 3...
May 2017: Journal of Dentistry of Tehran University of Medical Sciences
Radek Mounajjed, Thomas J Salinas, Tomas Ingr, Basel Azar
STATEMENT OF PROBLEM: The vertical marginal discrepancy of restorations can increase upon cementation, and poor marginal fit can lead to cement dissolution, marginal discoloration, microleakage, and secondary caries. The amount of increase is related to the type of luting cement used, but how lithium disilicate pressed crowns are affected by different resin cements is unclear. PURPOSE: The purpose of this in vitro study was to compare the effect of using different resin luting cements on the vertical marginal discrepancy of lithium disilicate pressed crowns...
November 15, 2017: Journal of Prosthetic Dentistry
Kanokrat Kangwankai, Sarah Sani, Piyaphong Panpisut, Wendy Xia, Paul Ashley, Haralampos Petridis, Anne Margaret Young
PURPOSE: The aim was to assess monomer conversion, dimensional stability, flexural strength / modulus, surface apatite precipitation and wear of mono / tri calcium phosphate (CaP) and polylysine (PLS)-containing dental composites. These were formulated using a new, high molecular weight, fluid monomer phase that requires no polymerisation activator. MATERIALS AND METHODS: Urethane and Polypropylene Glycol Dimethacrylates were combined with low levels of an adhesion promoting monomer and a light activated initiator...
2017: PloS One
Beheshteh Malekafzali, Mohammad Asnaashari, Fateme Javadi
Background and Objectives: Adhesive restorations have become highly popular in pediatric dentistry, and novel methods of cavity preparation with minimal patient discomfort including Er:YAG and Er,Cr:YSGG laser preparations have greatly advanced. This study aimed to compare the microleakage of composite restorations of class V cavities prepared in primary canine teeth with high-speed bur and Er:YAG and Er,Cr:YSGG lasers. Materials and Methods: This in vitro study was conducted on 30 class V cavities prepared on the buccal surfaces of primary canine teeth in three groups (n = 10) of bur preparation, Er:YAG laser and Er,Cr:YSGG laser...
September 30, 2017: Laser Therapy
Hossein Nematollahi, Ali Bagherian, Kiarash Ghazvini, Habibollah Esmaily, Mina Azadegan Mehr
Background: The aim of this study was to compare microbial microleakage of class V cavities restored with different materials and techniques using a microbial leakage assessment method. Materials and Methods: One hundred extracted, caries-free, human maxillary premolars were randomly divided into five groups. Group 1: Resin-modified glass ionomer (RMGI), Group 2: Closed sandwich with flowable composite + nanohybrid composite, Group 3: Nanohybrid composite, Group 4: Closed sandwich with RMGI + nanohybrid composite, and Group 5: Flowable composite + nanohybrid composite that were co-cured together ("snow-plow" technique)...
September 2017: Dental Research Journal
Zheng Zhu, Ya-Qin Zhu
PURPOSE: To compare and evaluate microleakage at the occlusal wall and cervical wall in Class V cavities restored with Ivoclar Tetric N Ceram Bulk Fill composite, Tetric N Flow composite and N Ceram nanocomposite. METHODS: Sixty-six extracted human maxillary premolars, which were intact and healthy, were randomly assigned into 3 groups (n=22). Standardized Class V cavities were prepared on the buccal surface of maxillary premolars. The occlusal walls of the cavities were located on the enamel and the cervical walls were located on dentin and cementum...
June 2017: Shanghai Kou Qiang Yi Xue, Shanghai Journal of Stomatology
Neslihan Celik, Merve Iscan Yapar, Numan Taşpınar, Nilgun Seven
BACKGROUND: Marginal leakage is the important factor influencing the maintenance of dental esthetic. AIM: The purpose of this study was to evaluate the relationship between the preparation techniques and type of polymerization techniques on microleakage of composite laminate veneers. MATERIALS AND METHODS: Ninety-one same sized, caries-free human maxillary central incisors were randomly assigned to 13 groups (n = 7) and were designed with four different preparation techniques (window type, feather type, bevel type, and incisal overlap type)...
July 2017: Contemporary Clinical Dentistry
Maryam Tavangar, Zahra Zohri, Hosein Sheikhnezhad, Shahrzad Shahbeig
PURPOSE: This study was undertaken to compare the micro-leakage of class V cavities restored with the newly introduced Embrace WetBond class V (EWC) composite resin and conventional Opallis composite resin. MATERIALS AND METHODS: In this in vitro study, class V cavities were prepared on 30 extracted bovine incisors, with the gingival floor and the coronal margin of the cavities 1 mm apical and coronal to the cementoenamel junction (CEJ) respectively. The cavities measured 3 mm in length, 2 mm in width, and 1...
October 1, 2017: Journal of Contemporary Dental Practice
Hamid Kermanshah, Hossein Khorsandian
BACKGROUND: One of the most important factors in restoration failure is microleakage at the restoration interface. Furthermore, a new generation of bonding, Scotchbond Universal (multi-mode adhesive), has been introduced to facilitate the bonding steps. The aim of this study was to compare the microleakage of Class V cavities restored using Scotchbond™ Universal with Scotchbond Multi-Purpose in two procedures. MATERIALS AND METHODS: Eighteen freshly extracted human molars were used in this study...
July 2017: Dental Research Journal
C Mocquot, A Cabrera, P Colon, J Bosco, B Grosgogeat, N Pradelle-Plasse
Objectives No recent study has addressed the effect of diving conditions (pressure increase) on adhesive restorations. We evaluated the impact of a simulated hyperbaric environment on microleakage of the dentine-composite resin interface. The ultimate aim was to propose recommendations for restorative dentistry for patients who are divers to limit barodontalgia (dental pain caused by pressure variations of the environment) and may lead to dangerous sequelae.Methods We bonded 20 dentine disks by using an adhesive system (Scothbond Universal) to ten intact composite cylinders and ten composite cylinders with porosity (Ceram X mono)...
September 8, 2017: British Dental Journal
Hüseyin Hatirli, Bilal Yasa, Elif Yasa
The aim of the study was to evaluate microleakage and the penetration-depths of different fissure-sealant materials applied with/without enameloplasty after cyclic aging. One-hundred-sixty mandibular molars were divided into non-invasive and enameloplasty preparation groups and eight material subgroups, including: flowable composites (microhyrid, nanohybrid, and nanofilled), three resin-based (unfilled, filled, and highly-filled), a giomer-based, and a glass-ionomer-based fissure sealant. Specimens were subjected to two-year cyclic chewing and brushing simulation...
August 25, 2017: Dental Materials Journal
Iman Ramezanian Nik, Ehsan Baradaran Naseri, Sara Majidinia, Sara Ramezanian Nik, Mohammad Jafari Giv
OBJECTIVE: To evaluate the effect of chlorhexidine and ethanol on microleakage of composite resin restoration to dentine. METHODS: Class II cavities with dentinal margin were prepared on 96 premolar teeth. All specimens were acid-etched, rinsed and dried. Then the samples were randomly divided into four groups according to pre-treatment of the dentine: no treatment (control group); treatment with 100% ethanol for 60 s (group 2); treatment with 2% chlorhexidine for 60 s (group 3); 100% ethanol for 60 s and then 2% chlorhexidine for 60 s (group 4)...
2017: Chinese Journal of Dental Research
B S Bolgul, B Ayna, I Simsek, S Celenk, O Seker, G Kilinc
AIM: To explore the microleakage of different adhesive systems and flowable composites to permanent teeth. SUBJECTS AND METHODS: In this study, a total of 84 human premolar teeth were used. Class V cavities were prepared on the buccal surfaces. The teeth were randomly assigned to six groups of 14 teeth each as follows: The first group - etch-rinse adhesive applied and cavities filled with flowable composite, the second group - etch-rinse adhesive applied and cavities filled with bulk-fill resin composite, the third group - one-stage self-etch (SE) adhesive applied and cavities filled with flowable composite, the fourth group - one-stage SE adhesive applied and cavities filled with bulk-fill resin composite, the fifth group - two-stage SE adhesive applied and cavities filled with flowable composite, and the sixth group - two-stage SE adhesive applied and cavities filled with bulk-fill resin composite...
July 2017: Nigerian Journal of Clinical Practice
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