International Journal of Dental Materials
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Evaluation of effect of core build-up materials on fracture resistance of endodontically treated teeth: Fracture resistance of core build-up materials
No full textBackground: Restoration of teeth after endodontic treatment is becoming an integral part of reconstructive dentistry.
Aim: The aim of this study was to evaluate the effect of different core build-up materials on fracture resistance of endodontically treated teeth.
Materials and methods: Freshly extracted forty permanent mandibular first molars were selected. Standardized access cavities were prepared, following which mesial canals were prepared up to F2 (8%25) and distal canals up to F3 (9%30) and obturated. The coronal portion of the specimen was altered by removing the mesial wall and retaining buccal, lingual and mesial walls of 2mm and distal 5mm girth. Ten specimens each were rehabilitated with high copper amalgam, type IX GIC, posterior composite and Alkasite as core build-ups. All the specimens were finally rehabilitated with a metal crown. The specimens were tested for fracture resistance using a universal testing machine under oblique (135o to the long axis of teeth) cyclic loading. The number of cycles taken to fracture and the fracture site was recorded. The results of mechanical cyclic loading to evaluate fracture resistance showed that composite core endured the maximum number of cycles to fracture followed by amalgam, Alkasite and type IX GIC.
To test the statistical significance of the difference in mean value KIC among four groups, Kruskal-Wallis one-way analysis of variance was applied. Bonferroni’s multiple comparison test was performed to determine which group significantly differed from the others.
Results: From the results of this study, the composite was considered to be the best core build-up material. The newer material, Alkasite can bear stress almost to that of amalgam restoration.
Conclusion: This study suggests that Alkasite could be used as a core material for restoring the endodontically treated teeth
Prosthetic management of severely resorbed mandibular ridge using neutral zone technique in complete dentures: a case report
Get PDFAny prosthodontic procedure aims to restore a patient\u27s function, contours, aesthetics, speech, and health to normal. In traditional complete dentures, achieving optimal denture stability is always found to be a challenge. This is often exacerbated in resorbed mandibular ridges. Therefore, this article describes a strategy for enhancing the retention of mandibular complete dentures for individuals with an extremely resorbed ridge. A patient reported to the department of prosthodontics with a chief complaint of loose dentures and wanted to get them replaced. A complete clinical examination was carried out which revealed severely resorbed mandibular ridge. After a complete evaluation, prosthetic rehabilitation with a complete denture using the neutral zone technique was panned. The complete denture was made and delivered to the patient was superior in terms of stability, function and aesthetics. The clinician should understand the advantages of the neutral zone technique and implement it in clinical practice so that a prosthesis that is functionally, physiologically and psychologically acceptable to the patient can be delivered
Aesthetic and Functional Full Mouth Rehabilitation of a Patient Using Extra Coronal Attachments: a case report
Get PDFAchieving aesthetic and functional requirements in full mouth rehabilitation using combined fixed and removable dentures is difficult. Strategic diagnosis and treatment planning are required to overcome this challenge. Numerous conventional and cutting-edge treatments can result in successful restorations. One such method of treatment is precision attachment retained partial dentures. Selecting strategic abutments is key to the success of the partial denture. This case report describes full-mouth rehabilitation of maxillary and mandibular arches using fixed and attachment retained cast partial dentures
Comparative evaluation of remaining dentin thickness with three different rotary Ni-Ti File systems: an in vitro CBCT study
Get PDFBackground: Endodontic therapy and its success depend on effective cleaning and shaping the root canal without deviating from the original anatomy. Ideally, during root canal preparation, the instruments should always confine to and retain the original shape of the canal to maximize the cleaning effectiveness and minimize unnecessary weakening of tooth structure to achieve the optimal result. The remaining dentin thickness in endodontically treated teeth is a significant factor, which is responsible for its longevity.
Aim: This study aimed to evaluate the remaining dentin thickness after instrumentation with ProTaper Next (PTN), TruNatomy (TN), and Neohybrid (NH) file systems using cone-beam computed tomography.
Materials and methods: Thirty extracted single-rooted mandibular premolars were decoronated and divided into three experimental groups with ten in each. Groups I, II, and III were assigned to the file systems ProTaper Next (PTN), TruNatomy (TN), and Neohybrid (NH), respectively. Cone-beam computed tomographic pre-scans were taken, followed by the biomechanical preparation with the respective file systems. Post CBCT scans were taken and compared with pre-scans for remaining dentin thickness. The data obtained were statistically analyzed.
Results: Among the three file systems, TruNatomy rotary files resulted in significantly less dentin removal (p<0.05). The majority of the intergroup comparisons showed significant differences in remaining dentin thickness after biomechanical preparation at 3, 6, and 9mm.
Conclusion: TruNatomy (TN) exhibited the maximum remaining dentin thickness followed by Neohybrid (NH) and comparatively minimum with ProTaper Next (PTN) file systems
Prosthodontic rehabilitation of a mucormycosis patient: a case report
Get PDFMaxillofacial defects can result from congenital disabilities, cancer surgery, trauma, infection, or disease. Facial deformities can affect how a person looks, feels about themselves, and interacts with others. It can significantly impair phonetics, mastication, and deglutition and cause facial deformation. Maxillectomy due to mucormycosis is one such maxillofacial defect and it becomes essential to rehabilitate these cases with modified techniques based on the extension of intraoral defect, the severity, the degree of resection, the type of mucormycosis, the stability of lesions over time, the presence of contiguous disease, the accessibility of dental and prosthetic resources, and patient expectations. The prosthetic reconstruction with a maxillofacial prosthesis can restore function and appearance, comfort, and quality of life. The prosthesis should be simple to handle, easy to maintain, biocompatible, light in weight, and convenient for future adjustments. The maxillofacial surgeon, oncologist, and reconstructive dentist should work together to develop a treatment plan based on these considerations. This case report provides the current treatment options for these patients and rehabilitation of the defect. It also discusses the issues that need to be addressed during the planning of prosthetic treatment and highlights some challenges the clinicians face in providing prosthetic treatment for mucormycosis patients
Resin-bonded fixed partial denture as a cost-effective prosthesis for missing maxillary lateral incisor in a cleft lip and palate patient: a case report
Get PDFLiterature suggests 66.7% of dental abnormalities among patients with cleft lip and palate (CLP). Besides posing functional difficulties, dental anomalies also raise significant aesthetic concerns among these patients, especially with missing teeth in the anterior region. Among various treatment choices like a removable partial denture, fixed and implant treatments available in the prosthetic rehabilitation of missing teeth in CLP subjects, Maryland bridges offer a conservative and cost-effective alternative in short-span edentulous spaces while carrying the advantages of supragingival marginal preparations and less intensive working times. The availability of advanced self-etch adhesive systems that chemically bond to both the tooth and metal surfaces offer these prostheses more longevity. This case report presents the fabrication of a resin-bonded fixed partial denture in the prosthetic rehabilitation of a missing maxillary lateral incisor in a 23-year-old female patient with CLP who was unwilling for orthodontic care
An analogy between maxillary anterior teeth dimensions measured using facial proportions and Chu proportion gauge: an in vivo study: An analogy between maxillary anterior teeth dimensions
No full textBackground: A fine balancing of geometric concepts and artistic abilities is required while designing smiles. One of the key elements that make up the smile frame is tooth size. The maxillary front teeth are the most noticeable in the smile arch, therefore choosing the right tooth size and positioning it in the maxilla improves both aesthetics and treatment outcomes.
Aim: This study aimed to compare the dimensions of maxillary anterior teeth measured with vernier callipers and CHU proportion gauge with facial proportions such as intercanthal distance, interalar width and bizygomatic width.
Materials and Methods: On a sample of 100, Facial proportions, mesiodistal width, and height of maxillary anterior teeth were recorded using digital callipers and a Chu proportion gauge. The recorded data were subjected to statistical analysis. Mean comparisons of each width were done using a t-test, ANOVA and Tukey’s Post-hoc test considering a p-value less than 0.05 to be statistically significant.
Results: Mean values of the combined width of anteriors calculated using Chu gauge was 45.08, and that calculated using Vernier Callipers was 45.85. Multiplying the factor 1.47 to Inner canthal width and 1.42 to Interalar width results in the combined width of the maxillary anterior teeth. A mean difference of 0.02620 ± 0.91777 and 0.4988 ± 0.91777 exists between Inner canthal and Combined Chu’s width with a 0.04% and 0.34% error in younger and elder age populations, respectively. A mean difference of -11.4775 ± 0.91777 and -11.6039 ± 0.91777 exists between Combined mesiodistal width obtained by using Chu’s width and bizygomatic width with a 0.01% error in younger and elder age populations, respectively.
Conclusions: This study reported a negligible 0.7 difference in the means of the combined width of anteriors calculated using Chu gauge and Vernier Callipers. Hence, these two methods can be used as alternatives to calculate the width of anterior teeth
Solubility of glass ionomer cement in various acidic beverages at different time intervals: an in vitro study
Get PDFBackground: Glass Ionomer is a widely used cement in dentistry for luting and restoration purposes. This cement leaches a large amount of fluoride ions leading to an increase in the early solubility and disintegration in the oral fluids. The solubility of the cement is further aggravated when it is exposed to an acidic medium.
Aim: This study aimed to evaluate the solubility of glass ionomer cement (GIC) in various acidic beverages at different time intervals.
Materials and Methods: Four commercially available beverages and distilled water was used as immersion media. The pH of the beverages was measured using a digital pH meter. Glass ionomer cement discs were prepared and immersed in beverages for 1 day, 24 hours and 7 days. After completing the immersion time in each beverage for a specific period, the specimens were retrieved and weighed. The solubility was calculated by subtracting the weight at the specific immersion period from the initial weight of the specimen.
Results: Immersion in distilled water demonstrated less solubility compared to immersion in acidic beverages. Among the acidic beverages, GIC immersed in MAAZA showed the maximum solubility compared to the other beverages. One-Way ANOVA displayed a significant difference (p=0.000) among the beverages at different time intervals.
Conclusions: This study found that the GIC immersed in fruit juices with preservatives showed more solubility at all time intervals compared to the immersion in carbonated drinks
An overview of applications of PEEK polymer in prosthodontics.
Get PDFThe rapid evolution of computer-aided design and computer-aided manufacturing (CAD-CAM) led to the introduction of newer materials that could be precisely milled for the fabrication of dental prostheses. PEEK (PolyEtherEtherKetone) has been explored for a number of applications for clinical dentistry, including removable dental prostheses, fixed dental prostheses, implant-supported prostheses, resin-bonded fixed dental prostheses and implant-retained overdentures. The major beneficial property of PEEK is its lower Young\u27s modulus, and as elastic as bone, providing a cushioning effect and reduction of stress transferred to abutment teeth. It is a material with high biocompatibility, good mechanical properties, high-temperature resistance, chemical stability, polishability, good wear resistance, and high bond strength with luting cements. Further, PEEK is also recommended for a wide range of CAD-CAM fabricated fixed and removable prostheses, fabrication of occlusal splints, intra-radicular posts, implant abutments and provisional restorations. PEEK material shows a property of radiolucency, which is advantageous for the evaluation of both osseointegration and tissue surrounding the implant on computed tomography. Considering these properties, PEEK is increasingly being used in implantology
An overview of advances in glass ionomer cements
Get PDFGlass-ionomer dental cements (GICs) are aesthetic direct restorative materials with anticariogenic activity. Glass-ionomers are composed of alumino-silicate glass powder and poly acrylic acid liquid. The significant characteristics of GICs among restorative materials are their ability to bond to moist tooth structure without any pre-treatment and to provide a prolonged period of fluoride release, which prevents subsequent tooth decay (caries). These characteristics, along with the materials\u27 acceptable aesthetics and biocompatibility, make them popular and desirable for use in medical and dental applications. However, GICs exhibit poor mechanical qualities and moisture sensitivity. To improve their mechanical and physical qualities, the GIC powders have undergone extensive formulation and modification. This paper provides an overview of various fillers used to enhance the mechanical and physical properties of GICs