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Item Incidência de complicações protéticas associadas a três tipos de tratamento com implantes para o edentulismo mandibular: estudo de coorte com três anos de acompanhamento(Universidade Federal de Goiás, 2021-09-24) Araújo, Sara Cristina de; Leles, Cláudio Rodrigues; http://lattes.cnpq.br/6740286066154410; Leles, Cláudio Rodrigues; Bernardino, Ítalo de Macedo; Hartmann, Roberto; Costa, Nádia do Lago; Jordão, Lídia Moraes RibeiroObjectives: This prospective cohort evaluated the incidence of prosthetic complications, number and reasons for post-insertion visits during a three-year follow-up period of fully edentulous patients rehabilitated with complete maxillary dentures opposed to a mandibular overdenture retained by one or two implants, or a fixed hybrid prosthesis retained by four implants. Materials and Methods: Participants were individuals who participated in a randomized clinical trial comprising three treatment groups: Group I: overdenture retained by one implant (n=11); Group II: overdenture retained by 2 implants (n=13); and Group III: fixed prosthesis retained by 4 implants (n=13). A total of 37 patients were followed-up for a period of 3 years after insertion of the implant-assisted prostheses. Data were collected prospectively concerning the occurrence of prosthetic complications, number of scheduled or unscheduled visits, clinical duration of the appointments for clinical resolution of prosthetic complications. Results: The total number of unscheduled visits per patient ranged from 0 to 7 (mean = 2.41; SD = 2.2) throughout the 3-year follow-up period. No differences were found between the three groups regarding the number of patients who required unscheduled visits. The clinical time of appointments (scheduled and unscheduled) was longer for the G-III (p <0.001) when compared to the overdenture groups. The incidences of prosthetic complications for the overdenture groups (G-I and G-II) were higher compared to G- III (p<0.001). Most of the complications that occurred in G-I and G-II were matrix replacement due to loss of retention of mandibular overdenture due to wear of the retentive inserts (38.3% of patients/year). Fracture of artificial teeth was the most common complication in G III (30.8%). On the other hand, as fixed prostheses, they spend more clinical time to solve their complications. Conclusion: All the three treatment options required maintenance recall visits to ensure their function and longevity. Overdentures had a higher incidence of prosthetic events compared to fixed mandibular prostheses. On the other hand, fixed prostheses require more clinical time to solve their complications.Item Overdenture mandibular retida por implante unitário: desfechos clínicos, radriográficos e reportados pelo paciente após 5 anos de acompanhamento(Universidade Federal de Goiás, 2020-01-09) Coutinho, Paula Cristina; Nogueira, Túlio Eduardo; http://lattes.cnpq.br/5622401475518280; Leles, Cláudio Rodrigues; http://lattes.cnpq.br/6740286066154410; McKenna, Gerald John; Dias, Danilo Rocha; Leles, Cláudio RodriguesObjective: To assess clinical, radiographic, and patient-reported outcomes of edentulous individuals rehabilitated with single-implant mandibular overdenture (SIMO) a 5-year follow-up period. Methods: A prospective clinical study was performed including edentulous individuals who received new conventional complete dentures and then an external hexagon implant (Neodent, Brazil) was placed in the mandibular midline region followed by the incorporation of a retention system (ball attachment/O'Ring, Neodent, Brazil). Data collection occurred at baseline and after 3, 6, 12, 24 and 60 months after implant loading. Outcomes included were implant stability, peri-implant soft tissue condition, periimplant marginal bone level, satisfaction with the dentures, and oral health- related quality of life impacts (OHRQoL). Also, clinical maintenance events related to the dentures were recorded. Descriptive statistics and Wilcoxon Signed Ranks Test were used for data analysis. Results: 30 out of 34 eligible participants attended the 5-year follow-up, mea age 68.1 years (SD = 7.8), 70% women. The overall implant survival rate was 95.3%. After 5 years, the OHRQoL showed a statistically significant difference between all evaluation periods compared to the baseline. There were no statistically significant differences regarding satisfaction with the maxillary prosthesis (p = 0.068) compared to the baseline period. Regarding satisfaction with the mandibular denture, there was a statistically significant difference between all evaluation periods, except for the 60-month evaluation (p = 0.213). There was an increase implant stability after 60 months and a decrease in periimplant bone level, but within expectations. The most frequent maintenance event was the O'ring matrix replacement (n = 80), followed by the repair of the denture base (n = 21). The most frequent intervention was replacement of the O'ring matrix (n = 80), followed by repair at the base of the prosthesis (n = 21). Besides, the peri-implant soft tissue condition remained stable. Conclusion: SIMO is effective in the long-term period considering the maintenance of the positive effect of the intervention in the patient-reported outcomes, the high implant survival rate, stable peri-implant condition and the occurrence of a usual number and type of maintenance events.Item Sobrevida e desfechos periimplantares de overdentures mandibulares retidas por quatro mini implantes de titânio-zircônia: ensaio clínico randomizado de um ano de acompanhamento(Universidade Federal de Goiás, 2023-02-15) Curado, Thalita Fernandes Fleury; Leles, Cláudio Rodrigues; http://lattes.cnpq.br/6740286066154410; Leles, Cláudio Rodrigues; Oliveira, Camila Alves Costa de; Mello, Caroline Cantieri deMandibular overdenture is considered the standard treatment for completely edentulous patients, with excellent cost-effectiveness and high success rates. The traditional technique consists of installing two implants of conventional diameter, its use being limited in very resorbed ridges with reduced thickness. Mini-implants are small-diameter implants that have recently been used to retain overdentures with satisfactory success rates. The aim of this study is to evaluate the survival and peri-implant outcomes of a mini-implant system for overdenture retention and the influence of surgical and loading protocols performed. The present study consists of a 2x2 factorial randomized clinical trial where 74 total edentulous participants underwent the installation of four mini-implants for overdenture retention in the mandibular interforaminal region, totaling 296 mini-implants. They were randomized into four groups according to the surgical protocol and prosthesis loading: Immediate/Flapless = 17 (23.0%); Immediate/Flapped = 18 (24.3%); Delayed/Flapless = 20 (27.0%); and Delayed/Flapped = 19 (25.7%). Most participants (64.9%) were female and the mean age at surgery was 64.1 ± 8 years. The survival rate during the 1-year follow-up was 100%. No major biological complications were observed, such as abnormal marginal bone loss or sulcus depth. The plaque index remained stable at the follow-ups (3, 6 and 12 months after capture) while the bleeding index significantly reduced at the 6 and 12 months follow-ups compared to the baseline index (3 months). Probing depth and gingival margin height remained stable over the follow-up periods. The mean overall marginal bone loss was 0.68 (±0.68) mm after three months and 0.89 (±0.75) mm after one year. The flapless protocol showed better results in stability and soft tissue health and a slightly higher risk of marginal bone loss. The findings suggest that the mandibular overdenture retained by this new mini-implant system is a safe and predictable treatment option with regard to implant survival and peri-implant outcomes, even when flapless surgery and immediate loading are adopted.Item Incidência de eventos de manutenção relacionados à matriz de retenção em overdentures mandibulares retidas por um ou dois implantes e diferentes sistemas de retenção(Universidade Federal de Goiás, 2021-06-30) Melo, Patrick Borges de; Nogueira, Túlio Eduardo; http://lattes.cnpq.br/5622401475518280; Leles, Cláudio Rodrigues; http://lattes.cnpq.br/6740286066154410; Leles, Cláudio Rodrigues; Cruvinel, Diogo Rodrigues; Hartmann, RobertoTo assess the incidence of maintenance events related to retention matrices of totally edentulous individuals rehabilitated with mandibular overdentures retained by one or two implants, with Neodent branded spherical abutment and nylon matrix retention system (groups N1 – 1 implant and N2 – 2 implants) or Straumann branded spherical abutment and metalIC matrix (groups S1 – 1 implant and S2 – 2 implants). Materials and methods: This was a prospective cohort study and included 70 patients (N1=11; N2=13; S1=22; S2=24) who participated in two randomized clinical trials, previously performed at the Center for Research in Prosthodontics and Implant at the Federal University of Goiás (UFG), followed for a mean period of 28.7 months (SD=9.8; 12.0-47.2). Cumulative incidences, incidence densities and time-event estimation using Kaplan-Meier analysis were calculated.Results: The mean number of matrix-related events per participant was 1.33 (SD=1.25, 0-6), with a significantly higher incidence of matrix replacement (p<0.001) in nylon matrix overdenture wearers. The classification of the type of visit (scheduled or non-scheduled) was similar in participants with 1 or 2 implants (p=0.267). Visits to replace the retention matrix occurred during unscheduled appointments in 63.6% of the total events, and 36.4% during scheduled appointments (p=0.015). There was no statistically significant difference in retention matrix events (replacements and activations) between participants with overdenture retained by 1 or 2 implants (p=0.864). Time to occurrence of matrix exchange was similar among participants treated with overdenture retained by 1 or 2 implants (p=0.924). There was no significant difference in the total number of matrix events in relation to the number of implants during the follow-up period (p=0.710). The retention system with metallic matrix (groups S1 and S2) showed superior performance compared to the nylon matrix (groups N1 and N2), with a statistically significant difference (p=0.009). Conclusion: There was no statistically significant difference in the incidence of maintenance events related to the matrix between the groups. There was a significantly higher number of events in the nylon matrix group, regardless of the number of implants used to retain the mandibular overdenture.Item Desenvolvimento e implementação de uma escala de autoeficácia em saúde oral para usuários de overdenture mandibular(Universidade Federal de Goiás, 2023-11-06) Moore, Steven Kadeem; Leles, Cláudio Rodrigues; http://lattes.cnpq.br/6740286066154410; Leles, Cláudio Rodrigues; Srinivasan, Murali; Nogueira, Túlio EduardoIntroduction: Self-efficacy, a concept coined by Albert Bandura, refers to an individual's belief in their ability to perform behaviors necessary to achieve specific performance goals. In the context of oral health, self-efficacy plays a pivotal role in influencing behaviors related to oral hygiene practices. Objective: This study aimed to develop an oral health self-efficacy scale and evaluate the relationship between oral health self-efficacy and the peri-implant health status of individuals using implant-retained overdentures. Materials and Methods: This was a cross-sectional observational study nested within a clinical trial at the Prosthesis and Implant Research Center (NPPI) at the Federal University of Goiás (UFG), Goiânia, Brazil. The project received approval from the Ethics Committee for Research at the Federal University of Goiás. A 25-item questionnaire was developed based on the Dental Self-Efficacy Scale (DSE), revised by a panel of experts, translated into Brazilian Portuguese, and piloted for clarity. The 25-item OHSE-OVER questionnaire collected data across four dimensions: (1) routine challenges – 4 items; (2) self-rated performance – 5 items; (3) attitudes towards oral health – 6 items; (4) challenges in special occasions – 10 items. The questionnaire score was calculated by first reversing the scale of dimensions 1 and 4 and then summing the scores of all dimensions. The final score repre-sented oral health self-efficacy (higher scores indicating greater oral health self-efficacy). The study included patients with mandibular overdentures retained by implants as part of a larger study involving mini-implants. Randomization was based on a surgical approach and loading protocol. All clinical procedures took place at NPPI/UFG, with no cost to the participants. Twelve-month follow-up assessments included pillar plaque evaluations, peri-implant bleeding, and denture surface plaque. A single clinician conducted clinical assessments for all patients and administered the Oral Health Self-Efficacy Evaluation for Overdenture Users (OHSE-OVER) questionnaire in an interview format during evaluation. Clinical data were compared with OHSE-OVER questionnaire responses. Statistical analyses, including Confirmatory Factor Analysis and regression, were conducted using IBM-SPSS 22.0 and Mplus 8.8 software, with a significance level of p < 0.05. Results: Out of the initially invited 74 patients, 69 participated in the study. Among them, the majority were female (63.8%), aged between 36 and 81 years (mean = 65.0; SD = 8.1), with nearly half being current or ex-smokers (47.8%), and most were taking regular medication (82.6%). Self-efficacy scores varied across different dimensions, with an overall mean score of 2.35. The scale demonstrated good reliability (Cronbach's alpha = 0.799). Con-firmatory factor analysis supported the four-factor model, with the removal of two items due to their low factor loadings. Regression analysis revealed that higher self-efficacy was linked to better denture hygiene outcomes in the overall scale, a positive association between oral health self-efficacy and sex(male), as well as an inverse relationship between oral health self-efficacy and plaque index in dimensions 1 and 2, respectively. No significant associations were observed in dimensions 3 and 4. Conclusion: The research underscores the fundamental role of self-efficacy in determining oral health outcomes in individuals using implant-retained overdentures. It establishes a significant association between oral health self-efficacy and key oral hygiene indicators, such as plaque index and denture hygiene, in patients relying on implant-retained overdentures. Additionally, the validation of the OHSE-OVER's psychometric robustness and internal structure reinforces its efficacy as a valuable instrument specifically developed to assess and address oral health self-efficacy in patients with mandibular overdentures, both in clinical and research contexts.Item Avaliação clínico-radiográfica e estabilidade implantar em overdenture mandibular retida por implante unitário(Universidade Federal de Goiás, 2014-04-03) Nogueira, Túlio Eduardo; Leles, Cláudio Rodrigues; http://lattes.cnpq.br/6740286066154410; Leles, Cláudio Rodrigues; Ribeiro-Rotta, Rejane Faria; Marra, JuliêObjective: To conduct a longitudinal evaluation of marginal bone loss, peri-implant aspects and stability in single implant used to retain mandibular overdenture, and to evaluate outcomes related to the overdenture. Methods: Forty-five completely edentulous individuals were treated using mandibular overdenture retained by a single implant (Titamax IT Cortical, Neodent, Curitiba, Brazil) opposed to conventional dentures. According to the primary stability obtained in the implant placement patients were treated with an immediate loading protocol when torque was at least 30 Ncm and implant stability quotient (ISQ) at least 60. In cases of values below cited conventional loading protocol were adopted. O’Ring attachment system from two different commercially available companies were used and allocated systematically between subjects. Follow-up evaluations were performed immediately and at 3 and 6 months after implant placement, when parameters related to implant stability, periimplant tissue aspects, implant survival rate and need for the maintenance of the overdenture were noted. Results: 38 (84.4%) of 45 patients received immediate loaded implants. Implant failure occurred in 3 cases, 2 of them in the conventional loading group (early loss before implant loading). There was an increase in ISQ values in subsequent periods after implant placement, evidenced between baseline and 6 months (p=0.004) and between 3 and 6 months (p<0.001). The mean marginal bone loss at follow-up was 0.50 mm (SD=0.66). It was observed gradual reduction of the gingival height up to 6 months (p=0.006), as well as progressive reduction in plaque index (p=0.028) and bleeding on probing (p=0.021). There was no difference in clinical condition concerning the attachments that were compared. However, Neodent attachments showed better clinical performance and lower replacement rates (p=0.014). Conclusion: This clinical study suggested that the single implant-retained mandibular overdenture is a feasible treatment for mandibular edentulousness, showing favorable clinical and radiographic periimplant outcomes as well as maintenance of the implant stability.Item Efetividade de um protocolo de tratamento simplificado com próteses totais sobre a satisfação dos pacientes com as próteses e qualidade de vida relacionada à saúde bucal(Universidade Federal de Goiás, 2011-12-12) Nuñez, Margaret Catherine Olivera; Leles, Cláudio Rodrigues; http://lattes.cnpq.br/6740286066154410; Leles, Cláudio Rodrigues; Souza, Raphael Freitas de; Freire, Maria do Carmo MatiasThe replacement of conventional dentures can result in potential functional and aesthetic benefits to the patient. Previous studies suggest that simplified procedures for complete dentures (CD) construction achieve results similar to the traditional methods. The objective of this study was to compare the effectiveness of a traditional and a simplified protocol for construction of conventional complete dentures. Fifty patients were randomly allocated into two equal groups, traditional protocol (T group) and simplified protocol (S group). Treatment outcomes were assessed before the installation of the new prosthesis and 30 days after the last adjustment, including measurements of quality of life related to oral conditions measured by the Brazilian version of OHIP-Edent scale and patients’ satisfaction with the upper and lower dentures using a visual analogue scale (VAS), which combines the patient's perception in relation to overall satisfaction with the comfort, stability, ability to chew, ability to talk and aesthetics. The results showed an overall 33.3% reduction in negative impacts of oral conditions on quality of life (p<0.001) and improved satisfaction with the upper and lower dentures (p<0.01). Quality of life improvement occurred in all dimensions of the OHIP-Edent (p<0.001). Despite the significant reduction in quality of life impacts and significant increase in patients’ satisfaction with the dentures, there were no differences between the traditional and simplified protocols. It was concluded that the simplified protocol results in perception of treatment outcomes similar to the traditional protocol.Item Teste de Apresentação da Prótese (TAP): avaliação de um novo teste para triagem de comprometimento cognitivo em usuários de próteses totais(Universidade Federal de Goiás, 2021-12-17) Oliveira, Talitha Marica Cabral; Srinivasan, Murali; Leles, Cláudio Rodrigues; http://lattes.cnpq.br/6740286066154410; Leles, Cláudio Rodrigues; Paula Júnior, Delcides Ferreira de; Dias, Danilo RochaDuring the 2019 General Session of The International Association for Dental Research (IADR), Srinivasan et al. suggested a new screening test for cognitive impairment in elderly people rehabilitated with a prosthesis. The Test entitled ‘Prosthesis Presentation Test [PPT]’ the expected action was that the participants correct the orientation of the prostheses and insert them correctly. However, the authors suggested that other studies and protocols be adapted and carried out to explore the objectives of this test. Aim: To establish a protocol for the performance of the Prosthesis Presentation Test in Portuguese “Teste de Apresentação da Prótese” (TAP) and its applicability in the elderly population and test the correlation between the TAP and sociodemographic variables, measures of cognitive function and disability. Methods: This is a cross-sectional observational study with participants using Conventional dentures who underwent a new test (TAP) in 4 different presentations to assess their cognitive performance. Correlations were calculated between the sums of the TAP scores and the independent variables, these being Activities of Daily Living (ADL) and Instrumental Activities of Daily Living (IADL) and Cognition (Mini-Mental and Mini-Cog) through the correlation coefficient Spearman and p-value, a generalized linear model was also used Results: The sample consisted of 57 (63.3%) females and 33 (36.7%) males. The mean age was 66.7 (SD = 8.1). Regarding the assessment of Cognition by the Mini-Cog, it identified 53 (58.9%) participants with a negative assessment. For evaluation in relation to the MMSE, 69 participants (76.7%) presented mild impairment, and 21 (23.3%) presented moderate impairment and none presented severe impairment. For the independence measures, the ADL showed that 64.4% of the sample is independent, compared to the IADL 41.1% of the sample is independent. Spearman's correlation coefficient showed that Mini-cog (p = 0.003) and MMSE (p = 0.019) and IADL scores (p = 0.003) were correlated with age. There was also a strong correlation between Age and PPT inboth the position of the prosthesis and the arch (p = 0.004) and (p = 0.031) and of the IADL in relation to PPT / Position (p = 0.044). The generalized linear model showed that the increase in TAP scores was associated with increasing age and a reduction in the chance of a better TAP score was inversely associated with the number of tests performed. Conclusions:Have a strong association between TAP and age and IADL score. Increased TAP scores were associated with increasing age. TAP is an easy-to-perform test that is applicable in clinical routine.Item Ensaio clínico randomizado do tratamento com overdenture mandibular retida por um e dois implantes: avaliação de desfechos clínicos, radiográficos, percepção do paciente e análise de custos(Universidade Federal de Goiás, 2019-07-03) Resende, Gabriela Pereira de; Leles, Cláudio Rodrigues; http://lattes.cnpq.br/6740286066154410; Leles, Cláudio Rodrigues; Souza, João Antônio Chaves de; Paula, Wagner Nunes deThe objective of this study was to perform a randomized clinical trial of two treatment alternatives for the rehabilitation of mandibular edentulism: mandibular overdenture retained by one implant (OVD-1) and mandibular overdenture retained by two implants (OVD-2). A total of 47 edentulous participants were included, allocated to one of the treatment groups. All patients received Standard Plus SLActive® implants (Straumann, Switzerland) installed following the 21-day conventional loading protocol. Primary outcomes involved patient satisfaction with the treatment and impact of oral health on quality of life. Secondary outcomes involve masticatory performance, pain, implant stability (ISQ), marginal bone pattern, peri-implant and aspects of the tissue, clinics and overdenture maintenance events, and the costs that were identified, measured and valued for one year after the treatment. The Wilcoxon, Anova mixed and GEE tests were used to compare the different study groups. The patients underwent a genetic improvement program (p> 0.05), performance masticatory (p = 0.924), related pain (p = 0,491), ISQ (p = 0.128). Bone markers were marginal at 0.31 (± 0.70) and 0.12 (± 0.59) for the OVD-1 and OVD-2 groups, respectively, after 12 months, with no differences between groups (p = 0.370). Regarding peri-implant areas and molar tissue, clinics and overdenture maintenance events were not regretted when compared to statistically significant (p> 0.05). However, it was able to make the difference between the groups in relation to the total time of treatment (p = 0.001), and in relation to the costs that this figure presented in the surgical phase (p = 0.004) and in the prosthetic phase (p <0.001) , representing an incremental cost of R$ 1230.13 for OVD-2 treatment. The results were that the treatments with two implants are equivalent, and the use of a single implant can be a viable alternative for cost reduction and treatment invasiveness.Item Incidência de desfechos protéticos associados à overdenture mandibular retida por quatro mini-implantes: estudo prospectivo aninhado a ensaio clínico randomizado(Universidade Federal de Goiás, 2023-10-20) Silva, Jésio Rodrigues; Leles, Cláudio Rodrigues; http://lattes.cnpq.br/6740286066154410; Leles, Cláudio Rodrigues; Roriz, Virgílio Moreira; Hartmann, RobertoThe use of mini-implants is gaining popularity due to less surgical complexity and advantages for cases of atrophic mandibles, and a new system of mini-implants was recently launched (Straumann Optiloc Mini-Implant System®). Aim: This prospective study is part of a randomized clinical trial and aimed to evaluate the incidence of prosthetic outcomes and associated factors in completely edentulous patients after the insertion of mandibular overdentures retained by four mini-implants. Methods: Completely edentulous individuals using conventional complete dentures were recruited for the installation of four mini-implants for treatment with mandibular overdenture. The study combined two surgery protocols (flapped or flapless) and loading (immediate or delayed). During follow-up, the incidence of prosthetic complications and maintenance events were recorded at scheduled and unscheduled appointments. Independent variables were considered as age, gender, surgery and loading protocol, and ridge form (CAWOOD & ROWEL, 1988). A classification of prosthetic outcome (six-field protocol) (PAYNE et al., 2001) was assessed at the end of the follow-up period. Descriptive statistical analysis was performed, with measurements of incidence rates, as well as Kaplan-Meier survival analysis and Cox regression, considering the significance level of p<0.05. Results: 74 participants were accompanied, with a mean age of 64 years (35-80 years), and total follow-up time varied between 19 and 26 months. There were a total of 182 prosthetic events in 147 consultations, 88 of which (59.87%) were unscheduled. The most frequent event was the need for minor adjustments to the base of the overdenture (incidence of 38), due to sore spots; followed by minor repairs at the base (incidence of 16); total (incidence of 21) or partial (incidence of 11) exchange of matrices; indirect relining (incidence of 21) due to instability; new intraoral capture (incidence of 8); fracture of the overdenture (n = 1) and tooth fracture (n = 1). The outcome of success was attributed to 69 participants (93.2%). The most significant predictor for the incidence of adjustments was the flapless surgery protocol (p=0.011), and the age was the most one for the incidence of total matrix replacement (p=0.031). There was no statistically significant difference in the incidence of other prosthetic complications with regard to gender, loading protocol, or ridge form (p>0.05). Conclusions: There was a high incidence of prosthetic events, but they were considered acceptable and mostly represented by small adjustments or repairs to the overdenture base in the initial period of treatment. The high survival and success rate of the implant and prosthesis shows that this is a favorable treatment option for this follow-up, and it is recommended to establish scheduled appointments for the expected events. Longer follow-ups are recommended to obtain more representative data regarding prosthetic outcomes.Item Validação do teste de habilidade de mistura com goma de mascar de duas cores para avaliação da performance mastigatória em usuários de próteses totais(Universidade Federal de Goiás, 2017-03-20) Silva, Lorrany Cândido da; Leles, Cláudio Rodrigues; http://lattes.cnpq.br/6740286066154410; Leles, Claúdio Rodrigues; Torres, Érica Miranda de; Marra, JuliêObjective: To test the validity and reliability of a method to measure the masticatory performance of complete denture wearers employing a two-colour gum mixing ability test through visual and opto-electronical analysis. Material and Methods: A sample of 75 subjects was selected from patients who received new conventional tissue-supported complete dentures in a clinic at the Federal University of Goiás. Masticatory tests were performed using a two-colour chewing gum that was masticated for 5, 10, 20, 30 and 50 chewing cycles, performed in a random order. The mixing level of the two colours of the chewed gum was assessed visually by two independent raters based on a 5-point ordinal scale. Then, the specimens were flattened into a 1 mm width wafer, scanned and saved as a two-sided digital image. Each pair of images was submitted to a colourimetric analysis using a custom-made software (ViewGum©, Dhal Software, Greece). The circular variance of hue (VOH) was used as a measure of the level of the colour mixture. The lower is the VOH, the greater is the mixture and, consequently, the masticatory performance. In the current study design, a varying number of chewing cycles simulated different levels of masticatory performance in one subject. The intra and inter-examiner agreement for the visual analysis was measured by the intraclass correlation coefficient and the weighted Kappa. The reliability of VOH analysis was assessed using the Bland-Altman plots. Results: Overall inter and intra-rater agreement in visual analysis was 64% and 68%, respectively (almost 99% of scores ranged within ±1 point). Overall weighted kappa was >0.80 and intraclass correlation coefficient was 0.91. A proportional increase in the level of mixture occurred with increased number of chewing cycles for both the visual and colourimetric analysis (p<0.001). Similarly, VOH and the visual 12 analysis were highly correlated (r= -0.89; p<0.001). Bland-Altman plots revealed excellent agreement and extremely low systematic error between duplicated VOH measures. Conclusion: The two-colour chewing gum test is a valid and reliable method for assessment of the masticatory performance in complete denture wearers using both the visual and electronic colourimetric analysis.