1,720,976 research outputs found
Retrospective Analysis of Lithium Disilicate Laminate Veneers Applied by Experienced Dentists: 10-Year Results
No full textPurpose: To report on the 10-year clinical treatment outcomes for a strictly applied clinical protocol for pressable lithium disilicate glass-ceramic laminate veneers (LDLVs) placed by two experienced dentists. Materials and Methods: A 10-year follow-up assessment of 364 LDLVs placed in 41 patients was undertaken with the clinical criteria color/esthetic match of the porcelain surface, chipping and fracture occurrence, marginal discoloration, and integrity, assessed using the modified United States Public Health Service scoring system. Results: After 10 years, the survival rate was 97.4%. Complications occurred in 1.64% of the restorations (fractures and debonding in 0.55% and 1.09%, respectively). Conclusion: A strict, repeatable protocol for placing veneers with experienced dentists yielded good results
Effectiveness of different cleaning agents on the adherence of Candida albicans to acrylic denture base resin
No full textdoi: 10.1111/j.1741-2358.2010.00379.x ? Effectiveness of different cleaning agents on the adherence of Candida albicans to acrylic denture base resi
Clinical performance of pressable glass-ceramic veneers after 5, 10, 15, and 20 years: A retrospective case series study
No full textObjectives To evaluate the long-term clinical performance and survival rate of pressable lithium-disilicate glass-ceramic veneers (LDSVs). Materials and Methods A total of 413 LDSVs were bonded to anterior and posterior teeth by three experienced clinicians between 1998 and 2012. The LDSVs were examined for color/ esthetic match of the glass-ceramic surface (esthetic evaluation), fracture rate, marginal discoloration (staining of the luting cement), and marginal integrity (including caries, clinical evaluation). For clinical and esthetic evaluations, the modified United States Public Health Services (USPHS) score was used in this study. The success rate was determined with a Kaplan-Meier survival analysis. Results The mean observation time was 11.33 +/- 4.85 years. There was no loss to follow-up, all restorations were accounted for in the final analysis. The probability of survival of the 413 veneers was 98% after 5 years, 95% at 10 years, 91% at 15, and 87% at 20 years, indicating a very low clinical failure rate. Of the 413 restorations, complications were occurred in 15 (3.63%) of all restorations, and fractures and debonding in 6 (1.45%) and 9 (2.18%), respectively. Conclusions The LDSVs showed high survival rate and very good results for color match and anatomic form and marginal integrity in the long-term analysis. Clinical Significance The long-term performance of LDSVs can be considered as highly favorable when carefully planned
Effects of Thermocycling on the Retention of Various Cements of One-Unit and Three-Unit Fixed Implant-Supported Restorations
No full textPurpose: To investigate the physical retention of different cements on one-unit and three-unit implant-supported restorations before and after thermocycling. Materials and Methods: Twenty acrylic resin maxilla models with a single missing tooth and three missing teeth were fabricated and implants were placed. Cast partial denture copings were cemented to Straumann solid abutments with seven different cements. Specimens were placed in a humidifier at 37 degrees C for 24 hours; half of them were then subjected to thermocycling. The tensile force was measured using a universal testing machine with a crosshead speed of 0.5 mm/min. The retention force required to remove the specimens was recorded and the data were submitted to statistical analyses. Results: The retentive strength of the cements was highest for Multilink Implant, followed in descending order by Kavitan Cem, Adhesor Carbofine, Premier Implant, Adhesor, RelyX Temp, and Cavex before and after thermocycling for both one- and three-unit restorations. The bond strength was statistically significantly higher for three-unit than for one-unit restorations before and after thermocycling, and there were statistically significant differences between cements for all groups before and after thermocycling. Both groups showed a statistically significant decrease in bond strength after thermocycling, and the largest differences were seen for Cavex and RelyX Temp for one-unit restorations and Cavex, RelyX Temp, and Kavitan Cem for three-unit restorations. Conclusions: The bond strength value was higher for three-unit than for one-unit restorations, and thermocycling reduced the bond strength of cements, especially Cavex, RelyX Temp, and Kavitan Cem. INT J ORAL MAXILLOFAC IMPLANTS 2012;27:567-576
The effect of different surface preparation methods on the bond strength of composite resin cements to zirconium oxide ceramic restorations
No full textBu çalışmada yttrium ile stabilize edilmiş zirkonyum oksit örneklerde yapılan farklı yüzey hazırlıklarının, iki rezin simanın bağlanma dayanımına etkisinin incelenmesi amaçlanmıştır. Çalışmada kullanılan örnekleri hazırlamak için prefabrik IPS e.max ZirCAD bloklar İsomet kesme cihazında 2 mm kalınlığında kesilmişlerdir. Seksen adet kesilen örnek sinterize edildikten sonra farklı yüzey işlemleri yapılmak üzere rasgele 4 gruba ayrılmışlardır. Birinci grup örnekler hiçbir yüzey işlemine tabi tutulnadan kontrol grubu olarak bırakılmışlardır. İkinci gruptaki örnekler 110? Al2O3 ile kumlanmışlardır. Üçüncü grubu oluşturan örnekler ise orta grenli elmas frezle pürüzlendirilmişlerdir. Son gruptaki örneklerde Er:YAG lazer cihazı kullanılarak pürüzlendirilmişlerdir. Yüzey işlemleri tamamlanan örnekler çalışmada kullanılan iki farklı rezin simanla (Multilink Automix ve Multilink Sprint) yapıştırılmak üzere 10'arlı gruplara ayrılmışlardır. Yapıştırma işlemini takiben örnekler 24 saat distile su içerisinde bekletilmiş ve daha sonra kesme testine tabi tutulmuşlardır. Kopmanın gerçekleştiği kuvvet değerleri Newton cinsinden kaydedilmiştir. Elde edilen değerler yüzey alanına bölünerek MPa'a çevrilmiş ve daha sonra değerler iki yönlü varyans analizi (2-way ANOVA), Kruskal-Wallis testi ve Bonferroni düzeltmeli Mann-Whitney U istatistiksel testleri kullanılarak değerlendirilmişlerdir. Farklı yüzey işlemleri uygulanan her gruptan örneklerin bağlanma yüzeyleri SEM'de incelenmiştir. Varyans analizi sonucunda simanlar ve yüzey işlemleri arasında önemli fark bulunurken (p<0.05), yüzey işlemleri ile simanların etkileşimleri arasındaki fark önemli bulunmamıştır (p >0.05). Multilink Automix zirkonyum oksit seramik yüzeylere Multilink Sprint'e göre daha yüksek bağlanma dayanımı göstermiştir. Yüzey işlemlerinden kumlama yapılan zirkonyum yüzeylere her iki simanın da bağlanma dayanımı en yüksek bulunmuştur. Bunu elmas frezle pürüzlendirme yapılan grup izlemiştir. En düşük bağlanma dayanımlarını ise lazerle pürüzlendirilen grup ile kontrol grubu göstermiştir. Bağlanma yüzeylerinin SEM analizinde kumlama yapılan yüzeylerde kontrol grubundan tamamen farklı oldukça girintili çıkıntılı bir yüzey gözlenirken, elmas frezle pürüzlendirilen yüzeylerde, yine kontrol grubundan farklı, frezin yönüne bağlı simetrik izler görülmüştür. Lazerle pürüzlendirilen yüzeylerin SEM görüntülerinde ise yüzeyin fazla değişmediği ve kontrol grubunda izlenen düz yapının korunduğu tespit edilmiştir.The purpose of this in vitro study was to evaluate the influence of different surface preparation methods on the bond strength of two composite resins to yttrium stabilized zirconium oxide ceramic restorations. Rectangle shape test samples were cut out of IPS e.max ZirCAD blocks in 2 mm thickness, using Isomet slow speed diamond saw. Following the sintering procedure, eighty test specimens were divided randomly into 4 groups of 20 each. Specimens in the first group were left as received to serve as a control group. In the second group, specimens treated by use of airborne particle abrasion with 110 ? Al2O3 . Roughening the surfaces with diamond burs were applied on the specimens of the third group. Er:YAG laser irradiation was the choice of surface treatment for the last group. For the second phase of this experiment, specimens were divided into subgroups of 10 for each surface treatment protocol followed by the application of two resin cements (Multilink Automix and Multilink Sprint). Once the resin cement completed its initial setting, test samples were stored in distilled water for 24 hours before the shear test. Values of load at the time of fracture were recorded as Newton and converted to MPa by dividing the imposed force (in N) to bond area (in mm2 ). Statistical analyses of the results were evaluated by means of 2-way ANOVA, Kruskal-Wallis analysis and Mann-Whitney U tests with Bonferroni correction. Selected specimens for each surface treatment protocol were examined in a scanning electron microscope (SEM) for determination of surface morphology. Two-way ANOVA showed statistically significant difference amongst the resin cements and surface treatment methods (p<0.05). However, there was no significant difference between surface treatment and the resin cement interaction (p > 0.05). Bond strength of Multilink Automix on zirconium oxide ceramic surfaces found to be higher than Multilink Sprint. Bond strengths of both resin cements were the highest on sandblasted surfaces of zirconium oxide samples. This was followed by diamond abrasion group. Lowest bond strength values were encountered in laser irradiation and control groups. The SEM examination of the various surface preparation methods revealed that sandblasting caused a rough surface texture in comparison to control group. The ground surfaces with a medium grit diamond bur showed regular surface grazes on the direction of diamond bur used. SEM analysis of laser irradiated surfaces illustrated rather plain surface morphology, very similar to the control group
Oral health status and treatment requirements of different residential homes in Istanbul: A comparative study
No full textThe purpose of this study was to investigate dental/denture status of the elderly people living in different residential homes. In 346 elderly people from different residential homes two belonging to the state (Group 1 and Group 2) and one supported by private foundations (Group 3) were examined. Sixty percent of participants were edentulous and 22.8% of participants had no complete dentures which 9 (7.4%) of them were in Groups 1 and 2. Over 50% of the participants had no or low income and 45% of participants were illiterate. All of the participants who were illiterate and had low income were in Group 1 and Group 2. Oral hygiene was good for 15.4% and only 19.4% of participants removed their dentures overnight. Denture stomatitis was observed in 61.7% of subjects. Significant correlation was found between denture hygiene and age of participant, general health status, denture stomatitis, and overnight denture wear (p = 0.001). The decayed, missing and filled teeth (DMFT) scores were 25.52 +/- 3.37. There was statistically significant differences between groups for DMFT scores (p = 0.016). Dental health education is also needed focusing on the special needs of this neglected and socioeconomically deprived population to improve their quality of life. (C) 2010 Elsevier Ireland Ltd. All rights reserved
Clinical and microbiological efficacy of three different treatment methods in the management of denture stomatitis
No full textObjective: This study evaluated. the effect of mouthrinses and tissue conditioner on the clinical findings and microbial flora of 60 patients with Newton's type II denture stomatitis (N2DS) Background: Denture stomatitis is a common problem in complete denture wearers. Materials and methods: Sixty patients with N2DS were included in this study and divided into three groups. Two groups of patients were instructed to rinse their mouth with the designated mouthrinses DioxiDent and Corsodyl twice daily for 1 min and to soak their dentures overnight in these solutions for 15 days. For the third group, tissue conditioner was placed in each of 20 patients' existing maxillary dentures. Patients were evaluated both clinically and microbiologically at baseline and after 15 days. Palatal swabs and smears were taken from each patient before and after treatment and these samples were examined mycologically. The difference between Candida colonisation before and after treatment and the differences between pre-treatment and post-treatment clinical findings were assessed. Results: DioxiDent and Corsodyl showed an improvement in palatal inflammation and a decrease in Candida colonisation compared to Visco-gel. Conclusions: The effectiveness of topical chlorine dioxide and chlorhexidine gluconate in the management of N2DS was demonstrated
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