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Effect of nanofilled self-adhesive protective coating on color changes and surface roughness of composite resin Rinastiti, Margareta; Widyastuti, Andina
Odonto : Dental Journal Vol 10, No 1 (2023): July 2023
Publisher : Faculty of Dentistry, Universitas Islam Sultan Agung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30659/odj.10.1.28-36

Abstract

Background: Discoloration of composite restorations may affecting aesthetic appearance. The aging-process and surface roughness may influence color changes. A nanofilled self-adhesive protecting coating has been developed for coating tooth restoration and expected to prolong the longevity of restoration. To evaluate the effect of nanofilled self-adhesive protective coating on the surface roughness and color-changes of flowable and packable composite after aging condition. Methods: The total of 40 discs (15x2mm) and 60 boxes (20×10× 2mm) specimens from flowable and packable composite were used. A half of the specimens was coated by using protective-coating. The reflectance chromameter was used to measure the color baseline. Afterward, the specimens were subjected into aging process by immersing in artificial saliva and carbonated drink (37oC,7d). The color changes were calculated based on the [CIE L*a*b*].For surface roughness, box-shaped specimens were measured in fresh condition, after aging conditions. Results: The color change ranged from 0.49 to 2.31. Applying protective-coating was associated with a significant decrease in the color-changes and surface roughness after aging. The changes of three color coordinates resulted in significant differences for both composite, with and without protective coating application. Conclusion: The application of protective-coating decrease the color-changes and surface roughness of flowable and packable composite-resin.
Effect of adhesive techniques and preheated composite resin types as luting agents on shear bond strength of lithium disilicate: an experimental study Damayanti, Asri; Untara, Raphael Tri Endra; Widyastuti, Andina
Padjadjaran Journal of Dentistry Vol 38, No 1 (2026): March 2026
Publisher : Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/pjd.vol38no1.61837

Abstract

Introduction: The success of veneers is influenced by the cementation procedure. Preheated composite resin has been proposed as a luting material for indirect adhesive restorations because of its improved mechanical and handling properties. Composite resin bonds effectively to tooth structures using adhesive systems. This study aimed to evaluate the effect of different adhesive application techniques and types of preheated composite resin as luting materials on the shear bond strength of lithium disilicate. Methods: Twenty-eight extracted maxillary premolars were prepared on the buccal surface to expose dentin and divided into four experimental groups. Lithium disilicate discs (3 mm in diameter and 1 mm in thickness) were cemented onto the prepared surfaces according to the assigned group protocols. Group IA received preheated microhybrid composite with total-etch adhesive, IB received self-etch adhesive; IIA received preheated nanohybrid composite with total-etch adhesive, and IIB received self-etch adhesive. After cementation, the samples were immersed in artificial saliva at 37oC for 24 hours. Shear bond strength testing was conducted using a universal testing machine. Debonded samples were observed under a stereomicroscope to determine bonding failure. Data were analyzed using two-way ANOVA and post hoc LSD tests with a 95% confidence level. Results: Total-etch adhesive demonstrated higher shear bond strength (SBS) than self-etch adhesive for both composite types. The highest SBS was observed in the total-etch microhybrid group (14.03 ± 0.12 MPa), followed by the total-etch nanohybrid group (12.99 ± 0.09 MPa) and the self-etch microhybrid group (13.67 ± 0.18 MPa), while the lowest value was recorded in the self-etch nanohybrid group (10.21 ± 0.22 MPa) Conclusion: Preheated microhybrid composite resin produced higher shear bond strength with lithium disilicate than preheated nanohybrid composite resin, and the total-etch adhesive technique resulted in higher shear bond strength than the self-etch technique.
The effect of final irrigation solution and irrigation techniques on the flexural strength and elastic modulus of root canal dentin: an experimental study yuniva, Hasna syifa; Ratih, Diatri Nari; Widyastuti, Andina
Jurnal Kedokteran Gigi Universitas Padjadjaran Vol 38, No 1 (2026): April 2026
Publisher : Fakultas Kedokteran Gigi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/jkg.v38i1.61894

Abstract

Introduction: Root canal irrigation facilitates debris removal, lubrication, and the dissolution of organic and inorganic tissues while preventing smear layer formation. However, the chelating properties of final irrigants may deplete calcium ions from the dentin, potentially compromising the flexural strength and modulus of elasticity of the root canal walls. This study aims to analyze the effects of various final irrigants and agitation techniques on these mechanical properties of radicular dentin. Methods: Forty-five mandibular premolars were prepared and randomly divided into three groups (n=15). Group 1 was irrigated with 17% EDTA, Group 2 with 0.2% chitosan nanoparticles, and Group 3 with Ultra Clean. Each group was further subdivided into three subgroups (n=5) based on the agitation technique used: manual (A), sonic (B), and ultrasonic (C). Flexural strength and elastic modulus were measured using a Universal Testing Machine (UTM). Results: Two-way ANOVA showed that the type of irrigating solution, agitation technique, and their interaction significantly affected flexural strength and elastic modulus (p<0.05). Post-hoc LSD analysis revealed significant differences among groups for both flexural strength and elastic modulus (p<0.05), with several exceptions in specific comparisons within the EDTA and Ultra Clean groups, as well as between Ultra Clean manual agitation subgroup and the 0.2% chitosan nanoparticle subgroup (p>0.05). Conclusion: The highest flexural strength and elastic modulus values were observed in the group treated with 0.2% chitosan nanoparticles combined with sonic agitation, while the lowest values were found in the 17% EDTA group using manual agitation.Efek jenis bahan irigasi akhir dan teknik irigasi terhadap kekuatan fleksural dan modulus elastisitas dentin saluran akar: studi eksperimental in vitroPendahuluan: Irigasi saluran akar berfungsi membersihkan debris, melumasi saluran, melarutkan jaringan organik dan anorganik, serta mencegah terbentuknya smear layer. Namun, sifat khelasi pada bahan irigasi akhir berpotensi mengikis dinding saluran akar dengan mengikat ion kalsium, yang dapat memengaruhi kekuatan fleksural dan modulus elastisitas dentin. Penelitian ini bertujuan untuk menganalisis pengaruh jenis bahan irigasi akhir dan teknik agitasi terhadap sifat mekanis dentin saluran akar akar. Metode: Empat puluh lima premolar mandibula di preparasi, dibagi menjadi tiga kelompok secara acak masing-masing kelompok terdiri dari 15 sampel. Kelompok 1 di irigasi dengan EDTA, kelompok 2 diirigasi dengan kitosan nanopartikel 0,2% dan kelompok 3 di irigasi dengan Ultra clean. Masing-masing kelompok dibagi lagi menjadi 3 kelompok dan setiap kelompok terdiri 5 sampel. Kelompok A digitasi manual, kelompok B sonik, dan kelompok C ultrasonik. Setelah itu dilakukan uji =kekuatan fleksural dan modulus elastisitas dengan Universal Testing Machine (UTM). Hasil: Uji ANAVA Bahan irigasi akhir, teknik irigasi, dan interaksi keduanya berpengaruh signifikan terhadap kekuatan fleksural dan modulus elastisitas (p<0,05). Hasil Post-Hoc LSD menunjukkan perbedaan signifikan antarkelompok untuk kekuatan fleksural dan modulus elastisitas dentin (p<0,05), dengan beberapa pengecualian pada perbandingan metode tertentu dalam kelompok EDTA 17% dan Ultra Clean, serta antara Ultra Clean manual dan kitosan nanopartikel 0,2% (p>0,05). Simpulan: Nilai kekuatan fleksural dan modulus elastisitas tertinggi pada penggunaan kitosan nanopartikel 0,2% dengan teknik agitasi sonik serta terendah pada penggunaan EDTA 17% dengan teknik agitasi manual.