Effect of resealing on microleakage of resin composite restorations in relationship to margin design and composite type

ABSTRACTObjective: To determine the relationship between margin preparation design and resin-composite type on microleakage with or without re-application of surface-penetrating sealant.Methods: Class-I resin-composite restorations were completed for 128 extracted human molars. Half of the margins were beveled, the other half, butt-joint. Half of each group was restored with Filtek-Supreme (FS), the other half with Esthet-X (EX) using their respective adhesive systems. Margins were etched and sealed with a surface-penetrating sealant, Fortify. The samples were stored in water 24h, and thermocycled (5,000 cycles, 5°C-55°C). Then, samples were abraded using a toothbrush machine (6,000 strokes). Half of the restorations from each sealant group (n=16) were resealed, and the other half had no further treatment. Thermocycling and tooth brushing were repeated. The samples were sealed with nail polish, immersed in methylene-blue for 8h, sectioned, and magnified digital photographs were taken. Three examiners assessed dye penetration. A 2x2x2 multi-layered Chi-Square analysis, using Cochran-Mantel-Haenszel test was conducted for statistical analysis.Results: No difference was observed between sealed and resealed FS and EX restorations with butt-joint margins. In beveled margins, resealing caused significantly less microleakage (P<.01). No differences were found between restorations either sealed or resealed with bevel margins. In butt-joint margins, at the leakage level deeper than 2/3 of the preparation depth, resealed FS showed less microleakage than EX resealed restorations (P<.01).Conclusion: Resealing reduced microleakage in bevel margins, however, in butt-joint margins resealing did not affect the leakage. A significant statistical relationship exists between and within resealing, margin preparation design, type of composite, and microleakage. (Eur J Dent 2012;6:389-395)

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Marginal Integrity of Bulk Versus Incremental Fill Class II Composite Restorations

Operative Dentistry ◽

10.2341/14-306-l ◽

2016 ◽

Vol 41 (2) ◽

pp. 146-156 ◽

Cited By ~ 26

Author(s):

F Al-Harbi ◽

D Kaisarly ◽

D Bader ◽

M El Gezawi

Keyword(s):

Resin Composite ◽

Class Ii ◽

Chi Square ◽

Sandwich Technique ◽

Thermomechanical Cycling ◽

Composite Restorations ◽

Marginal Integrity ◽

Chi Square Test ◽

Maxillary Premolars ◽

Self Etch

SUMMARY Bulk-fill composites have been introduced to facilitate the placement of deep direct resin composite restorations. This study aimed at analyzing the cervical marginal integrity of bulk-fill vs incremental and open-sandwich class II resin composite restorations after thermomechanical cycling using replica scanning electron microscopy (SEM) and ranking according to the World Dental Federation (FDI) criteria. Box-only class II cavities were prepared in 91 maxillary premolars with the gingival margin placed 1 mm above and below the cemento-enamel junction. Eighty-four premolars were divided into self-etch and total-etch groups, then subdivided into six restorative subgroups (n=7): 1-Tetric Ceram HB (TC) was used incrementally and in the open-sandwich technique with 2-Tetric EvoFlow (EF) and 3-Smart Dentin Replacement (SD). Bulk-fill restoratives were 4-SonicFill (SF), 5-Tetric N-Ceram Bulk Fill (TN), and 6-Tetric EvoCeram Bulk Fill (TE). In subgroups 1-5, Tetric N-Bond self-etch and Tetric N-Bond total-etch adhesives were used, whereas in subgroup 6, AdheSE self-etch and ExciTE F total etch were used. One more group (n=7) was restored with Filtek P90 Low Shrink Posterior Restorative (P9) only in combination with its self-etch P90 System Adhesive. Materials were manipulated and light cured (20 seconds, 1600 mW/cm2), and restorations were artificially aged by thermo-occlusal load cycling. Polyvinyl-siloxane impressions were taken and poured with epoxy resin. Resin replicas were examined by SEM (200×) for marginal sealing, and percentages of perfect margins were analyzed. Moreover, samples were examined using loupes (3.5×) and explorers and categorized according to the FDI criteria. Results were statistically analyzed (SEM by Kruskal-Wallis test and FDI by chi-square test) without significant differences in either the replica SEM groups (p=0.848) or the FDI criteria groups (p>0.05). The best SEM results at the enamel margin were in TC+EF/total-etch and SF/total-etch and at the cementum margins were in SF/total-etch and TE/self-etch, while the worst were in TC/self-etch at both margins. According to FDI criteria, the best was TE/total-etch at the enamel margin, and the poorest was P9/self-etch at the cementum margin. Groups did not differ significantly, and there was a strong correlation in results between replica SEM and FDI ranking.

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Variation in Dental Crown Morphology in Malaysian Populations

Dental Anthropology Journal ◽

10.26575/daj.v19i2.120 ◽

2018 ◽

Vol 19 (2) ◽

pp. 49-60 ◽

Cited By ~ 6

Author(s):

Mohd Fadhli Khamis ◽

Jane A. Taylor ◽

Abdul Rani Samsudin ◽

Grant C. Townsend

Keyword(s):

The Other ◽

Chi Square ◽

Distance Analysis ◽

Crown Morphology ◽

The Mean ◽

Chi Square Analysis ◽

Dental Traits ◽

Main Population ◽

Crown Traits ◽

Dental Crown

Dental crown variation was studied inthe four main population groups living in Malaysiausing dental casts (upper and lower) obtained from 790individuals. The aims of the study were to characterizevariation in 13 dental crown traits, within groups as wellas between groups, and to assess affinities between thegroups based on frequencies of occurrence of dentalfeatures. Using chi-square analysis and Fisher’s exacttest, the majority of dental traits were found to bebilaterally symmetrical and to demonstrate low sexualdimorphism. Comparisons of trait frequencies betweengroups revealed similarities between Malays, Jahai(Negritos) and Chinese who conformed to MongoloidSinodont-Sundadont dental patterns, whereas theIndians conformed to an Indo-European pattern.Phenetic distance analysis, using the mean measureof divergence, showed that Indians were markedlyseparated from the other three groups, while Malayswere closer to Jahai than to Chinese. These findingsbased on dental traits are consistent with historicalexplanations of affinities between modern Malaysianpopulations.

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Epidemiology of Hypertriglyceridemia in the Elderly Taiwanese population

McGill Journal of Medicine ◽

10.26443/mjm.v6i1.523 ◽

2020 ◽

Vol 6 (1) ◽

Author(s):

Cheng-Chieh Lin ◽

Tsai-Chung Li ◽

Shih-Wei Lai ◽

Chia-Ing Li ◽

Kuo-Che Wang ◽

...

Keyword(s):

Logistic Regression ◽

Cardiovascular Risk ◽

Systolic Pressure ◽

The Elderly ◽

The Other ◽

Glutamic Pyruvic Transaminase ◽

Multivariate Logistic Regression ◽

Chi Square ◽

The Mean ◽

Chi Square Analysis

Our study used data collected in Chung-Hsing Village in Taiwan in May 1998 to evaluate the distribution of triglycerides and the association between hypertriglyceridemia and its correlates in elderly people. All individuals aged 65 and over were recruited as study subjects. A total of 1093 persons, out of 1774 registered residents, were contacted in face-to-face interviews. The response rate was 61.6%. However, only 586 respondents had blood tests and completed questionnaires. Analysis in this study was based on these 586 subjects. To study the significant correlates of hypertriglyceridemia, t-tests, ANOVAs, chi-square analysis and multivariate logistic regression were used. Among the study population, 66.0% were men and 34.0% were women. The mean age was 73.1 ± 5.3 years. The mean triglyceride values were 1.65 ± 0.93 mmol/L in men and 2.02 ± 1.44 mmol/L in women (p < 0.01). The proportions of hypertriglyceridemia were 18.7% in men and 27.6% in women (p < 0.05). After controlling the other covariates, analysis by multivariate logistic regression showed that the factors significantly related to hypertriglyceridemia were high systolic pressure, abnormal glutamic pyruvic transaminase, hypercholesterolemia and hyperglycemia. Thus, these results support the hypothesis that it is important to examine the other cardiovascular risk factors if one cardiovascular risk factor is observed. The data also suggest one should determine the triglyceride level when abnormal glutamic pyruvic transaminase is identified in an elderly subject.

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Use of Chi-Square in Simple Crossover Designs

Journal of Mental Science ◽

10.1192/bjp.108.455.406 ◽

1962 ◽

Vol 108 (455) ◽

pp. 406-410 ◽

Cited By ~ 2

Author(s):

Seymour Fisher

Keyword(s):

Clinical Research ◽

Clinical Evaluation ◽

Active Drug ◽

Crossover Design ◽

The Other ◽

New Drugs ◽

Criterion Measure ◽

Crossover Designs ◽

Chi Square ◽

Chi Square Analysis

In the clinical evaluation of new drugs, many investigators employ a simple crossover design, where half of the patients first receive the active drug for a given period of time, followed by a switch to an inert placebo for a similar period of time; the other half of the patients begin the trial on placebo, and are subsequently switched to the active drug. When the criterion measure consists of an over-all rating of, say, “Improved” or “Non-Improved”, the data lend themselves to a chi-square analysis. It is clear, however, that in many clinical circles, this analytic technique is being consistently misused, despite the fact that the various pitfalls and underlying assumptions have been widely emphasized (Lewis and Burke, 3). The purpose of this brief note is to demonstrate the proper use of chi-square, and also to show that, when incorrectly used, the clinical research investigator may increase the probability of prematurely discarding an effective drug.

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Hubungan Pemberian ASI Eksklusif dengan Angka Kejadian Diare Akut pada Bayi Usia 0-1 Tahun di Puskesmas Kuranji Kota Padang

Jurnal Kesehatan Andalas ◽

10.25077/jka.v2i2.120 ◽

2013 ◽

Vol 2 (2) ◽

pp. 62

Author(s):

Eka Putri Rahmadhani ◽

Gustina Lubis ◽

Edison Edison

Keyword(s):

Public Health ◽

Health Center ◽

Exclusive Breastfeeding ◽

Random Sampling ◽

Simple Random Sampling ◽

The Other ◽

Chi Square ◽

Cross Sectional ◽

Public Health Center ◽

Chi Square Analysis

AbstrakPemberian ASI eksklusif merupakan salah satu upaya untuk mencapai tumbuh kembang optimal dan terlindungi dari penyakit seperti diare. Tujuan penelitian ini adalah untuk mengetahui hubungan pemberian ASI eksklusif dengan angka kejadian diare akut pada bayi usia 0-1 tahun di Puskesmas Kuranji Kota Padang. Penelitian ini dilaksanakan secara observasional dengan pendekatan cross sectional. Sampel penelitian ini adalah bayi usia 0-1 tahun yang berkunjung ke posyandu di wilayah kerja Puskesmas Kuranji Kota Padang dengan menggunakan simple random sampling. Jumlah bayi dengan kelompok usia 0-5 bulan 29 hari sebanyak 69 orang (51,1%) dan usia 6-12 bulan sebanyak 66 orang (48,9%). Dari hasil penelitian didapatkan bayi usia 0-5 bulan 29 hari yang masih mendapat ASI saja sebanyak 41 bayi (30,4%) dan yang sudah mendapat campuran lain selain ASI sebanyak 28 bayi (20,7%). Jumlah bayi usia 6-12 bulan dengan ASI eksklusif sebanyak 34 bayi (25,2%) dan 32 bayi lainnya (23,7%) non ASI eksklusif. Sebanyak 57 bayi (42,2%) pernah diare dan 78 bayi lainnya (57,8%) tidak pernah. Analisis chi square mendapatkan p=0,001 dan hasil ini signifikan (p<0,5). Pemberian ASI eksklusif selama 6 bulan harus ditingkatkan karena mempunyai hubungan dengan angka kejadian diare akut.Kata kunci: Bayi, ASI Exclusif, diareAbstractExclusive breastfeeding is an effort to achieve optimal growth and development and can be protected from diarrhea. The purpose of this study was to determine the relationship of exclusive breastfeeding with the incidence of acute diarrhea in infants aged 0-1 years in the Kuranji Public Health Center Padang. This study conducted a cross sectional observational study. The sample was a baby aged 0-1 years who visited posyandu in the Kuranji Public Health Center working area using simple random sampling. The result showed 41 infants (30.4%) aged 0-5 months 29 days which is still breastfed only and other than breast milk were 28 infants (20.7%). Number of 6-12 months infants are exclusively breastfed as many as 34 babies (25.2%) while the other 32 babies (23.7%) were not exclusively breastfed. A total of 57 infants (42.2%) had suffered from diarrhea and the other 78 infants (57.8%) had never. Chi square analysis got p = 0.001 and the results are significant (p <0.5). Exclusive breastfeeding for 6 months should be improved because it has relation with diarrhea.Keywords:Baby, Exclusive breastfeeding, diarrhea

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Effect of Different Adhesion Strategies on Bond Strength of Resin Composite to Composite-dentin Complex

Operative Dentistry ◽

10.2341/11-482-l ◽

2013 ◽

Vol 38 (1) ◽

pp. 63-72 ◽

Cited By ~ 19

Author(s):

M Özcan ◽

G Pekkan

Keyword(s):

Bond Strength ◽

Resin Composite ◽

Silica Coating ◽

Bonding Agent ◽

Acid Etching ◽

Dentin Bonding ◽

Composite Restorations ◽

Composite Type ◽

Coating Composite ◽

Dentin Bonding Agent

ABSTRACT Service life of discolored and abraded resin composite restorations could be prolonged by repair or relayering actions. Composite-composite adhesion can be achieved successfully using some surface conditioning methods, but the most effective adhesion protocol for relayering is not known when the composite restorations are surrounded with dentin. This study evaluated the effect of three adhesion strategies on the bond strength of resin composite to the composite-dentin complex. Intact maxillary central incisors (N=72, n=8 per subgroup) were collected and the coronal parts of the teeth were embedded in autopolymerized poly(methyl tfr54methacrylate) surrounded by a polyvinyl chloride cylinder. Cylindrical cavities (diameter: 2.6 mm; depth: 2 mm) were opened in the middle of the labial surfaces of the teeth using a standard diamond bur, and the specimens were randomly divided into three groups. Two types of resin composite, namely microhybrid (Quadrant Anterior Shine; AS) and nanohybrid (Grandio; G), were photo-polymerized incrementally in the cavities according to each manufacturer's recommendations. The composite-enamel surfaces were ground finished to 1200-grit silicone carbide paper until the dentin was exposed. The surfaces of the substrate composites and the surrounding dentin were conditioned according to one of the following adhesion protocols: protocol 1: acid-etching (dentin) + silica coating (composite) + silanization (composite) + primer (dentin) + bonding agent (dentin + composite); protocol 2: silica coating (composite) + acid-etching (dentin) + silanization (composite) + primer (dentin) + bonding agent (dentin + composite); and protocol 3: acid-etching (dentin) + primer (dentin) + silanization (composite) + bonding agent (dentin + composite). Applied primer and bonding agents were the corresponding materials of the composite manufacturer. Silica coating (CoJet sand, 30 μm) was achieved using a chairside air-abrasion device (distance: 10 mm; duration: four seconds in circular motion). After conditioning protocols, the repair resin was adhered to the substrate surfaces using transparent polyethylene molds (diameter: 3.6 mm) incrementally and photo-polymerized. The substrate-adherend combinations were as follows: AS-AS, G-G, AS-G. Shear force was applied to the adhesive interface in a Universal Testing Machine (crosshead speed: 1 mm/min). The types of failures were further evaluated and categorized as follows: 1) cohesive in the composite substrate and 2) adhesive at the interface. Bond strength values (MPa) were statistically analyzed using two-way analysis of variance and least significant difference post hoc tests (α=0.05). Significant effects of the adhesion strategy (p=0.006) and the composite type (p=0.000) were found. Interaction terms were not significant (p=0.292). Regardless of the substrate-adherend combination, protocol 1 (17–22 MPa) showed significantly higher results than did protocols 2 (15–17 MPa) and 3 (11–17 MPa) (p=0.028, p=0.002, respectively). The highest results were obtained from the G-G combination after all three protocols (17–22 MPa). The incidence of cohesive failures was more common when the substrate and the adherend were the same composite type (AS-AS: 87.5%, 87.5%, 75%; G-G: 100%, 75%, 50% for protocols 1, 2, and 3, respectively). When substrate and adherend were used interchangeably, adhesive failures were more frequent (25%, 50%, and 100% for protocol 1, 2, and 3, respectively). When the substrate and the adherend are of the same type, greater repair strength could be expected. In the repair of composites next to the dentin, depending on the composite type, conditioning the composite with silica coating and silanization after etching the dentin adds to the repair strength compared to the results obtained with silane application only.

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In vivo Evaluation of Proximal Resin Composite Restorations performed using Three Different Matrix Systems

The Journal of Contemporary Dental Practice ◽

10.5005/jp-journals-10024-1735 ◽

2015 ◽

Vol 16 (8) ◽

pp. 643-647 ◽

Cited By ~ 2

Author(s):

Mateus Rodrigues Tonetto ◽

Alvaro Henrique Borges ◽

Leily Macedo Firoozmand ◽

Etevaldo Matos Maia Filho ◽

Matheus Coelho Bandeca ◽

...

Keyword(s):

Metal Matrix ◽

Resin Composite ◽

Elastic Wedge ◽

Chi Square ◽

In Vivo Evaluation ◽

Composite Restorations ◽

The Matrix ◽

Group 2 ◽

Composite Resin Restorations

ABSTRACT Objective The aim of this in vivo study was to radiographically evaluate the proximal contour of composite resin restorations performed using different matrix systems. Materials and methods Patients with premolars needing class II type resin composite restorations involving the marginal ridge were selected. Thirty premolars were selected and randomly divided into three groups (n = 10 each) to receive restorations using different matrix systems: group 1: metal matrix coupled to a carrier matrix and wood wedge (G1-MMW); group 2: sectioned and precontoured metal matrix and elastic wedge (G2-SME); and group 3: a polyester strip and reflective wedge (G3-PMR). After the restorative procedure, bitewing radiographs were performed and analyzed by three calibrated professionals. The quality of the proximal contact and marginal adaptation of the proximal surfaces was classified as either correct or incorrect (undercontour/overcontour). Results The Pearson Chi-square statistical test (α = 5%) revealed a statistically difference between frequencies of correct and incorrect restorations (α2 = 6.787, p < 0.05). The group G2 SME produced a higher frequency of correct proximal contours (90%), while G1-MMW and G3-PMR had a ratio of 40% correct and 60% incorrect contours respectively. Conclusion None of the matrix systems was able to prevent the formation of incorrect proximal contours; however, the sectioned and precontoured metal matrix/elastic wedge configuration provided better results as compared to the other groups. How to cite this article Gomes IA, Filho EMM, Mariz DCBR, Borges AH, Tonetto MR, Firoozmand LM, Kuga CM, De Jesus RRT, Bandéca MC. In vivo Evaluation of Proximal Resin Composite Restorations performed using Three Different Matrix Systems. J Contemp Dent Pract 2015;16(8):643-647.

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Amalgam and Composite Use among Dentists and Dental Interns in Saudi Arabia

INTERNATIONAL JOURNAL OF EMERGING TRENDS IN SCIENCE AND TECHNOLOGY ◽

10.18535//ijetst/v7i2.01 ◽

2020 ◽

pp. 6879-6887

Author(s):

Rahaf Al-Safadi ◽

Fatimah Radwan ◽

Leenah Al-Momin ◽

Raghad Bakhsh ◽

Sarah Slais ◽

...

Keyword(s):

Saudi Arabia ◽

Resin Composite ◽

Young Patients ◽

Chi Square ◽

Cavity Depth ◽

Composite Restorations ◽

Mandibular Molar ◽

Chi Square Test ◽

Tooth Type ◽

Amalgam Restorations

Aim: The aim of this study was to detect the use of amalgam versus resin composite restorations placed in permanent posterior vital teeth among dentists practicing in Saudi Arabia and dental interns training in Saudi Arabia. Materials and Methods: 318 patients aged ≥ 8 years were randomly selected and clinically examined for amalgam and resin composite restorations placed in permanent posterior vital teeth by dentists and by dental interns in Saudi Arabia. The restorations were placed in teeth preparations Class I and Class II. Also, bitewing and or periapical radiographs were used to define the depth of the cavity. The data obtained were documented in a patient examination form then statistically analyzed using Chi-Square Test or Fisher-Freeman-Halton Test and Spearman’s Correlation Coefficient. Results: Composite was the predominant kind of restoration placed by dental interns, and dentists placed more composite restorations than amalgam ones. There was an insignificant relationship between the kind of restoration placed by dental interns (amalgam, composite) and the tooth type (maxillary / mandibular premolar, maxillary / mandibular molar), the class of tooth preparation, the cavity depth, the age of the patient, and the gender of the patient p> 0.05. However, there was a significant relationship between the kind of restoration placed by dentists (amalgam, composite) and the cavity depth p < 0.05. Also, dentists placed more composite restorations in maxillary first premolars and in young patients 8-29 years, while they placed more amalgam restorations in mandibular second molars and in older patients 41-50 years p < 0.05. There was an insignificant relationship between the kind of restoration placed by dentists (amalgam, composite) and the class of cavity preparation and the gender of the patient p > 0.05. Conclusion: Both dentists and dental interns used composite restorative material more than amalgam, but dentists placed more amalgam restorations than dental interns. Dental interns mainly used composite. Keywords: Amalgam, Composite, Class, Dentist, Depth, Intern, Type.

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Gingival Microleakage of Class V Composite Restorations with Fiber Inserts

The Journal of Contemporary Dental Practice ◽

10.5005/jp-journals-10024-1375 ◽

2013 ◽

Vol 14 (4) ◽

pp. 622-628

Author(s):

Walaa Ahmed ◽

Wafa El-Badrawy ◽

Gajanan Kulkarni ◽

Anuradha Prakki ◽

Omar El-Mowafy

Keyword(s):

Resin Composite ◽

Acrylic Resin ◽

Class V ◽

Bonding Agents ◽

Composite Restorations ◽

Nail Polish ◽

Self Etch ◽

Wallis Anova ◽

Scale Data ◽

Fiber Inserts

ABSTRACT Aim This study investigated the effect of different fiber inserts (glass and polyethylene), bonding agents, and resin composites on the gingival margin microleakage of class V composite restorations. Materials and methods Sixty premolars were sterilized and mounted in acrylic resin bases. Class V cavities were prepared buccally and lingually, 1 mm below the cementoenamel junction, comprising 12 groups (n = 10). In the experimental groups fiber inserts were cut and placed at the gingival seat, while the control groups had no inserts. Combinations of two composite materials, Filtek-Z250 and Filtek-LS (3M-ESPE), and four bonding agents, Clearfil SE bond (Kuraray) (C), Scotch Bond Multipurpose (3M-ESPE) (SB), Prime and Bond NT (Dentsply) (PB), and Filtek-LS (3M-ESPE) (LS) were used. Restorations were incrementally inserted and polymerized for 40s. Specimens were then stored in distilled water for 7 days and thermocycled for 500 cycles. Teeth surfaces were sealed with nail polish except for 1 mm around restoration margins and immersed in 2% red procion dye. Teeth were then sectioned buccolingually and dye penetration was assessed with five-point scale. Data were statistically-analyzed by Kruskal-Wallis, ANOVA and Tukey's tests (α = 5%). Results Mean microleakage scores varied from 0.40 (Groups C, C with polyethylene, LS, LS with polyethylene) to 1.50 (SB). Conclusion Different bonding agents led to differences in microleakage scores where C and LS showed significantly lower microleakage than PB. SB had highest mean microleakage score, however, incorporation of fibers resulted in significant reduction in microleakage. Clinical significance Class V resin composite restorations bonded with a total-etch adhesive had a significant reduction in mean microleakage scores when glass or polyethylene fibers were placed at the gingival cavo-surface margin. In contrast, for two self-etch adhesive systems, the incorporation of fibers had no significant effect on mean microleakage scores. How to cite this article Ahmed W, El-Badrawy W, Kulkarni G, Prakki A, El-Mowafy O. Gingival Microleakage of Class V Composite Restorations with Fiber Inserts. J Contemp Dent Pract 2013;14(4):622-628.

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