Mechanical Degradation of Different Classes of Composite Resins Aged in Water, Air, and Oil.

A significant deterioration of the properties can drastically compromise the survival rate of restorative materials. The aim of this study was to assess flexural strength and hardness of three composite classes: hybrid composite resin (HCR), nanoparticulate composite resin (NCR), and silorane-based composite resin (SBCR). One hundred specimens were prepared for hardness testing by using a split metallic mold measuring 10 mm in diameter and 2 mm deep. Twenty specimens were prepared for each restorative material, randomly assigned for storage in air, distilled water, or mineral oil. After intervals of 24 hours, 30, 60, 90, and 120 days, hardness and flexural strength tests were initially compared in two levels: "storage medium" and "time" within each material group. A two-way analysis of variance was performed (p<0.05) on the variables "material" and "storage time" (p<0.05). The HCR showed to be stable with regard to the evaluation of flexural strength and hardness (p<0.05). A significant reduction occurs for the NCR in comparison to the other groups (p<0.05). The NCR presented the lowest values of hardness and flexural strength kept on water over time. The characteristics of material showed a strong influence on the decrease of the mechanical properties analyzed.

Does Classification of Composites for Network Meta-analyses Lead to Erroneous Conclusions?

OBJECTIVES: Composites can be classified differently, according to manufacturer information, filler particle size, resin-monomer base, or viscosity, for example. Using clinical trial data, network meta-analyses aim to rank different composite material classes. Dentists then use these ranks to decide whether to use specific materials. Alternatively, annual failure rates (AFRs) of materials can be assessed, not requiring any classification for synthesis. It is unclear whether different classification systems lead to different rankings of the same material (ie, erroneous conclusions). We aimed to evaluate the agreement of material rankings between different classification systems. METHODS: A systematic review was performed via MEDLINE, Cochrane Central Register of Controlled Trials, and EMBASE. Randomized controlled trials published from 2005-2015 that investigated composite restorations placed in load-bearing cavitated lesions in permanent teeth were included. Network meta-analyses were performed to rank combinations of composite classes (according to manufacturer, filler particle size, resin-monomers, viscosity) and adhesives. Material combinations were additionally ranked using AFRs. RESULTS: A total of 42 studies (6088 restorations, 2325 patients) were included. The ranking of most material class combinations showed significant agreement between classifications ( R2 ranged between 0.03 and 0.56). Comparing material combinations using AFRs had low precision and agreement with other systems. AFRs were significantly correlated with follow-up periods of trials. CONCLUSION: There was high agreement between rankings of identical materials in different classification systems. Such rankings thus allow cautious deductions as to the performance of a specific material. Syntheses based on AFRs might lead to erroneous results because AFRs are determined by follow-up periods and have low precision.

Avaliação da Ocorrência da Fenda Marginal em Restaurações de Resina Composta / Occurrence Evaluation of the Marginal Gap in Composite Resin Restorations

O objetivo do estudo foi avaliar a ocorrência da fenda marginal em restaurações de resinas flow, com e sem ciclagem termomecânica. Utilizou-se neste estudo 60 incisivos bovinos. Os preparos cavitários foram padronizados por meio de um dispositivo que proporcionou preparos uniformizados realizados com uma ponta diamantada (3286P-KG Sorensen). O sistema adesivo Single Bond Universal (3MESPE) foi aplicado e os compósitos foram utilizados: FILTEK BULK FILL FLOW (3MESPE), ADMIRA FUSION FLOW (VOCO) e FILTEK Z350 XT FLOW (3M ESPE). Metade dos espécimes foram submetidos à ciclagem termomecânica. Foi realizada a avaliação da área da fenda marginal por meio da medição no microscópio óptico DISCOVERY V20 (ZEISS). Os valores de média e desvio-padrão de área da fenda marginal (µm²) obtidos nos 6 grupos estudados foram: FBNC = 332,75 ± 214,76; AFNC = 376,20 ± 196,04; FZNC = 861,12 ± 393,68; FBC = 951,68 ± 273,67; AFC = 598,82 ± 392,60; FZC = 1157,59 ± 563,76. O teste ANOVA dois fatores apresentou o valor de p< 0,05 para ambos os fatores, o teste de Tukey a 5% mostrou média e desvio padrão (µm²) para o fator envelhecimento: com ciclagem = 902,70 ± 455,37ª; sem ciclagem = 523,35 ± 345,28ᵇ, e para o fator resina composta mostrou média e desvio padrão (µm²): FZ = 1009,36 ± 466,43ª; FB = 642,21 ± 399,27ªáµ‡; AF = 487,51 ± 307,80ᵇ. A ciclagem termomecânica resultou no aumento da área da fenda marginal, a resina AF apresentou resultados superiores em relação á FZ. A resina FB não apresentou diferenças em relação as demais(AU)

The aim of this study was to evaluate the occurrence of marginal gap of different restorations, using different flowable composite, with and without thermo mechanical cycling. 60 incisive bovine tooth were used. The cavity preparations were standardized by means of a device that provided uniform preparations made with a diamond bur (3286P, KG Sorensen, Barueri, SP, Brazil). Universal Single Bond (3M) adhesive system was applied and the composites were applied: FILTEK BULK FILL FLOW (3M), ADMIRA FUSION FLOW (VOCO) e FILTEK Z350 XT FLOW (3M). Half of each group were submitted to thermo cycling. Evaluation of marginal gap were done by optical microscopy DISCOVERY V20 (ZEISS). The mean and standard deviation values of the marginal gap area (µm²) obtained in the 6 groups studied were: FBNC = 332,75 ± 214,76; AFNC = 376,20 ± 196,04; FZNC = 861,12 ± 393,68; FBC = 951,68 ± 273,67; AFC = 598,82 ± 392,60; FZC = 1157,59 ± 563,76. The twoway ANOVA presented p lesser than 0.05 for both factors, the Tukey test at 5% showed mean and standard deviation (µm²) for termo mechanical cycling factor: Cycling = 902,70 ± 455,37ª; No cycling = 523,35 ± 345,28ᵇ and for composite resin factor: FZ = 1009,36 ± 466,43ª; FB = 642,21 ± 399,27ªáµ‡; AF = 487,51 ± 307,80ᵇ. The thermomechanical cycling resulted in an increase in the marginal gap area; and the composite AF presented statistically superior results in relation to FZ. The FB composite showed no differences in relation to the other composites(AU)

Release of monomers from composite dust.

OBJECTIVES: Dental personnel are more at risk to develop asthmatic disease, but the exact reason is so far unknown. During abrasive procedures, dental personnel are exposed to nano-sized dust particles released from dental composite. The aim of this study was to investigate whether respirable composite dust may also release monomers. METHODS: Respirable (<5µm) composite dust was collected and the release of methacrylate monomers and Bisphenol A (BPA) in water and ethanol was evaluated by liquid chromatography/mass spectroscopy (LC-MS/MS). The dust was ultra-morphologically and chemically analyzed by transmission electron microscopy and energy-dispersive X-ray spectroscopy (TEM-EDS). RESULTS: LC-MS/MS analysis revealed that, irrespective of the type of composite, the respirable fraction of composite dust may release relatively high concentrations of unpolymerized methacrylate monomers, both in water and ethanol. Higher release was observed in ethanol. The endocrine disruptor BPA also emanated from the composite dust particles. TEM showed that most particles were nano-sized, although particle size ranged between 6nm and 5µm with a mode value between 12 and 39nm. Most particles consisted of several filler particles in resin matrix, although single nano-filler particles could also be observed. Elemental analysis by TEM-EDS proved that the particles collected on the filters originated from the dental composites. CONCLUSION: Theoretically, composite dust may function as a vehicle to transport monomers deeply into the respiratory system. The results of this study may shed another light on the increasing incidence of respiratory disease among dental personnel, and more care should be taken to prevent inhalation of composite dust. CLINICAL SIGNIFICANCE: Special care should be taken to prevent inhalation of composite dust, as the dust particles may release methacrylate monomers.

[Curing mode of universal adhesives affects the bond strength of resin cements to dentin].

OBJECTIVE: To determine the effects of curing mode of one-step and two-step universal adhesives on the micro-tensile bond strength (µTBS) of different dual-cure resin cements to dentin. METHODS: One-step universal adhesive Single Bond Universal (SBU), and two-step universal adhesive OptiBond Versa (VSA) were chosen as the subjects, one-step self-etching adhesive OptiBond All in One (AIO) and two-step self-etching adhesive Clearfil SE Bond (SEB) were control groups, and two dual-cure resin cements RelyX Ultimate (RLX) and Nexus 3 Universal (NX3) were used in this study. In this study, 80 extracted human molars were selected and the dentin surface was exposed using diamond saw. The teeth were divided into 16 groups according to the adhesives (AIO, SBU, SEB, VSA), cure modes of adhesives (light cure, non-light cure) and resin cements (RLX, NX3). The adhesives were applied on the dentin surface following the instruction and whether light cured or not, then the resin cements were applied on the adhesives with 1 mm thickness and light cured (650 mW/cm(2) for 20 s. A resin was built up (5 mm) on the cements and light cured layer by layer. After water storage for 24 h, the specimens were cut into resin-cement-dentin strips with a cross sectional area of 1 mm×1 mm and the µTBS was measured. RESULTS: Regarding one-step universal adhesive (SBU) light cured, the µTBS with RLX [(35.45±7.04) MPa] or NX3 [(26.84±10.39) MPa] were higher than SBU non-light cured with RLX [(17.93±8.93) MPa)] or NX3 [(10.07±5.89) MPa, P<0.001]. Compared with AIO, light-cured SBU combined with RLX presented higher µTBS than AIO group [(35.45±7.04) MPa vs. (24.86±8.42) MPa, P<0.05]. When SBU was not lighted, the µTBS was lower than AIO [(17.93±8.93) MPa vs. (22.28±7.57) MPa, P<0.05]. For two-step universal adhesive (VSA) and control adhesive (SEB), curing mode did not affect the µTBS when used with either RLX or NX3 (25.98-32.24 MPa, P>0.05). CONCLUSION: Curing mode of one-step universal adhesive may affect the µTBS between dual-cure resin cements and dentin, while for two-step universal adhesive, the curing mode and the type of resin cements did not influence the µTBS.

Own brand label restorative materials-A false bargain?

OBJECTIVES: This study aims at evaluating and comparing mechanical, chemical, and cytotoxicological parameters of a commercial brand name composite material against two 'own brand label' (OBL) composites. METHODS: Parameters included depth of cure, flexural strength, degree of conversion, polymerization shrinkage, filler particle morphology and elemental analyzes, Vickers hardness, surface roughness parameters after abrasion, monomer elution, and cytotoxicity. RESULTS: The conventional composite outperformed the OBLS in terms of depth of cure (p<0.001), degree of cure at the first and last time intervals (p<0.001), hardness (p<0.001), and post-abrasion roughness (p<0.05). The polymerization volumetric shrinkage ranged from 2.86% to 4.13%, with the highest shrinkage seen among the OBLs. Both Monomer elution from the OBLs was statistically significantly higher (p<0.001). Statistically significantly higher cytotoxicity combined with altered morphology and loss of confluence was detected in the cells exposed to extracts from the OBLs. CONCLUSIONS: The OBLs were in general outdone by the conventional composite. CLINICAL SIGNIFICANCE: OBLs restorative materials have become pervasive in the dental market. Manufacturers often promise equal or better characteristics than existing brand-name composites, but at a lower price. Dentists are highly recommended to reconsider utilization of OBLs lacking sound scientific scrutiny, and our findings underscore this recommendation.

Repairabilitiy of aged resin composites mediated by different restorative systems / Reparo de resinas compostas envelhecidas e mediadas por diferentes materiais restauradores

The aim of this study was to evaluate the shear bond strengthof resin composite repairs with and without aging of thesurface to be repaired, using different adhesive systems andresin composites. Ninety specimens were prepared: 10 for theControl Group (GC - without repair); 40 for Group I (GI -repairs after 7 days) and 40 for Group II (GII - repairs after180 days). Groups I and II were divided into 4 subgroups of10 specimens each, according to the adhesive system andcomposite resin used: A) Adper Scotch Bond Multipurpose +Filtek Z350 XT; B) Adper Single Bond Plus + Filtek Z350 XT;C) Adper Scotch Bond Multipurpose + Esthet-X; D) AdperSingle Bond Plus + Esthet-X. The specimens were tested forshear strength in a universal testing machine. The resultswere analyzed by two-factor one-way ANOVA and Fisher’spost hoc tests (alpha=0.05). The control group had betterperformance than the other groups. There was no significantdifference when comparing different adhesive systems andcomposite resins. Repairs performed at 7 days were betterthan those performed at 180 days. The composite repairsdecreased the mechanical strength of the restoration. Agingof the resin substrate may decrease repair bond strength overtime, regardless of the type of adhesive systems and resin composites used.

Avaliar a resistência de união ao cisalhamento de reparos deresina composta com e sem envelhecimento da superfície a serreparada, utilizando diferentes sistemas adesivos. Noventacorpos de prova foram confeccionados sendo: 10 para o GrupoControle (GC - sem reparo); 40 para o Grupo I (GI - reparosapós 7 dias) e 40 para o Grupo II (GII – reparos após 180 dias).Para os reparos, os grupos GI e GII foram subdivididos em 4subgrupos com 10 corpos de prova, variando o sistema adesivoe a resina composta: A) Adper Scotch Bond Multipurpose+Filtek Z350XT; B)Adper Single Bond Plus+ Filtek Z350XT;C)Adper Scotch Bond Multipurpose+ Esthet-X; D) AdperSingle Bond Plus+ Esthet-X. Os corpos de prova foramsubmetidos a uma força de cisalhamento em uma máquina deensaio universal (EMIC). Os resultados foram analisados peloteste estatístico Anova dois fatores, seguido pelo teste deFisher ́s. Observou-se melhor comportamento do grupocontrole sobre os demais grupos, além disso, os reparosrealizados aos 7 dias foram superiores aos dos realizados em180 dias. Não houve diferença significativaquando secomparou diferentes sistemas adesivos e resinas compostas.Os reparos de resina composta diminuem a resistênciamecânica da restauração.O envelheci mento do substrato deresina pode diminuir a resistência ao reparo ao longo dotempo, independentemente do tipo de sistemas adesivos eresinas compostas utilizados.

Class II Resin Composites: Restorative Options.

Tooth-coloured, resin composite restorations are amongst the most frequently prescribed forms of dental restoration to manage defects in posterior teeth. The attainment of a desirable outcome when placing posterior resin composite restorations requires the clinician to have a good understanding of the benefits (as well as the limitations) posed by this material, together with a sound knowledge of placement technique. Numerous protocols and materials have evolved to assist the dental operator with this type of demanding posterior restoration. With the use of case examples, four techniques available are reported here. CPD/Clinical Relevance: This article explores varying techniques for the restoration of Class II cavities using resin composite.

The Use of Resin-based Composite in Children: An Update.

Resin-based composites are an integral component of contemporary pediatric restorative dentistry. They can be utilized effectively for preventive resin restorations, moderate Class II restorations, Class III restorations, Class IV restorations, Class V restorations, and strip crowns. Tooth isolation to prevent contamination is a critical factor, and high-risk children may not be ideal candidates for resin-based composite restorations. Important factors to consider during composite placement are isolation, polymerization shrinkage, and extent of restoration. When utilized correctly, resin-based composites can provide excellent restorations in the primary and permanent dentition. The purpose of this paper was to update previous publications that addressed the use of resin-based composites in children with accepted recommendations through a Pediatric Restorative Dentistry Consensus Conference.

Does a consistently reliable solution exist for the successful placement of Class II composite resin restorations?

Many restorative dentists cobble together materials and techniques from different manufacturers to create systems that work for their clinical needs. The author proposes that it may be possible to improve outcomes and continue toward excellence by selecting the ideal restorative solution with materials designed, tested, and intended to be used together. DENTSPLY Caulk's Class II solution is examined in this article as a means for helping in placement of posterior restorations, namely Class II restorations. A case report is explored.

Investigations towards nano-hybrid resin-based composites.

OBJECTIVE: Clinical data indicate an increased trend in material fracture as reason for failure in composite restorations, questioning whether modern resin-based composites (RBCs) are able to fulfil the rising aesthetical demands and to provide at the same time a sufficient mechanical stability also in larger cavities. Nano-hybrid RBCs are promoted as materials with improved mechanical properties. The aim of this study was to analyse differences in mechanical properties within and between modern flowable and non-flowable nano-hybrid and micro-hybrid RBCs by measuring mechanical properties at macro- and micro-scale. METHODS: Thirty-four RBCs with traditional and new monomer formulation or photo-polymerization initiator technology-15 nano-hybrid, nine micro-hybrid and ten flowable-were therefore considered. Flexural strength, flexural modulus (E(flexural)), indentation modulus, Vickers hardness (HV) and creep were measured after the samples had been stored in water for 24 h at 37°C. Differences within the materials as well as within material categories were statistically analysed using one-way ANOVA with Tukey HSD post hoc test (α = 0.05) as well as partial eta-square statistics. RESULTS: The category of micro- and nano-hybrid RBCs performed in all properties superior compared to the flowable RBCs. The former two categories differ significantly only with regard to three parameters, with nano-hybrid RBCs showing higher HV respectively lower E(flexural) and filler weight. The micro-mechanical parameters proved to be more sensitive to differences in filler amount and RBCs type than the macro-mechanical properties. CLINICAL RELEVANCE: Only few differences were found between nano-hybrid and micro-hybrid RBCs as a material category and thus, from laboratory tests, no clear advantages in the mechanical stability in stress-bearing areas of nano-hybrid RBCs are expected clinically. Similar is valid for materials with new monomer formulation or photo-polymerization initiator technology. However, several of the measured nano-hybrid RBCs showed consistently higher mechanical properties than the mean values of the micro-hybrid RBCs.

Repair of dental resin-based composites.

OBJECTIVES: The study analyzed the reparability and compatibility of light-curing resin-based composites (RBCs) of the categories "microhybrid," "nanohybrid," and "packable." MATERIALS AND METHODS: Six RBCs with different matrix and filler formulation--purely methacrylate-based composites (MBCs), ormocer-based composites (OBCs), and silorane-based composites (SBCs)--were used for the specimens. Every material was combined with itself and with the other five RBCs, resulting in a total of 36 combination groups (n = 20). The specimens were polymerized, aged for 8 weeks in distilled water at 37 °C, and then repaired by means of a repair kit. Shear bond strength and fracture mode were measured after aging of the specimens, undergoing storage for 24 h in distilled water at 37 °C followed by thermocycling (5,000 cycles, 5-55 °C) and an additional 4-week storage in distilled water at 37 °C. RESULTS: Data were statistically analyzed using ANOVA with TUKEY HSD post hoc test (α = 0.05). On average, the OBC Admira reached the highest value as a substrate material (30.41 MPa), and the SBC Filtek Silorane reached the lowest value (8.14 MPa). Filtek Silorane was identified as the repair material with the highest bond strength value (28.70 MPa), while a packable composite reached the lowest bond strength value (15.55 MPa). The analysis of the break modes showed that adhesive breaks are typical when strength is at its lowest (6.27 MPa). A large number of cohesive fractures are conspicuous when identical materials are used for repair, except Filtek Silorane (2 % cohesive fractures). CONCLUSIONS: The study demonstrated that the effect of the different materials on bond strength varies strongly, depending on whether the material is used as filling or as repair material. CLINICAL RELEVANCE: It is generally advisable but not compulsory to combine identical RBCs.

Er,Cr:YSGG laser influence on microleakage of class V composite resin restorations.

One of the most challenging issues following restoration is microleakage. The aim of this study was to investigate the effects of Er,Cr:YSGG laser with and without acid etching on microleakage of class V composite restorations. A total of 68 human intact premolars were selected, disinfected, and randomly allocated to four experimental groups (n = 16) as well as positive and negative controls (n = 2 each). Dimensionally, similar class V cavities were prepared on buccal surface of each tooth under the following conditions: group 1, bur cavity preparation and chemical etching (BE); group 2, bur cavity preparation and Er,Cr:YSGG laser conditioning (BLc); group 3, Er,Cr:YSGG laser cavity preparation and chemical etching (LE); and group 4, Er,Cr:YSGG laser cavity preparation and Er,Cr:YSGG laser conditioning (LLc). All samples were restored with composite. The teeth were sealed and immersed in 1 % methylene blue for 48 h before being sectioned. The microleakage evaluation was done under a stereomicroscope (×20). The leakage scores were recorded and Kruskal-Wallis and Mann-Whitney tests were used for statistical evaluations. The highest microleakage score was seen in gingival margins of group 4 (LLc) and the lowest in occlusal margins of group 3 (LE). The overall difference in leakage scores among the groups was statistically significant (p < 0.001) with gingival margins showing a significantly higher score than its occlusal counterparts (p < 0.001). It was noted that less microleakage could be achieved when cavities were prepared by laser compared to bur. In addition, less microleakage was seen in acid-etched cavities than laser-conditioned counterparts.

Bonded functional esthetic prototype: an alternative pre-treatment mock-up technique and cost-effective medium-term esthetic solution.

As the economy has receded in recent years, many patients have been inclined to reject dental treatment beyond what they feel is the minimal amount necessary. Increasingly, there has been reluctance to take on the expense of full-mouth restorations and time-consuming procedures. Consequently, clinicians can benefit from innovative, conservative, interim solutions that enable them to provide segment treatment with long-term stability and esthetics, with lower initial cost. The bonded functional esthetic prototype (BFEP) allows fabrication of up to 14 teeth from composite in 1 hour, providing either a pre-treatment restoration or a long-term provisional solution until further treatment can be completed. As demonstrated herein, the BFEP enables superb function, stability, and esthetics in the interim while dispersing the cost of definitive treatment over time.

Two- and three-body wear of composite resins.

OBJECTIVE: The aim of the present study was to investigate two- and three-body wear of microfilled, micro-hybrid and nano-hybrid composite resins using a ball-on-disc sliding device. METHODS: One microfilled (Durafill VS), one micro-hybrid (Filtek Z250), one hybrid (Clearfil AP-X), one nanofilled (Filtek Supreme XT), and two nano-hybrid (MI Flow, Venus Diamond) composite resins were examined. The composites were filled in a cylindrical cavity, and light polymerized. After storage in 37°C distilled water for 7days, all specimens were tested with a custom-made ball-on-disc sliding device with a zirconia ball as antagonist (50N loads, 1.2Hz, 10,000 cycles) immersed in water, poppy seed slurry and polymethyl methacrylate slurry, respectively. Maximum wear depth and volume loss of worn surfaces were quantified by a digital CCD microscope and analyzed with two-way analysis of variance. RESULTS: The interactions between composite resin and condition of their maximum wear depth and volume loss were significant (p<0.01). The abrasive wear produced at three-body loading with poppy seed slurry was very large for the microfilled composite, and small for all other composites tested. In contrast, two-body wear of the microfilled composite, and one nano-hybrid composite was very low. SIGNIFICANCE: The ball-on-disc sliding device used is considered suitable to simulate sliding of an antagonist cusp on an opposing occlusal composite restoration, either in the two- or the three-body wear mode. All tested materials except for the microfilled composite showed low surface wear when exposed to poppy seed as the third-body medium.

Composite resin: a versatile, multi-purpose restorative material.

Introduced more than some 50 years ago, composite resin technology has simplified the manner in which clinicians practice restorative dentistry, offering greater predictability and improved physical properties. Decades of material science and laboratory development along with clinical trials in human subjects have culminated in composite resin being validated as a reliable, multifunctional restorative material. With a wide range of composite resins available today, clinicians can benefit from knowing the infrastructure of a given material in order to determine which type will work best in a particular clinical situation.

Attrition and erosion: restorative planning and performance.

The number of patients presenting with severe attrition and associated erosion is increasing in frequency. Treatment of this patient group is very challenging as it is simply not just a case of replacing lost tooth tissue, but also trying to identify and then eliminate the aetiological factors responsible for the loss of tooth structure. In most cases restorative treatment involves extensive rehabilitation of the dentition to restore the aesthetics and function and also to prevent further tooth loss. Such treatment often involves a multidisciplinary approach to eliminate and/or reduce causative factors prior to definitive restoration of teeth. Treatment needs to focus on quick intervention when the problem has been identified and diagnosed. Restorative treatment involves careful if not complex planning culminating in the establishment of a well defined and ongoing maintenance plan. Long-term success of treatment is centred on the maintenance phase. Current restorative options include the use of extensive resin composite build-ups. This is often the best initial starting point as it allows for adjustments, as well as being a reversible and more conservative procedure. The use of indirect restorations is likely to provide a longer lasting outcome after initial stabilization, whether it is metal- or ceramic-based or a combination.

Viscoelastic properties of low-shrinking composite resins compared to packable composite resins.

The aim of this study was to evaluate the viscoelastic properties of novel low-shrinking composites and compare them to those of packable composites. Six materials were tested: Clearfil Majesty Posterior (CM), ELS Extra Low Shrinkage (EL), Filtek P60 (FP), Filtek Silorane (FS), Prodigy (PR) and Surefil (SU). Static and dynamic testing was performed and materials were tested dry and wet at different temperatures (21°C to 50°C). Shear and flexural modulus, loss tangent, dynamic viscosity, Poisson's ratio and creep recovery were calculated among others. Significant differences were found both between the two groups and between materials belonging to the same group. CM presented the highest shear and flexural modulus and EL the lowest. All materials were softened by an increase of temperature, while FS was the least affected by water and PR showed to be the most susceptible. Different approaches used to overcome polymerization shrinkage lead to materials with different properties.