Acrylic Prosthesis Research Articles

Comparative clinical evaluation of the effectiveness of treatment of traumatic lesions of the oral mucosa

Relevance.Treatment of traumatic lesions of the oral mucosa in individuals who use removable acrylic dentures is a pressing problem in dentistry.The goalis a comparative assessment of the treatment of traumatic prosthetic stomatitis in patients using acrylic dentures with the use of various drugs for local use.Material and methods.A comparative clinical observation of the treatment of traumatic prosthetic stomatitis in 52 people aged 61 to 79 years, using removable acrylic prostheses, with the use of local adhesive Solcoseril® dental adhesive paste (1 group) and gum gel with propolis ASEPTA® (group 2 ). To ensure the comparability of the obtained results and their reliability, a semi-quantitative method was used for visual assessment of the effectiveness of treating traumatic prosthetic stomatitis, which was assigned to each of the symptoms observed in patients that indicate the absence or severity of clinical symptoms.The results of the study.Methods have been developed for determining the severity of traumatic prosthetic stomatitis and methods for assessing the effectiveness of its treatment, based on consideration of the most significant clinical symptoms of this pathology. It was established that on day 10 in group 1 of the study, the effectiveness of treatment was 82,1%, in group 2 – 81,17%.Findings.A high effcacy of selected agents for the local treatment of traumatic lesions of the oral mucosa of prosthetic etiology has been shown.

Effect of different fixed detachable implant supported prosthesis materials on the stresses induced on the supporting structures

Objectives: This study was conducted to evaluate the effect of different implant supported fixed detachable prosthesis materials (chrome cobalt-acrylic and BioHPP (Bio-High Performance Polyether)) on the stresses induced on the supporting structures.Materials and methods: A maxillary completely edentulous resin cast was 3d printed with four implant sites (two straight anterior implants and two tilted posterior implants), mucosal space for mucosa simulation and vertical slots for strain gauges which were 1mm distal to the two distal implants. Four implant analogues were placed in their sites. Multiunit abutments were secured to the implants, then fixed detachable prostheses were fabricated. In this study two models were conducted: Group (A): Complete implant supported chrome cobalt-acrylic fixed detachable prosthesis. Group (B): Complete implant supported BioHPP fixed detachable prosthesis. Strain gauges were supplied with fully encapsulated grids and attached wires. Micro strains were recorded at each site of the strain gauges with enough time elapsed between each testing. The applied load started from 0 up to 100N. T test was used for comparison between the groups, at a significance level of P ≤0.05. Results: Group A (chrome cobalt- acrylic prosthesis) showed higher induced stresses on supporting structures compared to group B (BioHPP) during bilateral, unilateral, and oblique loading. Independent T test showed statistically significant difference between the studied groups, P value was <0.05.Conclusion: Unilateral loading was more traumatic to the implants as compared to bilateral loading. BioHPP prosthesis has damping effect as it transferred less stresses to the supporting structures compared to chrome cobalt- acrylic prosthesis.

Biomechanical development and evaluation of a new framework for all-on-four rehabilitation

Abstract Introduction For complete rehabilitation of fully edentulous mandibles, the option for immediate loading determines the use of temporary prostheses that splint the installed implants. Although temporary prostheses with reinforcement provide rehabilitations with biomechanical benefits, the non-adoption of this recommendation coexists in different studies on immediate restorations. Objective This study evaluates a type of prosthesis to restore jaws by the all-on-four concept. Material and method: The mechanical behavior of prostheses with the modified framework was evaluated in vitro, under a cantilever mechanical unilateral bending test. Two representative groups were included in the all-on-four concept, with a G1 test group (n = 10) containing modified frameworks and a G2 control group (n = 10) that included full acrylic prostheses. The samples were submitted to thermal cycling with 500 cycles (5° ± 2 °C for 30 s, and 55° ± 2° for 30 s) and to the mechanical bending test on the cantilever. Result The Mann-Whitney test revealed a significant difference between G1 and G2 (p &lt;0.001). In the descriptive evaluation, G1 averaged 830.50 N until the initial resin fracture, while the control group presented a mean of 403.58N. The maximum resistance until complete fracture was recorded in G1, with a mean of 903.03N, while in G2, a mean of 435.20N was recorded. The linear vertical component of the flexion was 0.68 mm and 0.39 mm until the initial fracture of the bar, respectively for G1 and G2. Conclusion The modified framework for the all-on-four protocol determined better mechanical performance when compared to the same full acrylic prosthesis model.

CAD-CAM acrylic resin prosthesis superstructure: A technique for fabricating an implant-supported fixed complete denture

The implant-supported fixed complete denture is a common treatment option in implant prosthodontics but has shortcomings that include the high wear rate of the acrylic resin denture material and the displacement of denture teeth from the denture base. This report describes a method for fabricating implant-supported fixed dental prostheses using computer-aided design and computer-aided manufacturing technology.

Effect of Oil Paint Addition on Impact Strength of the Scleral Part of the Acrylic Ocular Prosthesis

Background: For many dental and facial restorations, acrylic resins are the materials of choice because of their appropriate physical and mechanical properties. When making the ocular prosthesis from such materials, it is essential to add the perfect shade in order to match the colour of normal eye. This, however, might have a significant effect on the mechanical properties of acrylic resins. Objective: The purpose of this study was to assess the effect of adding the white oil paint (titanium dioxide) to clear acrylic resins on their impact strength. Methods: 20 samples were constructed from heat cured acrylic resins, and divided into two groups (control and experimental) and each group had 10 samples. The first group was made from clear acrylic resin without the addition of white oil paints, and the second group (experimental) comprised the addition of 1 ml of the white oil paints to acrylic samples. Such samples were prepared with dimensions of (80 mm X10 mm X4 mm) length, width, and thickness, respectively. All the samples were tested by the Charpy's impact strength test. They were exposed to the load till the fracture occurred. All the values were analyzed using SPSS version 20, and the independent T-test was used for comparison between the 2 groups. Results: A statistically significant decrease (P-value &lt; 0.001) was found in the impact strength of acrylic resins after the addition of titanium dioxide oil paints (experimental group: 5.97 + 1.11, control group: 9.42+1.32 KJ/M2). Conclusion: This study concluded that the addition of titanium dioxide oil paint significantly reduces the impact of strength of the acrylic resin. It is suggested to use different stains which will have no negative effect on impact strength of the acrylic resin.

Conventional Approach for Fabrication of Orbital Prosthesis: A Case Report

Facial defect rehabilitation is a very critical task which requires personalized design of the prosthesis for each patient. Eyes are vital organ not only for vision but also for the facial expression. Disfigurement due to loss of an eye and associated structures may cause physical and psychological distress to the patient. Rehabilitating such patient with a removable orbital prosthesis is an economical and patient-friendly procedure which restores the patient's social as well as the cosmetic value. The present article describes a conventional technique for the fabrication of a spectacle retained acrylic resin orbital prosthesis providing accurate and effective rehabilitation. BJHS 2018;3(2)6:495-499.

Bond between single artificial teeth and the base plate in removable denture metal framework

Purpose: The purpose of this paper is to analyse attempts at improving the bond between acrylic artificial teeth and the denture base plate - considered in the context of single incisors in framework denture. Design/methodology/approach: It is a review article focusing on the analysis of state of the art in the field of the bond between the polymerised acrylic (teeth) and the polymerising acrylic resin during the production of denture (denture plate). Previous works regard the issue of individual incisor teeth (both upper and lower) breaking off from the metal partial denture. Findings: The bond between artificial acrylic teeth and the acrylic denture plate of the prosthesis was discussed. Ways of improving this bond were also presented. Although researchers and companies offer many methods for improving this bond, none of them refer directly to the issue discussed in this article. In conclusion- the hitherto scientific achievements work well in the case of acrylic prostheses without a metal frame, which constitutes an obstacle for achieving the effect required. In this work, it is suggested that further research would not only develop and provide more detail on the issue of the bond between artificial teeth and the denture plate, but also solve the problem appearing in cases of metal partial denture. Originality/value: This article shows a significant problem that hasn’t been discussed in detail in the past.

Resection of Large Ameloblastoma with Immediate Reconstruction: a Case Report

A 34-year-old woman attended the surgery service complaining of pain, dysphagia, dysphonia, and increased volume in the right hemiface since 10 years prior. Clinical examination showed a large bulge in the right mandibular region, with a firm consistency upon touching. Oral and lingual bulging caused protrusion of tongue. Dental dislocation and trauma to the lesion caused by the upper teeth were also observed. Imaging showed multilocular areas, bone expansion, and extension of the lesion to the contralateral molar region. Incisional biopsy was performed, and a diagnosis of multicystic ameloblastoma of plexiform pattern was made. The tumor was resected, and microscopic analysis confirmed the diagnosis. The patient underwent immediate reconstruction of the area using a customized acrylic resin prosthesis with a reconstruction plate of 2.4. Three months after surgery, the patient was free of painful symptomatology and was adequately rehabilitated with complete denture prosthodontics.

Short-term report of an ongoing prospective cohort study evaluating the outcome of full-arch implant-supported fixed hybrid polyetheretherketone-acrylic resin prostheses and the All-on-Four concept.

More research is needed on the study of new materials for fixed prosthetic implant-supported rehabilitations. The purpose of this study was to report the short-term outcome of full-arch implant-supported fixed hybrid polyetheretherketone (PEEK)-acrylic resin prostheses and the all-on-four concept. This prospective cohort clinical study included 37 patients (29 women, eight men) with an average age of 60 years (range: 38-78 years) with 49 full-arch hybrid PEEK-acrylic resin prosthesis supported by implants through the all-on-four concept. Primary outcome measures were prosthetic survival. Two patients with two maxillary prostheses were lost to follow-up. One patient with a double full-arch rehabilitation fractured the mandibular PEEK framework, rendering a 98% prosthetic survival rate. No implants were lost. The average (SD) marginal bone remodeling after 1 year of follow-up was 0.37 mm (0.58 mm). Technical complications concerning the veneer adhesion occurred in six patients and were resolved in all patients (with exception of the patient with prosthetic failure) through the creation of mechanical retentions and changing the bonding primer. Mechanical complications occurred in three patients and five prostheses consisting in prosthetic screw loosening (n = 2 patients) and fracture of the acrylic resin teeth (the patient with a prosthetic failure). Within the limitations of this study, the results suggest that hybrid polymer (PEEK)-acrylic resin prostheses supported by implants for full-arch rehabilitation may represent a valid treatment option, still requiring longer-term validation.

Comparative Histological and Histomorphometric Results of Six Biomaterials Used in Two-Stage Maxillary Sinus Augmentation Model after 6-Month Healing.

Objectives To evaluate the performances of six different bone substitute materials used as graft in maxillary sinus augmentation by means of histological and histomorphometric analysis of bone biopsies retrieved from human subjects after a 6-month healing period. Materials and Methods Six consecutive patients (3 males, 3 females, aged 50-72 years), healthy, nonsmokers, and with good oral hygiene, presenting edentulous posterior maxilla with a residual bone crest measuring ≤ 4 mm in vertical height and 3 to 5 mm in horizontal thickness at radiographic examination, were selected to receive sinus augmentation and delayed implant placement. Under randomized conditions, sinus augmentation procedures were carried out using mineralized solvent-dehydrated bone allograft (MCBA), freeze-dried mineralized bone allograft (FDBA), anorganic bovine bone (ABB), equine-derived bone (EB), synthetic micro-macroporous biphasic calcium-phosphate block consisting of 70% beta-tricalcium phosphate and 30% hydroxyapatite (HA-β-TCP 30/70), or bioapatite-collagen (BC). After 6 months, bone core biopsies were retrieved and 13 implants were placed. Bone samples were processed for histological and histomorphometric analysis. CT scans were taken before and after surgery. After 4 months of healing, patients were restored with a provisional fixed acrylic resin prosthesis, as well as after further 2-4 months with a definitive cemented zirconia or porcelain-fused-to-metal crowns. Results There were no postoperative complications or implant failures. The histological examination showed that all biomaterials were in close contact with newly formed bone, surrounding the graft granules with a bridge-like network. No signs of acute inflammation were observed. The histomorphometry revealed 20.1% newly formed bone for MCBA, 32.1% for FDBA, 16.1% for ABB, 22.8% for EB, 20.3% for HA-β-TCP 30/70, and 21.4% for BC. Conclusions Within the limitations of the present investigation, all the six tested biomaterials showed good biocompatibility and osteoconductive properties when used in sinus augmentation procedures, although the FDBA seemed to have a better histomorphometric result in terms of newly formed bone and residual graft material. This trial is registered with ClinicalTrials.gov Identifier (Registration Number): NCT03496688.

The Efficuency of Cream Adhesives for Prosthesis Evaluated by the Wearer of Acrylic Total Prosthesis

The purpose of the study was the clinical evaluation of two types of adhesive cream for prostheses. The group consisted of 46 whole-edged toothless male and female patients treated with acrylic total prosthesis. 23 of the study participants used Corega Neutro (GlaxoSmithKline) and other 23 of the patients used Fixodent Neutral (P&amp;G) adhesive. The patients used the adhesive for 7 consecutive days.After a day�s break, patients filled in a questionnaire in which they appreciated the different qualities of adhesive cream such as a total improvement of the denture retention, improved chewing and phonetic function, or ease of use. The use of the two types of adhesive creams improved significantly in approximately equal proportions the retention of total prostheses, masticatory function and phonetic function. There were no statistically significant differences between the main properties of the tested adhesive creams.

Clinical Evaluation Methods of Oral Cavity Hygiene of Patients with Drug-Compensated Diabetes Mellitus Using Removable Partial Acrylic Prosthesis

Clinical Evaluation Methods of Oral Cavity Hygiene of Patients with Drug-Compensated Diabetes Mellitus Using Removable Partial Acrylic Prosthesis

Color Changes and Stainability of Complete Dentures Manufactured Using PMMA-TiO2 Nanocomposite and 3D Printing Technology-one year evaluation

Color stability through wear and time, one of the most important esthetic factor, influencing patient�s acceptance of an acrylic removable prosthesis, was investigated in vivo in a limited number of studies and solely on prefabricated denture teeth.The aims of the present paper were to assess the color changes occurred with the commercially available PMMA for 3D printing technique, improved by doping with titania nanoparticles, and to evaluate the color stability and stainability of the PMMA with 0.4%TiO2 denture teeth, on denture wearers, over a period of one year. Ten patients rehabilitated with removable complete dentures or implant retained overdentures manufactured using a new nanopolymer, PMMA doped with 0.4% by weight of TiO2 as denture base and artificial teeth material and Digital Light Projection (3D printing) technology, were evaluated in the present study. The color of each denture was assessed with a spectrophotometer, before and after use, in CIE L*a*b* system. The before measurement was made on the positive control - PMMA with nanoTiO2 (PC), while the after was measured the color of the tooth after one year complete denture use. Negative control - PMMA without nanoTiO2 (NC) was also compared to PC and the following parameters were registered: Value (L), Chroma (C), Hue (H), redness/greenness (a) and yellowness/blueness (b). A color difference (DE) between 1.63 and 5.24 was measured for all patients, while for the NC DE was triple (17.65). The highest DE value for all denture wearers with TiO2 nanofiler inclusions was below the maximum acceptability threshold, in accordance to the patient�s subjective evaluation, who were unable to identify the color change.

A Simplified Approach to Fabricate a Hollow Ocular Prosthesis.

The prosthetic rehabilitation of a large anophthalmic socket is always a challenge. It demands an equally sized ocular prosthesis to replace lost tissue volume. A conventional solid acrylic ocular prosthesis may be deterrent to retention and esthetics because of its weight, which can be reduced by eliminating the mass of material within it. This article attempts to present a simplified and accurate technique to fabricate a hollow ocular prosthesis using silicone putty cavity form. It is removed prior to final processing and serves to ensure appropriate uniform thickness of acrylic resin and optimal weight reduction of the definitive prosthesis without compromising mobility, esthetics, and structural integrity.

Rehabilitations of a single element with one-piece implants with electrowelded needles: A different approach

To ensure single dental implant stability, there are some approaches. The stabilization of a single-piece implant by welding it to a titanium needle allows immediate loading and promotes the final osseointegration. The aim of this case report study was an evaluation of long-term clinical outcomes of immediate loading in cases with bone atrophy in the canine region by welding single implant to a titanium needle. In two cases with maxillary atrophic anterior bone, single-piece titanium implants were used. As support structure, a Scialom-type stabilization titanium needle was used (diameter 1.2 mm and suitable length to obtain a bicortical positioning). These two elements were joined together using a Mondani intraoral welder. The implants immediately loaded by temporary restorations. The cases were followed for 24 years, and clinical outcomes were assessed. The use of this method, in the cases with maxillary atrophic anterior bone, allows immediate loading with a fixed acrylic prosthesis at the end of the surgical session. Clinical outcome was successful for 24 years. This approach is a successful method that allows immediate loading in atrophic bone.

Анеуплоїдія букальних епітеліальних клітин: феномен чи потенційна загроза

Aneuploidy is regarded today [1] as a result of reducing and lengthening of large areas (translocations) chromosome movement. Most aneuploid cells die immediately, but the few that survived have thousands of genes dose of which is not the same as in normal cells. Coordinated team of enzymes, providing the synthesis of deoxyribonucleic acid (DNA) and its integrity, breaks in the double helix, have gaps, further destabilizing the genome. The higher the degree of unstable cells aneuploidy the more likely tumor cells will be in the end result. A probability of tumors in the genetic defect presence is not predictable.The aim of the study – to leart the contraction and extension of chromosomal motion on large areas.Materials and Methods. Modern materials used for dental prostheses include crosslinked polymers and somonomery materials to be relatively intact cells of oral mucosa. However, only acrylic detachable plate implants contain potentially hazardous substances, methyl esters of methacrylic acid, which, according to laboratory data, were protoplasmic poisons. But researchers observed the effect of only high doses of unrealistic dentures. The DNA cytometry technology fi xes chromosomal lesions that can potentially cause the development of the tumor and which is likely to be a predictor of tumor growth. DNA content in nuclei of buccal epithelium cells was determined using fl ow cytometry.Results and Discussion. The indicators of cell cycle indicators buccal epithelium in 70 people were studied. Among them 23 patients on the background of the hypothesis of the plate crypt prosthesis, 23 – with the prosthetics on the basis of thermoplastic plastics. The comparison group consisted of 24 clinically healthy people without defects in dentition. Criteria for inclusion were patients with severe systemic diseases, tobacco smoking, burdened allergic history, complete absence of teeth, prosthetic stomatitis, chronic generalized periodontitis in acute condition, refusal of the patient to participate in the survey. The subject of the study was the buccal epithelium of the mucous membrane of the patient’s oral cavity, since the superfi cial epithelium is the main structural and functional component of the mucous membrane. An unexpected damage to the cell cycle during treatment with acrylic prosthesis bases was the detection of aneuploid epithelium, which was detected in 2 patients. These cells are genetically unstable and a sign of readiness for tumor growth and the presence of aneuploidy is associated with more serious complications and is a marker of an adverse prognosis. The study describes aneuploid cells, but there is still a question: is this a phenomenon or a potential threat? We did not fi nd any patient with acrylic prosthesis in whom the development of oral cavity was diagnosed, but it is necessary to know that the duration of using prosthetics was up to 2 years, which does not allow completely evaluating the oncogenic risk of this category of patients.Conclusions. Aneuploidy is a serious violation of DNA that is fi xed when using acrylic dentures. Potential carcinogenicity of this phenomenon requires further study.

MONITORING OF THE QUALITY OF LIFE AND PSYCHOLOGICAL HEALTH OF PATIENTS WITH DIABETES MELLITUS TYPE 2 IN THE TREATMENT OF REMOVABLE LAMINAR DENTURES

The study of dental indicators of quality of life and the psychoemotional status of patients with type 2 diabetes with the orthopedic treatment of partial removable acrylic prostheses was carried out. In the period from 2014 to 2016 it was, carried out examination and treatment of 68 patients with partial adentia 1 and 2 classes at Kennedy in age from 51 to 68 years. The main group (n = 32) consisted of patients with diabetes type 2 diabetes with a disease duration of 6,81,7 years and an average blood sugar level of 8,2 and 1,2 mmol/L. Control group (n=36) consisted of patients without somatic pathology, balanced by gender and age with at group of observation. All patients in the period of orthotic treatment were defined with situational and personal anxiety according to the test Charles D. Spielberger, state of hostility and aggression questionnaire by A. Bass-A. Durka, level of neurotic test L. I. Wasserman. Quality of life related to health was assessed by questionnaire MO SF-36, determination of the degree of influence stomatologic pathology on quality of life in the Profile of the impact of dental health OHIP-14 RU. In the result of the study it was established positive dynamics of studied parameters of diabetic patients with orthopedic treatment of partial removable acrylic prostheses, which suggests that the reconstruction of defects of the dentition reflects not only the fact of improving dental health, but also has a significant positive impact on psychological health and quality of life of these patients.

A novel report on the use of an oncology zygomatic implant-retained maxillary obturator in a paediatric patient

This report details the use of zygomatic oncology osseointegrated implants to support and retain a maxillary obturator in a 13-year-old male patient who underwent a right-sided hemi-maxillectomy (Brown Class 2b) (Brown and Shaw, Lancet Oncol 11:1001–8, 2010) for a myxoid spindle cell carcinoma. At the time of maxillary resection, two zygomatic oncology implants were inserted into the right zygomatic body and subsequently utilised to provide in-defect support and retention for a bar-retained maxillary acrylic obturator prosthesis, which restored the patient’s aesthetics and function to a very high level. Close follow-up over 2 years demonstrated ongoing excellent function and disease control with no deleterious effects on facial or dento-alveolar growth clinically. This is the first clinical report of its kind in the published literature detailing the use of a zygomatic implant-retained obturator in a paediatric patient.

Stress Distribution in an Implant-Supported Mandibular Complete Denture Using Different Cantilever Lengths and Occlusal Coating Materials.

The aim of this study was to assess stress distribution in the bone-implant interface of a mandibular implant-supported prosthesis with different cantilever lengths, aesthetic coating materials, and implant abutments. A photoelastic model of an edentulous mandible, containing 5 external hexagon implants, was constructed. Experimental models were divided into 6 groups: group 1-UCLA component and metal bar; group 2-UCLA component and acrylic resin coating; group 3-UCLA component and porcelain coating; group 4-abutment and metal bar; group 5-abutment and acrylic resin coating; and group 6-abutment and porcelain coating. Forces were applied to the most anterior implant, the most posterior implant, and different cantilever lengths. The results showed a higher number of high-stress fringes as the cantilever length increased. Fringes were better distributed in groups with prostheses composed of acrylic resin and in groups that contained an abutment. The stress distribution in the bone-implant interface is improved when the cantilever is eliminated and when abutments in an acrylic resin prosthesis are used.

An innovative restorative method for management of complex esthetic problems in partially edentulous mouth using the concept of Cu-sil denture

Management of a hard and soft tissue defect with an acrylic prosthesis has been proved to be very successful in the esthetic zone. The gingival prosthesis is provided when surgical management is either difficult or failed. In the present case report is an innovative method of management of Kennedy's Class I maxillary arch with gingival recession in the anterior teeth with a combined prosthesis.