1
|
Baltacioğlu İH, Demirel G, Öztürk B, Aydin F, Orhan K. Marginal adaptation of bulk-fill resin composites with different viscosities in class II restorations: a micro-CT evaluation. BMC Oral Health 2024; 24:228. [PMID: 38350901 PMCID: PMC10863248 DOI: 10.1186/s12903-024-03975-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Accepted: 02/02/2024] [Indexed: 02/15/2024] Open
Abstract
BACKGROUND The purpose of this study is to evaluate the marginal adaptation of bulk-fill resin composites with different viscosities (paste-like and flowable) in Class II restorations using micro-CT imaging. METHODS Forty extracted human molars were used. Mesial and distal Class II box cavities (approximately 3 mm x 3 mm x 4 mm) were prepared for each tooth, with cavity floors located 1 mm below the enamel-cementum junction. Following adhesive application, teeth were restored using eight different groups: Group XB: X-tra Base Bulk-fill Flowable (VOCO), Group XF: X-tra Fill Bulk-fill (VOCO), Group FB: Filtek Bulk-fill Posterior (3 M ESPE), Group FF: Filtek Bulk-fill Flowable (3 M ESPE), Group BB: Beautifil-Bulk (SHOFU), Group BF: Beautifil-Bulk Flowable (SHOFU), and Group CO: "as a control group", Clearfil Majesty Posterior (KURARAY) and Group CF: "as a control group", Clearfil Majesty Flow + Clearfil Majesty Posterior (KURARAY). The restored teeth underwent an aging protocol involving 1000 cycles in a water bath fluctuating between 5 ± 1.0 °C and 55 ± 1.0 °C. Post-aging, teeth were immersed in 50% silver nitrate solution for 24 h and then in a film developer solution for 8 h. Microleakage analysis was performed using micro-CT, evaluated with 3D Slicer software. A two-way ANOVA was employed for statistical analysis. RESULTS Two-way ANOVA results indicated significant effects of both viscosity (p < 0.0001) and composite type (p < 0.0001) on marginal adaptation. Viscosity analysis (comparing flowable and paste-like) revealed no significant differences in the FB-FF, XB-XF and BB-BF groups but significant differences in the and CO-CF group, with flowable type exhibiting less microleakage than paste-like type. CONCLUSIONS The study suggests that while the viscosity of bulk-fill composites did not significantly affect marginal adaptation, the brand of bulk-fill composite did influence it.
Collapse
Affiliation(s)
| | - Gülbike Demirel
- Department of Restorative Dentistry, Faculty of Dentistry, Ankara University, Ankara, Turkey.
| | - Burcu Öztürk
- Department of Restorative Dentistry, Faculty of Dentistry, Ankara University, Ankara, Turkey
| | - Fulya Aydin
- Department of Restorative Dentistry, Faculty of Dentistry, Ankara Medipol University, Ankara, Turkey
| | - Kaan Orhan
- Department of Maxillofacial Radiology, Faculty of Dentistry, Ankara University, Ankara, Turkey
| |
Collapse
|
2
|
Kantovitz KR, Cabral LL, Carlos NR, de Freitas AZ, Peruzzo DC, Franca F, do Amaral F, Basting RT, Puppin-Rontani RM. Impact of Resin Composite Viscosity and Fill-technique on Internal Gap in Class I Restorations: An OCT Evaluation. Oper Dent 2021; 46:537-546. [PMID: 34929042 DOI: 10.2341/20-144b-l] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/21/2020] [Indexed: 11/23/2022]
Abstract
The aim of this in vitro study was to quantitatively evaluate the internal gap of resin composites of high-and low-viscosity used in single- and incremental-fill techniques in Class I cavities exposed to thermal cycling (TC) using optical coherence tomography (OCT). Cavities of 4-mm depth and 3-mm diameter were prepared in 36 third molars randomly distributed into four groups, according to viscosity of restorative resin-based composite (high or low viscosity, all from 3M Oral Care) and technique application (bulk or incremental fill) used (n=9): RC, high-viscosity, incremental-fill, resin-based composite (Filtek Z350 XT Universal Restorative); BF, high-viscosity, bulk-fill, resin-based composite (Filtek One Bulk Fill); LRC, low-viscosity, incremental-fill, resin-based composite (Filtek Z350 XT Flowable Universal Restorative); and LBF, low-viscosity, bulk-fill, resin-based composite (Filtek Flowable Restorative). Single Bond Universal Adhesive system (3M Oral Care) was used in all the experimental groups. The incremental-fill technique was used for RC and LRC groups (2-mm increments), and a single-layer technique was used for BF and LBF groups, as recommended by the manufacturer. The internal adaptation of the resin at all dentin walls was evaluated before and after TC (5000 cycles between 5°C and 55°C) using OCT images. Five images of each restored tooth were obtained. Images were analyzed using ImageJ software that measured the entire length of the gaps at the dentin-restoration interface. The length of gaps (μm) was analyzed using two-way repeated measures ANOVA and the Tukey tests (α=0.05). There was a significant interaction between material types and TC (p=0.006), and a significant difference among all material types (p<0.0001), before and after TC (p<0.0001). Increased internal gaps at the dentin-restoration interface were noticed after TC for all groups. RC presented the lowest value of internal gap before and after TC, while LBF showed the highest values of internal gap after TC. In conclusion, TC negatively affected the integrity of internal gap, whereas high-viscosity, incremental-fill, resin-based composite presented better performance in terms of internal adaptation than low-viscosity, bulk-fill materials in Class I cavities.
Collapse
Affiliation(s)
- K R Kantovitz
- *Kamila Rosamilia Kantovitz, DDS, MS, PhD, Faculdade São Leopoldo Mandic, Dental Material Area Campinas, SP, Brazil. State University of Campinas (UNICAMP), Piracicaba Dental School, Department of Pediatric Dentistry, Piracicaba, SP, Brazil
| | - L L Cabral
- Lais Lemos Cabral, DDS, MS, Faculdade São Leopoldo Mandic, Dental Material Area Campinas, SP, Brazil. University Center Tiradentes (UNIT), Restorative Dentistry Area, Maceió, AL, Brazil
| | - N R Carlos
- Natalia Russo Carlos, DDS, MS, PhD student, Faculdade São Leopoldo Mandic, Dental Material Area Campinas, SP, Brazil
| | - A Z de Freitas
- Anderson Zanardi de Freitas, PhD, Nuclear and Energy Research Institute, IPEN-CNEN/SP, Department of Center of Lasers and Applications, Sáo Paulo, SP, Brazil
| | - D C Peruzzo
- Daiane Cristina Peruzzo, DDS, MS, PhD, Faculdade São Leopoldo Mandic, Periodontics Area, Campinas, SP, Brazil
| | - Fmg Franca
- Fabiana Mantovani Gomes Franca, DDS, MS, PhD, Faculdade São Leopoldo Mandic, Restorative Dentistry Area, Campinas, SP, Brazil
| | - Flb do Amaral
- Flavia Lucisano Botelho do Amaral, DDS, MS, PhD, Faculdade São Leopoldo Mandic, Restorative Dentistry Area, Campinas, SP, Brazil
| | - R T Basting
- Roberta Tarkany Basting, DDS, MS, PhD, Faculdade São Leopoldo Mandic, Restorative Dentistry Area, Campinas, SP, Brazil
| | - R M Puppin-Rontani
- Regina Maria Puppin-Rontani, DDS, MS, PhD, State University of Campinas (UNICAMP), Piracicaba Dental School, Department of Pediatric Dentistry, Piracicaba, SP, Brazil
| |
Collapse
|
3
|
Kaisarly D, Meierhofer D, El Gezawi M, Rösch P, Kunzelmann KH. Effects of flowable liners on the shrinkage vectors of bulk-fill composites. Clin Oral Investig 2021; 25:4927-4940. [PMID: 33506426 PMCID: PMC8342399 DOI: 10.1007/s00784-021-03801-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2020] [Accepted: 01/19/2021] [Indexed: 01/08/2023]
Abstract
Objectives This investigation evaluated the effect of flowable liners beneath a composite restoration applied via different methods on the pattern of shrinkage vectors. Methods Forty molars were divided into five groups (n = 8), and cylindrical cavities were prepared and bonded with a self-etch adhesive (AdheSe). Tetric EvoCeram Bulk Fill (TBF) was used as the filling material in all cavities. The flowable liners Tetric EvoFlow Bulk Fill (TEF) and SDR were used to line the cavity floor. In gp1-TBF, the flowable composite was not used. TEF was applied in a thin layer in gp2-fl/TEF + TBF and gp3-fl/TEF + TBFincremental. Two flowable composites with a layer thickness of 2 mm were compared in gp4-fl/TEF + TBF and gp5-fl/SDR + TBF. TEF and SDR were mixed with radiolucent glass beads, while air bubbles inherently present in TBF served as markers. Each material application was scanned twice by micro-computed tomography before and after light curing. Scans were subjected to image segmentation for calculation of the shrinkage vectors. Results The absence of a flowable liner resulted in the greatest shrinkage vectors. A thin flowable liner (gp2-fl/TEF + TBFbulk) resulted in larger overall shrinkage vectors for the whole restoration than a thick flowable liner (gp4-fl/TEF + TBF). A thin flowable liner and incremental application (gp3-fl/TEF + TBFincremental) yielded the smallest shrinkage vectors. SDR yielded slightly smaller shrinkage vectors for the whole restoration than that observed in gp4-fl/TEF + TBF. Conclusions Thick flowable liner layers had a more pronounced stress-relieving effect than thin layers regardless of the flowable liner type. Clinical relevance It is recommended to apply a flowable liner (thin or thick) beneath bulk-fill composites, preferably incrementally.
Collapse
Affiliation(s)
- Dalia Kaisarly
- Department of Conservative Dentistry and Periodontology, University Hospital, Ludwig-Maximilians-University, Goethestrasse 70, 80336, Munich, Germany. .,Biomaterials Department, Faculty of Oral and Dental Medicine, Cairo University, Cairo, Egypt.
| | - D Meierhofer
- Department of Conservative Dentistry and Periodontology, University Hospital, Ludwig-Maximilians-University, Goethestrasse 70, 80336, Munich, Germany
| | - M El Gezawi
- Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
| | - P Rösch
- University of Applied Sciences, Augsburg, Germany
| | - K H Kunzelmann
- Department of Conservative Dentistry and Periodontology, University Hospital, Ludwig-Maximilians-University, Goethestrasse 70, 80336, Munich, Germany
| |
Collapse
|
4
|
Shrinkage vectors in flowable bulk-fill and conventional composites: bulk versus incremental application. Clin Oral Investig 2020; 25:1127-1139. [PMID: 32653992 PMCID: PMC7878238 DOI: 10.1007/s00784-020-03412-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Accepted: 06/11/2020] [Indexed: 10/25/2022]
Abstract
OBJECTIVES Sufficient depth of cure allows bulk-fill composites to be placed with a 4-mm thickness. This study investigated bulk versus incremental application methods by visualizing shrinkage vectors in flowable bulk-fill and conventional composites. MATERIALS AND METHODS Cylindrical cavities (diameter = 6 mm, depth = 4 mm) were prepared in 24 teeth and then etched and bonded with OptiBond FL (Kerr, Italy). The composites were mixed with 2 wt% radiolucent glass beads. In one group, smart dentin replacement (SDR, Dentsply) was applied in bulk "SDR-bulk" (n = 8). In two groups, SDR and Tetric EvoFlow (Ivoclar Vivadent) were applied in two 2-mm-thick increments: "SDR-incremental" and "EvoFlow-incremental." Each material application was scanned with a micro-CT before and after light-curing (40 s, 1100 mW/cm2), and the shrinkage vectors were computed via image segmentation. Thereafter, linear polymerization shrinkage, shrinkage stress and gelation time were measured (n = 10). RESULTS The greatest shrinkage vectors were found in "SDR-bulk" and "SDR-increment2," and the smallest were found in "SDR-increment1-covered" and "EvoFlow-increment1-covered." Shrinkage away from and toward the cavity floor was greatest in "SDR-bulk" and "EvoFlow-increment2," respectively. The mean values of the shrinkage vectors were significantly different between groups (one-way ANOVA, Tamhane's T2 test, p < 0.05). The linear polymerization shrinkage and shrinkage stress were greatest in Tetric EvoFlow, and the gelation time was greatest in "SDR-bulk." CONCLUSIONS The bulk application method had greater values of shrinkage vectors and a higher debonding tendency at the cavity floor. CLINICAL RELEVANCE Incremental application remains the gold standard of composite insertion.
Collapse
|
5
|
STRAZZI-SAHYON HB, ROCHA EP, ASSUNÇÃO WG, DOS SANTOS PH. Role of adhesive systems on the luting interface’s thickness of ceramic laminate veneers. Braz Oral Res 2020; 34:e063. [DOI: 10.1590/1807-3107bor-2020.vol34.0063] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Accepted: 04/30/2020] [Indexed: 11/22/2022] Open
|
6
|
Han SH, Sadr A, Shimada Y, Tagami J, Park SH. Internal adaptation of composite restorations with or without an intermediate layer: Effect of polymerization shrinkage parameters of the layer material. J Dent 2018; 80:41-48. [PMID: 30391684 DOI: 10.1016/j.jdent.2018.10.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Revised: 10/19/2018] [Accepted: 10/31/2018] [Indexed: 10/27/2022] Open
Abstract
OBJECTIVES The purpose of this study was to compare the internal adaptation of resin composite restorations in Class I cavities with or without an intermediate layer, and to identify the relationships between the internal adaptation and the polymerization shrinkage parameters of the layer material. METHODS Class I cavities prepared in human third molars were treated with a one-step self-etch adhesive (G-Premio Bond, GC). In the control group, Tetric-EvoCeram Bulk-Fill (TBF, Ivoclar Vivadent) was placed using the bulk-fill technique and then light-cured. In the experimental groups, six different layer materials (three flowable resin composites, two bulk-fill resin composites, and a resin-modified glass-ionomer) were applied to a 1.5-mm thickness and light-cured, which was followed by TBF filling. After thermo-cycling, internal adaptation was measured using swept-source optical coherence tomography (SS-OCT) imaging and compared in terms of high brightness percentage (HB%) to represent the microgap. Shrinkage strain (SS), flexural modulus (FM), and polymerization shrinkage stress of the intermediate layer-resin composite complex (PS) were measured for each material. The relationships among HB%, SS, FM, and PS were evaluated statistically. RESULTS Groups with an intermediate layer showed lower HB% than the control group. The HB% correlated with PS (Pearson's correlation: R2 = 0.883, p < 0.05), and the PS correlated with the product of SS and FM. CONCLUSION Internal adaptation depended on the polymerization shrinkage stress of the intermediate layer-resin composite complex. CLINICAL SIGNIFICANCE Bulk-fill resin composite, which can show low polymerization shrinkage stress, may be used as an intermediate layer for better internal adaptation.
Collapse
Affiliation(s)
- Seung-Hoon Han
- Department of Conservative Dentistry, St. Vincent Hospital, College of Medicine, Catholic University of Korea, #93 Jungbu-daero, Paldal-gu, Suwon, Gyeonggi-do, South Korea.
| | - Alireza Sadr
- Department of Restorative Dentistry, School of Dentistry, University of Washington, 1959 NE Pacific St, B162, Seattle, WA, USA.
| | - Yasushi Shimada
- Department of Operative Dentistry, Okayama University, 2-5-1 Shikata-cho, Kita-ku, Okayama, 700-8525, Japan; Department of Cariology and Operative Dentistry, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 1-5-45, Japan.
| | - Junji Tagami
- Department of Cariology and Operative Dentistry, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 1-5-45, Japan.
| | - Sung-Ho Park
- Department of Conservative Dentistry, Oral Science Research Center, College of Dentistry, Yonsei University, #50 Yonsei- ro, Seodaemun-gu, Seoul, Republic of Korea.
| |
Collapse
|
7
|
Thanatvarakorn O, Prasansuttiporn T, Thittaweerat S, Foxton RM, Ichinose S, Tagami J, Hosaka K, Nakajima M. Smear layer-deproteinizing improves bonding of one-step self-etch adhesives to dentin. Dent Mater 2018; 34:434-441. [DOI: 10.1016/j.dental.2017.11.023] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2017] [Revised: 10/08/2017] [Accepted: 11/24/2017] [Indexed: 11/28/2022]
|
8
|
Nikaido T, Tagami J, Yatani H, Ohkubo C, Nihei T, Koizumi H, Maseki T, Nishiyama Y, Takigawa T, Tsubota Y. Concept and clinical application of the resin-coating technique for indirect restorations. Dent Mater J 2017; 37:192-196. [PMID: 29279548 DOI: 10.4012/dmj.2017-253] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The resin-coating technique is one of the successful bonding techniques used for the indirect restorations. The dentin surfaces exposed after cavity preparation are coated with a thin film of a coating material or a dentin bonding system combined with a flowable composite resin. Resin coating can minimize pulp irritation and improve the bond strength between a resin cement and tooth structures. The technique can also be applied to endodontically treated teeth, resulting in prevention of coronal leakage of the restorations. Application of a resin coating to root surface provides the additional benefit of preventing root caries in elderly patients. Therefore, the coating materials have the potential to reinforce sound tooth ("Super Tooth" formation), leading to preservation of maximum tooth structures.
Collapse
Affiliation(s)
- Toru Nikaido
- Department of Cariology and Operative Dentistry, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU)
| | - Junji Tagami
- Department of Cariology and Operative Dentistry, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU)
| | - Hirofumi Yatani
- Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry
| | - Chikahiro Ohkubo
- Department of Removable Prosthodontics, Tsurumi University School of Dental Medicine
| | - Tomotaro Nihei
- Division of Clinical Biomaterials, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University
| | - Hiroyasu Koizumi
- Department of Fixed Prosthodontics, Nihon University School of Dentistry
| | - Toshio Maseki
- Department of Adhesive Dentistry, School of Life Dentistry at Tokyo, The Nippon Dental University
| | - Yuichiro Nishiyama
- Department of Removable Prosthodontics, Tsurumi University School of Dental Medicine
| | | | | |
Collapse
|
9
|
Guan R, Takagaki T, Matsui N, Sato T, Burrow MF, Palamara J, Nikaido T, Tagami J. Dentin bonding performance using Weibull statistics and evaluation of acid-base resistant zone formation of recently introduced adhesives. Dent Mater J 2016; 35:684-93. [PMID: 27335136 DOI: 10.4012/dmj.2016-059] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Dentin bonding durability of recently introduced dental adhesives: Clearfil SE Bond 2 (SE2), Optibond XTR (XTR), and Scotchbond Universal (SBU) was investigated using Weibull analysis as well as analysis of the micromorphological features of the acid-base resistant zone (ABRZ) created for the adhesives. The bonding procedures of SBU were divided into three subgroups: self-etch (SBS), phosphoric acid (PA) etching on moist (SBM) or dry dentin (SBD). All groups were thermocycled for 0, 5,000 and 10,000 cycles followed by microtensile bond strength testing. Acid-base challenge was undertaken before SEM and TEM observations of the adhesive interface. The etch-and-rinse method with SBU (SBM and SBD) created inferior interfaces on the dentin surface which resulted in reduced bond durability. ABRZ formation was detected with the self-etch adhesive systems; SE2, XTR and SBS. In the PA etching protocols of SBM and SBD, a thick hybrid layer but no ABRZ was detected, which might affect dentin bond durability.
Collapse
Affiliation(s)
- Rui Guan
- Cariology and Operative Dentistry, Department of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | | | | | | | | | | | | | | |
Collapse
|
10
|
Scotti N, Alovisi C, Comba A, Ventura G, Pasqualini D, Grignolo F, Berutti E. Evaluation of Composite Adaptation to Pulpal Chamber Floor Using Optical Coherence Tomography. J Endod 2015; 42:160-3. [PMID: 26603769 DOI: 10.1016/j.joen.2015.10.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2015] [Revised: 10/07/2015] [Accepted: 10/08/2015] [Indexed: 01/08/2023]
Abstract
INTRODUCTION A coronal seal is fundamental for a positive outcome to endodontic therapy. In this in vitro study, we evaluated the adaptation of composite resins in postendodontic restorations using optical coherence tomographic (OCT) imaging. Our null hypothesis was that there would be no difference in marginal adaptation to the pulp chamber floor between resin composites of different viscosities. METHODS Thirty intact upper molars extracted for periodontal reasons were selected, endodontically treated, and filled with gutta-percha. The excess gutta-percha was entirely removed from the pulp chamber floor, and teeth were randomly divided into 3 groups (n = 10) according to the material used for the restoration: group 1: 0.5-mm horizontal layer of flowable composite followed by nanohybrid composite, group 2: bulk layering of bulk fill flowable composite; and group 3: oblique layering of nanohybrid composite. The degree of adaptation to the cavity floor was assessed using OCT imaging, and images were analyzed with the software program ImageJ (National Institutes of Health, Bethesda, MD) to assess the marginal gap between the composite and the pulp chamber floor. Collected data were statistically analyzed using analysis of variance testing, and statistical significance was set at P < .05. RESULTS Flowable composites showed significantly better adaptation than traditional packable nanohybrid composites (P < .05). All significant differences were found between groups 1 and 2. CONCLUSIONS Within the limitations of this OCT imaging-based in vitro study, it was concluded that the flowable composite (flow + nanofilled; flow bulk fill composite) adapted better to the pulp chamber floor than the packable nanohybrid composite resin. Further studies are necessary to confirm these results.
Collapse
Affiliation(s)
- Nicola Scotti
- Department of Surgical Sciences, University of Turin Dental School, Turin, Italy.
| | - Camilla Alovisi
- Department of Surgical Sciences, University of Turin Eye Clinic, Turin, Italy
| | - Allegra Comba
- Department of Surgical Sciences, University of Turin Dental School, Turin, Italy
| | - Gabriele Ventura
- Department of Surgical Sciences, University of Turin Dental School, Turin, Italy
| | - Damiano Pasqualini
- Department of Surgical Sciences, University of Turin Dental School, Turin, Italy
| | - Federico Grignolo
- Department of Surgical Sciences, University of Turin Eye Clinic, Turin, Italy
| | - Elio Berutti
- Department of Surgical Sciences, University of Turin Dental School, Turin, Italy
| |
Collapse
|
11
|
Takemura Y, Hanaoka K, Kawamata R, Sakurai T, Teranaka T. Three-dimensional X-ray micro-computed tomography analysis of polymerization shrinkage vectors in flowable composite. Dent Mater J 2014; 33:476-83. [PMID: 24988881 DOI: 10.4012/dmj.2013-288] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The polymerization shrinkage of flowable resin composites was evaluated using air bubbles as traceable markers. Three different surface treatments i.e. an adhesive silane coupling agent, a separating silane coupling agent, and a combination of both, were applied to standard cavities. Before and after polymerization, X-ray micro-computed tomography images were recorded. Their superimposition and comparison allowed position changes of the markers to be visualized as vectors. The movement of the markers in the resin composite was, therefore, quantitatively evaluated from the tomographic images. Adhesion was found to significantly influence shrinkage patterns. The method used here could be employed to visualize shrinkage vectors and shrinkage volume.
Collapse
Affiliation(s)
- Yukihiko Takemura
- Department of Cariology and Restorative Dentistry, Graduate School of Dentistry, Kanagawa Dental University
| | | | | | | | | |
Collapse
|
12
|
Sánchez-Ayala A, Farias-Neto A, Vilanova LSR, Gomes JC, Gomes OMM. Marginal microleakage of class V resin-based composite restorations bonded with six one-step self-etch systems. Braz Oral Res 2013; 27:225-30. [DOI: 10.1590/s1806-83242013000300003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2012] [Accepted: 02/08/2013] [Indexed: 11/22/2022] Open
|
13
|
Bakhsh TA, Sadr A, Shimada Y, Mandurah MM, Hariri I, Alsayed EZ, Tagami J, Sumi Y. Concurrent evaluation of composite internal adaptation and bond strength in a class-I cavity. J Dent 2012; 41:60-70. [PMID: 23044389 DOI: 10.1016/j.jdent.2012.10.003] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2012] [Revised: 09/29/2012] [Accepted: 10/02/2012] [Indexed: 10/27/2022] Open
Abstract
OBJECTIVES This study investigated class-I cavity floor adaptation by swept-source optical coherence tomography (OCT) in combination with microtensile bond strength (MTBS) using different filling methods. METHODS Two adhesive systems; Tokuyama Bond Force and Tri-S Bond Plus were used in conjunction with a universal composite (Estelite Sigma Quick) placed either incrementally (oblique) or in bulk with or without a flowable composite lining (Palfique Estelite LV). Ten serial B-scan images were obtained throughout each cavity by OCT (center wavelength: 1319nm). In order to evaluate adaptation defined as the cavity floor percentage showing no gap, a significant increase in the signal intensity was considered as gap at the bonded interface of the cavity floor. The same specimens were then cut into beams to measure MTBS at the cavity floor. RESULTS Two-way ANOVA demonstrated that the interaction of adhesive systems and filling techniques was significantly affecting both adaptation and MTBS (p<0.05). There was a significant correlation between MTBS and adaptation at cavity floor (p<0.05). Cavity floor adaptation and MTBS were improved when incremental filling technique was applied, while the outcome of lining technique was variable. CONCLUSIONS Quantitative assessment by OCT can non-destructively provide information on the performance and effectiveness of dental composites and restoration techniques. There was a moderate correlation between floor adaptation and bond strength in class-I cavities. Incremental application of composite restoration showed the best performance in terms of bond strength and internal adaptation. CLINICAL SIGNIFICANCE Incremental application of composite restoration was the most advantageous placement technique in terms of bond strength and internal adaptation. The lack of placement pressure with flowable composites may affect their adaptation to all-in-one adhesives; therefore, the outcome of cavity lining by flowable composite was variable.
Collapse
Affiliation(s)
- Turki A Bakhsh
- Cariology and Operative Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia; Cariology and Operative Dentistry, Tokyo Medical and Dental University, Tokyo, Japan
| | | | | | | | | | | | | | | |
Collapse
|