در هنگام جستجو کلمه در قسمت عنوان میتوانید کلمات مورد جستجو را با کاراکتر (-) جدا کنید.
کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Dentistry, Shiraz University of Medical Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی: Compressive strength,Calcium hydroxide,pulp capping material,calcium silicate,Resin-Modified Glass Ionomer
- چکیده:
- چکیده انگلیسی: Statement of the Problem: Adequate compressive strength is an important characteristic for an ideal liner.
Purpose: This study aimed to assess the compressive strength of several commonly used liners.
Materials and Method: This in vitro, experimental study evaluated 120 samples fabricated of Dycal, Calcimol LC, Vitrebond, Activa Bioactive, and TheraCal LC (n=24) liners according to the manufacturers’ instructions. The samples were fabricated using a cylindrical stainless steel mold with 6±0.1 mm height and 4±0.1 mm internal diameter. Half of the samples in each group (n=12) underwent compressive strength test immediately after completion of their primary setting while the other half (n=12) underwent compressive strength test after 24 h. During this period, the samples were immersed in deionized water (grade 3) and incubated at 37±1°C and 100% humidity for 24 h. The compressive strength was measured using a universal testing machine. Data were analyzed using two-way ANOVA followed by Tukey’s post-hoc test.
Results: The compressive strength of the five liners was significantly different (p < 0.05). Calcimol LC showed maximum compressive strength both immediately after setting and after 24 h. The compressive strength at 24 h was significantly higher than the primary compressive strength in all groups (p < 0.05).
Conclusion: Within the limitations of this study, it seems that Calcimol LC, Activa Bioactive Liner, and TheraCal LC have adequate compressive strength and can be used alone to provide adequate support for the restorative materials.- انتشار مقاله: 13-11-1398
- نویسندگان: Ladan Ranjbar Omrani,Zohreh Moradi,Mehdi Abbasi,Mohammad Javad Kharazifard,Seyedeh Niloufar Tabatabaei
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Dentistry, Shiraz University of Medical Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی: Hardness,Enamel Remineralization,Resin Infiltrant
- چکیده:
- چکیده انگلیسی: Statement of the Problem: The progression of incipient carious lesions may be simply prevented by non-invasive remineralization of lesions, eliminating the need for invasive and high-cost restorative procedures.
Purpose: This study aimed to assess the effect of two commonly used remineralizing agents and resin infiltration on surface micro hardness of incipient enamel lesions at different time points.
Materials and Method: In this in vitro study 45 intact human maxillary central incisors were selected. After disinfection, enamel samples measuring 5x5x2.5 mm were cut out of the labial surface of the teeth. The surface of samples was polished and they were mounted in auto-polymerizing acrylic resin. According to Amaechi’s method samples were immersed in acidified hydroxyethylcellulose system (pH = 4.5) for 96 hours to induce white spot lesions (WSLs). The baseline surface micro hardness of samples was measured using a Vickers hardness tester, then the samples were randomly divided into three groups (n=15) based on different remineralization methods: MI-Paste Plus, Remin Pro and ICON-Infiltrant according to the manufacturer’s instructions. All samples were stored in anti-dry mouth treatment agent during the experiment and their surface hardness was measured at 15 days (T1) and 20 weeks (T2).
Results: The hardness of samples in MI-Paste Plus and Remin Pro groups significantly increased at both T1 and T2 (p < 0.001) but this increase was not significant in ICON group (p > 0.05).
Conclusion: MI-Paste Plus and Remin Pro can efficiently increase the hardness of incipient enamel lesions.- انتشار مقاله: 14-09-1397
- نویسندگان: Parastou Behrouzi,Haleh Heshmat,Maryam Hoorizad Ganjkar,Seyedeh Farnaz Tabatabaei,Mohammad Javad Kharazifard
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Dentistry, Shiraz University of Medical Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی:
- چکیده:
- چکیده انگلیسی: Statement of the Problem: There are some concerns regarding the effect of chlorhexidine (CHX) applied for cavity disinfection on the bond strength of adhesive restorations to dentin.Purpose: This study sought to assess the effect of CHX on the shear bond strength (SBS) of Equia resin-modified glass ionomer cement (RMGIC) to dentin in permanent teeth.Materials and Method: In this experimental study, the buccal surface of 84 freshly extracted human premolars was ground to expose the flat dentin. The samples were randomly assigned to four groups (n=21). The steps were as following in the group Ia: conditioning, Equia RMGIC, 500 thermal cycles; group Ib: conditioning, Equia RMGIC, 6000 thermal cycles; group IIa: conditioning, CHX, Equia RMGIC, 500 thermal cycles, and group IIb: conditioning, CHX, Equia RMGIC, and 6000 thermal cycles. Twenty samples from each group were subjected to SBS test and one sample was inspected under a scanning electron microscope. Data were analyzed using two-way ANOVA and t-test.Results: The SBS was significantly different among the groups (p= 0.007). The groups subjected to 500 thermal cycles showed significantly higher SBS to dentin when they were treated with CHX (p= 0.000). There was no significant difference between samples thermocycled for 6000 cycles with and without application of CHX (p= 0.269). The SBS in the groups that were thermocycled for 6000 cycles (Ib and IIb) was lower than those thermocycled for 500 cycles (Ia and IIa). This difference between IIa and IIb was statistically significant (p= 0.007).Conclusion: Chlorhexidine can positively affect the short term SBS of Equia RMGIC to dentin.
- انتشار مقاله: 26-10-1395
- نویسندگان: Yasmin Sheikh Hasani,Mehrsa Paryab,Aida Saffarpour,Mohammad Javad Kharazifard,Mehdi Shahrabi
- مشاهده