Oral Biofilm on Dental Materials Among Khat Chewers

2020 ◽  
Vol 21 (10) ◽  
pp. 964-972
Author(s):  
Mohammed M. Al Moaleem ◽  
Amit Porwal ◽  
Nasser M. Al Ahmari ◽  
Mansoor Shariff
Keyword(s):  
Bacterial Species ◽  
Dental Materials ◽  
Bacterial Biofilm ◽  
Glass Ionomer ◽  
Oral Biofilm ◽  
Significant Difference ◽  
All Ceramic ◽  
Metal Ceramic ◽  
Restorative Materials ◽  
Khat Chewer

Background: Nowadays khat chewing habit is increasing among population in southern part of Saudi Arabia, Jazan and till date there is no literature investigating the effect of khat on oral biofilm on dental materials. Objective: To evaluate and compare the bacterial biofilm on different types of dental restorative materials used in replacing missing tooth structures among khat chewers and non-khat chewers. Materials and Methods: Hundred and twenty biofilm samples were collected from different dental restorations, such as All-ceramic (AL), Metal Ceramic (MC), Metal crowns or bridges (M), Composite (C), Glass Ionomer (GI) and Amalgam (A) restorations in non-khat and khat chewers (K). DNA extraction was done and subjected to PCR. Bacterial species, such as Streptococcus, Neisseria, Bacillus, Granulicatella and Veillonella were identified and counted. PCR products were also sequenced to detect similarity. Association between bacterial type and dental materials among non-khat and khat chewers were tested with Chi-Square test (Fishers Exact test). Results: he frequency and percentage of Streptococcus species were marginally higher among khat chewers (42; 70%) compared with non-khat chewers (38; 63.3%) group. But the Veillonella species were higher among non-khat chewers (9: 15%), compared to the khat chewers group (7; 11.7%). No statistically significant difference was detected among species in both groups. In non-khat and khat chewer group, the maximum hits were related to Streptococcus spp. in glass ionomer, amalgam, and composite (restorative materials), followed by metal ceramic and metal (prosthetic materials). Veillonella spp. showed maximum hits in the metal group among non-khat chewers and in all-ceramic among khat chewers. Statically significant differences were recorded among composite and amalgam samples with p values 0.047 and 0.036 in khat chewer group. Conclusion: Khat chewers showed statistically significant differences in oral biofilm in the composite and amalgam restorative materials, but there were no significant differences found among any materials and species between the groups.

scholarly journals Effect of Incisal Porcelain Veneering Thickness on the Fracture Resistance of CAD/CAM Zirconia All-Ceramic Anterior Crowns

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Noha Badran ◽  
Sanaa Abdel Kader ◽  
Fayza Alabbassy
Keyword(s):  
Fracture Resistance ◽  
Testing Machine ◽  
Mode Iii ◽  
Nickel Chromium ◽  
Significant Difference ◽  
All Ceramic ◽  
Metal Ceramic ◽  
Cad Cam ◽  
Ceramic Crown

Statement of Problem. In some clinical situations, the vertical length of either a prepared tooth or an implant abutment is short, while the occlusal clearance to be restored by a porcelain crown is large. Incisal thickness of the veneering porcelain should be considered to prevent mechanical failure of the crown. Purpose. The aim of this study is to evaluate the effect of two different incisal veneering porcelain thickness on the fracture resistance of the anterior all-ceramic CAD/CAM zirconia crown system as compared with the conventionally used metal ceramic crown system. Method. CAD/CAM zirconia all-ceramic and metal ceramic crowns were fabricated on the prepared dies with standardized dimensions and designs using standardized methods according to the manufacturer’s instructions. All crowns were then adhesively luted with resin-based cement (Multilink cement system), subjected to thermal cycling and cyclic loading, and were loaded until fracture using the universal testing machine to indicate the fracture resistance for each crown material in each veneering thickness. Results. Statistical analysis was carried out, and the results showed that the fracture resistance of the nickel-chromium metal ceramic group was significantly higher than that of the CAD/CAM zirconia all-ceramic group. Also, the fracture resistance of crowns with 1.5 mm incisal veneering thickness was significantly higher than those with 3 mm incisal veneering thickness in both groups. Furthermore, there was no significant difference in the fracture mode of the two groups where 50% of the total specimens demonstrated Mode II (veneer chipping), while 35% demonstrated Mode I (visible crack) and only 15% demonstrated Mode III (bulk fracture). Conclusion. High failure load values were demonstrated by the specimens in this study, which suggest sufficient strength of both incisal veneering thickness in both crown systems to withstand clinical applications; however, the fracture patterns still underline the requirement of a core design that support a consistent thickness of the veneering ceramic, and it is recommended to conduct long-term prospective clinical studies to confirm findings reported in the present study.

Properties of New Glass-Ionomer Restorative Systems Marketed for Stress-Bearing Areas

2020 ◽  
Vol 45 (1) ◽  
pp. 104-110 ◽  
Author(s):  
D Fuhrmann ◽  
D Murchison ◽  
S Whipple ◽  
K Vandewalle
Keyword(s):  
Fracture Toughness ◽  
Composite Resin ◽  
Testing Machine ◽  
Surface Hardness ◽  
Glass Ionomer ◽  
Hardness Tester ◽  
Resin Coating ◽  
Significant Difference ◽  
Restorative Materials ◽  
Post Hoc

SUMMARY Objectives: The purpose of this study was to evaluate the properties (fracture toughness, surface hardness) of newer conventional glass-ionomer restorative materials that are marketed for posterior stress-bearing areas compared with more traditional glass-ionomer restorative materials marketed for non–load-bearing areas and composite-resin restorative materials. Methods and Materials: Notched-beam fracture toughness specimens were created in a mold with each tested material (Equia Forte, GC America, with and without a surface coating of Equia Forte Coat; Ketac Universal, 3M/ESPE; ChemFil Rock, Dentsply; Fuji IX GP Extra, GC; Ionostar Molar, VOCO; Filtek Z250, 3M/ESPE; Filtek Supreme Ultra, 3M/ESPE) and fractured using a universal testing machine after 24 hours of storage. Hardness values were determined on the surface of the fracture toughness specimens using a hardness tester. Data were analyzed with a one-way ANOVA and Tukey's post hoc test per property (alpha=0.05). Results: The composite-resin restorative materials had significantly greater fracture toughness than the glass-ionomer materials. There was no significant difference in fracture toughness between the glass-ionomer materials. The use of a resin coating significantly increased the surface hardness of the newer glass ionomer marketed for stress-bearing areas. Conclusions: Fracture toughness was not improved with the newer glass-ionomer restorative materials marketed for stress-bearing areas compared to the conventional glass-ionomer materials, however a resin coating provided greater surface hardness.

The Weight Change of Various Light-Cured Restorative Materials Stored in Water

2005 ◽  
Vol 6 (2) ◽  
pp. 72-79 ◽  
Author(s):  
Filiz Yalcin
Keyword(s):  
Weight Change ◽  
Glass Ionomer ◽  
Weight Changes ◽  
Short Term ◽  
Composite Cement ◽  
Long Term Storage ◽  
Significant Difference ◽  
Restorative Materials ◽  
Term Storage

Abstract This study investigated weight changes of seven different light-cured composite restorative materials, one polyacid glass ionomer compomer, and one light-cured glass-ionomer cement following short-term and long-term storage in water. Two packable composites, three universal (hybrid) composites, one microglass composite, one polyacid glass ionomer resin composite (compomer), one microhybrid low-viscosity (flowable) composite, and one light cured glass ionomer composite cement were evaluated in this study. The weight changes of these specimens were measured daily (short-term storage), and they were measured after six weeks (long-term storage) using an electronic analytical balance. A significant difference was found in Ionoliner, Dyract AP, Opticor flow, Charisma, and Solitare 2, but no significant difference was found in the others (Filtek Z 250, Filtek P60, TPH Spectrum, and Valux Plus). Weight change showed a tendency to increase with the time of water storage. The greatest weight change occurred in light-cured glass ionomer composite cement (Ionoliner), which is followed in order by the weight changes in Dyract AP, Opticor Flow, Charisma, Solitare 2, Filtek Z250, Filtek P60, TPH Spectrum; Valux Plus had the least amount of change. Citation Keyf F, Yalcin F. The Weight Change of Various Light-Cured Restorative Materials Stored in Water. J Contemp Dent Pract 2005 May;(6)2:072-079.

A New Chemical Device Based on Silver and Cationic Surfactents as an Adjunct of Domestic Oral Hygiene. A Single Blind Study on Periodontal Patients

2018 ◽  
Author(s):  
Dorina Lauritano ◽  
Valentina Candotto ◽  
Francesco Carinci ◽  
Carlo Alberto Bignozzi ◽  
Daniele Pazzi ◽  
...  
Keyword(s):  
Oral Hygiene ◽  
Bacterial Species ◽  
Strong Reduction ◽  
Oral Biofilm ◽  
Radiographic Evidence ◽  
Significant Difference ◽  
Microbial Analysis ◽  
Polymerase Chain ◽  
Single Blind ◽  
Total Bacteria

The indication for using chemical devices as an adjunct of domestic oral hygiene has become increasly used in last decades, usually following mechanical instrumentation. The efficacy of chemical devices for oral biofilm control is proven by evidence from clinical studies. The purpose of this study was to assess the effect of a new oral gel named ADC to reduce oral bacterial loading investigated by means of Polymerase Chain Reaction (PCR). Materials and methods: A total of 10 patients with a diagnosis of chronic periodontitis in the age group >25 years, were selected. None of these patients had received any surgical or non-surgical periodontal therapy and demonstrated radiographic evidence of moderate bone loss. Four sites in separate quadrants were selected in each patient for testing the efficacy of the new medical device. Microbial analysis (MA) was performed at baseline and at day 15. Paired T-Test was used to detect statistical significant reduction of total bacterial loading and specific bacteria. The results showed statistically significant reduction of the overall bacterial loading from baseline to day 15. Results: Specimens of subgingival plaque from a total of patients were investigated for the presence of “red complex” bacterial species by quantitative PCR. The total amount of bacteria detected a statistically significant difference was detected between total bacterial loading pre and post treatment. Total bacteria loading was significant statistically reduced of about 87%, (p = 0.029). Conclusion: In this study, a strong reduction of total bacterial loading using ADC gel as an adjunct to oral home care was observed.

scholarly journals Effect of Luting Cements On the Bond Strength to Turkom-Cera All-Ceramic Material

2018 ◽  
Vol 6 (3) ◽  
pp. 548-553 ◽  
Author(s):  
Bandar M. A. Al–Makramani ◽  
Abdul A. A. Razak ◽  
Mohamed I. Abu–Hassan ◽  
Fuad A. Al–Sanabani ◽  
Fahad M. Albakri
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
Glass Ionomer Cement ◽  
Resin Cement ◽  
Glass Ionomer ◽  
Luting Cement ◽  
Significant Difference ◽  
All Ceramic ◽  
Ionomer Cement

BACKGROUND: The selection of the appropriate luting cement is a key factor for achieving a strong bond between prepared teeth and dental restorations.AIM: To evaluate the shear bond strength of Zinc phosphate cement Elite, glass ionomer cement Fuji I, resin-modified glass ionomer cement Fuji Plus and resin luting cement Panavia-F to Turkom-Cera all-ceramic material.MATERIALS AND METHODS: Turkom-Cera was used to form discs 10mm in diameter and 3 mm in thickness (n = 40). The ceramic discs were wet ground, air - particle abraded with 50 - μm aluminium oxide particles and randomly divided into four groups (n = 10). The luting cement was bonded to Turkom-Cera discs as per manufacturer instructions. The shear bond strengths were determined using the universal testing machine at a crosshead speed of 0.5 mm/min. The data were analysed using the tests One Way ANOVA, the nonparametric Kruskal - Wallis test and Mann - Whitney Post hoc test.RESULTS: The shear bond strength of the Elite, Fuji I, Fuji Plus and Panavia F groups were: 0.92 ± 0.42, 2.04 ± 0.78, 4.37 ± 1.18, and 16.42 ± 3.38 MPa, respectively. There was the statistically significant difference between the four luting cement tested (p < 0.05).CONCLUSION: the phosphate-containing resin cement Panavia-F exhibited shear bond strength value significantly higher than all materials tested.

scholarly journals Protection Offered by Root-surface Restorative Materials against Biofilm Challenge

2007 ◽  
Vol 86 (5) ◽  
pp. 431-435 ◽  
Author(s):  
H.K. Yip ◽  
J. Guo ◽  
W.H.S. Wong
Keyword(s):  
Resin Composite ◽  
Glass Ionomer Cement ◽  
Root Surface ◽  
Glass Ionomer ◽  
Streptococcus Sobrinus ◽  
Oral Biofilm ◽  
Artificial Mouth ◽  
Restorative Materials ◽  
Root Surfaces ◽  
Ionomer Cement

The prevalence of root-surface caries is increasing. We hypothesized that some restorative materials are protective against cariogenic challenge on root surfaces. Our goal was to study the effects of different restorative materials on root surfaces incubated with an oral biofilm generated in an artificial mouth. A biofilm of Streptococcus mutans, Streptococcus sobrinus, Lactobacillus rhamnosus, and Actinomyces naeslundii was co-cultured for 21 days on 24 glass-ionomer cement, resin-modified glass-ionomer cement, or resin-composite-restored root surfaces. These surfaces were then examined with Fourier transform infrared spectroscopy and scanning electron energy-dispersive spectroscopy. Only glass-ionomer restorations showed a significant increase in log calcium-to-phosphorus ratio (P < 0.01), and a significantly lower log amide I-to-hydrogen phosphate ratio on the root surface after incubation in the artificial mouth. Glass-ionomer restoratives conferred a preventive effect on the root surfaces against initial cariogenic challenge with a mixed-species oral biofilm without therapeutic intervention.

scholarly journals Time-dependent Variation in Compressive Strengths of Three Posterior Esthetic Restorative Materials: An in vitro Study

2016 ◽  
Vol 6 (3) ◽  
pp. 63-65
Author(s):  
Anjna Sharma ◽  
Pankaj Mishra
Keyword(s):  
Testing Machine ◽  
Glass Ionomer Cement ◽  
In Vitro Study ◽  
Composite Resins ◽  
Time Dependent ◽  
Glass Ionomer ◽  
Significant Difference ◽  
Resin Modified Glass Ionomer ◽  
Restorative Materials

ABSTRACT Aim To compare the compressive strengths of composite resins and resin-modified glass ionomer cements (RMGICs) at different times. Materials and methods A total of 36 samples were prepared, 12 samples of each group, composite resins Filtek Z 250, Filtek Z 350, and resin-modified glass ionomer cement. Compressive strengths of specimens were measured after 1, 24 hours, and 7 days. Test was carried out on a “Universal Testing Machine” with cross-head speed of 5 mm/min. Results There was a significant difference between all the three restorative materials. Analysis of variance showed that mean compressive strengths of Z 250 after 1, 24 hours were higher than Z 350 and RMGIC (p < 0.05). The mean compressive strengths were reduced after 7 days in all the three groups, but after 7 days, the values of Z 250 when compared with the Z 350 and RMGIC were higher. Conclusion The study demonstrated that compressive strengths of hybrid composite resins (Z 250) were significantly higher than that of nanocomposites (Z 350) and RMGIC. How to cite this article Sharma A, Mishra P, Mishra SK. Time-dependent Variation in Compressive Strengths of Three Posterior Esthetic Restorative Materials: An in vitro Study. Int J Prosthodont Restor Dent 2016;6(3):63-65.

scholarly journals Testing Sealing Properties of Restorative Materials Against Moist Dentin

1987 ◽  
Vol 66 (12) ◽  
pp. 1758-1764 ◽  
Author(s):  
L.G. Terkla ◽  
A.C. Brown ◽  
A.P. Hainisch ◽  
J.C. Mitchem
Keyword(s):  
Composite Resin ◽  
Dental Materials ◽  
Human Tooth ◽  
Laboratory System ◽  
Filling Material ◽  
Glass Ionomer ◽  
Buffer Solution ◽  
Bonding Agents ◽  
Restorative Materials ◽  
Restorative Dental Materials

The objectives of this investigation were (1) to develop a sensitive laboratory system that simulates the physiological and clinical conditions of a prepared human tooth in order to facilitate the determination of the bonding and sealing efficacies of restorative dental materials and (2) to conduct experiments with two dentin bonding agents, two posterior composite resin restorative materials (hybrid and micro filled), and a glass-ionomer type II filling material. The system functioned well and provided data to indicate that, after margination, the two posterior composite resin restorative materials performed equally and both performed better than the glass-ionomer filling material; none of the materials provided a perfect seal immediately after insertion, although some restorations demonstrated perfect seals from 16 hours to 28 days after placement; the seal of the glass-ionomer material improved after 28 days of storage in buffer solution; each successive step in the respective composite resin procedures improved the seal except in one case for the micro filled resin.

Comparative evaluation of compressive strength of esthetic restorative materials

2018 ◽  
Vol 14 (1) ◽  
pp. 24
Author(s):  
Dr. Sazan Sherdil Saleem
Keyword(s):  
Compressive Strength ◽  
Testing Machine ◽  
Glass Ionomer Cement ◽  
Glass Ionomer ◽  
Group Iii ◽  
Group I ◽  
Significant Difference ◽  
Resin Modified Glass Ionomer ◽  
Restorative Materials ◽  
Ionomer Cement

The present study was aimed to evaluate and compare the compressive strength ofconventional glass ionomer cement with resin modified glass ionomer, compomer andmicrohybrid composite. A total of 40 specimens of esthetic restorative materials werefabricated using customized cylindrical teflon mould measuring 6mm height and 4mmdiameter and were grouped with ten specimens in each group, Group I: Conventionalglass ionomer cement (Fuji II). Group II: Resin modified glass ionomer (Fuji II LC).Group III: Compomer (Dyract AP) and Group IV: Microhybrid composite resin(Tetric Ceram).They were covered with Mylar strip and were cured using LED lightcuring unit. Compressive strength was evaluated using Universal testing machine. Theresult showed that there were a significant difference among the groups in whichTetric Ceram showed highest compressive strength and Fuji II showed the leastcompressive strength

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