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PubMed2001

[Single-tooth impressions using metal-resin matrixes].

The metallic-resinous frame impression technique is based on the impression of single abutments encompassed in a global one, with or without transfert copings. For single tooth impression, this technique is the easiest and the most practical alternative to the one using thermoplastic paste. The aim of this article is to describe, step-by-step, the impression taking procedures using the metallic-resinous frame technique.

Acrylic Resins↗
PubMed2006

In vivo and in vitro evaluation of Class II composite resin restorations with different matrix systems.

PURPOSE: To investigate in vivo and in vitro Class II composite restorations performed with two matrix and wedge systems. MATERIALS AND METHODS: One hundred nine Class II restorations were performed in 23 patients, 59 with metallic matrices and wooden wedges (group 1) and 50 with polyester matrices and reflective wedges (group 2). All cavities were restored using Single Bond and P-60 (3M ESPE). In the metal matrix group, polymerization was performed from the occlusal, and in the polyester group through the reflective wedge. To assess microleakage, 40 proximal standard slot cavities were prepared in 20 noncarious human third molars. In the mesial cavity, the gingival margin was located at the enamel level, and in the distal cavity at the cementum/dentin. Specimens were randomly divided into two groups (n = 20) and restored with Single Bond, Z-250 (3M ESPE), and the same techniques used in the in vivo study: metal matrix/wooden wedge (group 1) and polyester matrix/reflective wedge (group 2). Specimens were thermocycled (500 times, 5 degrees C to 55 degrees C), then isolated with nail varnish and immersed in fuchsin for 8 h. Specimens were sectioned longitudinally and microleakage was assessed under magnification (40X) using a standard scoring system. RESULTS: Data were subjected to the chi-square test, Mann-Whitney U-test, and Kruskal-Wallis H-test. Matrix systems presented similar results in the clinical evaluation and the in vitro microleakage test of Class II composite restorations. Dye leakage was minimal at enamel margins, and statistically lower (p < 0.05) than at cementum/dentin margins. CONCLUSION: The different matrix systems had no influence on clinical performance or in vitro sealing ability of Class II composite restorations.

Adolescent↗
PubMed2006

Minimally invasive restorative dentistry: a biomimetic approach.

When providing dental treatment for a given patient, the practitioner should use a minimally invasive technique that conserves sound tooth structure as a clinical imperative. Biomimetics is a tenet that guides the author's practice and is generally described as the mimicking of natural life. This can be accomplished in many cases using contemporary composite resins and adhesive dental procedures. Both provide clinical benefits and support the biomimetic philosophy for treatment. This article illustrates a minimally invasive approach for the restoration of carious cervical defects created by poor hygiene exacerbated by the presence of orthodontic brackets.

Adolescent↗
PubMedDate not supplied

Composite matrix for large, non-wedgeable Class III or Class IV preparations with gingival or subgingival margins.

Dentists sometimes are required to place a matrix to restore large Class III or Class IV preparations that have gingival or subgingival margins or are prepared in rotated or malposed teeth. In these situations, dentists sometimes cannot place a wedge between the prepared tooth and a neighboring tooth because the wedge cannot engage enough interproximal tooth structure to firmly anchor both itself and a matrix strip. This article presents a technique for placing a matrix around such large, non-wedgeable Class III or Class IV preparations.

Composite Resins↗
PubMed2006

Influence of composite resin consistency and placement technique on proximal contact tightness of Class II restorations.

PURPOSE: To investigate the influence of composite resin consistency and placement technique on proximal contact tightness of Class II composite resin restorations. MATERIALS AND METHODS: A manikin model (KaVo Dental) was used with an artificial first molar in which a standardized MO preparation was ground. This preparation was duplicated 360 times. Cavities were restored using Clearfil Photo Bond (Kuraray) combined with one of three composite resins of different consistencies: a low-viscosity (X-Flow, Dentsply), a medium-viscosity (Clearfil AP-X, Kuraray) and a high-viscosity composite (Tetric Ceram HB, Ivoclar Vivadent). Each composite was combined with 6 different matrix systems and separation techniques (n = 20). Groups 1 and 2: precontoured metal circumferential matrix (KerrHawe 1101-c) in a Tofflemire retainer combined either with hand instrument (OptraContact, Ivoclar Vivadent) or separation ring (Composi-Tight Gold, Garrison Dental Solutions). Group 3: pre-contoured metal sectional matrix (Lite-Flex, Danville Materials) with separation ring. Groups 4 and 5: pre-contoured metal circumferential dead-soft matrix (Adapt SuperCap, KerrHawe) with or without separation ring. Group 6: flat metal circumferential matrix (OptraMatrix, Ivoclar Vivadent) in a Tofflemire-retainer with hand instrument (OptraContact). Proximal contact tightness was measured using the Tooth Pressure Meter (University of Technology, Delft). To determine the effect of experimental variables on the proximal contact tightness, a multiple linear regression model was constructed. RESULTS: Measurements in group 6 were not possible; therefore, this group was excluded. The use of medium- or high-viscosity instead of a low-viscosity composite resin resulted in statistically significantly tighter proximal contacts (p < 0.01). The use of a separation ring resulted in a large, statistically significant increase (p < 0.001) in contact tightness, while the use of a hand instrument resulted in a small, statistically significant increase of contact tightness (p = 0.017). No statistically significant differences were found when a dead-soft matrix or a sectional matrix was used instead of a Tofflemire (p = 0.159, p = 0.261, resp.). CONCLUSION: Use of a separation ring when restoring a Class II composite resin restoration has a greater influence on the obtained proximal contact tightness compared to the influence of the consistency of the composite resin.

Composite Resins↗
PubMed1991

Comparison of resistance features for complex amalgam restorations.

This study evaluated the resistance provided to complex Dispersalloy amalgam restorations by pins (Group 1), amalgapins (Group 2), and a peripheral shelf or shoulder (Group 3) or in combinations of pins plus peripheral shelf (Group 4), or amalgapins plus peripheral shelf (Group 5). The occlusal surfaces of 50 extracted maxillary molar teeth were ground to a flat surface 2 mm occlusal to the CEJ, and the roots were matched and embedded in acrylic resin 2 mm apical to the CEJ. The greatest faciolingual and mesiodistal dimensions of each tooth at the level of preparation were recorded and these two measurements were multiplied to give a product for each specimen. The teeth were then sorted by tooth sizes and equally distributed among the five groups. Each group of flattened teeth received a different resistance form configuration. Amalgam was condensed using a matrix; the bands and excess amalgam were removed 24 hours later and each amalgam "occlusal" surface was ground flat to standardize the restoration at a 4 mm occlusal height. A 1 mm 45 degrees bevel was prepared on the facio-occlusal angle of the amalgam, and each specimen was loaded in compression at 45 degrees in an Instron at a crosshead speed of 1 mm/min. The groups and their mean (SD) failure loads in Newtons were: Group 1: 1515 (274); Group 2: 1521 (244); Group 3: 578 (175); Group 4: 1199 (229); and Group 5: 1691 (298). A one-factor ANOVA and a Tukey B post-hoc analysis showed no differences between Groups 1, 2 and 5.(ABSTRACT TRUNCATED AT 250 WORDS)

Analysis of Variance↗
PubMedDate not supplied

Posterior composite technique utilizing directed polymerization shrinkage and a novel matrix.

A technique is described for novel placement of posterior composites. Two frequently encountered problems are eliminated with this technique: difficulty in achieving good interproximal contacts and composite shrinkage away from the tooth. The desirability of indirect composites is questioned in view of recent research and the technique for direct composites described.

Bicuspid↗
PubMed1988

Biologic attachment, growth, and differentiation of cultured human epidermal keratinocytes on a graftable collagen and chondroitin-6-sulfate substrate.

Repair of full-thickness burns requires replacement of both the dermal and the epidermal components of the skin. Use of tissue culture methods allows very large expansions of surface area to be covered by cultured normal human epidermal keratinocytes (HK). Porous and resorbable materials, such as collagen and chondroitin-6-sulfate membranes, may be expected to adhere to wounds and promote fibrovascular ingrowth better than grafts of cultured epidermal keratinocytes alone. This article demonstrates the in vitro formation of biologic attachments between HK and a collagen and chondroitin-6-sulfate dermal skin replacement. Dermal membranes are prepared as generic acellular sheets and stored in the dry state for extended periods. Subconfluent HK cultures in logarithmic phase growth can attach quickly to dermal membranes in vitro, form a confluent epithelial sheet on the surface of each membrane, and exhibit mitotic cells for at least 1 week in vitro. Transmission electron microscopy demonstrates the formation of hemidesmosomes, extracellular matrix, and banded collagen at the interface of the epidermal cells and the dermal membrane. By comparison, HK cultures as confluent sheets released enzymatically with Dispase do not attach to the dermal membranes in vitro, under the conditions tested, although complete coverage of the membrane by the cell sheets is obtained. Growth assays show that subconfluent HK cells retain sufficient growth potential to maintain logarithmic phase growth, but that HK cells disaggregated from confluent sheets become growth arrested in comparison. The composite material has discrete dermal and epidermal compartments, has total thickness comparable to split-thickness skin graft, and can be applied to full-thickness skin defects in a single procedure.

Burns↗