Complete Denture Fabrication Research Articles

Comparative Analysis of Adaptation of Conventional and Printable Complete Denture Bases to the Underlying Casts - An In Vitro Stereomicroscopic Study.

Properly adapted complete denture bases will have adequate retention to the underlying oral mucosa. With technological advancement, there are various techniques of fabrication of complete dentures. There are studies regarding the marginal adaptation of conventional and CAD-CAM denture bases, but there is not enough research comparing the marginal adaptation and polymerisation shrinkage of conventional and 3D printed complete denture bases. In vitro study using stereomicroscopy to determine the marginal discrepancy between the denture base and the cast. Twelve gypsum casts were taken and divided into conventional and 3D-printed groups. Conventional denture bases were fabricated by adapting wax of 2 mm thickness which was subsequently processed whereas 3D printed bases were designed and the standard tessellation language (STL) files were used to print the denture bases. Three points were marked at the mid-palatal line and on both maxillary tuberosities. Digital images were then captured at the marked regions and were used to measure the maximum gap between the cast and denture base at the marked regions. Data were analysed using an independent t-test and one-way ANOVA. Conventional dentures had a significantly lesser marginal discrepancy than 3D printed dentures (P = 0.000). The left maxillary tuberosity showed the highest marginal discrepancy, significantly different from mid-palatal and right tuberosity sites. Conventional dentures perform better than their counterparts in terms of adaptation. This accurate adaptation is vital for the retention of the complete denture.

Comparative evaulation of condylar guidance obtained by digital panoramic radiographic images with that of obtained during jaw relation and try-in using two different interocclusal record material in completely edentulous patients: an in vivo study

Background In completely edentulous patients, maintaining the patient’s temporomandibular joint (TMJ) health and intraoral components is very essential, which can be achieved by an accurate interocclusal record, which can be taken by various materials and also at various stages. Simulation of the temporomandibular joint anatomy and mandibular movements is possible on a semi-adjustable articulator, which is widely used in prosthodontics. Transferring the record on articulator is a critical step in the fabrication of complete dentures, so it should be done precisely to reduce chair side time and also to avoid complications for patients. This study examines which material is more accurate and records which stage gives more precision by comparing the Condylar guidance on radiographs. This is because it is a relatively consistent bony landmark and can be used to correlate with clinical methods in terms of verification. The objective is to determine the inter occlusal records created during the Jaw Relation stage and Try-in using reinforced wax and Polyvinyl siloxane and compare these values to the condylar guidance obtained by orthopantomogram (OPG). Methods Recording the Condylar Guidance value on OPG by tracing the Glenoid fossa, Articular eminence, and the Frankfurt Horizontal Plane. Followed by conventional steps in making complete dentures at jaw relation and try-in stage. We will record values of condylar guidance with the two different Interocclusal record materials. Expected result It will help the clinicians to gain knowledge about obtaining precise condylar inclination angle by using suitable interocclusal record materials. Conclusions This study will help us to obtain condylar inclination, which in turn helps the patient’s satisfaction as it preserves the intraoral components and health of TMJ.

Comparative Evaluation of Condylar Guidance Obtained by Digital Panoramic Radiographic Images Using Two Different Interocclusal Recording Material During Jaw Relation in Completely Edentulous Patients: An In Vivo Study.

Objective To compare the condylar guidance value obtained during jaw relation by two different interocclusal recording materials to that obtained from OPG (Orthopantomogram). Materials and methods Two different interocclusal recording materials were used, namely bite registration wax (reinforced wax, by MAARC Dental Company) and bite registration paste (jet bite, coltene) for interocclusal records during jaw relations. An OPG is shot prior to the treatment, and horizontal condylar guidance (HCG) is traced joining the bony landmarks in a completely edentulous patient seeking complete denture treatment. All the conventional steps for complete denture fabrication up to jaw relation are performed. A facebow transfer is done on a Hanau H2 articulator, and height tracers (extra oral tracing devices) are attached. After satisfactory training, the tracing is performed by the patient, and the interocclusal records are obtained. The articulator is programmed to obtain the value of HCG using protrusive records, which are then compared to the value obtained from OPG. Statistics were carried out to determine angles. Followed by statistical analysis with Pearson correlation to analyze the results (α = 0.01). Results A substantial relationship was discovered between the horizontal condylar inclination between two interocclusal recording materials and the corresponding OPG for both the right (p = 0.0015) and left (p = 0.0007) sides. Conclusion The condylar guidance obtained with jet bite was closer than the condylar guidance value obtained with reinforced wax when compared with the horizontal condylar inclination obtained in OPG by tracing with a mean difference of 10° for polyvinyl siloxane and 20° for reinforced wax in seven subjects evaluated.

3D-Printed Complete Dentures: A Review of Clinical and Patient-Based Outcomes.

There has recently been an increasing trend to shift the fabrication of complete dentures from conventional to digital workflows to shorten the treatment time and increase patient comfort and satisfaction. Digital fabrication of complete dentures can be achieved either by a subtractive process (milling)or by an additive technique (3D printing). The milling process offers numerous advantages; however, they require large-size production machines and are associated with low production efficiency, increased cost, limited block size, and a considerable waste of material. On the other hand, 3D printing technology can potentially offer the benefits of lower manufacturing and equipment costs, good surface details, and lower material waste.Hence, 3D printing is being considered lately by some researchers as a valid choice for manufacturing digital dentures. Therefore, the aim of the current review was to identify and highlight studies on 3D-printed dentures, mainly those investigating clinical and patient-centered outcomes. A search was conducted using thedatabasesPubMed/MEDLINE, Cochrane Library, Embase, and Google Scholar. After applying the inclusion and exclusion criteria, a total of 16 studies that investigated clinical outcomes (masticatory efficiency, biting force, retention and stability, computerized occlusal analysis, and post-insertion maintenance) as well as patient-based outcomes (patient satisfaction, oral health-related quality of life (OHRQoL), patient-related complications, patient preference, and willingness to pay) were included. After a thorough review and discussion of these articles, it could be concluded that 3D printing of complete dentures offers many advantages from both a clinical and patient-based perspective. Retention and comfort with 3D-printed dentures were found to be comparable or even superior to conventional dentures. Moreover, retention of 3D-printed dentures constructed from conventional impressions and digitized casts demonstrated improved retention when compared to a protocol adopting intraoral scanning (digital impressions). Masticatory efficiency, biting force, OHRQoL, and patient satisfaction with 3D-printed dentures varied and were inconsistent among the included studies. Most of the studies reported positive results in the different domains and assessed aspects, while others reported some concerns (especially in terms of aesthetics and phonetics). With regard to post-insertion maintenance, printed dentures showed comparable results to conventional dentures in the short term. The technique seems promising with numerous benefits; however, further clinical research with larger sample sizes and longer follow-up periods is still needed to confirm these conclusions and address the potential concerns.

The Effect of Average Value Mounting and Facebow Transfer on Condylar Guidance Settings in a Semi-Adjustable Articulator - A Comparative Study using Digital Lateral Cephalographs in Edentulous Patients.

While we attempt to restore occlusion in completely edentulous patients there is a consensus among clinicians to articulate the cast using average value and avoid performing facebow transfer. Various studies question the application of facebow transfer in the fabrication of removable complete denture fabrication. This study was therefore aimed to study the effect on condylar guidance with casts mounted by the facebow method, Bonwill's method, and radiographic method. A cross-sectional study was performed using casts of edentulous patients attending the Department of Prosthodontics. After establishing a tentative jaw relationship using wax occlusal rims in the edentulous participants, the casts were mounted by Bonwill's method and the facebow transfer method to a semi-adjustable articulator. Protrusive records of the subjects were used to program the articulator to obtain the condylar guidance values. Digital lateral cephalographs were made both in centric and protrusive jaw relationships. The mandibular condyles were then traced and overlapped to obtain radiographic values. The condylar guidance values obtained by Bonwill's method, facebow method and radiographic method were compared using Wilcoxon's signed rank test and Mann-Whitney U test. The SPSS Statistics for Windows (Version 21.0. Armonk, NY, USA:IBM Corp.), and, at a probability value of 0.05, the significance of every statistical test was predetermined. Ten edentulous 45-70 year olds participated in the study. The mean discrepancy between radiography and facebow methods was 12.8° for the right side and 12.7° for the left (P < 0.005). The difference between radiography and Bonwill's methods was significant (P < 0.005), with a mean difference of 34.3° for the right side and 34.7° for the left side. The difference between Bonwill's method and the facebow method was significant (P < 0.005), with a mean difference of 21.5° for the right side and 22° for the left side. The condylar guidance values obtained by clinical methods (Bonwill's and Facebow) were significantly lesser (P < 0.005) compared to the values obtained by radiographic method.

Dentist's role in fabrication of sophisticated complete dentures

Dentist's role in fabrication of sophisticated complete dentures

Evaluation of the effect of thermocycling on the trueness and precision of digitally fabricated complete denture bases

BackgroundWhile many denture base materials are currently available on the market, little data exists regarding their dimensional stability after exposure to the oral environment. This study aimed to evaluate the effect of thermocycling on the trueness and precision of milled, 3-dimensional (3D)-printed, and conventional digitally fabricated complete denture bases (CDBs).MethodsA completely edentulous maxillary stone model was scanned to generate a standard tessellation language (STL) file; this was imported into metal-milling-machine software (Redon Hybrid CAD-CAM metal milling machine, Redon, Turkey) to produce a metal model for fabricating 30 CDBs. These were divided into three groups (n = 10 in each) according to the construction technique: group 1, CAD-CAM milled CDBs; group 2, 3D-printed CDBs; and group 3, conventional compression molded CDBs. All CDBs were scanned after fabrication and evaluated before and after thermocycling using superimposition. The data were analyzed using a one-way ANOVA, Tukey’s post hoc test, and a paired t-test.ResultsThe level of trueness between the CAD-CAM milled, 3D-printed, and compression molded CDBs showed significant differences before and after thermocycling (P < 0.05). Group 1 showed the highest degree of trueness before and after thermocycling, group 3 exhibited a higher degree of trueness than group 2 before thermocycling, and group 2 had a higher degree of trueness than group 3 after thermocycling. There was a significant difference in the precision for each CDB type before and after thermocycling (P < 0.05).ConclusionThe trueness of the CAD-CAM milling system in complete denture (CD) fabrication is superior to that of the 3D printing and conventional compression molding systems before and after thermocycling. Thermocycling had a significant effect on the precision of all CDB types. The compression molding system in CD construction is the most negatively affected via thermocycling with regard to the measures of trueness and precision.Clinical trial numberNot applicable, no human participants were involved.

Introduction and Effectiveness of Early Clinical Exposure Among Dental Students in Pre-clinical Prosthodontics.

Lack of patient contact in the pre-clinical prosthodontics curriculum makes it difficult for the students to comprehend and correlate the series of complex steps involved in complete denture fabrication. Early clinical exposure in the second year of the undergraduate program will facilitate a smooth transition of dental students from pre-clinics to clinics, thereby helping to mitigate the lacunae existing in the present curriculum. A non-randomized prospective educational interventional study was conducted among 50 second-year dental students. Early clinical exposure in the form of clinical demonstration for complete denture steps of border molding and jaw relation was given subsequent to the completion of didactic and laboratory sessions. Pre- and post-multiple-choice question tests were conducted to explore students' knowledge. Student perception towards early clinical exposure was assessed using a self-administered anonymous questionnaire, while faculty perception was gauged with the help of in-depth interviews. A statistically significant difference was observed when pre- and post-multiple-choice question test mean scores were compared, showing an overall improvement in students' knowledge following early clinical exposure. Students and faculty held a positive perception towards the program and found it to be useful in enhancing the overall learning experience of the students.Faculty expressed their concern regarding limited manpower, paucity of time, and difficulty in integrating early clinical exposure into the present timetable. Early clinical exposure can be integrated into the traditional pre-clinical prosthodontics curriculum with appropriate time and manpower allocation. Faculty sensitization and training workshops need to be conducted before implementing this program.

MECHANICAL STRENGTH ANALYSIS OF RESINS PRINTED WITH THE ADDITION OF NB2O5 NANOPARTICLES

Objective: To evaluate the strength of composite resins used for the fabrication of complete dentures after the addition of niobium pentoxide (Nb2O5). Methods: Different concentrations of Nb2O5 were added to the polymer matrix: 0% (control), 0.5%, 1.0%, 1.5%, and 2.0% per 100 mg of resin. In this context, nanoparticles were incorporated under ideal conditions, and the test specimens were designed using Dentsply Sirona’s inLab MC XL software. After the addition of nanoparticles, samples were printed with dimensions of 25 mm in width, 2 mm in height, and 2 mm in thickness. The test specimens were fabricated through digital printing. Finally, the samples were subjected to mechanical testing for flexural strength and impact resistance. Results: The 0.5% and 1.0% groups showed higher flexural strength values (54.56 and 56.8 MPa), with statistical significance (p&lt;0.05) compared to the 1.5% and 2.0% groups (45.26 and 40.65 MPa). Regarding the modulus of elasticity, the 1.0% group presented the highest value (1.15 GPa), while the 0.5% group obtained 0.98 GPa, showing significant statistical differences (p&lt;0.05) between the groups. In terms of impact resistance, the 0.5% and 2.0% groups exhibited the highest resistance, differing significantly from the 1.0% and 1.5% groups (p&lt;0.05). Conclusion: Niobium pentoxide improved the properties of PMMA in this study, proving to be a viable alternative for the development of denture bases.

The Effect of the Incorporation of a 3D-Printed Titanium Framework on the Mechanical Properties CAD/CAM Denture Base Materials

Background: Complete dentures should withstand occlusal forces and wear. However, over time, dentures can suffer fatigue and develop cracks, chipping, and fractures. Conventional methods for the fabrication of complete dentures involve injection molding, thermal curing, and the use of microwaves with polymethyl methacrylate (PMMA)-based materials. These methods have served well for many years. More recently, the incorporation of computer-aided design and computer-aided manufacturing (CAD/CAM) to fabricate complete dentures has been shown to enhance the dentures’ mechanical properties, including resistance to wear and impact strength. This study aims to investigate the mechanical properties and fracture types of CAD/CAM denture base materials (both milled and printed) as compared to a novel proprietary method that embeds a 3D-printed framework within PMMA-milled blocks. The null hypothesis is that incorporating a 3D-printed framework does not affect the mechanical properties of milled PMMA blocks. Methods: Three groups of bars were fabricated using CAD/CAM methods: printed (P), milled (M), and milled with a 3D-printed metallic framework reinforcement (M + F). A three-point bending test evaluated deformation, followed by an impact fracture test for fracture toughness. A descriptive fractographic analysis assessed the fracture characteristics. A statistical analysis using a paired t-test compared the differences between the groups. Results: The P group showed more elastic deformation than the M and M + F groups (p &lt; 0.05). The M + F group achieved a higher fracture toughness as compared to the M and P groups (p &lt; 0.05). Conclusions: Within the limitations of this experimental study, the null hypothesis can be rejected. Milled samples with an embedded 3D-printed titanium framework possess higher resistance to impact than milled samples without frameworks, and printed samples and milled samples with embedded 3d-printed titanium frameworks present increased flexural strength and lower elastic deformation as compared to milled samples without frameworks and printed samples.

Fabrication of an Immediate Complete Denture with Digital Workflow: A Case Report

Fabrication of an Immediate Complete Denture with Digital Workflow: A Case Report

A Questionnaire-based Study on Impression Materials and Techniques for Complete Denture Construction among Dentists Practicing in Central/Western Regions of Libya

Background: The success of complete dentures mainly depends on impression-making accuracy; thus, dentists need to select the proper impression materials and techniques to achieve optimal outcomes. Objective: To determine the favoured impression materials and techniques used for complete denture construction among dentists practicing in the Central/Western regions of Libya. Materials and Methods: This study was conducted between July 2023 and September 2023. The questionnaire was comprised of 30 questions, which were divided into two parts including; 11 questions for demographic and professional attitude and 19 questions focused on professional steps of complete denture fabrication for edentulous patients. Results: The response rate for this questionnaire was (66%). It was revealed that (96.1%) of respondents used only irreversible hydrocolloid (alginate) as an ideal option for primary impressions. In response to the same question for final impressions, (45.8%) of participants exhibited that polyvinylsiloxane was the favourite choice. Regarding custom trays, (41.7%) of practitioners preferred using light-cured acrylic resin as a custom tray to take definitive impressions. (87.4%) of prosthodontists border molded the custom tray in sections by (81.9%), using modelling plastic impression compound by (92.1%). The most used philosophy for final impression making was the mucostatic impression technique by (50.4%), while (37.0%) used selective pressure and (12.6%) selected muco-compressive. Implant-supported overdenture was discussed as an alternative treatment by (65.4%). The obtained data was statistically analyzed using SPSS 28. Conclusion: This study reflects a diversity of opinion among Libyan dentists during the construction of complete dentures. The most commonly used material for primary impression was irreversible hydrocolloid (alginate) and for final impression was polyvinylsiloxane, which coincides with professional practices worldwide. Modelling plastic impression compound was the most preferred material for border molding. The mucostatic technique was the predominantly used impression philosophy for final impression making.

Utilization Of Neutral Zone Technique In Complete Denture Fabrication For A Class III Sagittal Jaw Relation Patient

Long-term denture wearers have advanced ridge atrophy and atrophy of the musculature of the cheeks and lips and often face challenges associated with decreased mandibular denture stability. This case report highlights the successful implementation of the neutral zone technique in the fabrication of maxillary and mandibular complete dentures to address this issue. Understanding the concept of the neutral zone is essential for achieving optimal denture stability, retention, and speech quality. The steps involved in capturing and utilizing the neutral zone to improve denture stability are thoroughly described. The case exemplifies the effectiveness of the neutral zone technique in overcoming mandibular denture instability for patients with compromised edentulous ridges, resulting in enhanced patient satisfaction, improved oral function and speech.

A method of fabricating a stackable CAD-CAM custom record tray for complete dentures

Digital complete denture fabrication has advanced with the integration of computer-aided design and computer-aided manufacturing (CAD-CAM), intraoral scanning, and 3-dimensional printing. A method of fabricating a stackable CAD-CAM custom record tray for complete dentures is introduced. The method combines a custom tray, record base, and occlusion rim in a single piece.

Complete Denture Preclinical Training Program and Digital Tools: A Pilot Study.

To determine whether digital training improves conceptual skills acquisition for custom tray fabrication and tooth arrangement in the preclinical curriculum for complete denture fabrication. A crossover design study compared third-year student grades after conventional (manual) and digital training. Half the students were trained with conventional techniques prior to digital, while the other half were trained with digital techniques prior to conventional. The first part of the study (DP1) focused on custom tray fabrication and involved 154 students. The second part (DP2) focused on tooth arrangement with 204 students. The effect of preliminary digital training on conceptual skills was assessed by comparing the results of the students using a Student's t-test. Results were also analyzed by ranking on the students' Perceptual Ability Test (PAT) score. Finally, students' satisfaction with the training was investigated. Students who completed the initial digital session achieved better custom tray fabrication and tooth arrangement in the subsequent manual sessions. For manual laboratory work, the most dexterous students (PAT1 group) demonstrated the best performance. However, PAT2 students had the best performance during the digital sessions during DP1, and PAT1 and PAT2 students had the best performance during the digital sessions during DP2. Additionally, 40% of DP1 and 12% of DP2 students expressed satisfaction with digital sessions. With complementary manual and digital teaching, digital tools may be useful for enhanced student learning. Digital training has contributed to improve results in manual sessions but did not affect student satisfaction and remained a limited tool to detect learning difficulties.

Denture base materials: An in vitro evaluation of the mechanical and color properties

ObjectivesThis study aimed to compare the physical and mechanical properties of four denture base materials: Polyan IC (PA), milled polymethylmethacrylate (PMMA), three-dimensional (3D)-printed resin (3DP), and SR Ivocap (SR). MethodsNinety-six samples were prepared and divided into four groups as follows. Group A consisted of 3DP (Asiga DentaBASE, Asiga) fabricated using a manufacturer-recommended 3D printer (Asiga Pro 4k, Asiga). Group B comprised milled PMMA (MP) (Ivotion Base, Ivoclar Vivadent). Group C included PA (BredentSenden), meanwhile, group D involved SR (Ivoclar VivadentSchaan). Cuboid samples (65 mm x 10 mm x 2.5 mm) were used for biaxial flexure strength testing in a universal testing machine (UTM). Cylindrical samples of 20 mm x 40 mm were used for compressive strength testing in a UTM. Additionally, cuboid samples (65 mm x 10 mm x 2.5 mm) were used for Vickers surface hardness testing in a microhardness tester. disk samples (10 mm x 2.5 mm) were employed for color stability testing both in a coffee solution and Coca-Cola, using a digital spectrophotometer. Statistical analyses were performed using one-way analysis of variance and Tukey's post hoc analysis (α=0.05). ResultsMP demonstrated superior compressive strength (p = 0.002) and color stability compared to that exhibited by 3DP (p < 0.001) while displaying similar flexure strength (p = 0.336) and hardness (p = 0.708). MP and PA displayed similar compressive strength (p = 0.081), flexure strength (p = 0.159), and color stability in coke (p = 0.071). However, MP had reduced hardness (p < 0.001) and color stability in coffee (p < 0.001). Moreover, MP demonstrated a higher compressive strength (p < 0.001) than that displayed by SR. However, the flexure strength, hardness, and color stability were similar (p > 0.05). Furthermore, 3DP exhibited comparable compressive strength (p = 0.334) to that of PA but demonstrated significantly lower flexure strength (p = 0.005), hardness (p < 0.001), and color stability (p < 0.001) compared to PA. In comparison to SR, PA had a higher compressive strength (p < 0.001), hardness (p = 0.001), and color stability in coffee (p < 0.001), although they demonstrated similar (p > 0.05) flexure strength and color stability in coke. ConclusionsThe MP and PA demonstrated superior compressive strength than that exhibited by the other materials tested. The tested materials had similar flexure strengths, except for PA which demonstrated superiority over the 3DP. Among all tested materials, PA exhibited the highest hardness, while the 3DP was the least color-stable. Clinical SignificanceConsidering the mechanical properties and color stability, Polyan and milled polymethylmethacrylate are preferred for complete denture fabrication. However, the limited repairability and complex handling of Polyan should be considered.

ASSESSMENT OF NUMBER AND LEVEL OF ATTACHMENT OF BUCCAL FRENUM IN THE EDENTULOUS OLD AGE PEOPLE IN A TERTIARY CARE CENTER OF NEPAL

Background: Frenum is a fold of mucous membrane that encase muscle fibers. Frenum are important anatomical structure during complete denture fabrication. There is paucity of data related to buccal frenum. This study aimed to assess the number and level of buccal frenal attachment among the edentulous age groups and genders in both the maxillary and mandibular arches. Methods: A descriptive cross-sectional study was conducted in the Department of Prosthodontics &amp; Maxillofacial Prosthetics of Chitwan Medical College. In total 97 patients of within the age of 55-85 years’ old participated in the study. In this study demographic details of participants followed by level and number of buccal mucosa in the oral cavity were noted in a predesigned proforma. The collected data was then transferred into SPSS and was analyzed for descriptive statistics using SPSS version 26. Results: In this study, in total 97 complete edentulous patients participated in which 59 (60.8%) were males and rest were females. Single buccal frenum was mostly observed in the maxillary arch. About 49(50.5%) of the participants showed single buccal frenum on right side of maxillary arch, while on the left side 40 (41.2%) of the participants had single buccal frenum. In the mandibular arch, 62 (63.9 %) on the right side and 68 (70.1%) on the left side had no frenum at all. Conclusions: From this study it can be concluded that there is variation in the buccal frenum too. In order to provide proper retention, stability, and support with the least amount of post-placement corrections, a solid understanding of the morphological variation of frenum is thus necessary.

Overview of clinical and laboratory evaluation results of the effectiveness of digital methods for knowledge-based fabrication of complete removable acrylic dentures

This article provides an overview of the conceptual studies of modern digital technologies for the fabrication of complete removable acrylic dentures. Analysis of data of subtractive and additive methods of digital manufacturing shows the advantages of digital CAD/CAM methods over traditional methods. The use of known prepolymerized acrylic blocks in the subtractive milling method has enabled achieving high physical and mechanical properties, optimal spatial accuracy, and minimal thickness of the fabricated dentures. Moreover, residual monomer volume reduction in solid polymer blocks has allowed the high biological inertness and safety of the fabricated structures for prosthetic bed tissues and the patient’s body. Layer-by-layer printing of removable dentures by fused polymer deposition modeling technology results in high spatial accuracy of constructing structures of any degree of complexity and reduced total production time of removable dentures.&#x0D; Despite the intensity of implementation of digital CAD/CAM technologies in the practice of complete removable denture manufacturing, the search for alternative methods of modernization of the known traditional means and methods continues. However, we believe that automation and digitalization of the clinical and laboratory manufacturing of complete removable acrylic dentures has clear prospects for the total replacement of compression pressing and hot polymerization techniques of acrylates. In summary, the potential prospect in the future is a global reassessment of traditional concepts for the fabrication of complete removable dentures, considering the formation of an innovative digital CAD/CAM philosophy and the introduction of computer intelligent systems.

DIGITAL FABRICATION OF COMPLETE DENTURES, COMPARED TO CONVENTIONAL METHODS, MAY OFFER A MORE COST-EFFECTIVE APPROACH WITH IMPROVED PATIENT OUTCOMES

Digitally versus conventionally fabricated complete dentures: A systematic review on cost-efficiency analysis and patient-reported outcome measures (PROMs). Tew, In Meei, Suet Yeo Soo, and Edmond Ho Nang Pow.The Journal of Prosthetic Dentistry (2023). No fund was received. Systematic review.

Ultimate flexural strength and Young’s modulus analysis of denture base resins for masked stereolithography 3D printing technology

of the study is to investigate the ultimate flexural strength and Young’s modulus of some materials, which can be used for complete denture fabrication by Masked stereolithography 3D printing technology.Three groups of five specimens each were fabricated. Two of the groups are 3D printed by Masked SLA 3D printer of two commonly used denture base resins. The third group is set to be a control as the specimens were fabricated of a heat-curing acrylic resin. A three-point flexural test tested the objects, and the data collected was used to determine ultimate flexural strength and Young’s modulus calculation. All the results are compared to the ISO Standard 20795-1.The data shows that the mean ultimate flexural strength of the 3D printed specimens is 87 MPa - 89 MPa. Their results are very similar to those for the heat-curing acrylic resin, which means the ultimate flexural strength is 93 MPa. The mean Young’s modulus obtained for the first group of 3D printed specimens is 2263.21 MPa and 2377.44 MPa for the second one. As for the control group, 2396.06 MPa is achieved. When ISO Standard 20795-1 is inspected, all the data obtained covers the minimum requirements.The limitations of the study concern to some additional factors that should be observed for more detailed evaluation. For example, the level of the final polymerization of light-curing resins for 3D printing, their ability to washstand to different defect and denture-bearing area characteristics (the notch for the labial and buccal frenulum, chambers for torus release, etc.), the ability of the materials to withstand to cyclic load, etc.3D printing is faster and cheaper than conventional methods for complete denture fabrication. The knowledge about the mechanical properties of the different materials for 3D printing is very valuable for properly selecting a material and approach for complete denture fabrication.Nowadays, 3D printing is essential in dentistry. For this reason, observation and knowledge of the raw materials properties is very important for the proper choice of a material and/or technology for each clinical case.