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At least 217 records · Page 12Linked to original sources
PubMed2003

Three-year clinical performance of a compomer in stress-bearing restorations in permanent posterior teeth.

PURPOSE: To evaluate the 3-year clinical performance of the compomer Hytac in Class I and II cavities of permanent posterior teeth. METHODS: 53 restorations were placed in 14 patients. The compomer Hytac was used with the self-etching adhesive Hytac OSB (total bonding) without additional enamel-etching with phosphoric acid according to manufacturer's instructions. Restorations were rated at baseline and 3 years according to modified USPHS criteria in relation to tooth type (molar, premolar), size and class of cavities, isolation type (rubber dam, cotton rolls) and use of a calcium hydroxide liner. After 3 years, 39 restorations (73.6%) were available for examination. Statistical analysis was performed using Mann-Whitney U test and Fisher's exact test. RESULTS: After 3 years, three restorations failed (7.7%). The success rate was therefore 92.3% with an average annual failure rate of 2.6%. There was no statistically significant difference (P < 0.05) found concerning neither of the USPHS criteria nor the failures between any of the restoration groups.

Bicuspid↗
PubMed2003

Effect of light-curing method and irradiation time on marginal sealing and cavity wall adaptation of resin composite restorations.

PURPOSE: To evaluate the effect of irradiation time on two light-curing methods on the marginal sealing and cavity wall adaptation of resin-based composite restorations. METHODS: Cylindrical cavities, 1 mm deep and 3 mm in diameter (C-factor = 2.3) were prepared on flat superficial bovine dentin surfaces. The teeth were restored with Clearfil Photo Bond, Clearfil Liner Bond 2 or Super-Bond D-Liner adhesive systems followed by Photo Clearfil Bright resin-based composite. The resins were cured using a conventional method at an output of 600 mW/cm2 for 60 s, or 600 mW/cm2 for 30 s, or the slow-start curing method at an output of 270 mW/cm2 for 10 s + 5 s (interval) + 600 mW/cm2 for 50 s or 270 mW/cm2 for 10 s + 5 s (interval) + 600 mW/cm2 for 20 s. After thermocycling, a dye penetration test was carried out. The dye penetration length was calculated as a percentage of the total cavity wall length. RESULTS: Slow-start curing method; 270 mW/cm2 10 s + 5 s (interval) + 600 mW/cm2 for 50 s showed the best marginal sealing and cavity wall adaptation. A shorter irradiation time increased cavity wall adaptation when the conventional curing method was used. Super-Bond D-Liner showed good marginal sealing and resin composite adaptation to the cavity wall regardless of the light-curing method.

Animals↗
PubMed2003

Effect of different polymerization methods on composite microleakage.

PURPOSE: To evaluate the microleakage of a condensable resin composite using a microhybrid flowable composite as a liner, cured with four different methods of polymerization. METHODS: 40 freshly extracted caries-free human premolars and molars were used. MO/DO Class II standardized preparations were performed with the gingival margin placed 1 mm above the CEJ. Teeth were randomly divided into four groups. Group 1 (control group): conventional mode (Elipar Highlight), Group 2: step mode (Elipar Highlight), Group 3: ramp mode (Elipar Trilight) and Group 4: pulse mode (VIP). Preparations were etched with 32% phosphoric acid (Uni-Etch) and an adhesive system (One-Step) was used according to the manufacturer's instructions. Teeth were then restored using a 1 mm layer of flowable composite (A2 AEliteflo LV) on the gingival and pulpal floor and condensable composite (Pyramid A2 Dentin and A1 Enamel) in 2 mm increments. Teeth were thermocycled x500 between 5 degrees C and 55 degrees C with a dwell of 30 seconds and then placed in a 0.5% methylene blue dye solution for 24 hours at 37 degrees C. Samples were sectioned longitudinally and evaluated for microleakage at the gingival margin under a stereomicroscope at x30 magnification. Dye penetration was scored using an ordinal scoring system as 0: no penetration; 1: enamel penetration; 2: dentin penetration. RESULTS: A Mann-Whitney U Test revealed a statistically significant difference between Group 1 with Groups 2, 3 and 4 (P < 0.001). Group 1 yielded the most microleakage. No statistically significant difference was noted between Groups 2, 3 and 4.

Acid Etching, Dental↗
PubMed2003

Microleakage of resin-based liner materials and condensable composites using filled and unfilled adhesives.

PURPOSE: To evaluate the efficacy of differing resin based liner materials in reducing microleakage. METHODS: 80 freshly extracted caries-free human premolars and molars were used. MO/DO Class II standardized preparations were performed with the gingival margin placed 1 mm above the CEJ. Teeth were randomly divided into two groups; each one was divided into four subgroups (A-B-C-D for Group 1 and E-F-G-H for Group 2). Each prepared tooth was etched with 32% H3PO4 (Uni Etch); in Group 1, one coat of One Step and in Group 2, two coats and two cures of Prime & Bond NT adhesives were applied. In each group 1 mm layer of three different liners was used: A2 Heliomolar RO for A and E; A2 Heliomolar Flow for B and F; A2 Bisfil 2B for C and G. No liner was used for D and H subgroups. Teeth were then restored using 2 mm increments of Pyramid A2 Dentin and A1 Enamel and cured with a VIP curing light. Teeth were thermocycled x500 between 5 degrees C and 55 degrees C with a dwell of 30 seconds and then placed in a 0.5% methylene blue dye solution for 24 hours at 37 degrees C. Samples were sectioned longitudinally and evaluated for microleakage at the gingival margin under a stereomicroscope at x20 magnification. Dye penetration was scored using an Ordinal Scoring System where 0= no penetration; 1= enamel penetration; and 2= dentin penetration. RESULTS: A Chi Square Test revealed a statistically significant difference between Group 1 and Groups 2 (P < 0.001). Group 1 yielded the most microleakage. No statistically significant difference was noted between the subgroups of each group; a statistically significant difference of B and D vs. E and H (P < 0.01 > 0.001) and B vs. G and D (P < 0.05 > 0.01) was also noted. The dentin bonding agent in Group 2 contributed to a reduction of microleakage when compared to Group 1.

Acid Etching, Dental↗
PubMed2004

Direct posterior resin composite restorations: considerations on finishing/polishing. Clinical procedures.

In spite of advances in materials and techniques for direct posterior composite restorations, some problems remain, such as occlusal wear rate, marginal breakdown, and marked operator technique sensitivity. To enhance longevity of these restorations, finishing and polishing procedures are commonly indicated. Although these procedures offer advantages, they also have some drawbacks, such as higher marginal breakdown and increased susceptibility to wear following finishing procedures. Faced with the disadvantages brought by finishing and polishing procedures, it seems reasonable to try and find a technique to omit them. This paper presents clinical cases exhibiting a restorative technique that prevents, or at least reduces, the need for instrumentation of the restoration. In cases when finishing procedures are necessary, the restorations should be sealed with a specific resinous agent to impart new strength to the instrumented surface and improve marginal integrity. In addition, the suggested technique promotes a better occlusal anatomy than that attained with the traditional technique.

Acid Etching, Dental↗
PubMedDate not supplied

Multi-colored dual-cured compomer.

A new polyacid-modified resin-based composite (compomer) restorative material has been introduced. Unlike other compomers, this material undergoes both chemical polymerization and photocuring hardening reactions. The new compomer is called MagicFil, and its chief attraction to children is that it is manufactured in 4 different colors, all with glitter inclusions.

Acid Etching, Dental↗
PubMed1992

Pulp response to bases and cavity depths.

In cavities of ferret canines, preparation depth and bases were compared as to their effect on odontoblasts and to rate of dentin formation. These were measured by injecting 3H-proline at 0, 20 and 40 days post-preparation. Odontoblast activity was determined by label density in each band; inter-band distances indicated the amount of dentin formed. Correlations were by Pearson's coefficient. The following were determined: 1) cavity depth (remaining dentin thickness) was the major factor in odontoblast response and in dentin formation; deeper cavities suppressed odontoblasts with less subsequent dentin formation at all time periods; 2) basing materials had little effect on odontoblast activity or on the rate of dentin formation. An exception was in deep cavities, with Ca(OH)2 showing more label; this activity was temporary with no increased dentin formation; 3) there was no evidence of a "rebound" response.

Animals↗
PubMed2004

Temperature rise in the pulp chamber induced by a conventional halogen light-curing source and a plasma arc lamp.

PURPOSE: To assess and compare the pulp chamber temperature increase during resin-based composite polymerization with two different light-curing units. METHODS: A Class I cavity was prepared in an extracted lower molar under standardized conditions using a specially designed industrial robot system. The dentin layer between the pulp chamber and the floor of the cavity was 1 mm thick. Pulp chamber temperature rises (starting temperature: 20.0 +/- 0.1 degrees C) were recorded for four different series of investigations using both the halogen curing lamp Elipar Visio (light-curing: 40 s) and the plasma arc lamp Apollo 95E (light-curing: 3 seconds): Group A: Operation of the light-curing units directly over the untreated, empty cavity; Group B: Resin-based composite polymerization without previously applied cement base or bonding agent; Group C: Resin-based composite polymerization with a previously applied cement base; Group D: Resin-based composite polymerization with a previously applied bonding agent. In each of the four groups 10 measurements were carried out for every light-curing unit. Data were statistically analyzed using ANOVA, post-hoc Scheffé test and t-test. RESULTS: The lowest temperature increase (0.3 degrees C) was recorded during composite polymerization with a previously applied cement base using the Apollo 95E unit (Group C, P < 0.05). The highest temperature increase was induced when using the Elipar Visio unit directly over the untreated cavity (Group A, P < 0.05). In Groups A, C and D higher pulp chamber temperature measurements were obtained when using the Elipar Visio unit as compared to the Apollo 95E plasma arc lamp (P < 0.01). In Group B, no significant differences were recorded during the composite polymerization when using the two different light-curing units (P > 0.05).

Analysis of Variance↗
PubMed2004

Effect of three direct restorative materials on molar cuspal fracture resistance.

PURPOSE: This study compared the cusp fracture strength of molars restored using a condensable resin composite with that of teeth restored with conventional amalgam, a bonded amalgam, and an incrementally placed resin composite. METHODS: Standardized MOD cavity preparations (2/3 the buccal-lingual dimension x 4 mm deep) were made in 50 extracted human molars and restored as follows (n = 10): (1) a packable posterior resin composite; (2) an incrementally placed microfilled posterior resin composite; (3) a spherical particle amalgam alloy; (4) spherical amalgam with a dentin adhesive liner and (5) no restoration (preparation only; negative control). A sixth group of intact molars (n = 10) served as a positive control. Following storage and thermocycling, each specimen was tested for cuspal fracture strength. RESULTS: Cavity preparation reduced cuspal fracture strength by over 50%. The fracture strength of intact teeth was significantly greater than that of all other groups (P< 0.0001). None of the restorative procedures increased cuspal fracture resistance over that of prepared teeth.

Acid Etching, Dental↗
PubMed2004

Clinically controlled study on the quality of class III, IV and V composite restorations after two years.

PURPOSE: The quality of fillings consisting of a hybrid composite was compared with fillings consisting of two different microfilled composites in a clinical examination. MATERIAL AND METHODS: Within the design of a clinically controlled two-year study conducted under practice-relevant conditions, the composites C-Fill MH (Megadenta), Helio Progress (Vivadent), and Visio-Dispers (ESPE) were examined in anterior-tooth cavities in 134 patients by means of the split-mouth technique. The clinical examinations were performed based on modified Ryge criteria (marginal integrity, anatomical form, secondary caries, color, marginal discoloration, surface roughness) after 12 and 24 months. RESULTS: Immediately following filling application, all evaluation criteria except color were assessed as level A. After 12 and 24 months, C-Fill MH was found to be significantly superior to the other materials with regard to marginal integrity, color, and marginal discoloration. CONCLUSION: The hybrid composite C-Fill MH seems to be superior to the microfilled composites and should therefore be preferred as a restorative filling material.

Adult↗
PubMed1992

A retrospective cohort evaluation of preventive resin restorations.

This study measured the longevity and clinical success of preventive resin restorations (PRRs) placed in permanent teeth by multiple operators in the Pediatric Dentistry Clinic at the University of Minnesota. A retrospective chart audit identified patients who had one or more PRRs placed. Only restorations of the occlusal surfaces of the first or second permanent molars were included. Each patient was given a dental examination. On completion, the patient's chronological record of treatment was reviewed for the following information: experience of the operator, type of isolation used, bonding material, liner type, composite resin, and sealant type. Teeth were examined with a front surface dental mirror and a sharp No. 23 dental explorer. Evaluations were made according to criteria developed by Cvar and Ryge, but modified to include a sealant evaluation. Independent measurements were made by each of the two examiners and a consensus was obtained. One hundred restorations were examined in 64 patients. The mean duration of service was 27 +/- 13 months. Sealant was evaluated as alfa (complete) 26 per cent, bravo (incomplete/adequate) 48 per cent, charlie (incomplete/inadequate) 21 per cent and delta (lost) five per cent. Cavosurface discoloration was evaluated as alfa (none) 87 per cent, bravo (margin only) 12 per cent, and charlie (margin/proceeding toward pulp) one per cent. Anatomical form was evaluated as alfa (well contoured) 89 per cent, bravo (under contoured/dentin not exposed) 11 per cent. Marginal adaptation was evaluated as alfa (no visible crevice) 85 per cent, bravo (visible crevice/no dentin exposed) 12 per cent, charlie (visible crevice/dentin exposed) two per cent and delta (restoration missing) one per cent.(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗
PubMed2004

On the diagnosis and management of neurocutaneous syndrome, a toxicity disorder from dental sealants.

Neurocutaneous syndrome, a newly discovered toxicity disorder, is characterized by neurological sensations, pain, depleted energy, and memory loss as well as itchy cutaneous lesions that may invite various opportunistic infections. Components in the calcium hydroxide dental sealants Dycal, Life and Sealapex have been identified as sources of the observed symptoms. Sulfonamide and neurological toxicity issues are discussed, and three case histories are presented. Additional notes on zinc oxide, Fynal, IRM, and Sultan U/P sealers are also included. Diagnostic and management protocols at the Parasitology Center, Inc., are proposed.

Adult↗
PubMed2005

Restoring the interproximal zone using the proximal adaptation technique--Part 2.

In this era of modern adhesive dentistry, clinicians are still faced with challenges from microleakage, recurrent decay, and sensitivity. Many of the challenges are a result of using yesterday's restorative techniques and principles with the new formulations of biomaterials. Procedures such as the proximal adaptation and the oblique layering techniques offer modifications to the nonadhesive principles discussed in Part I (The Compendium, December 2004), while providing the patient and clinician with the 3 primary objectives of restorative dentistry: prevention, preservation, and conservation. Using stratification techniques and thorough adhesive protocol as illustrated in this article allows clinicians to provide restorations that have improved physical characteristics while reducing the effects of polymerization shrinkage. Other benefits of these adhesive procedures include enhanced chromatic integration, ideal anatomical form and function, optimal proximal contact, improved marginal integrity, and longer lasting directly placed composite restorations.

Adult↗