Comparative Study Regarding the Compressive Strength of Different Composite Resins Used for Direct Restorations

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The aims of the study were to characterise the resin-resin interface when a universal bonding agent (UBA) was used in two different strategies in direct composite repair and to evaluate the bonding capacity of UBA by microleakage assessment. In study groups a micro-filled hybrid and a nano-filled hybrid composite resins were aged in order to simulate an old restorations. As a repair material was chosen the same micro-filled hybrid composite resin that was used as an old restoration. UBA was applied in etch-and-rinse and self-etch strategies and was used as an intermediate layer in repair procedure. After the repair the samples were aged again. In control groups were included non-aged, repaired composite resins samples. The resin-resin interface was characterised on SEM images and the microleakage at the interface was evaluated by dye penetration assessment. Universal bonding agent used in direct composite resins repair showed a very good adaptation to non-aged micro-filled hybrid and nano-filled hybrid composite resins. Aging by saliva storage of repaired composite resins leaded to an enlargement of resin-resin junction and a increased microleakage irrespective of the strategy (etch-and-rinse or self -etch) used for bonding agent application. Etch-and-rinse strategy for universal bonging agent application determined a better interface bonding when compared to self -etch strategy.

Section: Resultsmentioning

confidence: 99%

Evaluation of Adhesive Capacity of Universal Bonding Agents Used in Direct Composite Resins Repair

Stoleriu¹,

Andrian²,

Nica³

et al. 2017

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“…There are some disadvantages when using these materials: doubtable adaptation to the cavity walls [1], voids formation in the bulk material [2] and difficulties when displacing the material from the syringe. In the complex environment of oral cavity, these materials are prone to degradation [3][4][5][6][7] and the tooth-material adhesion to breaking. Efforts were made in time in order to improve marginal adaptation of these composite resins, by controlling the polymerization shrinkage [8][9][10], by placing a flowable composite resin as an intermediate layer [11] or by reducing the viscosity of these highly filled composite using preheating [12][13][14][15].…”

mentioning

confidence: 99%

Evaluation of Pre-heating Effects on Marginal Adaptation of Resin-based Materials

Taraboanta¹,

Stoleriu²,

Iovan³

et al. 2018

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The aim of the study was to compare the marginal adaptation of three different resin-based materials used for direct restoration: hybrid composite resin (Gaenial Posterio, GC Corporation), a compomer (Dyract eXtra, Dentsply Sirona), and a giomer (Beautifil II, Shofu Dental) applied at room temperature or after preheated at preheating 50 and 60oC. Class II cavities were prepared on proximal surfaces of extracted teeth and randomly divided in 3 groups according to the material used for restoration. In each group five cavities were restored using the materials at room temperature (subgroup 1), five cavities were restored using preheated materials at 50şC (subgroup 2), and five cavities were restored using preheated materials at 60şC (subgroup 3). The teeth were stored in distilled water for 14 days and then were immersed in 2% methylene blue buffered dye solution (pH = 7) for 4 hours. The teeth were transversally cut and the sections were examined using optical microscope (Carl-Zeiss AXIO Imager A1m) at 50x magnification and the dye penetration was evaluated according to 4 scores. Decreased microleakage and fewer gap formation were recorded for all filling materials after they have been heated at 50 or 60oC. Pre-warming of resin-based materials improves the adaptation of these materials to tooth structures.

“…Our images did not reveal the infiltration zone or the presence of tag-like microstructures. Some of the reasons could be related to the preparation of the specimen, which involved cutting procedures resulting in smear layer formation on the samples surfaces and storage in distilled water which might exert a corrosive effect [32]. However, our results support the hypothesis of an intimate contact between Biodentine and the dental tissues, resulting in good sealing at the margins and walls of the restoration.…”

Section: Results Of the Sem Studymentioning

confidence: 51%

Influence of Dental Humidity on Marginal Adaptation of Biodentine Restorations

Iovan¹,

Solomon²,

Stoleriu³

et al. 2019

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Biodentine is a tricalcium silicate cement used as a dentin replacement in restorative dentistry. The aim of this study was to assess the influence of cavity moisture on the immediate sealing and morphology of the interface between Biodentine and the dental tissues. 20 class II cavities were prepared in extracted teeth. 10 cavities were dried using the air spray before restoring with Biodentine and 10 cavities were preserved moist for the restorative procedure. The teeth were subjected to a microleakage test and then the axial sections were observed under optical microscope and scanning electron microscope. In most situations Biodentine provided an immediate good marginal sealing and a tide contact with adjacent tissues in both occlusal and cervical margins which did not seem to be influenced by the moisture of the dental supporting tissues.