Objective: The aim of this study was to examine the temperature changes in the pulp chamber during cavity preparation with the Er:YAG laser (2940 nm) with a very short pulse (VSP).
Materials And Methods: Nine groups of 10 intact molars each were used. One root of each sample was amputated and a thermocouple was inserted into the chamber. Class V cavity preparation in enamel was performed, and then preparation was performed in dentine. The enamel was lased with 400, 360, and 320 mJ in contact mode using a VSP with a duration of 100 microsec. The diameter of the fiber tip was 950 microm. Frequencies of 10, 12, and 15 Hz were used, and the total time of irradiation was 10 sec. The dentine was irradiated with 340, 280, and 200 mJ at 10, 8, and 5 Hz for 7 sec. Cooling was done with a water spray (73 psi and 50 mL/min). The differences were tested by MANOVA and the Bonferroni post hoc test.
Results: The highest rise in temperature in the pulp was achieved after enamel irradiation with 400 mJ and 15 Hz (1.99 +/- 0.28 degrees C), and the lowest was after irradiation with 320 mJ and 10 Hz (0.70 +/- 0.18 degrees C). In dentine the highest temperature increase was achieved with 340 mJ and 10 Hz (1.37 +/- 0.42 degrees C), and the lowest was with 200 mJ and 5 Hz (0.43 +/- 0.18 degrees C). Two-way analysis of both enamel and dentine showed that the influence of energy on temperature increase was stronger than that of frequency.
Conclusion: Cavity preparation with an Er:YAG laser using VSP mode in vitro did not cause significant increases in temperature in the pulp chamber of human molars.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1089/pho.2008.2247 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Influence of chlorhexidine dentin disinfection on universal adhesive performance: Interfacial adaptation and bond strength assessments.
PLoS One
December 2024
Departement of Restorative Dentistry, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia.
Purpose: This study aimed to investigate the effect of chlorhexidine (CHX) cavity disinfectant on interfacial microleakage and micro-tensile bond strength (μTBS) of a universal adhesive bonded to dentin in both self-etch (SE) and etch-and-rinse (ER) modes.
Methods: Class I cavities were prepared in the coronal dentin of extracted human teeth and assigned to two etching modes (SE or ER), then subdivided by disinfection with or without CHX (n = 5). Cavities were restored using Single Bond Universal Adhesive and Filtek Z350 XT composite.
Prospective, randomized clinical trial evaluating the clinical performance of a new universal adhesive in Class I and Class II restorations at 1 year.
Clin Oral Investig
December 2024
Department of Primary Dental Care, University of Minnesota School of Dentistry, Minneapolis, MN, 55455, USA.
Objective: This randomized controlled trial compared the 1-year clinical efficacy of Scotchbond Universal Adhesive Plus (SBU+) with that of its predecessor Scotchbond Universal Adhesive (SBU) to restore Class I and Class II preparations using the self-etch strategy in adult patients.
Materials And Methods: Fifty-one subjects participated in this study. Two posterior teeth in each subject were randomized to a restoration with SBU+ or to a restoration with SBU (control) using the self-etch strategy.
The effect of silver and calcium fluoride nanoparticles on antibacterial activity of composite resin against : An study.
Dent Res J (Isfahan)
November 2024
Department of Pediatric Dentistry, School of Dentistry, Ardabil University of Medical Sciences, Ardabil, Iran.
Background: Recurrent caries were attributed to the lack of antibacterial properties of the dental materials. Silver nanoparticles (AgNPs) and calcium fluoride nanoparticles (CaF2NPs) are broad-spectrum antibacterial agents. The object of the study was to investigate the antibacterial properties of composite-incorporated AgNPs and CaF2NPs on .
View Article and Find Full Text PDFBiological and chemical properties of new multi-functional root canal irrigants.
J Dent
December 2024
Dental College of Georgia, Augusta University, Augusta, GA, USA. Electronic address:
Objectives: To evaluate the efficacy of multi-functional root canal irrigating solutions in the removal of canal wall smear layers, antibacterial activity, cytotoxicity, and tissue dissolution efficacy.
Methods: Forty single-rooted teeth were mechanically instrumented and irrigated with Triton, EndoJuice™, EDTA, and 0.9% saline.
Step Cyclization to Give Part Belt Oxygen-Functionalized Pillar[6,10]arenes.
Org Lett
December 2024
Heilongjiang Provincial Key Laboratory of Surface Active Agent and Auxiliary, Technology Innovation Center of Industrial Hemp for State Market Regulation, Institute of Chemistry and Chemical Engineering, Qiqihar University, Qiqihar 161006, P. R. China.
Part belt oxygen-functionalized pillar[6,10]arenes are synthesized by step cyclization. An oxygen-substituted tetramer and hexamer have been prepared to construct the O3 pillar[6]arene via a hexamer cyclization reaction and the O6 pillar[10]arene through a [4 + 1+4 + 1] cyclization reaction. X-ray crystallographic studies reveal that both macrocycles have a large cavity and indicate that the part belt oxygen-functionalized pillar[6,10]arenes have both similar cyclic structures and certain differences in configuration compared to pillararene.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!