The heat evolved and temperatures attained during setting of restorative materials

Plant, C G; Jones, D W; Darvell, B.W.

doi:10.1038/sj.bdj.4803293

Cited by 76 publications

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“…The lack of difference may be explained by the fact that these studies used a smaller number of cycles. However, some studies showed that the structures involved are small, then the thermal changes are moderately rapid (20). Thus, long resting periods appear to be unnecessary, allowing accelerated simulation (21,22).…”

Section: Discussionmentioning

confidence: 99%

Influence of Thermal Cycles Number on Bond Strength of Metallic Brackets to Ceramic

et al. 2017

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The aim of this study was to evaluate the effect of different number of thermal cycles on the shear bond strength (SBS) of metallic orthodontic brackets bonded to feldspathic ceramic by a composite resin. Twenty-five ceramic cylinders were etched with 10% hydrofluoric acid for 60 s and received two layers of silane. Brackets were bonded to the cylinders using Transbond XT and assigned to 5 groups (n=5): Group 1 -Control group (without thermal cycling); Group 2 -500 thermal cycles; Group 3 -5,000 thermal cycles; Group 4 -7,000 thermal cycles and Group 5 -10,000 thermal cycles. Light-activation was carried out by Radii Plus LED. SBS testing was carried out after 24 h of storage in deionized water and thermal cycling (5/55 o C and 30 s dwell time). Five brackets were bonded to each cylinder, totalizing 25 brackets for each group. Data were submitted to one-way ANOVA and Tukey's test (α=0.05). The Adhesive Remnant Index (ARI) was evaluated at 8× magnification. The SBS (MPa) of control group (9.3±0.8), 500 (9.0±0.7) and 5,000 (8.4±0.9) thermal cycles were significantly higher than those after 7,000 (6.8±0.6) and 10,000 (4.9±1.0) thermal cycles (p<0.05). The ARI showed a predominance of Scores 0 (adhesive failure) prevailed in all groups, as shown by the ARI, with increased scores 1 and 2 (mixed failures) for control group and 500 thermal cycles. In conclusion, thermal fatigue may compromise the bonding integration between metallic brackets and ceramic restorations. For in vitro testing, use of at least 7,000 cycles is advised to result in significant fatigue on the bonding interface. I n f l u e n c e o f T h e r m a l C y c l e s N u m b e r o n B o n d S t r e n g t h o f M e t a l l i c B r a c ke t s t o C e r a m i c

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Section: Discussionmentioning

confidence: 99%

Influence of Thermal Cycles Number on Bond Strength of Metallic Brackets to Ceramic

et al. 2017

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“…In a study by Plant et al 8) , zinc phosphate cement exhibited 2.14°C temperature rise during setting, whereas polycarboxylate cement exhibited only 0.40°C increase in temperature. Ulusoy and Denli 22) found that with 1 volume increase in the liquid ratio, zinc phosphate cement exhibited the highest temperature increase at 4.54°C followed by polycarboxylate cement at 2.1°C.…”

Section: Discussionmentioning

confidence: 99%

“…Mixing the powder and liquid of a dental cement causes an exothermic reaction 6) . The temperature rise which occurs during the mixing of these materialsthenreachesthepulpchamberthroughthe dentinal tubules, thereby causing an increase in the pulpchambertemperature [7][8][9][10][11][12] . Langeland and Langeland 13) stated that as a result of temperature rise in teeth, coagulation of proteins in dentin will occur.…”

Section: Introductionmentioning

confidence: 99%

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An investigation of thermal changes of various permanent dental cements

2009

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Theaimofthisstudywastoinvestigateandcomparethetemperatureriseswhichoccurredduringthesettingreactionsof different permanent cements used to lute fixed partial prosthodontics.In this study, four cements were used. They were mixed in three different proportions: according to manufacturers' recommendations, at doubled powder ratio, and at doubled liquid ratio. With a thermocouple, the temperature rises which occurred during the setting reactions were measured. For each proportion, the measurement was repeated five times such that a total of 60 measurements were done for the four different cements. Data were analyzed using analysis of variance (ANOVA).ANOVA results showed that cement type and the interaction between cement type and the powder-liquid ratio were statistically significant factors (p<0.001). Similarly, the powder-liquid ratio was a statistically significant (p<0.01) factor.Among the dental cements tested, zinc phosphate cement showed the highest temperature rise during setting reaction, whereas glass ionomer cement showed the lowest.

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“…Besides its inherent exothermic reaction [9,[22][23][24] and volumetric shrinkage [23,[25][26][27], PMM have shown-among the literature-better physical properties [9,[27][28][29][30], color stability [27,31], and durability [9,27,32]. The present technique utilizes an indirect approach, were its fabrication takes place on the laboratory.…”

Section: Discussionmentioning

confidence: 99%

A Technique to Improve an Ailing Interim Implant-Supported Fixed Partial Denture

2015

J Oral Biol

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Objective: Implant-supported interim prostheses aims to preserve the natural periodontal architecture, protect the surrounding tissues, and provide patients with immediate esthetic and functional outcomes. The objective of this clinical technique article is to present a reliable method to replace an ailing interim implant-supported fixed partial denture (FPD). Clinical considerations:Patient presented with an ailing interim implant-supported fixed partial denture (FPD) replacing all lower anterior incisors. After case was clinically and radiographically evaluated, diagnostic casts were mounted. Once the interim FPD was retrieved, provisional abutments were dislodged and cleaned. Implant impression copings were carried out intraorally using pattern resin; its respective implant replicas were attached and screwed. Healing abutments were hand-screwed to keep the periimplant tissue architecture until the delivering of the newly fabricated interim FPD. The implant impression copings and its respective implant replicas were positioned on the diagnostic cast using dental stone. The two provisional abutments were positioned on the implant replicas and screwed in place for the relining of the new interim prosthesis previously made with acrylic resin. The new interim FPD was finished, polished and delivered. Conclusion:This clinical technique presents a reliable method for fabricating an immediate interim implant-supported FPD to replace an existing ailing interim prosthesis.assess proposed occlusal schemes before definitive restoration is placed [9].Provisional restorations designs appertain to implant therapy range from the removable acrylic resin complete denture to implantsupported fixed prosthesis [4][5][6][7][8]10,[14][15][16][17][18][19][20].The multiple clinical challenges (e.g. complex biomechanics, time management and periimplant tissue' architecture), dictates the type of material required. Generally, the aforementioned techniques are modeled by anecdotal and observational information, and are conveyed from natural tooth provisional techniques.Contemporary materials for interim prostheses include polymethyl methacrylate (PMM), polyethyl methacrylate, polyvinyl ethyl methacrylate, bis-acryl composite resin, and visible lightpolymerized urethane dimethacrylate [21]. Besides its inherent exothermic reaction [9,[22][23][24] and volumetric shrinkage [23,[25][26][27], PMM have shown-among the literature-better physical properties [9,[27][28][29][30], color stability [27,31], and durability [9,27,32]. The present technique utilizes an indirect approach, were its fabrication takes place on the laboratory. The indirect technique eliminates the problems associated with the direct technique such as less accuracy on the margins, more chemical and thermal irritants around the tissues and more chances to locked the interim prostheses due to surrounding undercuts [28,29].By utilizing the indirect technique with PMM in implant dentistry, our expected clinical outcomes have more chances to be colored by the "tincture of...

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The heat evolved and temperatures attained during setting of restorative materials

Cited by 76 publications

References 0 publications

Influence of Thermal Cycles Number on Bond Strength of Metallic Brackets to Ceramic

Influence of Thermal Cycles Number on Bond Strength of Metallic Brackets to Ceramic

An investigation of thermal changes of various permanent dental cements

A Technique to Improve an Ailing Interim Implant-Supported Fixed Partial Denture

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