Full Denture Research Articles

Remontagem clínica e ajuste oclusal de próteses totais convencionais em articulador semiajustável

The polymerization process of total dentures causes dimensional changes, making it necessary to remounting these prostheses in a semi-adjustable articulator (ASA) to perform the occlusal adjustment. The objective of this study is to report a clinical case of oral rehabilitation with conventional full dentures, which was performed by the clinical remounting of the prostheses in ASA to perform the occlusal adjustment. A 72 years old male patient sought dental care at the Polyclinic of the State University of Amazonas. After anamnesis, extra and intraoral clinical examinations were indicated for conventional full dentures. After anatomical and functional impressions, working models were obtained, on which orientation plans were made. From the individualization of the upper orientation plane, registration of the facial arch and determination of intermaxillary relations, the models were assembled in ASA. After selection, assembly and aesthetic and functional testing of artificial teeth, the prostheses were polymerized, finishing and polishing. During the installation of the prostheses, there were few occlusal contacts and an anterior open bite. With the prostheses positioned on the edges, the facial arch was recorded to remounting the upper prosthesis in ASA and interocclusal registration in the central relation position for remounting of the lower prosthesis. The occlusal adjustment was performed by means of selective wear to obtain the correct centric and eccentric occlusal contacts. Clinical remounting of total prostheses in ASA is an efficient procedure for performing occlusal adjustment and obtaining bilateral balanced occlusion.

Does the Use of Surface Electromyography Could Improve Quality of Life among Patients Rehabilitated by Mandibular Overdentures on Different Attachments?

Objective: To analyze and compare changes of quality of life parameter among dental patients rehabilitated by the implant-supported overdentures with different attachment systems. Material and Methods: Forty-eight patients were recruited as a study cohort. The implant placement procedure was based on the results obtained by CBCT scanning and individualized surgical templates manufactured for correct implant placement. Each individual received two k3Pro Implants (Sure Type with 4.0 or 4.5 mm in diameter) at the intraforaminal area due to standard protocol of implantation provided by the manufacturer under local anesthesia. All patients were distributed between two groups based on the fact of using either Locator- or ball-attachments. Rank correlation was measured using Spearman correlation coefficient, while linear correlation was evaluated by Pearson correlation coefficient. Results: No statistically meaningful differences were noted regarding patients’ distribution among groups considering age (p>0.05) and gender (p>0.05). Provided patient-level analysis demonstrated that increase of conventional full denture service time was positively correlated with escalation of OHIP-EDENT scores. The most prominent inter-correspondences were noted specifically between longevity of denture service and elevation of scores within “Functional limitation” (r=0.61; p<0.05), “Physical pain” (r=0.51; p<0.05) and “Physical disability” (r=0.57; p<0.05) subdomains. No statistically argumented regressions were noted between increase tendency of OHIP-EDENT scores and gender (p>0.05) or age (p>0.05) parameters. Conclusion: Significant improvements of quality of life measured with OHIP-EDENT were noted for both types of attachments compared to the pre-treatment situation independently of additionally provided surface electromyography-based alignment.

Effect of muscle deprogrammers on muscle activity of masseter and temporalis muscles using surface electromyography: A randomized crossover clinical study

Aim: To investigate the electromyographic activity of masseter and temporalis muscles in full dentate participants after deprogramming with various muscle deprogramming devices (MDDs). Materials and Methods: The current study was a randomized crossover clinical trial. After the screening of 96 individuals, 30 participants were included based on the eligibility criteria. Surface electromyographic (SEMG) activity of masseter and temporalis muscles was analyzed in different clinical conditions: Condition A—at rest without muscle deprogramming, Condition B—after clenching without muscle deprogramming, Condition C—subsequent to 30 min of deprogramming by cotton rolls, Condition D—subsequent to 30 min of deprogramming by Leaf gauge, Condition E—subsequent to 30 min of deprogramming by Lucia jig, Condition F—subsequent to 24 h of deprogramming by Kois deprogrammer. The inter-group comparison was performed using the analysis of variance (ANOVA) test, and the pairwise comparison was done using Bonferroni post hoc test. Results: ANOVA showed a statistical significant difference in the electromyographic activity of masseter and temporalis muscles in tested individuals, subsequent to deprogramming with different MDDs. Between the tested MDDs, the lowest mean muscle activity was reported with the Kois deprogrammer and the highest with cotton rolls, when used for deprogramming. Conclusion: Muscle deprogramming with the Kois deprogrammer presented lowest muscle activity in both masseter and temporalis muscles involving both sides, thus confirming its effectiveness in achieving patient’s centric relation position.

ANALYSIS OF STRESS DURING THE PLACEMENT OF REMOVABLE DENTURES OVER IMPLANTS

Implant-supported removable dentures are one of prosthetic dentistry modalities to replace missing teeth and have a long history of the development. Dentures placed over implants offer opportunities to restore dentition defects resulted from various causes. Different defects of the dentition require their own restorative techniques. In recent years, implant-supported prostheses have become more commonly preferred over full dentures. For patients with low distal bone levels and problems with placement and stabilization, 4-implantsupported dentures seem to be a good option. Four bar implants for supporting dentures are considered more reliable in terms of fixing the prosthetic structures over them. The aim of this work is to analyze the effect of implant-supported denture placement on the implants themselves and peripheral tissues, depending on the denture models, level of implant placement, the angle of placement, as well as the length of the console in the structure. Results. In 10 different mathematical models, the angles of implant placement in the bone were taken as equal to 90°, 17° and 30°, and the level of placement was equal to 1 mm and 3 mm (in accordance with the configuration of the jaw bone). The length of the cantilever bar system prepared on implants was 0 mm, 5 mm and 10 mm in different models. The load on the model was actually equal to the chewing pressure, 100 N (approximately 10.2 kg), when chewing a 1 cm solid food mass. The pressure was applied from 3 different points: from the anterior section, when the centre of the bolus was at the place of contact between the central incisors; in the right posterior region, when the centre of the bolus was at the contact between the 2nd premolar and the 1st molar; from the left posterior region, when the centre of the bolus was in the area of contact between the 2nd premolar with the 1st molar. After 3D analysis, the Von Mises stress findings in the implant area and the corresponding color scales were obtained, as well as the maximum and minimum stress values in accordance with the color scale. Conclusion. Based on the analysis and comparison of the obtained values, the study has determined that the stress distribution is optimal for some implant models, for others it can be too small or too large due to uneven stress values. The study of models based on the method of 3D three-dimensional stress analysis by the finite element method and the results of these studies are elucidated in the article.

Development of adhesive for full removable dentures fixing

Development of adhesive for full removable dentures fixing

Computer Engineering Complete Dentures Workflow: Systematic Techniques Review

Background: The progress in the use of computer-aided design/computer aided manufacturing (CAD/CAM) to fabricat removable prosthodontic prostheses in dental clinics has been exponential. Commercially existing CAD/CAM denture techniques grow every year with increasing benefits to dentists and patients.&#x0D; Study Design: Systematic review.&#x0D; Aims: This review assessed and evaluated the different clinical production protocols of presently accessible CAD/CAM denture systems that offer decision support for dental practitioners.&#x0D; Methodology: Data for the current object were collected by surveys from different companies manufacturing the Computer Engineering Complete Denture (CECDs). All related subjects published at the last 10 years were collected and included in this review. Techniques were arranged in alphabetical order, as follows. AvaDent Digital Dentures (Global Dental Science), Baltic Denture Creator System (Merz Dental GmbH), and Ceramill Full Denture System (Amann Girrbach AG) can manufacture denture fabrication in three visits, including a try-in step. DENTCA Digital Dentures (Whole You Nexteeth, Inc) can also perform this in three visits. The Wieland Digital Denture (Ivoclar Vivadent, Inc) can manufacture in four dental appointments. Recently developed VITA VIONIC Digital System (VITA Zahnfabrik, Bad Säckingen, Germany) can perform two-step CECD manufacturing.&#x0D; Results: Most of the systems involved subtractive manufacturing for the fabrication of their dentures and only closed systems. However, Baltic Denture System and VITA VIONIC material types are an open structure that allow users to choose among different handling protocols. It can be shared with several unclosed digital scanner, CAD software options, and milling machines.&#x0D; Conclusions: The six existing CECD fabrication systems offer many advantages. The decision on which technique to use may be contingent on the dentist’s prosthodontic expertise, patient output amount, and requirements concerning denture individualization.

P.0340 Effects of interventions for anxiety on peripheral inflammation: a systematic review and meta-analysis

To develop an in situ model for erosive wear research which allows for more clinically relevant exposure parameters than other in situ models and to show tooth site-specific erosive wear effect of an acid challenge of orange juice on enamel.This pilot study included 6 edentulous volunteers wearing full dentures with 13 embedded enamel samples The study consisted of two control runs: habitual diet only for 30 days, and two experimental runs: habitual diet plus 125 ml orange juice four times per day (consumed over 4 m). In the first experimental run subjects were instructed to take the drink in their mouth and promptly swallow it. In the second experimental run subjects take the drink in their mouth and hold each 25 ml for 30 s, moving it around their mouth before swallowing. Sample enamel surface loss was measured using non-contact surface profilometry.Drinking of orange juice additional to the habitual diet, caused significant but low increased erosive wear at buccal, palatal and lingual specimens. Significantly higher levels of tissue loss were found on all surfaces in the swishing experiment but molars (especially occlusal specimens in mandibular molars), palatal specimens sited in upper anterior teeth and lingual specimens in lower anterior teeth were most affected.The model showed clinically relevant patterns of erosive tooth wear as seen clinically in erosive wear patients.The model could have many applications to study clinically erosive wear for specific diets or consumption patterns and to test preventive measures.

РАЗРАБОТКА И НАЗНАЧЕНИЕ ФУНКЦИОНАЛЬНОГО ПИТАНИЯ ПАЦИЕНТАМ, ПОЛЬЗУЮЩИМСЯ ЗУБНЫМИ ПРОТЕЗАМИ

Till present times nutritiology and dietology in dental practice are at rudimentary level. At the same time it is a well-known fact the chewing efficiency is much higher in case of having fixed prosthesis comparing with their removable denture counterpart. As for elderly population nourishment it is important to take into consideration the complexity of receiving of all the necessary nutrients. Quantity and quality of the food diet will directly affect their quality of life.&#x0D; Aim. Development of the functional food diet ration for specific groups of dental patients &#x0D; Materials and Methods. We surveyed 244 patients (84 males, 160 females) in the age range from 60 to 85 years (mean value 75.4+/-2.4) with different types of implant supported prostheses. We used clinical, sociological, nutritiological evaluation methods. Besides that we used GOHAI questionnaire and modified Wolfart questionnaire. &#x0D; Results. We defined basic groups of dental patients who have indications for prescribing functional food diet:&#x0D; a) patients utilizing removable dentures, especially full dentures, in the situation where antagonists would be intact dentition or dental arches with conventional or implant supported fixed bridges;&#x0D; b) patients treated with immediate removable dentures, fixed implant supported prostheses, especially in case of big span bridges with limited amount of fixtures;&#x0D; c) patients using removable implant supported overdentures;&#x0D; d) Patients older than 70 years of age.&#x0D; We established food rations based on intaking soft low viscosity liquid meal. High GOHAI scores (56.1+/-1.49) were the prove of the high efficiency and efficacy of the rehabilitation per se and also of the functional diet regimen recommended to the examined patients.&#x0D; Conclusions. We developed functional food diet taking into consideration the short and long term period after finishing the implant supported or conventional, immediate or delayed prosthetic rehabilitation with the use of total prosthesis predominately for edentulous patients. Incorporation of these types of diet regimen in the rehabilitation plan oriented towards increasing the efficiency of the main treatment arrangements.

Denture Hygiene Habits among Elderly Patients Wearing Complete Dentures

Aim: To determine the denture cleaning routine and habits in complete denture wearers according to cleaning frequency, patient age and life of dentures. Methods: In this cross-sectional study, a self-administered questionnaire was designed to learn about patient’s attitudes toward denture cleanliness in the Prosthodontics department. A detailed questionnaire was applied for total 130 patients visiting the Department of Prosthodontics in the Rehmat memorial postgraduate hospital Abbottabad for follow-up care. Data was recorded and analysed by using SPSS version 15.0 for results. Results: Total 130 participants including 90 males (69.3%) and 40 females (30.7%). 48.6% of participants clean their dentures every day, 32.9% once a week, and 18.5 % only occasionally. The highest percentage is seen in Group 1, which is 41.2%. Approximately 77% of Group 2 participants clean their dentures at least once a week, including both daily and once-a-week denture wearers. 71 individuals had been wearing dentures for 3-5 years. 41.2% of them clean their dentures every day, while 58.6 percent clean them twice a week. 6-8 years denture wearers do not clean them on a regular basis. Most patients 42% use only water, while 30% use a combination of water and a toothbrush. Around 20% of participants used soap and water, but only 8% of denture wearers utilised cleansing tablets in addition to water. There was significant difference among all groups (P=0.001). Conclusion: In this study it has been observed that full denture patients have trouble cleansing their dentures. A lack of regular cleaning practises and decreased use of cleaning solutions is the primary cause of poor denture hygiene among the seniors. Dentists should educate patients regarding optimal denture maintenance and materials used for cleaning verbally and in written form. Keywords: Denture Complete Denture hygiene, cleansing Habits, Denture cleaning solution.

Estudo comparativo de tratamento da estomatite protética pelo reembasamento ou substituição das próteses totais

This clinic survey aimed at comparing two different treatments for patients using full upper denture and having clinical Denture Stomatitis diagnosis. Thirty patients were selected and divided into two groups. Group I included 18 patients, whose dentures were replaced by new ones. Group II included 12 patients, whose full dentures currently used were relined. Patients were followed-up during 8 weeks. Patients of both groups were required to remove their dentures at night to be disinfected with Sodium Hypochlorite solution. The results observed show Denture Stomatitis was cured within 4 weeks in 90% the cases for both groups, showing no significant statistical differences. It may be concluded that both dentures replacement and their filling, associated to hygiene and disinfection show efficacy in Denture Stomatitis control.

Oral health-related quality of life and satisfaction in edentulous patients rehabilitated with implant-supported full dentures all-on-four concept: a systematic review.

Address oral health-related quality of life (OHRQoL) and patient satisfaction rehabilitated by the all-on-four concept as the primary outcome. A search was performed in the PubMed/MEDLINE, Web of Science, and Cochrane databases according to the Preferred Reporting Items for Systematic Reviews and Meta-Analysis criteria (PRISMA). The PICO question was used to address the following specific question: "What is the level of oral health-related quality of life and satisfaction in edentulous patients and with atrophic jaws who received dental implants for full-arch implant-supported restorations following the all-on-four in the mandible or maxilla?" Eleven studies including 693 patients aged 55 to 71 years were selected. The shortest follow-up period was 3 months and the longest, 7 years. Regarding the OHRQoL assessment method and patient satisfaction, the oral health impact profile (OHIP) and the visual analog scale (VAS) were the most used. OHRQoL and satisfaction in patients whose rehabilitation was based on the all-on-four concept were high. However, the current evidence is still limited by the quality of the available studies, making long-term randomized studies necessary to establish the real effectiveness of this surgical-prosthetic approach. Carefully analyze the aspects related to satisfaction and oral health-related quality of life of rehabilitated patients with implant-supported total prostheses made according to the all-on-four concept, aiming to achieve success through procedures with greater predictability and less complexity, as these are directly associated with recovery oral health of edentulous individuals with less morbidity and minimized costs.

Tooth loss, dental prostheses use and cognitive performance in older Brazilian adults: The SABE cohort study.

To investigate the within- and between-person longitudinal effects of tooth loss and the use of dentures, clinically assessed by dentists, on cognitive decline in a representative sample of community-dwelling older Brazilian adults. Data came from 1265, 1112 and 1021 individuals aged ≥60 years who participated in the second (2006), third (2010) and fourth (2015) waves, respectively, of the Health, Well-being and Aging study (SABE). Cognitive performance was evaluated with the abbreviated version of the Mini-Mental State Examination (MMSE). The number of natural teeth was classified according to three categories: none, 1-19 and ≥20 teeth. The presence of removable full or partial dentures in each dental arch (yes/no) was recorded. Hybrid regression models, adjusted for sociodemographic, behavior and health-related covariates, were used to estimate the between- and within-person effects of the longitudinal association between cognitive performance and oral health. Participants with 1-19 and no teeth had, respectively, 1.15 (95% CI 0.65-1.66) and 1.54 (95% CI 0.99-2.09) units lower MMSE score than those with ≥20 teeth. Denture wearers had 1.54 (95% CI 1.13-1.95) units greater MMSE score than non-denture wearers, and those who started wearing dentures during the follow up had 0.83 (95% CI 0.21-1.45) units greater MMSE score after the transition. Our main findings showed that the use of dental prostheses might be a protective factor for cognitive decline. Geriatr Gerontol Int 2021; 21: 1093-1098.

Application and outlook of robotics in prosthetic dentistry

At present, robotic system has been applied in many aspects of the field of prosthetic dentistry, such as tooth preparation, oral implant surgery, full denture arrangement, prosthodontic material testing and robotic education of prosthodontics. The advantages of prosthodontic robotics lie in their ability to perform quantitative and precise operations whilerepeating the work flow indefinitely, which assist dentists to complete heavy and complicated daily treatment. In the research and development of prosthodontic robotics, the limitation of oral operation space should be fully considered, and robotics should have high safety and flexibility. The review briefly summarizes the application and existing problems of robotics in prosthodontics, and provides references for further development and design.

Analysis of the Hardness of Soft Relining Materials for Removable Dentures

The main functional feature of elastomeric soft linings materials is the ability to discharge loads in the tissues of the mucosa. As a result, there are fewer injuries to the mucosa and chewing ability increases. In addition, these prostheses are more comfortable in the patient’s opinion. To obtain the equal distribution of forces on the muco-bone basis and to reduce the traumatizing effect of the denture plate for patients using full dentures, soft lining materials can be used. Aim of the study: the aim of the work was a comparative laboratory study of ten materials used for soft lining of acrylic complete dentures. Methodology: Materials based on acrylates (Vertex Soft, Villacryl Soft, Flexacryl Soft) and on silicones (Sofreliner Tough Medium, Sofreliner Tough Medium, Ufi Gel SC, GC Reline Soft, Elite Soft Relining, Molloplast) were compared. Laboratory tests include tests of changes in Shore’a A hardness of soft lining material. The tests were conducted taking into account 90 day term aging in the distilled water environment based on the methodology presented in the European Standard ISO 10139-2. Results: For most silicone materials, only small changes in hardness were found in the range of 0.7 (Ufi Gel SC) to 3.3 (Sofreliner Tough Medium) on the Shore A scale. The exception was GC Reline Soft, for which a marked increase in hardness was noted. All materials based on acrylates were characterized by successive increase in hardness over time. However, in the case of the Vertex Soft material, the increase in hardness was relatively small (5.5 ShA).

Flabby Ridge, a Challenge for Making Complete Dentures

In the case of old mobile denture wearers, one of the main problems is related to the dentures’ retention and insufficient stability. Our goal was to improve support and stability using a different type of final impression, with different types of impression materials. In this study we chose a number of three complete edentulous patients who presented for complete oral rehabilitation. They were wearing full acrylic dentures with poor support and stability. Complete examination revealed the presence of the flabby ridge. The impression methods for the prosthetic fields with a flabby ridge differ from the classical method by using techniques that involve the use of at least two impression materials with fluid consistency to record all the details of the prosthetic fields in the final impression, this being done in two steps; the impression of the flabby ridge areas must be done without pressure, in its resting position. The impression methods we applied led to the expected results, and the dentures succeeded in offering the patient the desired functional comfort. Using fluid impression material for the flabby ridge in a resting position, and a fenestrated custom tray, offered a good quality in adaptation, maintenance and stability of the final dentures.

Estudo comparativo de tratamento da estomatite protética pelo reembasamento ou substituição das próteses totais

This clinic survey aimed at comparing two different treatments for patients using full upper denture and having clinical Denture Stomatitis diagnosis. Thirty patients were selected and divided into two groups. Group I included 18 patients, whose dentures were replaced by new ones. Group II included 12 patients, whose full dentures currently used were relined. Patients were followed-up during 8 weeks. Patients of both groups were required to remove their dentures at night to be disinfected with Sodium Hypochlorite solution. The results observed show Denture Stomatitis was cured within 4 weeks in 90% the cases for both groups, showing no significant statistical differences. It may be concluded that both dentures replacement and their filling, associated to hygiene and disinfection show efficacy in Denture Stomatitis control.

Impact of Wearing Dentures on Dietary Intake, Nutritional Status, and Eating: A Systematic Review.

A key purpose of denture provision is to enable eating, yet the body of evidence pertaining to the impact of dentures on wide-ranging nutritional outcomes has not been systematically reviewed. To systematically review published evidence pertaining to the effect of wearing removable dental prosthesis on dietary intake, nutritional status, eating function, and eating related-quality of life (ERQoL). Eight questions relating to the impact of wearing dentures on nutritional outcomes were addressed. The target population was healthy adults aged ≥18 y. Data sources included Medline, Embase, CINAHL, and PubMed. Included were all human epidemiologic studies. The Newcastle-Ottawa score was used for appraisal of study quality. Harvest plots, vote counting, and accompanying narrative provided the basis for synthesis. Of the 1,245 records identified, 134 were retrieved and eligibility assessed by 2 reviewers, and 41 studies were included in the synthesis (14 rated good quality, 20 fair, and 7 poor). The balance of data supported a positive impact of wearing full (5/7 studies) or partial (3/3 studies) dentures (vs. no dentures) on nutritional status, though no clear direction of effect was detected for the impact of dentures on dietary intake. The balance of data clearly showed that objective measures of eating function were compromised in full (14/15 studies) and partial (6/7 studies) denture wearers as compared with the dentate. Data showed that ERQoL was also compromised in denture wearers as compared with the dentate (3/3 studies). However, data showed a positive impact of wearing dentures on ERQoL (5/5 studies) as opposed to wearing no dentures. The balance of evidence shows that despite no clear pattern on impact of wearing dentures on measured dietary intake, in those with tooth loss, wearing dentures can have a positive impact on nutritional status and enjoyment of eating. The results of this systematic review can be used to advocate for health care services to address prosthodontic need to benefit nutritional outcomes. The findings will be of use in educating health care professionals on the impact of wearing dentures and not addressing prosthodontic need on nutritional outcomes.

Pure titanium denture large-span frameworks additively manufactured with selective laser melting

Objective: To investigate the accuracy of pure titanium and cobalt-chromium alloy frameworks fabricated using the additive manufacturing (AM) of selective laser melting technology (SLM) for the mandibular implant-supported fixed prostheses and the maxillary removable partial denture (RPD), and to provide a reference for clinical application of SLM pure titanium frameworks. Methods: One edentulous mandibular model with implants and screw fixed abutments at bilateral canines and the first molars was selected and used as the mandibular full arch implant-supported model. At the same time, a Kennedy class Ⅰ maxillary dentition defect model was selected. The digital models were obtained by scanning the dental models, and the metal frameworks of the mandibular full arch implant-supported denture and the maxillary RPD (design model) were designed using the 3 Shape software. Meanwhile, 12 mandibular frameworks in the cobalt-chromium alloy and the pure titanium (6 in each group were treated with heat treatment, while the other 6 were not treated), and 7 maxillary frameworks in the cobalt-chromium alloy and the pure titanium were respectively made by SLM with the improved dual-laser metal printer. The axial direction of the printing powder accumulation was taken as the Z-axis. During the design process, the software (3Shape Dental System 2018) automatically generated the X-axis and Y-axis, X axis was the sagittal axis of the dental model and Y axis was the coronal axis of the dental model. The deviation of the interface center of the abutment of the digital model of the mandibular frameworks from the design model in the X, Y and Z axes was analyzed. As for the trueness of the mandibular framework, the larger the deviation data was, the worse the trueness was. The deviation of the whole maxillary framework and 7 measuring points (palatal plate center point and bilateral occlusal rests, I bars, proximal plates) were analyzed. The fitness of the whole maxillary framework to the design model was expressed by root mean square (RMS) of the deviation data, and the fitness of measuring points was expressed by the mean±standard deviation of the data. The trueness differences of each group before and after heat treatment of the mandibular framework and the fitness of the maxillary framework were compared. Results: The cobalt-chromium alloy frameworks showed lower trueness on the X, Y, Z-axes [(96.3±12.1), (86.3±11.4), (61.2±13.2) μm] than did the pure Ti frameworks [(82.3±11.2), (72.2±10.2), (51.2±11.6) μm] by SLM, and the heat treatment could reduce the discrepancy between the SLM frameworks and STL models, for pure titanium frameworks [(62.4±11.3), (55.2±13.2), (41.3±10.8) μm] and for cobalt-chromium alloy [(84.5±10.5), (72.3±11.2), (54.2±11.6) μm]. For the thin RPD major frameworks, pure titanium had better fitness [(121.3±17.0) μm] than cobalt-chromium alloy [(174.0±18.3) μm] by SLM, and the difference was statistically significant (P<0.05). Conclusions: Pure titanium frameworks fabricated by SLM additive manufacturing technology exhibited better fitness and trueness than did the Co-Cr frameworks after heat treatment respectively, and this satisfied the requirements of implant-supported fixed prostheses and RPD major metal frameworks.

Satisfaction of users of full dentures with adhesive: A systematic review of the literature

Objective: To review the literature systematically in relation to the effectiveness of the adhesive for dental prostheses presented in terms of patient satisfaction and to evaluate the differences regarding the use or not of them. Methodology: A search was carried out in the databases PubMed / MEDLINE, Embase, Scopus and Web of Science according to the criteria of Preferred Reports for Systematic Reviews and Meta-Analysis. The PICO question was used to address the following specific question: "Patients who use adhesives on full denture satisfaction?". Results: Sixteen studies with a total of 1133 patients with age average of 67 years were included; in relation to masticatory capacity, improvement was found in feeding, increased vertical movement in the mandible and less intrusion of the prosthesis. As for satisfaction, studies have shown greater comfort, improvement in social, psychological, quality of life and oral health and self-confidence. No serious side effects have been reported and only oral adverse events have been coded. Conclusion: Although adhesives for dental prostheses do not improve their function, that is, they are not capable of problems related to anatomy or errors in the manufacture of the prosthesis, they affect as subjective evaluations of patients. The use of adhesives for prolonged complete dentures increases their retention and stability and positively affects the patient's satisfaction with regard to masticatory capacity, comfort and confidence, provided the recovery is adequate.

Возможности применения композиционных материалов и цифровых технологий на этапах ортопедического лечения пациентов с полным отсутствием зубов

The relevance of the study is dictated by the need to increase the efficiency of prosthetic treatment of patients with full absence of teeth, through the introduction of new composite materials, the use of which provides high strength of prosthetic structures, as well as the development of methods for the manufacture of full removable plate denture using modern digital technologies, which in general contributes to increase the service life of dentures, especially in the presence of difficult clinical conditions.&#x0D; Purpose of the work: increasing the efficiency of prosthetic dental treatment of patients with full absence of teeth on the basis of the development and implementation of a new design of a full removable plate denture with a base made of acrylic resin and an introduced frame made of composite material based on fiberglass.&#x0D; Materials and methods: taking into account the analysis of data from domestic and foreign literature, a design was developed and a technology for manufacturing a full removable plate denture with a combined basis was proposed, the frame of which was made of composite material Trinia. In the course of the work, the morphology and microstructure of a new combination of polymers were studied, and also, in a comparative aspect, their physical and mechanical properties were evaluated.&#x0D; Results: during the study of the microstructure, we found that the composite material based on glass fiber has a chemical bond with acrylic resin and a high homogeneity of the structure. Physicomechanical tests showed that when the base resin is reinforced with Trinia material, an increase in the strength of the samples under study is noted, which exceeds the existing analogues. Clinical and laboratory stages of manufacturing a new design, combining analog and digital methods, have been developed and tested.&#x0D; Conclusions: the introduction of a composite material into the design of a combined full removable plate denture will improve the strength properties of its base, increase performance and reduce weight. The use of digital technology will enable the use of high-strength composite materials.