Temperature change in pulp chamber of primary teeth during curing of coloured compomers: an in vitro study using pulpal blood microcirculation model

Introduction An increase in the temperature of the pulp chamber occurs during polymerisation of all types of light-curing resin-containing restorative materials, due to both the exothermic reaction of the material and the energy absorbed during the curing process. Increase in temperature of the pulp chamber of primary teeth during the curing process or the thermal conductivity properties of coloured compomers (CCs) have not yet been investigated in detail. The aim of the present study was to investigate the increase in pulpal temperature in primary teeth during curing of CCs. Materials and Methods A Class-II cavity was prepared on the extracted primary mandibular second molar. Pulpal microcirculation of the tooth was performed using an experimental mechanism. The study included 15 groups and 10 experiments in each. Seven different CCs: pink, blue, gold, silver, orange, lemon, green, respectively from two different manufacturers (Groups 1–7: Twinky Star; VOCO, Cuxhaven, Germany. Groups 8–14: Nova Rainbow; IMICRYL, Konya, Turkey.) and a tooth-CC (Group 15: Dyract XP; DENTSPLY, Weybridge, UK.) were applied in prepared cavity. In all groups the compomers were light cured for 40 s. Intrapulpal temperature changes (Δt) in 20th and 40th second were recorded. In Group-15 the Δt values in 10th second were also recorded as per the manufacturer’s instructions. The Kruskal–Wallis test and the Mann–Whitney-U test were used for statistical analyses. Results At the end of 40-s irradiation time, the orange, lemon and green colours of Nova Rainbow resulted in significantly lower Δt values than the same colours of Twinky Star (p = 0.0001), and silver, blue, lemon, green, orange, and pink CCs of Nova Rainbow and the blue and silver shades of Twinky Star demonstrated lower Δt values than the reported critical temperature increase (5.5 °C). Conclusion An increase in the irradiation time consequently led to an increase in the intrapulpal temperature. Therefore, manufacturers should focus on production of new CCs with shorter polimerization time.

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Pulp Chamber Heating: An In Vitro Study Evaluating Different Light Sources and Resin Composite Layers

Brazilian Dental Journal ◽

10.1590/0103-6440201600328 ◽

2016 ◽

Vol 27 (6) ◽

pp. 675-680 ◽

Cited By ~ 7

Author(s):

Lígia Maria Lima Andreatta ◽

Adilson Yoshio Furuse ◽

Anuradha Prakki ◽

Juliana Fraga Soares Bombonatti ◽

Rafael Francisco Lia Mondelli

Keyword(s):

Light Source ◽

Irradiation Time ◽

Resin Composite ◽

In Vitro Study ◽

High Irradiance ◽

Light Sources ◽

Light Activation ◽

Pulp Chamber ◽

Composite Layers

Abstract The aim of the present in vitro study was to evaluate the temperature variation inside the pulp chamber during light-activation of the adhesive and resin composite layers with different light sources. Cavities measuring 8x10 mm were prepared on the buccal surface of bovine incisors, leaving a remaining dentin thickness of 1 mm. Specimens were placed in a 37±1 °C water bath to standardize the temperature. The temperature in the pulp chamber was measured every 10 s during 40 s of light activation of the adhesive system (SBMP-3M/ESPE) and in the three consecutive 1-mm-thick layers of resin composite (Z250-3M/ESPE). Three light source devices were evaluated: Elipar 2500 (QTH), LD Max (LED low irradiance) and VALO (LED high irradiance). The results were submitted to one-way ANOVA with repeated measures and Tukey's test, both with p<0.001. The exothermic reaction warming was observed in the Z250 increments, but not in the SBMP. The high irradiance LED showed a higher temperature average (42.7±1.56 °C), followed by the quartz-tungsten-halogen light (40.6±0.67 °C) and the lower irradiance LED (37.8±0.12 °C). Higher temperature increases were observed with the adhesive and the first resin composite increment light-activation, regardless of the employed light source. From the second increment of Z250, the restorative material acted as a dispersive structure of heat, reducing temperature increases. Regardless the light source and restorative step, the temperature increased with the irradiation time. It may be concluded that the light source, irradiation time and resin composite thickness interfered in the temperature variation inside the pulp chamber.

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Cariogenic Potential of Pediatric Liquid Medicaments- An in vitro Study

Journal of Clinical Pediatric Dentistry ◽

10.17796/jcpd.36.4.n404t58110t18082 ◽

2012 ◽

Vol 36 (4) ◽

pp. 363-367 ◽

Cited By ~ 4

Author(s):

DM Dalpian ◽

L Casagrande ◽

R Franzon ◽

GMC Dutra ◽

FB Araujo

Keyword(s):

Primary Teeth ◽

Composite Resin ◽

In Vitro Study ◽

Pulp Chamber ◽

Pulp Capping ◽

Caries Removal ◽

Indirect Pulp Capping ◽

Carious Teeth ◽

Partial Caries Removal

Aim: To evaluate the dentin microhardness of primary teeth undergoing indirect pulp capping (IPC) after partial caries removal. Materials: Primary molars were treated with IPC, restored with self-etching primer (Clearfil SE Bond; CSE), and filled with composite resin (Filtek Z250) with (n = 10) or without (n = 7) a calcium hydroxide base liner (Dycal; Dy). After tooth exfoliation, the microhardness of the demineralized dentin remaining under the restoration (n = 17) was analyzed and compared with that of sound and carious primary dentin (n = 20). Microhardness measurements were obtained from the deepest portion of the cavity until the roof of the pulp chamber. Data were analyzed by Kruskal-Wallis test (p < 0.05). Results: There was no difference in microhardness values at all depths between the treated groups (DY and CSE), but when the exfoliated carious teeth were included, the CSE had significantly higher values at 35-?m depth. This difference was only detected in the DY group after a depth of 200 µm. At 700 ?m, there was no difference in microhardness values between all 4 groups. Conclusions: Primary teeth that underwent IPC showed the same microhardness, regardless of the capping material used.

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MARGINAL LEAKAGE EVALUATION OF GIOMER AND COMPOMER IN PRIMARY TEETH (IN-VITRO STUDY)

Alexandria Dental Journal ◽

10.21608/adjalexu.2016.59278 ◽

2016 ◽

Vol 41 (2) ◽

pp. 188-193 ◽

Cited By ~ 1

Author(s):

Eldesouky Heba I. ◽

Hanno Azza G. ◽

Bakry Niveen S. ◽

Ahmed Dawlat M.

Keyword(s):

Primary Teeth ◽

In Vitro Study ◽

Vitro Study

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Effect of Cavity Disinfectants on Adhesion to Primary Teeth—A Systematic Review

International Journal of Molecular Sciences ◽

10.3390/ijms22094398 ◽

2021 ◽

Vol 22 (9) ◽

pp. 4398

Author(s):

Ana Coelho ◽

Inês Amaro ◽

Ana Apolónio ◽

Anabela Paula ◽

José Saraiva ◽

...

Keyword(s):

Primary Teeth ◽

Clinical Success ◽

Dental Materials ◽

In Vitro Study ◽

In Vitro Studies ◽

Cochrane Library ◽

Promising Alternative

Some authors have been proposing the use of cavity disinfectants in order to reduce, or even eliminate, the effect of the microorganisms present in a dental cavity before a restoration is placed. The aim of this study was to evaluate the effect of different cavity disinfectants on bond strength and clinical success of composite and glass ionomer restorations on primary teeth. The research was conducted using Cochrane Library, PubMed/MEDLINE, SCOPUS, and Web of Science for articles published up to February 2021. The search was performed according to the PICO strategy. The evaluation of the methodological quality of each in vitro study was assessed using the CONSORT checklist for reporting in vitro studies on dental materials. Sixteen in vitro studies and one in situ study fulfilled the inclusion criteria and were analyzed. Chlorhexidine was the most studied cavity disinfectant, and its use does not compromise dentin bonding. Sodium hypochlorite is a promising alternative, but more research on its use is required to clearly state that it can safely be used as a cavity disinfectant for primary teeth. Although other disinfectants were studied, there is a low-level evidence attesting their effects on adhesion, therefore their use should be avoided.

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