Influence of simulated gastric juice on surface characteristics of CAD-CAM monolithic materials

Australian Journal of Basic and Applied Sciences, 2012

The aim of this study was to investigate the proper direct esthetic restorative materials to be used for bulimia nervosa patients. Therefore the effect of simulated gastric juice on the microhardness and surface roughness of five direct esthetic restorative materials was investigated. Simulated gastric juice was prepared and adjusted to pH 3.8. Sixty specimens of each restorative material, including a microhybrid composite resin, a nanofilled composite resin, a low shrinkage composite resin, a conventional glass ionomer, and a nanofilled glass-ionomer restorations, were prepared and divided into three groups (n=20). One group was immersed in distilled water (control), the second and third groups were immersed in the simulated gastric juice for 6 hours and 12 hours respectively. Each group was further subdivided into two groups (n=10), for surface topography characterization and for microhardness evaluation. Energy dispersive X-ray microanalysis and scanning electron microscopic analysis of selected samples were performed. Data were analyzed using 2-way analysis of variance and Tukey's post-hoc test. For all the tested materials, there was a statistically significant increase in mean Ra and decrease in mean microhardness after immersion in simulated gastric juice compared with the control groups. Ketac TM N100 after immersion for 6 hrs and 12 hrs showed the statistically significantly highest mean Ra values and lowest microhardness values, while Filtek TM Z350 showed the statistically significantly lowest mean Ra values and highest microhardness values. It was concluded that nanofilled composite resin was the most suitable material for restoration in patients suffering from bulimia nervosa.

Materials, 2019

CAD/CAM (computer-aided design/computer-aided manufacturing) for indirect restorative materials has been recently introduced in dentistry. The purpose of this study was to evaluate the change of the surface micro-hardness of different restorative CAD/CAM materials after exposure to a carbonated acidic drink (Coca-Cola, Coca-Cola Company, Milan, Italy). One hundred and eighty specimens of identical size (2 mm thickness) were obtained by sectioning each tested CAD/CAM block of four materials: a hybrid ceramic (CERASMART™, GC Corporation, Tokyo, Japan), a resin nano ceramic (Lava™ Ultimate, 3M, Monrovia, CA, USA), a nanohybrid composite (Grandio blocs, VOCO GmbH, Cuxhaven, Germany), and a zirconia-reinforced lithium silicate glass ceramic (VITA SUPRINITY® PC; VITA Zahnfabrik, Bad Sackingen, Germany). Forty-five specimens of each material were tested. Micro-hardness was measured at baseline, after 7 days and after 28 days. The data were analyzed. The micro-hardness of each material vari...

Medicina

Background and Objectives: The aim of this in vitro study was to evaluate the effect of gastric acid associated with the effect of toothbrushing on the surface roughness of different types of composite resin used for direct restorations. Materials and Methods: The materials used in this study were two microhybrid (Filtek Z250, Herculite XRV) and two nanohybrid (Filtek Z550, Herculite XRV Ultra) composite resins. Two hundred and forty cylindrical samples with a height of 2 mm and a diameter of 6 mm were divided into four groups (groups A, B, C and D) corresponding to each tested material (n = 60). Each group was divided in two subgroups: subgroup I—the samples were submersed in hydrochloric acid and immediately submitted to toothbrushing; subgroup II—the samples were submitted only to toothbrushing. The simulation of the acid attack was performed by immersing the samples in a 0.01 M hydrochloric acid solution for 90 min. This procedure was followed immediately by toothbrushing simula...

Egyptian Dental Journal, 2021

Purpose: The purpose of this in vitro study was to evaluate the effect of simulated gastric acidity on surface roughness of different types of dental ceramics. Methods: Fifty specimens were divided according to type of the material into five groups (n=10), as follows: Partially stabilized zirconia (PSZ) (Prettaue), Fully stabilized zirconia (FSZ) (Prettaue Anterior), lithium disilicate ceramics (IPS. Emax), Zirconia-containing lithium silicate ceramics (ZLS) (Vita Suprinity) and Hybrid ceramics (Vita Enamic). Specimens were cut using a low-speed diamond saw (Isomet) into a rectangular shape with the following dimension: 12mm width x 14mm length x 1 mm thickness. Surface roughness was evaluated by optical profilometer. Each specimen was immersed in 5 ml of the simulated acid of ph 1.2 for 96 h in a37˚C incubator. Surface roughness of all tested groups was revaluated. One-way ANOVA was used to compare mean difference between groups. Paired t-test was used for comparing (before and after) roughness in each group. Results: There was significant difference (P=0.002) between all groups. There was increase in surface roughness for all materials tested, but it was non-significant (P>0.05) for Prettaue (P=0.607), Prettaue Anterior (P=0.273) and Vita Suprinty group (P=0.201). There was significant increase (P≤0. 05) for IPS. Emax group (P=0.007) and Vita Enamic groups (P=0.021). Prettaue Anterior group showed the least amount of surface roughness change (0.0006±0.002), while Vita Enamic group showed the highest surface roughness change (0.0100±0.011). Conclusions: The gastric acid significantly increased the surface roughness of hybrid ceramics and lithium disilicate ceramics.

Egyptian Dental Journal

Purpose: The purpose of this in vitro study was to evaluate the impact of simulated gastric acidity on color stability of different types of dental ceramics. Materials and Methods: Fifty specimens were constructed according to type of the material into five groups (n=10), as follows: Partially stabilized zirconia (PSZ) (Prettaue), Fully stabilized zirconia (FSZ) (Prettaue Anterior), lithium disilicate ceramics (IPS. Emax), Zirconia-containing lithium silicate ceramics (ZLS) (Vita Suprinity) and Hybrid ceramics (Vita Enamic). All specimens were cut with a low-speed diamond saw (Isomet) into a rectangular shape with the following dimension: 12mm width x 14mm length x 1 mm thickness. Color stability was evaluated by reflective spectrophotometer. Each specimen was immersed in 5 ml of the simulated acid of ph 1.2 for 96 h in a 37˚C incubator. One-way ANOVA was used to compare mean difference between groups. Results: There was highly significant difference (P=0.000) between all groups. Prettaue group showed the least amount of color change (2.97±1.27), while vita enamic group showed the highest color change (5.97±3.29). Conclusions: The gastric acid changed the color of all types of dental ceramics. Except for Partially stabilized zirconia and lithium disilicate ceramics, the color change of all other ceramics was noticeable to the human eye and then was clinically unacceptable..

Journal of Pharmaceutical Research International

Introduction: Dental materials whenever used for restorations in the oral cavity can be subjected to dental erosion because of the gastric juices and can cause roughness and act as a nidus for the growth plaque. Aim of this study was to evaluate impact of artificial gastric acid on surface roughness of dental restorations, examining scientific studies published from 2010-2020. Materials and Methods: This study follows and complies with principles of PRISMA guidelines for a systematic review research methodology. In March 2020, an initial search was carried out in the MEDLINE (PubMed), Science Direct, Google Scholar, and Saudi Digital Library database of indexed journals from 2010-2020 using the keywords: impact,” “effect,” “gastric acid,” “gastric juice,” “indirect restorations,” “dental materials,” “dental ceramics,” “crowns,”. Bibliographic materials from these articles were then utilized to find other sources. Results: The MEDLINE (PubMed) search retrieved thirty articles, of wh...

Ceramics, 2024

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Odontology

A total of 20 lithium disilicate glass–ceramics (IPS e.max CAD, Ivoclar Vivadent) and 20 resin nano-ceramic (Voco Grandio Blocks) onlay restorations were performed in 20 patients using a split-mouth design to compare the two-year clinical performance of lithium disilicate and resin nano-ceramic onlay restorations. Both restorations were evaluated at baseline, one-year, and two-year clinical follow-ups based on the modified United States Public Health Service (USPHS) criteria. Chi-square and Fisher’s exact tests showed no statistically significant difference between Voco Grandio and IPS e.max ceramic restorations for all evaluated parameters during the different follow-up periods (p > 0.05). Cochrane’s and MC-Nemar’s tests indicated statistically significant differences regarding color match within the Voco Grandio group. They also indicated statistically significant differences in marginal discoloration, marginal adaptation, surface texture, and postoperative hypersensitivity wit...

Journal of Dental and Allied Sciences, 2018

Esthetic dentistry, driven by a high demand for esthetically appealing and naturally looking restorations, especially, all-ceramic restorations, has become a segment of dentistry which has experienced tremendous improvements in the recent years. The increasing use of polycrystalline alumina and zirconia as framework materials and the increasing popularity and variety of computer-aided design and computer-aided manufacturing (CAD-CAM) systems seem to be mutually accelerating trends. In fact, CAD-CAM technology opens up a new opportunity for dental biomaterials scientists in the research field. Newer and improved materials are available at every moment. The present review gives an overview on the different materials available in ceramics used in dental CAD/CAM technology. A search of English language peer-reviewed literature was undertaken using MEDLINE and PubMed with a focus on CAD-CAM ceramic articles published between 1996 and 2014. A hand search of nonindexed literature was, also...

Medical problems such as gastroesophageal reflux disease can cause considerable damage to restorations in the oral environment. This study evaluated the effects of gastric juice on the surface characteristics of different types of laboratory-processed indirect composites with different filler particles and polymerization modes. Specimens were prepared from Tescera (TES; Bisco), Sinfony (SIN; 3M ESPE), Solidex (SOL; Shofu), and Adoro (AD; Ivoclar Vivadent). Before exposing the specimens to simulated gastric juice for 24 h, color, surface roughness, and microhardness were measured on one half of the polished flat surface of each specimen. After exposure to the simulated gastric juice, the same tests were repeated on the other half of specimen surface. Results indicated that gastric juice had a significant impact on color change (p<0.001). AD showed the largest surface roughness change among the resins (p<0.001). Gastric juice also significantly affected the microhardness of the materials, and AD and TES showed statistically similar change in microhardness (p>0.05).