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Lasers in Medical Science Dec 2023Reducing treatment time is one of the most important trends in modern dentistry. This study aimed to compare the micro-leakage around the resin sealants when using both...
Reducing treatment time is one of the most important trends in modern dentistry. This study aimed to compare the micro-leakage around the resin sealants when using both high and conventional intensity light-curing systems. The study sample consisted of 30 extracted human maxillary premolar teeth that were divided into two equal groups according to the light-curing system used: Group 1, High-Intensity Light-Curing System and Group 2, Conventional Light-Curing System. Light-curing by Woodpecker I-LED device with two intensities (high and conventional) has been used. All teeth were subjected to 500 cycles of thermocycling. Then, a methylene blue dye microleakage test was performed, and the teeth were sectioned longitudinally and studied under a stereo microscope. The mean of micro-leakage in the high-intensity group (1.33 ± 1.29) was less than in the conventional intensity group (1.63 ± 1.29) without any statistically significant differences (p = 0.320). The high-intensity light-curing system mode may be a good and acceptable alternative to conventional intensity light-curing system mode in polymerization of pits and fissure sealants.
Topics: Humans; Composite Resins; Pit and Fissure Sealants; Curing Lights, Dental; Light-Curing of Dental Adhesives; Bicuspid; Dental Leakage
PubMed: 38159193
DOI: 10.1007/s10103-023-03963-3 -
Journal of International Society of... 2023To compare and evaluate the effectiveness of three commercially available desensitizing mouthwashes on dentinal tubule occlusion using a scanning electron microscope...
AIM
To compare and evaluate the effectiveness of three commercially available desensitizing mouthwashes on dentinal tubule occlusion using a scanning electron microscope (SEM).
MATERIALS AND METHODS
Twenty-seven premolar maxillary teeth were collected and cleaned to remove debris and tissue using an ultrasonic scaler. Enamel was removed with the help of a high-speed plain cut tungsten carbide fissure bur under continuous water spray. Dentinal discs measuring 5 mm × 5 mm × 3 mm were prepared from the coronal region of the extracted teeth using a double-sided carborundum disc and straight micromotor handpiece. Using carborundum paper, the discs were polished and washed with distilled water. The discs were etched using 37% phosphoric acid to remove any smear layer that was caused by the grinding process and to simulate dentinal hypersensitivity by opening the dentinal tubules. The specimens were again washed and stored in distilled water until use. Samples were then randomly allocated into Group A: calcium sodium phosphosilicate mouthwash, Group B: potassium nitrate mouthwash, and Group C: dipotassium oxalate monohydrate mouthwash. The specimens were immersed in a test tube filled with the respective mouthwash and vigorously shaken for 60 s for simulating the natural mouth rinsing action. This procedure was repeated for 7 days, twice daily. To compare and assess the proportion of dentinal tubule occlusion, all the samples were processed and examined under an SEM.
RESULTS
The efficacy of the mouthwash on the obliteration of dentinal tubules was compared using the Kruskal-Walis analysis of variance test followed by the Mann-Whitney test for pairwise comparison. Group A showed completely occluded tubules in 5 (55.6) and mostly occluded tubules in 4 (44.4). Group B showed mostly occluded in 4 samples (44.4) and partially occluded in 5 samples (55.6) and Group C showed completely occluded tubules in 3 samples (33.3) and mostly occluded tubules in 6 samples (66.7). A value of 0.05 or less is regarded as statistically significant. * ≤ 0.05 is statistically significant. Between Group A and Group B as well as between Group B and Group C, there was a statistically significant difference. However, a statistically significant difference between Group A and Group C does not exist.
CONCLUSION
The calcium sodium phosphosilicate group was shown to have the most occlusion of the dentinal tubule, followed by dipotassium oxalate monohydrate and potassium nitrate group.
PubMed: 38124731
DOI: 10.4103/jispcd.JISPCD_97_23 -
Quintessence International (Berlin,... Feb 2024To evaluate the effect of sonic oscillation on penetration depth and marginal adaptation of resin-based fissure sealants. (Randomized Controlled Trial)
Randomized Controlled Trial
OBJECTIVES
To evaluate the effect of sonic oscillation on penetration depth and marginal adaptation of resin-based fissure sealants.
METHOD AND MATERIALS
Thirty-six extracted human third molars were randomized into three groups: in the HF group, teeth were sealed with a filled-resin-based sealant (Helioseal F); in the Sonic-HF group, teeth were sealed with Helioseal F and subjected to sonic oscillation (Compothixo Device, 140 Hz vibration frequency and ± 150 µm amplitude) before curing; in the CO group, teeth were sealed with an unfilled-resin-based sealant (Clinpro). All teeth were thermocycled for 1,500 cycles at 5°C and 55°C, then sectioned buccolingually into four sections (mesial, two middle, and distal). Sections were evaluated under SEM for marginal adaptation and scored. For penetration depth, three independent measurements from each tooth were recorded under SEM, and data were subjected to statistical analysis.
RESULTS
The group subjected to sonic oscillation (Sonic HF) resulted in significantly superior penetration depth and marginal adaptation compared with the HF group, but with no significant difference compared with the CO group.
CONCLUSIONS
Sonic activation of resin-based sealant increased penetration depth into fissures and marginal adaptation to the enamel wall without decreasing filler load or compromising sealant mechanical properties.
Topics: Humans; Dental Enamel; Molar, Third; Pit and Fissure Sealants
PubMed: 38108418
DOI: 10.3290/j.qi.b4780253 -
Dental Materials Journal Jan 2024This study aimed to apply finite element analysis to evaluate the effects of pile materials with different elastic moduli and cement materials on the stress distribution...
Influence of restorative materials on the mechanical properties of maxillary first molars with different degrees of cryptic fractures and defects: A finite element analysis.
This study aimed to apply finite element analysis to evaluate the effects of pile materials with different elastic moduli and cement materials on the stress distribution between the remaining tooth tissue and cryptic fracture defects. A three-dimensional finite element model was established for 20 maxillary first molars with hidden fissures and mesial tongue-tip defects. Two levels of hidden cracks and three types of pile and adhesive materials were used in the design. The stress distribution and maximum stress peak in the remaining tooth tissue and crack defects were determined by simulating the normal bite, maximum bite, and lateral movement forces. When titanium posts, zinc phosphate binders, and porcelain crowns were used to repair the two types of deep cracked teeth, the maximum principal stress at the crack and dentin was the smallest. As the crack depth increased, the maximum principal stress of the residual dentin and crack defects increased.
Topics: Crowns; Finite Element Analysis; Post and Core Technique; Dental Materials; Molar; Stress, Mechanical; Dental Stress Analysis; Dentin
PubMed: 38104999
DOI: 10.4012/dmj.2023-151 -
American Journal of Dentistry Dec 2023To evaluate the wear of different materials used for pit and fissure sealing applied with non-invasive and invasive preparation techniques.
PURPOSE
To evaluate the wear of different materials used for pit and fissure sealing applied with non-invasive and invasive preparation techniques.
METHODS
A total of 170 molar teeth were divided into two main preparation groups (non-invasive and invasive), each consisting of eight subgroups after a control group was separated for wear standardization. Eight subgroups included: nano-filled flowable composite (Filtek Ultimate Flow), nanohybrid flowable composite (GrandioSo Flow), micro-hybrid flowable composite (Majesty Flow), resin-based unfilled fissure sealant (ClinPro Sealant), resin-based filled fissure sealant (Fissurit FX), resin-based highly filled fissure sealant (GrandioSeal), giomer-based fissure sealant (BeautiSealant), and glass-ionomer-based fissure sealant (Fuji Triage) (n= 10). The materials were applied according to the manufacturers' instructions. The initial data were obtained for wear analysis. The specimens were subjected to 2-year thermocycling and brushing simulations. Final data were obtained, and the wear characteristics were evaluated digitally. Data were statistically analyzed (P< 0.05).
RESULTS
There were no significant differences in wear between the non-invasive and invasive application groups (P< 0.05). In comparison of the materials, flowable composites presented the lowest wear (0.15 P± 0.13), and glass-ionomer-based fissure sealant presented the highest wear (0.66 P± 0.32).
CLINICAL SIGNIFICANCE
The present study reported that the invasive preparation technique, which slightly abrades the enamel surfaces, did not adversely affect the wear of the sealant materials. Although the application of flowable composites as fissure sealants with a bonding agent is time-consuming and costly, it yielded better results in terms of wear.
Topics: Humans; Dental Caries; Pit and Fissure Sealants; Molar; Acrylic Resins
PubMed: 38092746
DOI: No ID Found -
The Review of Scientific Instruments Aug 2023Excessive or persistent infection is a major contributing factor in impeding chronic wound healing. Wound bed preparations using antiseptics do not necessarily target...
Excessive or persistent infection is a major contributing factor in impeding chronic wound healing. Wound bed preparations using antiseptics do not necessarily target the entire bacterial spectrum, and the highly proliferating granulation tissue may be sensitive to the cytotoxic effects, impairing tissue repair. Non-thermal gas atmospheric pressure plasmas are partially ionized gases that contain highly reactive particles while the gas phase remains near room temperature, thus having the capability of accessing small irregular cavities and fissures and killing bacteria because of the diffusive nature of gas phase plasma species that are chemically reactive, providing an ideal approach to topical wound disinfection. A non-thermal plasma brush device of novel design has been developed that is suitable for clinical application in the disinfection of oral and wound bacteria. In vivo studies have indicated that the plasma brush treatment rendered no harmful effect on healthy skin or tissues, while it could improve wound healing in Pseudomonas aeruginosa biofilm infected wounds exposed to an optimized treatment with argon plus 1% nitrogen (Ar + N2) plasma.
Topics: Plasma Gases; Wound Healing; Skin; Bacteria; Nitrogen
PubMed: 38065141
DOI: 10.1063/5.0096969 -
Operative Dentistry Jan 2024The aim was to compare intrapulp temperature (IPT) changes when flat-fissure diamond burs and pear-shaped tungsten carbide burs were used to cut tooth structure,...
OBJECTIVE
The aim was to compare intrapulp temperature (IPT) changes when flat-fissure diamond burs and pear-shaped tungsten carbide burs were used to cut tooth structure, amalgam, and composite resin with and without water coolant.
METHODS
Thermocouples were inserted into the pulp chamber of extracted intact mandibular molars. The thermocouples were connected to an electronic thermometer that detects temperature every second to an accuracy of 0.1°C. IPT changes were recorded while using a high-speed handpiece during MOD cavity preparations (n=40), composite resin removal (n=40), and amalgam removal (n=40). A two-way ANOVA was used for each procedure to test for the effect of bur (pear-shaped tungsten carbide vs flat-fissured diamond) and water coolant (on vs off), with significant main effects (α=0.05) further analyzed using Tukey's multiple comparison test.
RESULTS
During MOD cavity preparation, water coolant reduced changes in IPT (0.03±0.27°C) compared to no water coolant (1.27±0.29°C) when tungsten carbide burs were used (p<0.05) but not when diamond burs were used. During composite resin removal, tungsten carbide burs had less changes in IPT (0.55±0.18°C) compared to diamond burs (1.66±0.50°C) with no water coolant (p<0.05). Water coolant also reduced changes in IPT (0.09±0.14°C) compared to no water coolant (1.66±0.50°C) when diamond burs were used (p<0.01). Water coolant did not significantly affect IPT when tungsten carbide burs were used. During amalgam removal, tungsten carbide burs had lower changes in IPT (0.56±0.15°C) compared to diamond burs (1.88±0.43°C) with no water coolant (p<0.05). Water coolant also significantly reduced changes in IPT (0.71±0.2°C) compared to no water coolant (1.88±0.43°C) when diamond burs were used (p<0.05) but not when tungsten carbide burs were used.
CONCLUSIONS
Water coolant reduced IPT changes when drilling tooth structure with tungsten carbide burs, but not when removing amalgam or composite. Conversely, water coolant reduced IPT changes when drilling with flat fissure diamond burs to remove amalgam and composite, but not when removing tooth structure. When amalgam and composite were removed without water coolant, the tungsten carbide burs resulted in lower IPT changes than when flat fissure diamond burs were used in the same way.
Topics: Temperature; Water; Dental High-Speed Equipment; Composite Resins; Tungsten Compounds; Diamond; Surface Properties
PubMed: 38057997
DOI: 10.2341/23-033-L -
Oral Health & Preventive Dentistry Dec 2023To compare the long-term effects of the Ministry of Public Health's (MOPH) caries preventive interventions for 6- to 12-year-olds (supervised toothbrushing [STB], dental...
PURPOSE
To compare the long-term effects of the Ministry of Public Health's (MOPH) caries preventive interventions for 6- to 12-year-olds (supervised toothbrushing [STB], dental sealant, and combined STB+sealant) to the base case (no intervention) using the System Dynamics Model.
MATERIALS AND METHODS
The System Dynamics Model was used to evaluate the intervention scenarios of supervised toothbrushing (STB), sealant, and combined STB+sealant with the base-case scenario. The effectiveness data for the model's interventions were obtained from systematic reviews and meta-analyses.
RESULTS
The model determined that the caries-free population increased by 36.2%, 25.5%, and 14.5%, while the caries-affected population decreased by 8.1%, 5.5%, and 3.1% in the combined STB+sealant, sealant, and supervised toothbrushing scenarios compared to the base case at 15 years of age.
CONCLUSION
Combined STB+sealant is the most efficacious intervention among those administered to children between the ages of 6 and 12 with permanent teeth. In addition, the System Dynamics Model could be helpful in comparing interventions or policies to determine the optimal intervention for a given population.
Topics: Child; Humans; Dental Caries Susceptibility; Thailand; Pit and Fissure Sealants; Dental Caries; Dentition, Permanent
PubMed: 38047638
DOI: 10.3290/j.ohpd.b4721201 -
Global Pediatric Health 2023This study aimed to evaluate the knowledge, attitude, and practices of parents residing in Pakistan toward pits and fissure sealants in children. This descriptive,...
This study aimed to evaluate the knowledge, attitude, and practices of parents residing in Pakistan toward pits and fissure sealants in children. This descriptive, cross-sectional study was carried out between November 2022 to March 2023. An online questionnaire was distributed through various social media platforms. Independent t-test and Multiple Linear Regression analysis were performed. A total of 570 participants were recruited. For protection against tooth decay, most of the participants 456(80%) believed that fissure sealants should be placed to protect teeth from decay. Placement of fissure sealants was considered to be a cost-effective measure by majority of the 480 (84.2%) respondents. Fissure sealants are one of the most effective preventive measures against tooth decay. The knowledge, attitude and practice of parents were some being aware of fissure sealants and some were not. It appeared to support the placement of fissure sealants for their children.
PubMed: 38024465
DOI: 10.1177/2333794X231214090 -
Cureus Oct 2023Numerous aspects of dentistry have been transformed by smart materials. In recent years, there have been advancements in dental materials that exhibit improved... (Review)
Review
Numerous aspects of dentistry have been transformed by smart materials. In recent years, there have been advancements in dental materials that exhibit improved biological compatibility. These materials are specifically designed to interact effectively with the fluids found in the oral cavity, including saliva and gingival crevicular fluids. The search for the optimum restorative material results in the development of a more recent generation of dental materials known as smart materials. Smart materials react to stimuli, including stress, temperature, moisture, pH, electric field, and magnetic field, in a regulated way. Some of them are biomimetic and can imitate the dentin and enamel seen in natural teeth. These resources herald the start of a new era in dentistry known as "Smart Dentistry," and they project a promising future in terms of improved dependability and efficiency. These types of diverse materials can pick up and perform definite functionalities regarding adjustments in the nearby surroundings. Based on their capacity for recognition, analysis, and discrimination, these materials might be able to foresee problems in the near future. The superior biocompatibilities of smart materials, which have brought about a new generation of biosmart dentistry, are a crucial component of their utilization in numerous dental applications. We should use any material with intelligence as we progress in innovation and advanced technology. Additionally, we should purposefully incorporate intelligence into existing materials through design. Smart materials have proven advantageous in the field of dentistry, particularly in restorative applications. Various dental products, including smart composites, resin-modified glass ionomer materials, pit, and fissure sealants releasing amorphous calcium phosphate (ACP), smart ceramics, and compomers have all witnessed positive advancements due to the integration of smart materials.
PubMed: 38021683
DOI: 10.7759/cureus.47185