Resin Restorations Research Articles

Patterns of Post-Endodontic Restoration: A Nationwide Survey of Dentists in Turkey.

Developments in materials and techniques, geographical locations, age, specialty, and affiliations of dental practitioners affect the preference of post-endodontic restoration. Thus, this survey aimed to evaluate the trends of dentists in Turkey in terms of post-endodontic restorations. An anonymous survey containing 10 questions regarding demographics, post-endodontic restoration patterns, and factors affecting restoration selection was electronically delivered to the dentists registered in the database of the Turkish Dental Association. The data were analyzed using by a chi-square test and ordinal logistic regression analysis. A total of 1093 surveys from 20,564 participants were collected with a response rate of 5.3%. Half of the participants (52%) preferred composite resins for post-endodontic restorations. Usage of posts was less prevalent amongst prosthodontists and dentists with clinical experience of more than 20 years compared to endodontists (p < 0.001) and dentists with clinical experience of less than 5 years (p = 0.004). More than half of the participants (56%) utilized fiber posts. Composite resins and fiber posts were the most common preferences in post-endodontic restoration. Endodontists had a higher tendency to use posts than prosthodontists and general dental practitioners.

Onset of oral lichen planus following dental treatments: A nested case-control study.

The exposure to amalgam restorations has been reported to bring about altered immunity followed by inflammation and infection. This study aimed at identifying whether patients who received restorative or endodontic treatments, or tooth extraction, would have altered odds of developing oral lichen planus (OLP). In this population-based nested case-control study, 421 cases of OLP and 1,684 controls were included after propensity score matching. Logistic regression was used to estimate the adjusted odds ratio (aOR) of OLP in individuals who had received amalgam and composite resin restorations, root canal therapy, and tooth extraction over a follow-up duration of five years. There were no significantly different odds of OLP for those who underwent either amalgam (aOR = 0.948, 95% CI = 0.853-1.053, p = 0.3170) or resin restorations (aOR = 1.007, 95% CI = 0.978-1.037, p = 0.6557) in both anterior and posterior teeth in an observational period of five years after restorations. Root canal therapy was associated with significantly lower odds of OLP, with each additional root canal therapy attenuating the risk of OLP at an aOR of 0.771 (95% CI = 0.680-0.874, p = 0.0001) for both anterior (aOR = 0.786, 95% CI = 0.626-0.986, p = 0.0372) and posterior teeth (aOR = 0.762, 95% CI = 0.650-0.893, p = 0.0008). Likewise, each tooth extraction reduced the risk of OLP, with an aOR of 0.846 (95% CI = 0.772-0.927, p = 0.0003), especially for anterior teeth (aOR = 0.733, 95% CI = 0.595-0.904, p = 0.0037). We reported no significant association between dental restorations and consequent OLP, and significantly lower odds of OLP following both root canal therapy and tooth extraction.

Evaluation of Flexural Strength of Autopolymerizing Polymethyl Methacrylate and Bis-acrylic Composite Provisional Restorative Resins Reinforced with Bamboo Fibers: An In Vitro Study

Evaluation of Flexural Strength of Autopolymerizing Polymethyl Methacrylate and Bis-acrylic Composite Provisional Restorative Resins Reinforced with Bamboo Fibers: An In Vitro Study

A water-soluble glass-based temporary restorative resin inhibited bacteria-induced pH reductions at the bacteria-material interface

This study aimed to evaluate the inhibitory effects of a water-soluble glass based temporary restorative resin (WSG-TRR) on bacteria-induced pH reductions at the bacteria-material interface. Each material (WSG-TRR, glass-ionomer cement, resin composite and conventional temporary restorative resin) was fixed to the bottom of the well of the experimental apparatus. The well was filled with pelleted cells of Streptococcus mutans, and the pH at the bacteria-material interface was monitored using a miniature pH electrode. The concentration of ions released from WSG-TRR and the effect of fluoride and zinc ions on bacteria-induced pH reduction was evaluated. The buffering capacities of WSG-TRR and WSG were also evaluated. At 90 min after the glucose addition, WSG-TRR exhibited the highest pH (5.29±0.12). Fluoride ion was detected at the interface between bacteria and WSG-TRR. Moreover, WSG were found to confer high buffering capacity. A WSG-TRR reduced bacteria-induced pH reductions at the bacteria-material interface.

Is the clinical performance of composite resin restorations in posterior teeth similar if restored with incremental or bulk-filling techniques? A systematic review and meta-analysis.

A systematic review was performed to analyze the clinical performance of class I and II restorations in posterior teeth placed with the incremental or the bulk-filling techniques. The primary outcome was retention/fracture rate, and the secondary outcomes evaluated were anatomical form, surface texture, color match, marginal adaption, marginal discoloration, caries, and postoperative sensitivity. Electronic and manual searches were performed for randomized clinical trials comparing the clinical performance of composite resin restorations in posterior teeth placed with the incremental or the bulk-filling techniques. The Cochrane Collaboration risk of bias tool was used to assess the quality of the studies and the GRADE tool was used to access the quality of the evidence. Fourteen studies were included in this systematic review and most of them had unclear risk of bias. The risk difference (RD) for retention/fracture was 0.00 (95%CI = - 0.01, 0.01; p = 0.86) for 1-1.5years of follow-up; 0.00 (95%CI = - 0.02, 0.02; p = 0.88) for 2-3years of follow-up; 0.05 (95%CI = - 0.08, 0.18; p = 0.46) for 5 or more years of follow-up. The RD for postoperative sensitivity was 0.04 (95%CI = - 0.02, 0.10; p = 0.18) for up to 30days; 0.00 (95%CI = - 0.01, 0.02; p = 0.63) for 1-1.5years of follow-up; and 0.00 (95%CI = - 0.01, 0.02; p = 0.71) for 2-3years of follow-up. For the other secondary outcomes, no significant differences were observed (p > 0.05) between the restorative techniques. The certainty of evidence was graded as moderate. The clinical performance of class I and II restorations in posterior teeth is similar when placed with the incremental and bulk-filling techniques. Based on the results of this study, posterior restorations placed with bulk-filling technique present satisfactory clinical performance, which is similar to direct restorations placed with the conventional incremental technique, considering various follow-up periods evaluated. CRD42018108450.

Operators' Ease and Satisfaction in Restoring Class II Cavities With Sectional Matrix Versus Circumferential Matrix System at Qassim University Dental Clinics.

Objectives: This study aimed to investigate the operator’s ease, satisfaction, and comfort of using a circumferential matrix system and sectional matrix system on the proximal contact points and contours when restoring class II cavities in posterior teeth.Materials and methods: This cross-sectional study was performed at the clinics in the Department of Conservative Dental Sciences, College of Dentistry, Qassim University. A total of 105 dental students randomly participated in this study to restore a class II cavity with direct composite resin restoration. Operators' comfort and satisfaction were evaluated according to their assessment of the contact points they reproduced and the emergence profiles of restorations, using a circumferential matrix system and sectional matrix system.Results: Out of 105 operators, 57 were satisfied with using circumferential matrix bands for most of their cases while 78 of the operators were satisfied with sectional matrix bands. There were no significant differences between operator satisfaction and the use of circumferential matrix band system (P > 0.05) and sectional matrix band system (P = 0.134) but there was a significant difference between difficulty levels in the use of both matrix band systems (P < 0.05; P = 0.000).Conclusion: Circumferential and sectional matrix band systems showed no significant differences with operators' satisfaction during restoring class II cavities in posterior teeth but using a sectional matrix band system was considered easier than using a circumferential matrix band system.

Maxillary lateral incisor agenesis and microdontia: Minimally invasive symmetric and asymmetric esthetic rehabilitation

Maxillary lateral incisor agenesis is a condition that significantly compromises smile esthetics, which is particularly worrying in young patients. This article shows how the combination of non-invasive treatments and current restorative options may improve clinical outcomes following orthodontic treatment for symmetric and asymmetric maxillary lateral incisor agenesis and microdontia. Teeth were treated with conservative resin restorations in three separate cases: two of congenitally missing maxillary lateral incisors (i.e., unilateral and bilateral) and one of microdontia. After presenting the clinical results, this article summarizes how bleaching, enameloplasty, and bonding with composite resin can enhance esthetics and functions following orthodontic space closure. The cases reveal that carefully planned, methodically executed orthodontic and restorative approaches can achieve predictable, esthetic outcomes that will improve the patient’s self-esteem with a minimally invasive solution.

Study of microleakage in dental enamel using nanofillers composite resin restoration with total-etch and self-etch adhesive

Microleakage is a poor marginal adaptation of the restoration, often found between cavity and restoration material. One of the reasons is the shrinkage during the composite resin during polymerization, causing the restoration’s adaption disturbed. Application of adhesive material on the cavity affects microleakage at the margin restoration and increases the adaptation between cavity and restoration material. This research aims to determine microleakage in dental enamel using nanofiller composite resin restoration with fifth-generation total-etch adhesive and eight-generation self-etch adhesive. This research used 16 specimens premolars, which were prepared cavity Class I G.V. Black and divided into two groups (group A and B). Group A used nanofiller composite resin FiltekTM Z350 + fifth-generation total-etch Adper Single Bond 2 (n=8), group B used nanofiller composite resin Filtek TM Z350 + eight-generation self-etch Universal Single Bond Adper (n=8). The specimen isolated using nail polish except in the work area.,then immersed in methylene blue 1% at 25°C (for 24 hours). After that, all specimens were washed and cut longitudinally. The results were observed using a Stereomicroscope and Scanning Electron Microscope (SEM). The observation’s results showed that the amount number of microleakage in group A (75%) less than in group B (100%), while the non-parametric statistic test using the Mann Whitney showed no significant differences (p0.143). Based on SEM images, the average distance between enamel and composite resin with total-etch adhesive was 1.40 ± 0.007µm, and 1.84 ± 0.509 µm for resin composite with self-etch adhesive. This research concluded that microleakage using nanofiller composite with the fifth-generation total-etch adhesive was smaller than nanofiller composite resin with the eighth -generation self-etch adhesive.KEYWORDS: Adhesive system, nanofillers composite resin, microleakage, enamel

Evaluation of Microleakage at the Junction Between Combined Amalgam/Composite Resin Restorations Using Different Bonding Systems in Class II Cavities

Evaluation of Microleakage at the Junction Between Combined Amalgam/Composite Resin Restorations Using Different Bonding Systems in Class II Cavities

Uma abordagem conservadora para reabilitar um caso de hipomineralização molar-incisivo

ABSTRACT Molar incisor hypomineralization is an increasingly common condition in our population. This condition can have great impact on the esthetics, function, and well-being of the child. This paper reports a case of a young patient diagnosed with this condition affecting all the first permanent molars and lower incisors, particularly teeth 31 and 41. The molars were treated with direct resin restorations with cusp coating and the incisors aesthetic was restored with different techniques such as bleaching with sodium hypochlorite, micro-abrasion and resin restorations. This treatment plan aimed to restore the proper teeth function, treat the already existing hypersensitivity and algic complains and to improve the aesthetic of the anterior sector. The presented case shows a conservative approach to deal with the molar incisor hypomineralization condition with satisfactory results after 1-year follow-up.

Reabilitação estético-funcional em dentes anteriores decíduos sem remoção de tecido cariado: série de casos clínicos

ABSTRACT The treatment of cavity carious lesions in anterior deciduous teeth is a frequent demand in the pediatric dentistry clinic, since the control of the disease in early childhood still presents itself as an inter-factor challenge in child health care. While the scientific evidence on the minimally invasive principles of approach in Dentistry is presented at an increasing level, the alternatives for restorative treatment in anterior deciduous teeth still face the low availability of reports that associate minimal intervention with the aesthetic needs inherent to the treatment. Thus, this article presents a series of cases in which direct restorations in composite resin, without removing carious tissue using polyvinyl matrices, were treatment alternatives for moderate and severe caries lesions in anterior deciduous teeth. It was observed, therefore, that the use of this artifact helped the rehabilitation of compromised dental elements with speed and satisfactory 50 result, suggesting that this is an appropriate approach for application in Pediatric Dentistry, 51 since it offers resistance, durability, besides providing aesthetics and functionality, it presents lower cost and agility as it eliminates the laboratory phase.

Effect of Build Orientation in Accuracy, Flexural Modulus, Flexural Strength, and Microhardness of 3d-Printed Resins for Provisional Restorations

Effect of Build Orientation in Accuracy, Flexural Modulus, Flexural Strength, and Microhardness of 3d-Printed Resins for Provisional Restorations

Comparison of Microleakage of Composite and Glass Ionomer Restorations in Primary Molars Pretreated with Silver Diamine Fluoride at Two Time Intervals: An In Vitro study

Introduction: We aimed to evaluate the microleakage of composite resin and self-cure glass ionomer (GI) restorations in primary molars when the restorations were applied at the same day of silver diamine fluoride (SDF) treatment, and after 14 days. Methods: Class V cavities made at the buccal surface of 64 deciduous molars. For the experimental group of 32 teeth treated with SDF (eight teeth filled with composite and eight teeth filled with GI after 1 day and 14 days), the remaining 32 teeth without application of SDF served as a control group. All samples were then thermocycled and immersed in 2% methylene before being molded in epoxy resin to facilitate cutting into two sections. The dye penetration was then measured using a stereomicroscope at 20× magnification. Results: Overall model test showed statistical significant difference among study groups (P < 0.001). Post hoc test showed significant difference for usage of silver diamine fluoride (P < 0.001) and non-significant differences for type of restoration (P = 0.21) and time (P = 0.43). Conclusion: There was a significant reduction in microleakage following the usage of SDF before restoration over time.

A Study of Plaque Adhesion during Implant Treatment of Missing Molars

Purpose: In implant treatment, the abutments and superstructures form a transmucosal area. In addition to providing appropriate cleaning instructions to patients, its material properties must be carefully considered. It is not clear how much plaque adhesion occurs at each site during treatment process, and the effect of materials on plaque adhesion. Methods: In this study, 33 patients, 13 maxillary cases and 20 mandibular cases, who had implants placed in the missing molars were evaluated for the plaque adhesion of provisional restorations made of acrylic resin and monolithic zirconia final restoration after a period of more than 4 weeks. In addition, oral hygiene instructions were thoroughly given for 12 cases at the time of staining after the provisional restorations, and re-evaluated in 4 weeks. Results: About 20% of the buccal-lingual area of the prosthetic device fabricated with acrylic resin showed plaque staining, whereas about 40% of the area of the mesial and distal. On the other hand, for the zirconia final restorations, the percentage of staining was about 5% for buccal and lingual surface and 10% for mesial and distal surface. The stained area ratio of the provisional restoration correlated with the zirconia superstructure area ratio. Even with careful oral hygiene, it became clear that the amount of plaque adhesion due to the difference in materials could not be overcome. Conclusion: The zirconia superstructure is extremely good from the viewpoint of plaque adhesion, but cases with a large stained area at the time of provisional restoration should be carefully followed up.

Composite resin restoration: A conservative approach to esthetic dentistry

Composite resins have been advocated for decades as a means to conservatively restore minor, moderate and even large defects in teeth caused by decay or trauma. Their indication is predicated on the need to preserve as much healthy tooth structure as possible while using the synthetic composite resin materials to completely replace and augment lost to its structure by adhesive dentistry. Composite resins are tooth-colored materials that can be applied to the remaining surfaces of teeth to replace lost tooth structure in such a way as to actually make them one, blending and exactly matching the physical characteristics and color of natural teeth, and strengthening them in the process.Modern composites physically adhere by actually bonding to the two elements that teeth are composed of, dentine and enamel. Major advances have resulted from the study and understanding of how the crowns of teeth actually flex or give under biting force and how restorative materials can be used to the greatest effect in the way they interact. Composites can be used to restore teeth directly—they are applied directly to the teeth in the dental office in a single appointment. These are considerable improvements both from medical/biological aspect as well as social/economic aspect as these newer materials are more conservative and cheaper.Three cases have been presented in this paper to highlight the advantages of composite resins. The objective of the paper is to show how tooth restoration can be done with minimum tooth preparation.

Treatments Performed on First Permanent Molars in a Sample of Lebanese Children: A Five-Year Retrospective Analysis.

Background:Dental caries remains one of the most prevalent worldwide chronic diseases and an expensive burden to healthcare services despite significant preventative measures Objective: Dental caries is a multifactorial chronic disease that occurs in early childhood and persists until adulthood. The first permanent molars (FPMs) are the earliest permanent molars to erupt what makes them vulnerable to caries among children and adolescents. Objective: The aim of this study is to determine the prevalence of different types of treatments performed on FPMs in 7–10-year-old Lebanese patients. Methods: In this retrospective study, a convenience sample obtained from the dental electronic health record system of 753 patients, aged between 7 and 10 years old who attended the department of Pediatric Dentistry at the Faculty of Dental Medicine–Lebanese University, between 2015 and 2019 was assessed. Preventive procedures (fissure sealants and preventive resin restorations) as well as therapeutic ones (apexogenesis, composite restoration, extraction, pulp capping, radicular treatment, pulpotomy, stainless steel crown, surgery and emergency) were investigated. Data collected was statistically analyzed using SPSS version 25.0 (Armonk, NY: IBM Corp).Results:The 753 patients were divided into 364 girls (48.3%) and 389 boys (51.7%). These patients underwent a total of 2145 procedures. Procedures were equally divided between therapeutic procedures and preventive ones (51.6% versus 48.4%, respectively). The most commonly performed procedure was composite restoration (41.9%), followed by fissure sealant (34.5%) and preventive resin restorations (14%). Treatments corresponded to a similar sex distribution with slightly higher male patients (53.6%). No statistical association was found between sex and procedure type (p=0.7).Conclusion:In the present study, therapeutic treatments prevalence is relatively high. Thus, educating the parents and teachers on the importance of FPMs would reflect in increased preventive treatments at the expense of decreased therapeutic ones.

Reposicionamento coronal do retalho para recobrimento de recessões gengivais múltiplas utilizando matriz de colágeno tridimensional associada às proteínas derivadas da matriz do esmalte – série de casos

Gingival recession is the generic term that means exposure of the teeth root surface. It can cause aesthetic problems, dentin hypersensitivity or even favor the appearance of root caries. Depending on the patients complaint, it can be treated in different ways, such as through direct resin restorations, root desensitization or even surgical root coverage. The latter can be obtained through coronal/lateral repositioning of the flap with or without a connective tissue graft. Currently, the removal of subepithelial connective tissue graft from the patients palate be replaced by 3D collagen matrices, generating satisfactory aesthetic results. The aim of this case series was to evaluate the evolution of root coverage treatment using the protocol for covering multiple gingival recessions with the association of soft tissue substitute and enamel matrix-derivative proteins. Seven systemic healthy adult patients complaining of root exposure sought at our clinic. Coronal flap repositioning associated with soft tissue substitute and enamel matrix-derivative proteins was proposed. All patients were treated with the same surgical technique. At the end of 30 months postoperatively, the patients self-reported satisfactory results, with root coverage close to 85% and total coverage in 50% of the treated teeth, with no complaints of pain, considerable edema and/or hemorrhage in the immediate postoperative period. This protocol used seems to obtain satisfactory results regarding aesthetic complaints or dentin hypersensitivity reported by patients at the beginning of treatment.

Comparative Evaluation of Microshear Bond Strength of Adhesive Resin Incorporated with Inorganic Nanofillers Cerium Dioxide: An In-vitro Study

Introduction: Dental adhesives are used for a wide range of clinical applications in dentistry. Bonding is required in direct composite resin restorations. In clinical situation, resin to dentin bonds are less resistant than resin to enamel bonds. Because of varying structure and composition of dentin the failure of resin-dentin bonding resulting in staining, caries recurrence microleakage. These set of circumstances can hasten the failure and degradation of resin to dentin bonding hence inorganic fillers can be added to improve the bond strength. Cerium dioxide (CeO2 ) is a rare earth oxide has been increasingly used as a nanotherapeutic material and can be successfully used in adhesive resin to improve the physical properties of adhesive resin. Aim: To evaluate and compare microshear bond strength of adhesive resin after incorporation of inorganic nanofillers cerium dioxide. Materials and Methods: This in-vitro study was conducted in Department of Preventive and Paediatric Dentistry at School of Dental Sciences, Krishna Institute of Medical Sciences, Karad, Maharashtra, India, from February 2022 to April 2022. The unfilled dental adhesive was used as a control (group A) and dental adhesives formulated with nanosized Cerium dioxide (CeO2 ) as the inorganic filler (group B). Total 24 samples were prepared 12 samples each group and adhesives were evaluated for microshear bond strength. Intragroup comparison between experimental and control group was done using Unpaired t-test. Results: The mean microshear bond strength of the adhesive system containing nanosized cerium dioxide at a concentration of 2% was 6.89±2.22 MPa (group B), which was significantly greater than that of the adhesive system without additives (group A) 4.37±1.22 MPa. Conclusion: Microshear bond strength of the dental adhesives with nanosized CeO2 particles, was significantly higher than the unfilled adhesive.

The Effect Of Different Polymerization Procedures On Color Stability Of Indirect Resin Restorations

The Effect Of Different Polymerization Procedures On Color Stability Of Indirect Resin Restorations

42 - Fatigue Resistance of CAD/CAM and 3D-Printing Provisional Restorations

3D-printed provisional restorations can be fabricated using additive manufacturing (AM) technologies. However, little information about their performance is available. The aim of this study was to compare the fatigue resistance of 3-teeth provisional resin restorations obtained by 3D printing with those made from polymethylmethacrylate (PMMA) blocks using a CAD/CAM system. A titanium master model for 3-teeth fixed dental prostheses (FDPs) (abutment teeth 45 and 47) was prepared. The master model was scanned and 14 provisional FDPs were produced using respectively: group 1 (N=7): CAD/CAM + BreCAM HIPC-Bredent (BH); group 2 (N=7): 3D printing + NextDent (ND). The FDPs were cemented on the titanium master model with a provisional cement (Temp Bond, Kerr) and submitted to a 5-step incremental cyclic isometric loading: step 1: 5.000 cycles at 10 Hz with 200 N compressive load; steps 2 to 5: 30.000 cycles at 3 Hz with a compressive load respectively of 400 N, 600 N, 800 N and 950 N. Group 1 and 2 were compared using the life table survival analysis and t-test. In group 1 (BH), only 5 specimens endured the entire fatigue process, while 2 specimens failed at 950 N. In group 2 (ND), 1 specimen failed at 400 N, 5 specimens (ND) failed at 600 N) and 1 specimen failed at 800 N. PMMA CAD/CAM provisional FDPs showed higher fatigue resistance when compared to the ones made via 3D printing.