Denture Teeth Research Articles

CAD-CAM denture teeth made on cast metal removable partial denture frameworks

Once the fit of the cast metal framework on a removable partial denture (RPD) has been verified, the manufacturer’s prefabricated denture teeth are typically secured on the cast metal framework to prepare for a wax evaluation. Although prefabricated denture teeth are available in different tooth forms and sizes, they require modification to fit an edentulous space. In arches with severe space discrepancy, it may be inefficient and time-consuming to make modifications to prefabricated denture teeth. The technique described uses digital technology to fabricate custom denture teeth on a cast metal framework and establish harmonious occlusion. An edentulous space with more than a single tooth replacement is designed as a splinted fixed partial denture with a connector. The designed teeth are milled in the double-cross-linked polymer to prepare for a wax evaluation, and once verified, the RPD is processed by using heat polymerization. Modifications are made to the milled denture teeth after wax elimination to reduce the likelihood of acrylic resin bond failure.

Comparative cost-analysis for removable complete dentures fabricated with conventional, partial, and complete digital workflows

Statement of problemComparative cost-analysis related to different manufacturing workflows for removable complete denture fabrication is seldom performed before the adoption of a new technology. PurposeThe purpose of this study was to compare the clinical and laboratory costs of removable complete dentures fabricated with a conventional (workflow C), a partial digital (workflow M), and a complete digital (workflow D) workflow and to calculate the break-even points for the implementation of digital technologies in complete denture fabrication. Material and methodsClinical and laboratory costs for each of the investigated workflows and the manufacturing options related to denture base and denture teeth fabrication were collected from 10 private Italian dental laboratories and clinics. The selected variables included the clinical and laboratory manufacturing time needed to complete each workflow (opportunity cost); costs for materials, labor, packaging, and shipping; and capital and fixed costs for software and hardware, including maintenance fees. The effect of manufacturing workflows and their options on the outcomes of interest was investigated by using generalized estimated equations models (α=.05). Cost minimization and sensitivity analysis were also performed, and break-even points were calculated for the equipment capital costs related to the implementation of workflows M and D. ResultsFrom a laboratory standpoint, workflows M and D and related manufacturing options significantly (P<.001) reduced manufacturing time (5.90 to 6.95 hours and 6.30 to 7.35 hours, respectively), and therefore the opportunity cost of each denture compared with workflow C. Workflow M allowed variable costs savings between 81 and 169 USD, while workflow D allowed for an additional saving of 34 USD. The sensitivity analysis showed that the break-even point related to the capital investment for the equipment needed to implement workflows M and D could be reached, depending on the manufacturing options adopted, between 170 and 933 dentures for workflow M and between 73 and 534 dentures for workflow D. From a clinical standpoint, workflows C and M were almost identical. Conversely, workflow D, which included intraoral scanning, required 1 fewer appointment, saving 0.6 hours of chairside time and about 14 USD for materials compared with M. ConclusionsDigital workflows (partial and complete digital workflows) were more efficient and cost-effective than the conventional method of fabricating removable complete dentures, with workflow D showing the lowest opportunity and variable costs and break-even point. Savings increased when stock denture teeth were replaced with milled denture teeth and still further with the adoption of 3-dimensionally (3D) printed denture teeth. Milling equipment and materials for denture base fabrication were more expensive than those for 3D-printing. Milling monobloc dentures reduced opportunity and labor costs but increased material cost.

LIERATURE REVIEW TEKNIK PEMERIKSAAN RADIOLOGI MOLAR PADA KLINIS IMPAKSI DENGAN MENGGUNAKAN MULTIMODALITAS

Background: Dental tooth impaction is a state of latent or not erupted or partly erupted after a normal eruption time, Impacted teeth can be estimated clinically and can be confirmed by radiographic examination.&#x0D; Methods: This study aims to determine the radiological examination technique of molars in clinical impaction using multimodality based on a literature review. This research is library research. The data collection method used in this research is the method of theory study/literature study/library study.&#x0D; Results: Based on studies from several journal literatures, there are several radiological techniques that can be performed in clinical molar impaction such as periapical intraoral radiography, panoramic, CBCT, and MRI. On periapical intraoral radiology, the molars and panoramic radiographs do not clearly show molars impacted with the mandibular canal and inferior alveolar nerve, but on CBCT and MRI they are clearly visible using existing sequences and techniques. However, with the use of CBCT modalities, the radiation obtained is very high. Therefore, the use of a radiation-free MRI modality is a highly invasive examination for clinically impacted molars.&#x0D; Conclusions: With a variety of available modalities for clinically impacted molars, it is recommended to use intraoral periapical and panoramic if the case or clinical can still be seen in that modality, if not or less visible in that modality with certain cases or clinical can be used CBCT examination but do not overuse of these modalities because the ionizing radiation emitted is very high/dangerous. It is suggested that the use of dental MRI modalities could be increased in an important step towards being radiation free, improving intervention planning and thereby increasing the overall patient benefit.

Complications Associated with Metal Resin Fixed Complete Dentures Based on Implant Distribution.

To compare prevalence and type of complications associated with metal resin fixed complete dentures based on implant distribution. This retrospective study included data collected for a period of 12 years for patients treated with maxillary and mandibular implant-supported fixed complete dentures at Loma Linda University School of Dentistry. In total, 223 patient's charts were reviewed which included 100 maxillary and 123 mandibular fixed complete dentures. Implant distribution and prevalence of complications associated with each implant-supported fixed complete denture were documented. Tooth delamination, the most common complication associated with fixed complete dentures, was compared between 2 implant distribution groups in each arch. Covariates including age, sex, opposing arch, cantilever occluding units, and number of implants were evaluated to determine their association with tooth delamination. Data and hypotheses were statistically analyzed using descriptive statistics along with logistic regression model. All tests of hypotheses were considered statistically significant at an alpha level of 0.05. In the maxillary arch, some effect of the prevalence of tooth delamination was seen for the group that had implants placed posterior to canine eminence but it was not statistically significant. Denture tooth delamination had the highest prevalence among complications irrespective of implant distribution. Significant denture tooth delamination was seen for patients with opposing fixed complete dentures in comparison to patients with removable opposing arch prostheses. Implant distribution is not a significant factor related to metal resin fixed complete dentures. Opposing fixed complete dentures have a significantly higher association with denture tooth delamination.

Preprinted anterior tooth guides used to assist complete denture tooth arrangement

Although many advancements have been made in preventive and reconstructive dentistry, treating edentulism still remains a challenge.1 One of the challenges in complete denture prosthodontics is communicating information regarding the optimal shape and position of the maxillary anterior teeth to the dental laboratory technician.

Editorial: Dental Ceramics: From Science and Technology to Clinical Application

Editorial: Dental Ceramics: From Science and Technology to Clinical Application

Wear and Fracture Resistance of 3D-Printed Denture Teeth: An In Vitro Comparative Study.

The longevity of removable prostheses is mostly influenced by the properties of the used materials. The ability of the material to withstand high occlusal loads without deformation can enhance patient satisfaction and quality of life. This in vitro study aimed to investigate the wear and fracture resistance of three-dimensional (3D)-printed teeth compared with commercially available acrylic resin teeth. A total of 40 prefabricated acrylic teeth and 40 3D-printed teeth were prepared in two forms: anatomical for fracture resistance or flat for wear resistance (n = 10). For wear evaluation, specimens were scanned at baseline and then subjected to thermal cycling (10,000 cycles). This was followed by a chewing simulator (60,000 cycles) against either metal or natural tooth. Then, the specimens were scanned again. Wear analysis was performed by superimposing the standard tessellation language (STL) files from baseline and the final scans with the aid of GOM Inspect 2020 software. Fracture resistance was assessed with a universal testing machine at a crosshead speed of 0.5 mm/min before and after thermal cycling. Data were analyzed with two-independent t-test and two-way ANOVA (α = 0.05). The 3D-printed teeth showed significantly lower wear resistance than the prefabricated ones with both antagonists (metal, p = 0.049; natural tooth, p = 0.021). The fracture resistance of the 3D-printed teeth was significantly higher than that of the prefabricated teeth before thermocycling (p = 0.042). After thermal cycling, the fracture resistance of both groups was decreased with no significant differences between them (p = 0.266). The 3D-printed teeth showed lower wear resistance and higher fracture resistance than the prefabricated ones. Thermal cycling negatively affected the fracture resistance of 3D-printed teeth.

Evaluating bond strength of acrylic teeth to conventional and high impact denture base resin incorporating various groove designs

Purpose: In spite of chemical union between acrylic resin teeth and acrylic denture base material, detachment of teeth particularly anterior teeth is a frequent observation. The purpose of this study was to evaluate shear bond strength between denture base resin and acrylic resin denture teeth after incorporating various grooves on the ridge lap area. Materials &amp; Methods: A total of 60 samples were prepared and divided into two groups with 30 samples each. Sample in group I were processed with conventional resin whereas in group II with high impact resin. The teeth in each group were subjected to no treatment, vertical groove &amp; Horizontal retentive goove placement on the ridge lap area. In each group unmodified teeth served as control. A shear force was applied at an angle of 130 degrees to the lingual surface of teeth using instron universal testing machine until fracture occurred. Data obtained was statistically analysed using Post hoc and Mann-Whitney Test. Results: Unmodified resin teeth showed the least bond strength. Modification of teeth with vertical and horizontal groove significantly improves the bond strength with denture resin. A significantly greater force was required to fracture teeth from high impact resin and with vertical groove.

Novel fully digital workflow for removable partial denture fabrication

Background: Digital dentistry technology based on computer-aided design and computer-aided manufacturing (CAD/CAM) has been widely applied in the field of prosthodontics, ranging from digital techniques for impression processes, jaw registration, artificial tooth arrangement and base design, along with base and denture fabrication. However, conventional analog workflows are still used and digital workflows have not completely replaced analog workflows. Purpose: Knowing the latest complete digi-tal workflow in the manufacture of removable partial dentures (RPD). Methods: Full-arch digital impressions of the partially edentulous jaw were made with an intraoral scanner or by conventional methods. The denture framework, artificial teeth, and denture base were designed by commercially available CAD software. Each of the denture components including connectors, clasps, and artificial teeth and the denture bases were fabricated separately by the CAM machine, and then assembled using an adhesive material. Conclusion: RPDs were successfully fabricated using a fully digital workflow and no clinical complications were reported.

PERI-IMPLANTITIS IN DENTAL IMPLANTS PLACED IN AUGMENTED BONE: A CASE REPORT.

Introduction: Periimplantitis is a disease most commonly affecting dental implants placed in patients with a history of periodontal disease. It is still questionable if native bone is more resistant to periimplantitis than regenerated bone. Case presentation: A case of dental implant placed in regenerated bone in a patient with treated periodontal disease is presented. The patient is a male healthy adult, who lost the tooth #11 due to advanced periodontal disease. 4 weeks after tooth extraction, the alveolar ridge was augmented and the dental implant was placed 5 months after the guided bone regeneration. The dental implant was restored 3 months after placement. The patient was compliant with the periodontal recall appointments for 2 years. After a personal crisis, the patient neglected his oral hygiene and failed to follow his periodontal recall visits for 7 years. When he finally presented for a dental examination, the dental implant #11 showed significant bone loss and periodontal tissue inflammation. The site was treated conservatively and surgically treated and augmented-with a combination of xenograft, allograft and a collagen membrane-in order to achieve re-osseintegration. Conclusions: Patients with periodontal disease are at high risk for peri-implantitis. Regular recall visits are essential for maintenance of dental tooth and implant health, since treatment of peri-implantitis is a very demanding procedure.

Comparison of marginal bone loss of dental implants and adjacent teeth in the same interproximal unit: a retrospective study with follow-up over 2 years after prosthesis delivery

Comparison of marginal bone loss of dental implants and adjacent teeth in the same interproximal unit: a retrospective study with follow-up over 2 years after prosthesis delivery

The Neutral Zone Approach with CAD-CAM Record Bases.

Lack of adequate retention, support, and stability in the complete denture can be attributed to a poor fit or incorrect shape of the polished surfaces. This article presents a case using the neutral zone technique effectively with the fabrication of computer-aided design and computer-aided manufacturing (CAD-CAM) record bases in an edentulous patient with severely resorbed alveolar ridges and discusses the overall treatment steps and clinical implications of this technique. A stable neutral zone and an accurate jaw relation were recorded using CAD-CAM record bases and stability of complete denture was optimized by arranging denture teeth and reforming polishing surfaces in the neutral zone. A new complete denture was fabricated for a patient with atrophic alveolar ridges by a technique utilizing the neutral zone with CAD-CAM record bases.

Impact of oral disease and disorders on Oral Health-Related Quality of Life of Brazilian football athletes: a cross-sectional study

Introduction: The athletes who practice sports routinely are exposed to the onset of numerous diseases. Objective: To evaluate oral conditions and their impact on oral health-related quality of life (OHRQoL) in Brazilian football athletes using OHIP-14 questionnaire. Methods: In this cross-sectional study, after sample calculation, football athletes were recruited in Rio de Janeiro, Brazil. Clinical and non-clinical data were collected. Psychometrics properties from OHIP-14 were assessed and the student’s T-test was used to evaluate the associations. Results: From 45 football athletes recruited, after applying the eligibility criteria, 34 athletes were included. The most frequent oral conditions observed were dental erosion (85.3%) and malocclusion (85.3%). OHIP-14 had satisfactory properties (α of Cronbach = 0.80 and test-retest/ICC = 0.90). The mean of impact on OHRQoL was 2.79 (± 3.98). There were association of OHIP-14 total score (p=0.01) and the physical pain subscale (p&lt;0.05) for tooth sensitivity, psychological discomfort subscale for dental caries (p=0.01), physical pain subscale (p=0.04) and psychological disability (p=0.01) for malocclusion. Conclusions: The most prevalent oral conditions in athletes were dental erosion and malocclusion. Dental caries, malocclusion and tooth sensitivity were most likely to impact OHRQoL. The OHIP-14 is a satisfactory instrument to detect impact on OHRQoL in Brazilian athletes.

Wear of Modern Denture Teeth—A Systematic Review

The purpose of this systematic review was to identify the different methods used to measure artificial teeth wear and to determine which denture teeth (or which combination of tooth types) have better wear resistance. The focused patient, intervention, comparison, and outcome (PICO) question for this review was “which available denture teeth or combination of teeth have higher wear resistance?” The method of testing and measuring the artificial teeth wear was also evaluated as a secondary outcome. We searched OVID Medline, PubMed and SCOPUS using the following terms (MeSH words) with any synonyms and closed terms: “wear”, “denture teeth”, “denture tooth”, or “artificial tooth”, “tooth wear”, or combination of “denture tooth wear”. Database searches were limited to the English language and studies published between years 1997 and 2021. Further hand searches were carried out of studies identified from the bibliographies of relevant articles. The electronic data base search identified 293 articles of which 213 were eliminated after removing duplicates and screening the titles of the articles. A further 31 articles were eliminated upon application of the exclusion criterion and full text reading because they were either not in the English language or were review articles. Only 41 articles met the inclusion criterion; along with addition of one hand search article, a total of 42 articles were included in the review. The studies showed that rate of denture teeth wear is influenced by factors such as the material and composition of the artificial teeth, the denture tooth antagonist, the tooth being replaced, patient’s age and sex, the type of removable prosthesis and the amount of the superficial layer removed during occlusal adjustments. The testing parameters were inconsistent across all studies. In conclusion, artificial teeth of same material should be used as antagonists where possible, and the superficial outer layer of the teeth must be preserved as much as possible during occlusal adjustments to enhance wear resistance. Denture teeth should be selected taking into consideration the tooth being replaced, the age and sex of the patient, and the type of prosthesis. Incorporation of nano fillers into acrylic resin teeth does not increase wear resistance; therefore, there is no evidence to favour the use of nano-filled composite teeth over micro-filled or conventional acrylic resin teeth.

Additive Manufacturing for Complete Denture Fabrication: A Narrative Review.

To evaluate and compare the benefits and limitations of additive manufacturing for complete denture fabrication. A PubMed and Google Scholar search for topics pertaining to additive manufacturing for complete dentures was performed. The resulting articles were then divided into topics to allow a narrative review. Determining how printing compares with conventional and milled dentures is critical for the widespread adoption of this fabrication technique. Physical properties, denture tooth bond strength, denture base adaptation and soft-liner bond strength are discussed to establish how printing compares. Printing offers many advantages over milled and conventionally processed dentures; however, many questions need to be answered by research. The advantages include reduced cost of most printers compared to milling machines, less material waste, ability to print multiple dentures simultaneously, and complex designs can be fabricated that otherwise could not be milled. Current research has shown flexural strength, fracture toughness, color stability, and denture base adaptation are reduced for printed dentures when compared with milled dentures. Print orientation has been shown to influence accuracy, strength, surface roughness and C. albicans adherence which is not seen with conventional or milled denture materials. These factors do not represent a criticism of printing but rather indicate the need for more research with this new and promising denture fabrication technique. Since printing offers numerous benefits to complete denture fabrication it is likely to have a more significant role in complete denture fabrication in years to come as knowledge increases and materials/techniques continue to advance.

Transformation of preclinical education with a digital platform using progressive learning modules on denture teeth arrangement.

Transformation of preclinical education with a digital platform using progressive learning modules on denture teeth arrangement.

A Study to Determine the Correlation between the Intercondylar and Interdental Widths in South Indian Population: A Cross-sectional Study

Anatomical landmarks that remain fairly constant throughout an individual's life help determine the position of the artificial teeth closer to that of their predecessors. The aim of the present study was to evaluate whether there is a relationship between the intercondylar widths (ICWs) and the interdental widths (IDWs) in the maxillary and mandibular arches in dentate subjects. The study was conducted in two parts, with 80 dentate subjects in total. Initially, in the first 40 subjects, a mathematical index was obtained by dividing the mean ICWs by the mean IDWs. In the second part, the ICW was measured and was used along with the index obtained in the first part, to estimate the IDW. These estimated values were then verified with the real IDWs by direct intraoral measurements. An arbitrary earpiece facebow (ARTEX® Gesichtsbogen Facebow) was used to measure the ICW. Statistics was done using SPSS software version 18 using Karl Pearson's correlation test and paired t-test. The IDW was correlated to the ICW; the maximal correlation was found between ICW and lower 6-6 width (L6-6W) (p value 0.033) and the lowest correlation was found between ICW and upper 6-6 width (U6-6W) (p value 0.046). ICW can be used as an additional guide to position denture teeth. This method suggested would result in a better buccolingual positioning of the posterior teeth, which would help avoid encroaching on the tongue space, thereby improving phonetics and speech with dentures. ICW bears a relationship with the IDWs in the maxillary and mandibular arches. ICW being a fairly constant anatomical landmark can be used as an additional guide aid in positioning the artificial teeth.

Improving wear resistance of acrylic resin denture teeth by using zirconia complete crowns fabricated with a CAD-CAM double-scanning method: A clinical report

Acrylic resin denture teeth can wear and chip when opposed by zirconia prostheses. This clinical report describes the use of zirconia complete crowns to prevent these problems. The predictability of treatment was improved by using the computer-aided design and computer-aided manufacturing (CAD-CAM) double-scanning method.

Neutral Zone: Concept and Technique Application for Managing Severely Resorbed Mandibular Ridges – A Case Report

Abstract: Full dental prosthesis rehabilitation on flat mandibular ridge has been a difficult case for clinicians for a long time. A huge resorption of mandibular ridge results in inadequate retention, and tounge muscle pressure, as well as lip and cheek muscles, causing a decrease in denture’s stability and retention. Neutral zone is a potential area or position where lips and cheek on one side, and tounge on the other side have balance pressure. We reported a 60-year-old male patient with chief complaints of difficulty in mastication, and loose upper and lower dentures. He also complained of denture moving during swallowing and speaking. In case management, the aim was to acquire optimum stability of the denture and arrangement of the mandibular teeth in full dental prosthesis guided by using the neutral zone. Preliminary impression was done by using alginate, then, horizontal and vertical jaw relation was recorded by using bite rim. Suction method impression technique was used to acquire functional impression. Lower denture teeth arrangement adapted the result of neutral zone impression. Acrylic denture was being contoured to adjust the natural anatomy of the oral cavity. In conclusion, the patient got a new full denture with maximum retention and stability while speaking as well as masticating. This article discussed about making of full dental prosthesis with pressure point on neutral zone impression technique on flat mandibular ridge caused by huge resorption.Keywords: flat mandibular ridge; denture stability; neutral zone; impression technique

Color Stability of Different Denture Teeth Following Immersion in Staining Solutions.

Objectives: This study aimed to assess the color change (∆E00) of 7 brands of denture teeth (conventional acrylic and composite teeth) following immersion in staining solutions. Materials and Methods: Maxillary central incisor denture teeth made of 4 conventional acrylic resins (Vitapan, SR Vivodent PE, Beta Star and Crystal) and 3 composite resins (Finex, Emeral and Phonares II) were randomly divided into four groups (n=5). Denture teeth of different brands were immersed in tea, coffee, cola, and turmeric solutions. The solutions were incubated at 37°C. The baseline color of the teeth was measured using an intraoral spectrophotometer. The color of the teeth was measured after 24 h (∆E12), 1 week (∆E13), 2 weeks (∆E14), and 1 month (∆E15). ∆E00 was calculated and analyzed using one-way ANOVA. Pairwise comparisons were performed by the Tukey’s post-hoc test (P<0.05). Results: The color stability of all teeth was significantly affected by the solutions (P<0.001). The type of tooth and coloring solution had significant interactions at all times (P<0.05). Turmeric caused the maximum color change in all teeth after 1 month. Repeated measures ANOVA showed that ∆E00 of all teeth was significantly affected by the duration of immersion in the solutions (P<0.001). Conclusion: within the limitations of this study, 1-month immersion of denture teeth in coffee, tea and cola solution altered the ∆E values; however, they were within the acceptable range, except for Beta Star. Turmeric solution caused unacceptable color change in all denture teeth even after 24 h of immersion.