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Guarneri JAG, Chima MVA, Assis DG, Rueggeberg FA, Arrais CAG. Influence of light exposure techniques on in vitro pulp temperature rise during bulk fill composite Class I restorations. Odontology 2024; 112:479-488. [PMID: 37938400 DOI: 10.1007/s10266-023-00867-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Accepted: 10/16/2023] [Indexed: 11/09/2023]
Abstract
This in vitro study assessed peak temperature and temperature increase (ΔT) within the pulp chamber during different extended photoactivation techniques (EPT-applying similar radiant exposure values) to resin-based composites (RBCs) placed in a Class I cavity preparation in an extracted human lower third molar. A T-type thermocouple was placed in the pulp chamber and connected to a temperature analysis device (Thermes, Physitemp). The tooth was attached to an assembly simulating the in vivo environment (controlled baseline pulp chamber temperature and fluid flow). The real-time pulp chamber temperature was evaluated throughout the photoactivation (Bluephase N, Ivoclar Vivadent) of two bulk-fill RBCs: Tetric N Ceram Bulk Fill (TBF; shade: IVA; Ivoclar Vivadent); Surefill SDR flow + (SDR, shade: Universal; Dentsply Sirona), which were exposed to different curing techniques: 40 s-occlusal surface; 20 s-occlusal + 10 s-buccal + 10 s-lingual surfaces; 10 s-buccal + 10 s + lingual + 20 s-occlusal surfaces. Each EPT delivered 42.4 J/cm2. Vickers hardness (VHN) was measured on the removed, sectioned RBC restorations at the top and bottom middle areas after curing. ΔT and VHN data were analyzed using 2-way ANOVA followed by Bonferroni post-hoc test (α = 0.05). Peak temperature data were analyzed using one-way ANOVA and Dunnett's post-hoc test (α = 0.05). SDR showed higher ΔT values than TBF (p = 0.008) in some EPTs. Neither technique resulted in ΔT values greater than 5.5 °C. Both composites had acceptable bottom/top hardness ratios (greater than 80%), regardless of the photoactivation technique. The evaluated EPTs may be considered safe as a low-temperature increase was noticed within the pulp chamber.
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Affiliation(s)
- Juliana Anany Gonzales Guarneri
- Department of Restorative Dentistry, State University of Ponta Grossa, General Carlos Cavalcanti St., 4748, Uvaranas, Ponta Grossa, Parana, 84030-900, Brazil
| | - Maria Victoria Arteaga Chima
- Department of Restorative Dentistry, State University of Ponta Grossa, General Carlos Cavalcanti St., 4748, Uvaranas, Ponta Grossa, Parana, 84030-900, Brazil
| | - Danielle Gomes Assis
- Department of Restorative Dentistry, State University of Ponta Grossa, General Carlos Cavalcanti St., 4748, Uvaranas, Ponta Grossa, Parana, 84030-900, Brazil
| | - Frederick Allen Rueggeberg
- Dental Materials Section, Department of Restorative Sciences, Dental College of Georgia, Augusta University, Room GC 4344, 1430 John Wesley Gilbert Drive, Augusta, GA, 30912, USA
| | - Cesar Augusto Galvão Arrais
- Department of Restorative Dentistry, State University of Ponta Grossa, General Carlos Cavalcanti St., 4748, Uvaranas, Ponta Grossa, Parana, 84030-900, Brazil.
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Nakagawa RK, Araújo de Oliveira HH, Abreu LG, R DCA, Lf DSAM, A NM. Pulpal Temperature Variances During Step-by-step Adhesive Restorative Procedure Using Three Different High-irradiance Light-curing Units. Oper Dent 2024; 49:43-51. [PMID: 38180469 DOI: 10.2341/22-045-l] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/31/2023] [Indexed: 01/06/2024]
Abstract
The rise in temperature in pulp tissues is related not only to heat transfer by high-irradiance light-curing units (LCUs), but also to restorative procedures. This research aimed to compare the rise in pulp temperature (PT) induced by three LCUs at each restorative step while considering the influence of resin composite shade and thickness. To accomplish this, the investigators used a proposed experimental model replicating pulp fluid circulation with a controlled, simulated intraoral temperature in bovine incisors. The recorded external and internal PT ranged from 36.7°C to 37.1°C and 32.7°C to 33.0°C, respectively. A significant decrease of internal temperature was recorded during class V preparation, followed by a progressive and representative rise of temperature in the subsequent restorative steps. The temperature was significantly higher during light curing of the adhesive system using Valo compared to light curing using Elipar and Radii Cal. However, none of the analyzed devices produced a temperature that exceeded the pulp tolerance limit (a temperature increase over 5.5°C). The paired test showed no significant difference in pulp temperature associated with the thickness of the increment of resin composite. However, shade was found to have more influence on the amount of energy absorbed by pulp tissue-A1 samples showed significantly higher temperature variation compared to samples using the A4 shade of resin composite. To conclude, the microcirculation and the performance of procedures under constant air-water flux dissipate the heat absorbed by the pulp. Additionally, the data suggest that all three LCUs analyzed can be safely used in clinical procedures, and that the resin composite shade may influence the amount of irradiance delivered to the tooth surface and represents a significant factor in pulp temperature variance.
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Affiliation(s)
- R K Nakagawa
- Rodrigo Keigo Nakagawa, DDS, MSc, PhD, postdoctoral researcher, Department of Restorative Dentistry, Federal University of Minas Gerais, Bel o Horizonte, Brazil
| | - H H Araújo de Oliveira
- Hans Hatner Araújo de Oliveira, DDS, MSc student, Department of Restorative Dentistry, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | - L G Abreu
- Lucas Guimarães Abreu, DDs, MSc, PhD, professor, Department of Pediatric Dentistry, Universidade Federal de Minas Gerais
| | - de Castro Albuquerque R
- Rodrigo de Castro Albuquerque, DDS, MSc, PhD, professor, Department of Restorative Dentistry, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | - Dos Santos Alves Morgan Lf
- *Luís Fernando dos Santos Alves Morgan, DDS, MSc, PhD, professor, Department of Restorative Dentistry, Federal University of Minas Gerais
| | - Nogueira Moreira A
- Allyson Nogueira Moreira, DDS, MSc, PhD professor, Department of Restorative Dentistry, Federal University of Minas Gerais, Belo Horizonte, Brazil
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Najar MPT, Barbosa LHR, Carlos NR, França FMG, Turssi CP, Vieira-Junior WF, Basting RT. Continuous vs fractionated violet LED light protocols for dental bleaching: evaluations of color change and temperature of the dental pulp and buccal surface. Photodiagnosis Photodyn Ther 2023:103631. [PMID: 37236518 DOI: 10.1016/j.pdpdt.2023.103631] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 05/20/2023] [Accepted: 05/23/2023] [Indexed: 05/28/2023]
Abstract
BACKGROUND Dental color change and the temperature of the pulp chamber and of the buccal surface were evaluated during bleaching with 37% carbamide peroxide (CP) with continuous vs fractionated violet LED light protocols. METHODOLOGY Bovine incisors received in-office bleaching for 30 minutes using different light protocols (Bright Max Whitening, MMOptics). Teeth were separated into groups (n=10): HP) 35% hydrogen peroxide (Whiteness HP, FGM)/no light; CP) 37% carbamide peroxide (Whiteness SuperEndo, FGM)/no light; CP10) CP+10 min of continuous light; CP20) CP+20 min of continuous light; CP30) CP+30 min of continuous light; CPF) CP+20 cycles of 60 s light / 30 s no light (fractionated). Color evaluations were performed at different times. Evaluations of pulp and buccal surface temperatures were performed before and throughout the 30 minutes of bleaching. RESULTS Generalized linear models for repeated measures over time were applied to the data (α=5%). After the 1st session, CP20 and CP30 had significantly lower b* values than CP and CP10 (p=0.0071). For ΔEab and ΔE00, CPF, CP20 and CP30 showed the highest color change among the treatments after the third bleaching (p<0.05). For temperature evaluations, CP30 showed higher pulp and buccal surface temperatures than the other protocols (p<0.0001) after 20 min. CONCLUSION Fractionated or continuous application of violet LED for 20 or 30 min leads to greater effectiveness of color change. All protocols with the application of LED led to an increase in pulp and buccal surface temperatures during bleaching, although the fractionated application appeared to be safer than the use of continuous light.
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Affiliation(s)
| | - Luciana Hilel Rangel Barbosa
- Dental School São Leopoldo Mandic, Rua José Rocha Junqueira 13, Bairro Swift, Campinas, CEP: 13045-755, São Paulo, Brazil
| | - Natália Russo Carlos
- Dental School São Leopoldo Mandic, Rua José Rocha Junqueira 13, Bairro Swift, Campinas, CEP: 13045-755, São Paulo, Brazil
| | - Fabiana Mantovani Gomes França
- Dental School São Leopoldo Mandic, Rua José Rocha Junqueira 13, Bairro Swift, Campinas, CEP: 13045-755, São Paulo, Brazil
| | - Cecilia Pedroso Turssi
- Dental School São Leopoldo Mandic, Rua José Rocha Junqueira 13, Bairro Swift, Campinas, CEP: 13045-755, São Paulo, Brazil
| | | | - Roberta Tarkany Basting
- Dental School São Leopoldo Mandic, Rua José Rocha Junqueira 13, Bairro Swift, Campinas, CEP: 13045-755, São Paulo, Brazil.
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In vivo temperature rise and acute inflammatory response in anesthetized human pulp tissue of premolars having Class V preparations after exposure to Polywave® LED light curing units. Dent Mater 2020; 36:1201-1213. [DOI: 10.1016/j.dental.2020.05.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Revised: 05/20/2020] [Accepted: 05/25/2020] [Indexed: 11/20/2022]
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Chua H, Choi JJE, Ramani RS, Ganjigatti R, Waddell JN. The cooling efficiency of different dental high-speed handpiece coolant port designs. Heliyon 2019; 5:e02185. [PMID: 31485498 PMCID: PMC6717145 DOI: 10.1016/j.heliyon.2019.e02185] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Revised: 07/08/2019] [Accepted: 07/26/2019] [Indexed: 11/06/2022] Open
Abstract
The study investigated the cooling efficiency of different numbers of water coolant ports on high-speed handpieces (HSH) under cooling conditions used in clinical practice. Twenty-four groove cuts with water on and nine cuts without water were made on extracted human premolars using three HSHs with different port configurations. Thermocouples were placed in the pulp chambers and temperature changes were recorded with 1-, 3- and 4-coolant port handpieces. Cooling rate was calculated for each coolant port design system. Temperature changes were statistically analysed with Kruskal-Willis Test. All three sample groups resulted in a net temperature decrease during the cutting period with water turned on. There was a pattern of increased cooling rate with increasing number of coolant ports (1-port: -4.27 (±0.94) °C, 3-port: -4.66 (±2.90) °C, 4-port: -5.03 (±1.08) °C). The difference was not statistically significant (p = 0.681). Calculations of cooling rate showed a higher cooling rate with an increase in the number of ports (1-port: 46.13 × 10−4 K−1, 3-port: 51.36 × 10−4 K−1, 4-port: 56.32 × 10−4 K−1). In the dry tooth preparation samples, all resulted in a net increase in temperature (1-port: 4.43 (±3.30) °C, 3-port: 5.13 (±3.27) °C, 4-port: 2.87 (±2.97) °C). All the three water coolant port configurations showed effective cooling of the tooth during cutting and decreased pulpal temperature with no statistical difference. There are HSH designs with varying numbers of coolant ports available in the market for clinicians. The results of the current study could potentially aid clinicians in making a decision while choosing between different dental handpieces.
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Affiliation(s)
- Helene Chua
- Sir John Walsh Research Institute, Faculty of Dentistry, University of Otago, Dunedin, New Zealand
| | - Joanne Jung Eun Choi
- Sir John Walsh Research Institute, Faculty of Dentistry, University of Otago, Dunedin, New Zealand
| | - Rishi Sanjay Ramani
- Sir John Walsh Research Institute, Faculty of Dentistry, University of Otago, Dunedin, New Zealand
| | - Ritu Ganjigatti
- Sir John Walsh Research Institute, Faculty of Dentistry, University of Otago, Dunedin, New Zealand
| | - John Neil Waddell
- Sir John Walsh Research Institute, Faculty of Dentistry, University of Otago, Dunedin, New Zealand
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Runnacles P, Arrais CAG, Maucoski C, Coelho U, De Goes MF, Rueggeberg FA. Comparison of in vivo and in vitro models to evaluate pulp temperature rise during exposure to a Polywave® LED light curing unit. J Appl Oral Sci 2019; 27:e20180480. [PMID: 31116279 PMCID: PMC6534370 DOI: 10.1590/1678-7757-2018-0480] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Revised: 10/31/2018] [Accepted: 11/28/2018] [Indexed: 11/21/2022] Open
Abstract
OBJECTIVES To measure and compare in vivo and in vitro pulp temperature (PT) increase (ΔTEMP) over baseline, physiologic temperature using the same intact upper premolars exposed to the same Polywave® LED curing light. METHODOLOGY After local Ethics Committee approval (#255,945), local anesthesia, rubber dam isolation, small occlusal preparations/minute pulp exposure (n=15) were performed in teeth requiring extraction for orthodontic reasons. A sterile probe of a temperature measurement system (Temperature Data Acquisition, Physitemp) was placed within the pulp chamber and the buccal surface was sequentially exposed to a LED LCU (Bluephase 20i, Ivoclar Vivadent) using the following exposure modes: 10-s low or high, 5-s Turbo, and 60-s high. Afterwards, the teeth were extracted and K-type thermocouples were placed within the pulp chamber through the original access. The teeth were attached to an assembly simulating the in vivo environment, being similarly exposed while real-time temperature (°C) was recorded. ΔTEMP values and time for temperature to reach maximum (ΔTIME) were subjected to two-way ANOVA and Bonferroni's post-hoc tests (pre-set alpha 0.05). RESULTS Higher ΔTEMP was observed in vitro than in vivo. No significant difference in ΔTIME was observed between test conditions. A significant, positive relationship was observed between radiant exposure and ΔTEMP for both conditions (in vivo: r2=0.917; p<0.001; in vitro: r2=0.919; p<0.001). CONCLUSION Although the in vitro model overestimated in vivo PT increase, in vitro PT rise was close to in vivo values for clinically relevant exposure modes.
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Affiliation(s)
- Patricio Runnacles
- Universidade Estadual de Ponta Grossa, Departamento de Odontologia Restauradora, Ponta Grossa, Paraná, Brasil
| | - Cesar Augusto Galvão Arrais
- Universidade Estadual de Ponta Grossa, Departamento de Odontologia Restauradora, Ponta Grossa, Paraná, Brasil
| | - Cristiane Maucoski
- Universidade Estadual de Ponta Grossa, Departamento de Odontologia Restauradora, Ponta Grossa, Paraná, Brasil
| | - Ulisses Coelho
- Universidade Estadual de Ponta Grossa, Departamento de Odontologia Restauradora, Ponta Grossa, Paraná, Brasil
| | - Mario Fernando De Goes
- Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba, Departamento de Materiais Dentários, Piracicaba, São Paulo, Brasil
| | - Frederick Allen Rueggeberg
- Augusta University, Dental College of Georgia, Department of Restorative Sciences, Dental Materials Section, Augusta, Georgia, USA
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Zarpellon DC, Runnacles P, Maucoski C, Coelho U, Rueggeberg FA, Arrais CAG. Controlling In Vivo, Human Pulp Temperature Rise Caused by LED Curing Light Exposure. Oper Dent 2019; 44:235-241. [DOI: 10.2341/17-364-c] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
SUMMARY
Objective:
The objective of this study was to evaluate the in vivo effectiveness of air spray to reduce pulp temperature rise during exposure of intact premolars to light emitted by a high-power LED light-curing unit (LCU).
Methods and Materials:
After local Ethics Committee approval (#255945), intact, upper first premolars requiring extraction for orthodontic reasons from five volunteers received infiltrative and intraligamental anesthesia. The teeth (n=9) were isolated using rubber dam, and a minute pulp exposure was attained. The sterile probe from a wireless, NIST-traceable, temperature acquisition system was inserted directly into the coronal pulp chamber. Real-time pulp temperature (PT) (°C) was continuously monitored, while the buccal surface was exposed to a polywave LED LCU (Bluephase 20i, Ivoclar Vivadent) for 30 seconds with simultaneous application of a lingually directed air spray (30s-H/AIR) or without (30s-H), with a seven-minute span between each exposure. Peak PT values were subjected to one-way, repeated-measures analysis of variance, and PT change from baseline (ΔT) during exposure was subjected to paired Student's t-test (α=0.05).
Results:
Peak PT values of the 30s-H group were significantly higher than those of 30s-H/AIR group and those from baseline temperature (p<0.001), whereas peak PT values in the 30s-H/AIR group were significantly lower than the baseline temperature (p=0.003). The 30s-H/AIR group showed significantly lower ΔT values than did the 30s-H group (p<0.001).
Conclusion:
Applying air flow simultaneously with LED exposure prevents in vivo pulp temperature rise.
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Affiliation(s)
- DC Zarpellon
- Driellen Christine Zarpellon, DDS, MS, Department of Restorative Dentistry, State University of Ponta Grossa, Ponta Grossa, Brazil
| | - P Runnacles
- Patricio Runnacles, DDS, MS, PhD, Department of Restorative Dentistry, State University of Ponta Grossa, Ponta Grossa, Brazil
| | - C Maucoski
- Cristiane Maucoski, DDS, Department of Restorative Dentistry, State University of Ponta Grossa, Ponta Grossa, Brazil
| | - U Coelho
- Ulisses Coelho, DDS, MS, PhD, Department of Restorative Dentistry, State University of Ponta Grossa, Ponta Grossa, Brazil
| | - FA Rueggeberg
- Frederick Allen Rueggeberg, DDS, MS, Dental Materials Section, Department of Restorative Sciences, Dental College of Georgia, Augusta University, Augusta, GA, USA
| | - CAG Arrais
- Cesar Augusto Galvao Arrais, DDS, MS, PhD, Department of Restorative Dentistry, State University of Ponta Grossa, Ponta Grossa, Brazil
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Braga SSL, Oliveira LRS, Ribeiro MTH, Vilela ABF, da Silva GR, Price RB, Soares CJ. Effect of Simulated Pulpal Microcirculation on Temperature When Light Curing Bulk Fill Composites. Oper Dent 2019; 44:289-301. [DOI: 10.2341/17-351-l] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
SUMMARY
Objectives:
To evaluate the effect of light curing bulk fill resin composite restorations on the increase in the temperature of the pulp chamber both with and without a simulated pulpal fluid flow.
Methods and Materials:
Forty extracted human molars received a flat occlusal cavity, leaving approximately 2 mm of dentin over the pulp. The teeth were restored using a self-etch adhesive system (Clearfil SE Bond, Kuraray) and two different bulk fill resin composites: a flowable (SDR, Dentsply) and a regular paste (AURA, SDI) bulk fill. The adhesive was light cured for 20 seconds, SDR was light cured for 20 seconds, and AURA was light cured for 40 seconds using the Bluephase G2 (Ivoclar Vivadent) or the VALO Cordless (Ultradent) in the standard output power mode. The degree of conversion (DC) at the top and bottom of the bulk fill resin composite was assessed using Fourier-Transform Infra Red spectroscopy. The temperature in the pulp chamber when light curing the adhesive system and resin composite was measured using a J-type thermocouple both with and without the presence of a simulated microcirculation of 1.0-1.4 mL/min. Data were analyzed using Student t-tests and two-way and three-way analyses of variance (α=0.05 significance level).
Results:
The irradiance delivered by the light-curing units (LCUs) was greatest close to the top sensor of the MARC resin calibrator (BlueLight Analytics) and lowest after passing through the 4.0 mm of resin composite plus 2.0 mm of dentin. In general, the Bluephase G2 delivered a higher irradiance than did the VALO Cordless. The resin composite, LCU, and region all influenced the degree of cure. The simulated pulpal microcirculation significantly reduced the temperature increase. The greatest temperature rise occurred when the adhesive system was light cured. The Bluephase G2 produced a rise of 6°C, and the VALO Cordless produced a lower temperature change (4°C) when light curing the adhesive system for 20 seconds without pulpal microcirculation. Light curing SDR produced the greatest exothermic reaction.
Conclusions:
Using simulated pulpal microcirculation resulted in lower temperature increases. The flowable composite (SDR) allowed more light transmission and had a higher degree of conversion than did the regular paste (AURA). The greatest temperature rise occurred when light curing the adhesive system alone.
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Affiliation(s)
- SSL Braga
- Stella Sueli Lourenço Braga, DDS, MSc, PhD student, Department of Operative Dentistry and Dental Materials, School of Dentistry, Federal University of Uberlandia, Minas Gerais, Brazil
| | - LRS Oliveira
- Laís Rani Sales Oliveira, DDS, MSc, PhD student, Department of Operative Dentistry and Dental Materials, School of Dentistry, Federal University of Uberlandia, Minas Gerais, Brazil
| | - MTH Ribeiro
- Maria Tereza Hordones Ribeiro, undergraduate student, Department of Operative Dentistry and Dental Materials, School of Dentistry, Federal University of Uberlandia, Minas Gerais, Brazil
| | - ABF Vilela
- Andomar Bruno Fernandes Vilela, DDS, MSc, PhD student, Department of Operative Dentistry and Dental Materials, School of Dentistry, Federal University of Uberlandia, Minas Gerais, Brazil
| | - GR da Silva
- Gisele Rodrigues da Silva, DDS, MSc, PhD, professor, Department of Operative Dentistry and Dental Materials, School of Dentistry, Federal University of Uberlandia, Minas Gerais, Brazil
| | - RB Price
- Richard Bengt Price, DDS, MSc, PhD, professor, Department of Dental Clinical Sciences, Dalhousie University, Halifax, NS, Canada
| | - CJ Soares
- Carlos José Soares, DDS, MSc, PhD, professor and chair, Department of Operative Dentistry and Dental Materials, School of Dentistry, Federal University of Uberlandia, Minas Gerais, Brazil
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Germscheid W, de Gorre LG, Sullivan B, O’Neill C, Price RB, Labrie D. Post-curing in dental resin-based composites. Dent Mater 2018; 34:1367-1377. [DOI: 10.1016/j.dental.2018.06.021] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Revised: 06/06/2018] [Accepted: 06/07/2018] [Indexed: 11/16/2022]
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Zarpellon DC, Runnacles P, Maucoski C, Gross DJ, Coelho U, Rueggeberg FA, Arrais CAG. Influence of Class V preparation on in vivo temperature rise in anesthetized human pulp during exposure to a Polywave ® LED light curing unit. Dent Mater 2018; 34:901-909. [PMID: 29606368 DOI: 10.1016/j.dental.2018.03.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2017] [Revised: 03/07/2018] [Accepted: 03/12/2018] [Indexed: 11/29/2022]
Abstract
OBJECTIVE This in vivo study evaluated pulp temperature (PT) rise in human premolars having deep Class V preparations during exposure to a light curing unit (LCU) using selected exposure modes (EMs). METHODS After local Ethics Committee approval, intact first premolars (n=8) requiring extraction for orthodontic reasons, from 8 volunteers, received infiltrative and intraligamental anesthesia and were isolated using rubber dam. A minute pulp exposure was attained and sterile probe from a wireless, NIST-traceable, temperature acquisition system was inserted into the coronal pulp chamber to continuously monitor PT (°C). A deep buccal Class V preparation was prepared using a high speed diamond bur under air-water spray cooling. The surface was exposed to a Polywave® LED LCU (Bluephase 20i, Ivoclar Vivadent) using selected EMs, allowing 7-min span between each exposure: 10-s in low (10-s/L), 10-s (10-s/H), 30-s (30-s/H), or 60-s (60-s/H) in high mode; and 5-s-Turbo (5-s/T). Peak PT values and PT increases over physiologic baseline levels (ΔT) were subjected to 1-way, repeated measures ANOVAs, and Bonferroni's post-hoc tests (α=0.05). Linear regression analysis was performed to establish the relationship between applied radiant exposure and ΔT. RESULTS All EMs produced higher peak PT than the baseline temperature (p<0.001). Only 60-s/H mode generated an average ΔT of 5.5°C (p<0.001). A significant, positive relationship was noted between applied radiant exposure and ΔT (r2=0.8962; p<0.001). SIGNIFICANCE In vivo exposure of deep Class V preparation to Polywave® LED LCU increases PT to values considered safe for the pulp, for most EMs. Only the longest evaluated EM caused higher PT increase than the critical ΔT, thought to be associated with pulpal necrosis.
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Affiliation(s)
- Driellen Christine Zarpellon
- Department of Restorative Dentistry, State University of Ponta Grossa, Rua General Carlos Cavalcanti, 4748, Uvaranas 84030-900, Ponta Grossa, Parana, Brazil
| | - Patrício Runnacles
- Department of Restorative Dentistry, State University of Ponta Grossa, Rua General Carlos Cavalcanti, 4748, Uvaranas 84030-900, Ponta Grossa, Parana, Brazil
| | - Cristiane Maucoski
- Department of Restorative Dentistry, State University of Ponta Grossa, Rua General Carlos Cavalcanti, 4748, Uvaranas 84030-900, Ponta Grossa, Parana, Brazil
| | - Dayane Jaqueline Gross
- Department of Restorative Dentistry, State University of Ponta Grossa, Rua General Carlos Cavalcanti, 4748, Uvaranas 84030-900, Ponta Grossa, Parana, Brazil
| | - Ulisses Coelho
- Department of Restorative Dentistry, State University of Ponta Grossa, Rua General Carlos Cavalcanti, 4748, Uvaranas 84030-900, Ponta Grossa, Parana, Brazil
| | - Frederick Allen Rueggeberg
- Dental Materials Section, Department of Restorative Sciences, Dental College of Georgia, Room GC 4344, Augusta University, 1430 John Wesley Gilbert Drive, Augusta, GA 30912, USA
| | - Cesar Augusto Galvão Arrais
- Department of Restorative Dentistry, State University of Ponta Grossa, Rua General Carlos Cavalcanti, 4748, Uvaranas 84030-900, Ponta Grossa, Parana, Brazil.
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11
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Analysis of temperature increase in swine gingiva after exposure to a Polywave ® LED light curing unit. Dent Mater 2017; 33:1266-1273. [DOI: 10.1016/j.dental.2017.07.021] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Revised: 06/17/2017] [Accepted: 07/27/2017] [Indexed: 11/18/2022]
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12
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Runnacles P, Arrais CAG, Pochapski MT, dos Santos FA, Coelho U, Gomes JC, De Goes MF, Gomes OMM, Rueggeberg FA. In vivo temperature rise in anesthetized human pulp during exposure to a polywave LED light curing unit. Dent Mater 2015; 31:505-13. [DOI: 10.1016/j.dental.2015.02.001] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Revised: 01/08/2015] [Accepted: 02/02/2015] [Indexed: 11/26/2022]
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