Microleakage of Porcelain and Composite Machined Crowns Cemented with Self‐Adhesive or Conventional Resin Cement (original) (raw)
Related papers
Journal of Prosthodontics, 2010
Purpose: Resistance of machined crowns to microleakage when cemented with new self-adhesive cements has not been fully investigated. This study evaluated microleakage of machined crowns milled from porcelain and composite blocks and bonded to teeth with self-adhesive and conventional resin cement. Materials and Methods: Thirty-two freshly extracted premolars of similar shape and size were sterilized and mounted in resin blocks. Teeth received standard crown preparations with 1-mm circumferential shoulder finish line, flat occlusal surface reduced by 2 mm, and ideal angle of convergence. Prepared teeth were divided into two equal groups and assigned to either porcelain (Vita Mark II, Vident) or composite (Paradigm MZ100, 3M ESPE) blocks for crown fabrication. Optical impressions were captured for each tooth with the intraoral camera of a CEREC 3D machine. Crowns were designed and milled from both materials. Each group was then subdivided into two subgroups (n = 8) according to cement used (self-adhesive resin cement, RelyX Unicem, 3M ESPE or resin cement with self-etching adhesive, Panavia F 2.0, Kuraray). Following seating, a 5-kg weight was applied on the occlusal surface of the crown for 5 minutes. Specimens were then stored in water at 37 • C for 24 hours. Specimens were thermocycled for 3000 cycles between 5 • C and 55 • C, then coated with nail varnish and immersed in a 2.0% basic red fuchsine dye solution for 24 hours. Teeth were then rinsed and sectioned mesiodistally and assessed under magnification for microleakage. A five-point scale was used to score degree of microleakage. Data were statistically analyzed with 2-way ANOVA and Kruskal-Wallis nonparametric test. Results: Crown material had no significant effect on microleakage (p = 0.67); however, cement type had a significant effect (p < 0.0001), with Panavia F 2.0 resulting in lower microleakage scores than RelyX Unicem. Conclusions: Compared to the self-adhesive cement, the resin cement with separate primer/bonding agent resulted in significantly lower microleakage scores, irrespective of crown material.
Microleakage of various cementing agents for full cast crowns
Dental Materials, 2005
Objectives. To evaluate microleakage and marginal gaps in full cast crown restorations bonded with six different types of cementing agents. Methods. Sixty non-carious human premolars and molars were prepared in a standardized manner for full cast crown restorations. The mesial and distal margins were located in dentin, while the vestibular and palatal/lingual margins were located in enamel. Crowns were made from a high-gold alloy using a standardized technique. The specimens were randomized to six groups of cementing agents: one zincphosphate cement (Harvard cement), one conventional glass-ionomer cement (Fuji I), one resin-modified glass-ionomer cement (Fuji Plus), two standard resin cements (RelyX ARC, Panavia F), and one self-adhesive universal resin cement (RelyX Unicem). After 4 weeks of storage in distilled water at 37 8C, the specimens were subjected to 5000 thermocycles ranging from 5 to 55 8C. Then, they were placed in a silver nitrate solution, embedded in resin blocks, and vertically cut in buccolingual and mesiodistal direction. Subsequently, the objects were evaluated for microleakage and marginal gap using a high-resolution digital microscope camera. Results. A number of inter-group differences were statistically significant. RelyX Unicem showed the smallest degree of microleakage both in enamel and in dentin. Panavia F und RelyX Unicem were associated with significantly larger marginal gaps than all other cementing agents. No association was observed between microleakage and marginal gap other than a weak direct correlation when using Harvard cement on enamel. Significance. The cementing agents investigated revealed different sealing abilities. These differences were not associated with specific types of materials.
In vitro evaluation of microleakage of various types of dental cements
Srpski arhiv za celokupno lekarstvo, 2010
Introduction. Microleakage is defined as the clinically undetectable seepage of oral fluids containing bacteria and debris between cement layer and tooth restoration. Objective. This in vitro study investigated the effect of different dental cements (zinc-phosphate, polycarboxylate, glass-ionomer and resin cement) on microleakage in different ceramic crown systems (metal ceramic crown, metal ceramic crown with a porcelain margin, Empress 2 and In Ceram all-ceramic crowns) fixed on extracted human teeth. Methods. One hundred and sixty intact human premolars were randomized to four groups of forty teeth each, according to the different ceramic crown systems. They were prepared in a standardized manner for metal-ceramic and all-ceramic crowns. Crowns were made following a standard laboratory technique, and each group of crowns were divided into four groups according to the different cement agents and cemented on their respective abutments. The specimens were subjected to thermocycling,...
In Vitro Study on Marginal Microleakage of Four Temporary Cements in Provisional Crowns
International Journal of Medical and Biomedical Studies, 2019
Background: Prolonged retention of provisional restoration is depends upon the long term affinity between restoration and teeth structures which depend upon the use of good mechanical characteristics, low solubility, and superior adhesion quality of luting cement which also resist bacterial and molecular penetration. Hence, assessment of marginal leakage of provisional restorative materials sealed with provisional cements using the standardized procedures is essential. Aim: This study aimed at in vitro study of microleakage of 4 provisional cements, a cavity base compound and a zinc-phosphate luting cement in provisional acrylic resin crowns fixed on extracted human teeth. Material & Methods: The teeth with acrylic restorations were randomly divided into 6 groups of 6 specimens each. Each group received different types of temporary cement. Acrylic resin crowns were made and fitted on intact human premolars with the 4 cements. All restorations were applied in a standardized manner....
International Journal of Clinical Pediatric Dentistry
plentiful for an alpha of 0.05, power of 80%, 0.5 as effect size (estimated from an analogous study). Forty five extracted deciduous molars were selected with root resorption less than two-thirds according to the inclusion criteria. The extracted teeth were immersed in 10% formalin solution for 2 weeks for sterilization. Then the teeth were preserved in distilled water at 37°C. Firstly, a columnar acrylic block was formulated of height 1.5 cm and 1.5 cm width. Following which a rubber IntroductIon Caries is one of the leading oral issues affecting children. The consequences of untreated lesions cause pain and infection. 1 Full coronal restorations may be indicated where multiple surfaces are affected and when pulpal therapy is indicated. 2 Stainless Steel Crowns (SSC) are fitted onto respective teeth and affixed with a biologically adaptable cementing agent, 3 primarily filling voids at restoration-tooth interface. Recently, newer agents have been introduced claiming superior performance than predecessors. 4 Since scanty literature exists regarding microleakage relating to newer luting agents, the current research was attempted to compare and assessability of new adhesive luting agents to halt microleakage under SSCs on primary teeth. MaterIals a n d Methods The present study was performed in the Department of Pedodontics and Preventive Dentistry. In the current study, the ability of new adhesive cement, that is, Conventional Glass Ionomer Cement, Resin Modified Glass Ionomer luting agents, as well as Resin-based luting agents, were compared and evaluated to avert microleakage beneath stainless steel crowns on primary teeth. Sample size evaluation was done using G Power software (version 3.0). The sample size was assessed for the F test and "ANOVA: fixed effects, one way" was chosen. The lowest aggregate sample size of 45 (15 per cement group
Bangladesh Journal of Medical Science
Background: Studies on microleakage of Computer-Aided Design/Computer-Aided Manufacturing (CAD/CAM) crowns are abundant. However many of them are inconclusive, especially those using self adhesive cements. Aims: To compare the microleakage between CAD/CAM crowns milled out of feldspathic ceramic and resin nano ceramics, cemented with three resin cements. Materials and Methods: Crown preparation was made on 54 extracted human premolars. Impressions were captured optically using CEREC 3D machine intraoral camera, and crowns were milled from feldspathic ceramic (CEREC® Blocs PC, VITA) and resin nano ceramic (Lava™ Ultimate CAD/CAM Restorative, 3M ESPE) blocks. The crowns were then cemented with three cements (n = 9); RelyX™ U200 Self-Adhesive Resin Cement (3M ESPE); NX3 Nexus ® cement with two-step etch-and-rinse adhesive (Kerr Corporation) or three/multistep etch-and-rinse resin cement, Variolink® II/Syntac Classic (Ivoclar Vivadent). The specimens were kept in water for 24 hours, the...
2018
Aims: To compare microleakage in three core materials (Multicore Flow, Fuji IX and Ketac Silver) with conventional and unconventional placement of crown margins. Methods and Material: Sixty extracted human premolars were selected for the study. The teeth were divided into three main groups of 20 each for three materials tested. A large class II cavity extending up to the cemento-enamel junction were prepared on the teeth and then restored with the core materials respectively. Then each tooth was prepared to receive a PFM crown of which 10 samples in each group were prepared with conventional placement of crown margins and in the other 10 samples the margins were placed on the core material. Later the crowns were cemented with Rely X U 200 luting cement. The cemented samples were subjected to mechanical loading and thermocycling followed by the immersion of the samples in 0.5% aqueous Basic Fuschin solution for 8 hours for three days. Later the samples were sectioned mesio-distally u...
Influence of marginal fit and cement types on microleakage of all-ceramic crown systems
Brazilian Oral Research, 2011
The purpose of this study was to evaluate the effects of both marginal fit and cementing with different luting agents on the microleakage of all-ceramic crown systems. Thirty-six extracted upper central incisors were prepared for full-coverage crowns and were divided into three groups. Group 1: CAD/CAM-fabricated ZrO 2 , Group 2: Heatpressed lithium-disilicate, and Group 3: Cast Cr-Co copings as the control group. Copings were made following standard techniques, and groups were assigned cementation with either self-adhesive resin cement (A) or glass-ionomer luting cement (B). The specimens were subjected to thermocycling, immersed in basic fuchsin solution, sectioned mesiodistally and buccolingually. The surface of each section was digitally photographed under a stereomicroscope. Microleakage was scored using a five-point scale, and the marginal gap was measured using image analysis software. Data were statistically analyzed using 2-way ANOVA, Kruskal-Wallis, and Mann-Whitney U tests (α: 0.05). The marginal discrepancy of each group was 82.7 ± 7 µm, 92.6 ± 4 µm and 96.5 ± 7 µm respectively. Group 1 showed significantly smaller gaps than Group 3 (P = 0.042). Self-adhesive resin cement (A) showed a lower level of microleakage than glass-ionomer luting cement (B) in all groups (P = 0.029). Microleakage scores of '0' were 83% for 1A, 50% for 1B, 50% for 2A, 16% for 2B, 33% for 3A and none for 3B. Marginal discrepancy and cement type both had significant effects on microleakage. Lower levels of microleakage were recorded with self-adhesive resin cement, while CAD/ CAM-fabricated ZrO 2 copings showed smaller marginal discrepancy and less microleakage in comparison to cast Cr-Co.
Egyptian dental journal, 2016
Aim of the study: This study was directed to evaluate the microleakage of different types of composite resin in class II posterior restoration at the cement-enamel junction CEJ. Materials and methods: Eighty one freshly extracted molars were selected. The teeth were divided into three main groups (27 each) according to the material used. Group 1: samples were restored with packable resin composite. Group 2: samples were restored with packable resin composite lined with 1-1.5mm layer of flowable resin composite. Group 3: samples were restored with hybrid resin composite. Each group was divided into three subgroups (9 each) according to the storage time. Subgroup A, B and C: storage time was 24 hours, 1 month and 3 months respectively. The gingival margin was located at the CEJ. The teeth were restored and microleakage testing was performed using dye penetration method. The data were collected and statistically analyzed. Results: The packable composite group recorded the highest microleakage values followed by hybrid composite group then flowable-lined packable composite group and this was statistically with high significance (p<0.001). The three groups showed the least microleakage values after one month followed by three months storage while the highest values were after 24 hours storage. Conclusion: None of the tested materials was able to completely eliminate marginal microleakage at CEJ but the use of flowable resin composite as a liner under packable resin composite showed a reduction in microleakage compared to the other types.
Journal of dental problems and solutions, 2019
The aim of this randomized in vitro study is to clarify whether resin based restorative materials (RBRM) behave in a way comparable to non-resin based restorative materials (non-RBRM) in dentinelimited cavities with regard to their marginal fi t. For this purpose, cylindrical standardized cavities (diameter: 3.0 +/-0.1 mm, depth: 1.5 mm) were placed on buccal surfaces of sixty human molars and restored with three non-RBRM (glass ionomer cement, amalgam, phosphate cement) and three adhesive (composite, compomer, ormocer) restoratives. Aging of the samples was achieved by thermal cycling (500 cycles). The marginal gaps could be made visible with a dye penetration test (methylene blue 2%). Using a diamond internal hole saw, 5 cuts were made through the cavity and measured under an incident light microscope at 10x magnifi cation. The result of the statistical evaluation of the additionally determined percentage marginal gap depths was compared with the numerical evaluation of the penetration depths of 0, 1 and 2 required by the ISO test setup. The ISO classifi cation reveals statistical differences in the penetration behaviour of phosphate cement to the other materials, whereas the statistical evaluation of the percentage measurement distances revealed signifi cant differences between the nonadhesive and the adhesive restorative materials, with signifi cantly smaller marginal gaps for the cavities of the RBRM group.