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Patil R, Khubchandani M, Kanani H, Yeluri R, Dangore-Khasbage S. Unravelling the Complexities of Bite Force Determinants in Paediatric Patients: A Literature Review. Cureus 2024; 16:e60630. [PMID: 38903313 PMCID: PMC11187438 DOI: 10.7759/cureus.60630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2024] [Accepted: 05/19/2024] [Indexed: 06/22/2024] Open
Abstract
The amount of maximum voluntary bite force (MVBF) is determined by the combined action of the jaw elevator muscles, which are altered jaw biomechanics and reflex processes. Bite force (BF) measurements can yield valuable information on the activity and function of the jaw muscles. The accuracy of biting force measurements depends on several variables, including age, gender, malocclusion, dental caries, dental prostheses and temporomandibular joint (TMJ). This information is essential for evaluating the development and function of the masticatory system, identifying potential abnormalities or impairments and guiding appropriate treatment interventions for paediatric patients. The aim of this article is to review the literature on the factors affecting bite force and the importance of these factors in assessing dental development and guiding interventions for paediatric patients with bite force-related issues. Additionally, establishing normative values for bite force in different age groups can aid in monitoring growth and detecting any deviations from expected patterns. Measuring bite force in paediatric patients is significant in comprehensive oral health assessment and management.
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Affiliation(s)
- Rutuja Patil
- Pedodontics and Preventive Dentistry, Sharad Pawar Dental College and Hospital, Datta Meghe Institute of Higher Education and Research, Wardha, IND
| | - Monika Khubchandani
- Paediatric Dentistry, Sharad Pawar Dental College and Hospital, Datta Meghe Institute of Higher Education and Research, Wardha, IND
| | - Harikishan Kanani
- Paediatric Dentistry, Sharad Pawar Dental College and Hospital, Datta Meghe Institute of Higher Education and Research, Wardha, IND
| | - Ramakrishna Yeluri
- Paediatric Dentistry, Sharad Pawar Dental College and Hospital, Datta Meghe Institute of Higher Education and Research, Wardha, IND
| | - Suwarna Dangore-Khasbage
- Oral Medicine and Radiology, Sharad Pawar Dental College and Hospital, Datta Meghe Institute of Higher Education and Research, Wardha, IND
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Ali Alkhalaf Z, Sghaireen MG, Ganji KK, Alam MK, Issrani R, Mohammed Alsaleh R, Almegren SZ, Gamal Salloum M. Unveiling the Influence of the Curve of Spee on Bite Force and Chewing Ability: A Comparative Study. Int J Clin Pract 2024; 2024:6533841. [PMID: 38420595 PMCID: PMC10901573 DOI: 10.1155/2024/6533841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/25/2023] [Revised: 02/07/2024] [Accepted: 02/10/2024] [Indexed: 03/02/2024] Open
Abstract
Aim To investigate the impact of the curve of Spee (CS) accentuation on bite force, chewing ability, and additionally, other factors that influence chewing ability and bite force such as restorations, caries, gender, habits, and TMJ problems. Materials and Methods 231 participants (118 male and 113 female, mean age = ±27.96 years) were recruited for this cross-section study. Participants completed a data collection sheet in which age, gender, Angle's classification of malocclusion, overjet, overbite, TMJ problems, habits, restorations, and caries experience were recorded. Two examiners made a lower impression, chewing ability test and measured the bite force for each participant. Measurement of the CS was obtained digitally from the poured dental cast, and the categorization was as follows: flat (<1 mm), normal (1-2 mm), or deep (>2 mm). Results The mean maximum bite force (MBF) was 468.722 N for participants with flat CS, 389.822 N for normal CS, 647.08 N for deep CS, and 384.667 N for reverse CS. The average MBF was higher for participants with deep CS (p < 0.05). MBF force was higher in males. However, BMI was not significantly related to MBF values. Participants with normal and flat CS have comparable chewing capacity (p > 0.05). Also, a significant difference in bite force and chewing ability was found between the three categories of CS (p < 0.05). Conclusion Bite force variations across various CS types were linked to gender and habits. Chewing ability showed no differences concerning gender, habits, TMJ problems, caries, or restorations, emphasizing CS's significant impact on bite force while showcasing the unchanged nature of chewing ability amidst diverse factors.
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Affiliation(s)
- Zainab Ali Alkhalaf
- Department of Prosthetic Dental Sciences, College of Dentistry, Jouf University, Sakaka, Aljouf, Saudi Arabia
| | - Mohammed Ghazi Sghaireen
- Department of Prosthetic Dental Sciences, College of Dentistry, Jouf University, Sakaka, Aljouf, Saudi Arabia
| | - Kiran Kumar Ganji
- Department of Preventive Dentistry, College of Dentistry, Jouf University, Sakaka, Aljouf, Saudi Arabia
- Department of Periodontology & Oral Implantology, Sharad Pawar Dental College, Datta Meghe Institute of Higher Education & Research, Sawangi (Meghe), Wardha, India
| | - Mohammad Khursheed Alam
- Department of Preventive Dentistry, College of Dentistry, Jouf University, Sakaka, Aljouf, Saudi Arabia
- Department of Research Analytics, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, India
- Center for Transdisciplinary Research (CFTR), Saveetha Dental College, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, India
- Department of Public Health, Faculty of Allied Health Sciences, Daffodil lnternational University, Dhaka, Bangladesh
| | - Rakhi Issrani
- Department of Preventive Dentistry, College of Dentistry, Jouf University, Sakaka, Aljouf, Saudi Arabia
- Department of Research Analytics, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, India
| | - Raghad Mohammed Alsaleh
- Department of Preventive Dentistry, College of Dentistry, Jouf University, Sakaka, Aljouf, Saudi Arabia
| | - Sultana Zamil Almegren
- Department of Periodontology and Oral Implantology, Ministry of Health, Dental Clinics Complex West of Riyadh, Laban, Riyadh, Saudi Arabia
| | - Mahmoud Gamal Salloum
- Department of Substitutive Dental Sciences, College of Dentistry & Pharmacy, Buraydah Private Colleges, Buraydah, Saudi Arabia
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Togawa H, Gonda T, Karino T, Maeda Y, Ono T, Ikebe K. Force exerted on maxillary anterior teeth in mandibular unilateral and bilateral distal extension partial edentulous situation. Odontology 2023; 111:451-460. [PMID: 36307615 DOI: 10.1007/s10266-022-00760-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Accepted: 10/18/2022] [Indexed: 10/31/2022]
Abstract
The purpose of this study was to determine the influence of mandibular unilateral and bilateral distal extension partial edentulous situation and the use of removable partial dental prostheses on the force exerted on maxillary anterior teeth. A commercially available jaw model with exchangeable teeth was used. Seven experimental conditions of mandibular distal extension edentulous situation were prepared and a distal extension removable partial dental prosthesis to replace missing posterior teeth was fabricated. The occlusal force was measured by inserting an occlusal force measuring film between the maxillary and mandibular teeth of the model. An occlusal load was applied and the forces and ratios were compared using the Kruskal-Wallis test and the Mann-Whitney U test (p < 0.05). As a result, the force exerted on the maxillary anterior teeth increased significantly as the number of remaining teeth decreased in unilateral and bilateral edentulous situation. The force exerted on the maxillary anterior teeth decreased significantly with use of a removable partial dental prosthesis. It is concluded that when the number of remaining teeth decreases in mandibular unilateral and bilateral distal extension partial edentulous situation, the burden on the maxillary anterior teeth increases. Our findings suggest that for patients with mandibular distal extension partial edentulous situation, using a removable partial dental prosthesis is effective in preserving the remaining teeth by reducing excessive force.
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Affiliation(s)
- Hitomi Togawa
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka Suita, Osaka, 565-0871, Japan
- Division of Comprehensive Prosthodontics, Niigata University Graduate School of Medical and Dental Sciences, 2-Bancho, Gakkocho-Dori, Chuo-Ku, Niigata, 5274951-8514, Japan
| | - Tomoya Gonda
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka Suita, Osaka, 565-0871, Japan.
| | - Takeshi Karino
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka Suita, Osaka, 565-0871, Japan
| | - Yoshinobu Maeda
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka Suita, Osaka, 565-0871, Japan
| | - Takahiro Ono
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka Suita, Osaka, 565-0871, Japan
- Division of Comprehensive Prosthodontics, Niigata University Graduate School of Medical and Dental Sciences, 2-Bancho, Gakkocho-Dori, Chuo-Ku, Niigata, 5274951-8514, Japan
| | - Kazunori Ikebe
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, 1-8 Yamadaoka Suita, Osaka, 565-0871, Japan
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Shiga H, Komino M, Yokoyama M, Sano M, Arakawa I, Nakajima K, Fujii S. Relationship between age and occlusal force in adults with natural dentition. Odontology 2023; 111:487-492. [PMID: 36169783 DOI: 10.1007/s10266-022-00750-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Accepted: 09/20/2022] [Indexed: 10/14/2022]
Abstract
This study aimed to clarify the relationship between age and occlusal force in adults with natural dentition. A total of 385 adults (180 males and 205 females) with natural dentition participated in this study. Subjects were asked to perform maximum clenching for approximately 3 s, and the occlusal forces on both sides and habitual chewing side were calculated using a dental prescale. Regression analysis was performed by sex with occlusal forces on both sides and habitual chewing side as the dependent variable and age as the independent variable. In addition, all subjects were divided into three groups: young group (20-39 years), middle group (40-59 years), and old group (60 years and over), and the occlusal forces on both sides and habitual chewing side were compared among the three groups. The occlusal forces did not differ from 20 to 60 years old for both males and females, and the occlusal forces gradually decreased after 60 years old. The curve of the polynomial equation was the most suitable. The occlusal forces on both sides and the habitual chewing side were similar in the young and middle groups, and the values of the old group were significantly smaller than those of the other two groups. From these results, it was suggested that the occlusal force of adults with natural dentition does not differ from 20 to 60 years old and can be represented by a curve of a cubic polynomial, and it significantly decreases after 60 years old.
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Affiliation(s)
- Hiroshi Shiga
- Department of Partial and Complete Denture, School of Life Dentistry at Tokyo, The Nippon Dental University, 1-9-20 Fujimi, Chiyoda-ku, Tokyo, 102-8159, Japan.
| | - Marie Komino
- Department of Partial and Complete Denture, School of Life Dentistry at Tokyo, The Nippon Dental University, 1-9-20 Fujimi, Chiyoda-ku, Tokyo, 102-8159, Japan
| | - Masaoki Yokoyama
- Department of Partial and Complete Denture, School of Life Dentistry at Tokyo, The Nippon Dental University, 1-9-20 Fujimi, Chiyoda-ku, Tokyo, 102-8159, Japan
| | - Mako Sano
- Department of Partial and Complete Denture, School of Life Dentistry at Tokyo, The Nippon Dental University, 1-9-20 Fujimi, Chiyoda-ku, Tokyo, 102-8159, Japan
| | - Ichiro Arakawa
- Department of Partial and Complete Denture, School of Life Dentistry at Tokyo, The Nippon Dental University, 1-9-20 Fujimi, Chiyoda-ku, Tokyo, 102-8159, Japan
| | - Kunihisa Nakajima
- Department of Partial and Complete Denture, School of Life Dentistry at Tokyo, The Nippon Dental University, 1-9-20 Fujimi, Chiyoda-ku, Tokyo, 102-8159, Japan
| | - Shigehisa Fujii
- Department of Partial and Complete Denture, School of Life Dentistry at Tokyo, The Nippon Dental University, 1-9-20 Fujimi, Chiyoda-ku, Tokyo, 102-8159, Japan
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Alhamoudi FH, Aldosari LIN, Alshadidi AAF, Hassan SAB, Alwadi MAM, Vaddamanu SK, Cicciù M, Minervini G. An Investigation of the Fracture Loads Involved in the Framework of Removable Partial Dentures Using Two Types of All-Ceramic Restorations. Biomimetics (Basel) 2023; 8:biomimetics8010113. [PMID: 36975343 PMCID: PMC10046878 DOI: 10.3390/biomimetics8010113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Revised: 02/21/2023] [Accepted: 03/06/2023] [Indexed: 03/12/2023] Open
Abstract
Retention and support are needed for removable partial denture stability. The stability can be achieved by clasps, occlusal and cingulum rests on healthy abutment teeth. However, implants or crowns can be used to support the removable partial denture instated on unhealthy abutment teeth. This study was conducted to investigate the fracture strength of two types of all-ceramic restorations used as abutments for the removable partial denture framework. The crowns were manufactured with two types of ceramic materials: zirconia and IPS e.max Press ceramics. The metal alloy (cobalt-chrome) was cast to form the removable partial denture framework. A universal testing machine was used to evaluate the fracture strength of both ceramic crown materials. The results presented no fractures in all-ceramic crowns, but deformation of the partial denture frameworks occurred. With the limitation of this study, it can be concluded that zirconia and IPS e.max Press ceramic can be used as abutments to provide adequate support to the removable partial denture.
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Affiliation(s)
- Fahad Hussain Alhamoudi
- Dental Technology Department, College of Applied Medical Science, King Khalid University, Abha 61421, Saudi Arabia
- Correspondence: (F.H.A.); (S.K.V.); (G.M.)
| | - Lujain Ibrahim N. Aldosari
- Department of Prosthetic Dentistry, College of Dentistry, King Khalid University, Abha 61421, Saudi Arabia
| | - Abdulkhaliq Ali F. Alshadidi
- Dental Technology Department, College of Applied Medical Science, King Khalid University, Abha 61421, Saudi Arabia
| | - Saeed Awod Bin Hassan
- Department of Restorative Dental Sciences, College of Dentistry, King Khalid University, Abha 61421, Saudi Arabia
| | - Maram Ali M. Alwadi
- Dental Health Department, College of Applied Medical Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Sunil Kumar Vaddamanu
- Dental Technology Department, College of Applied Medical Science, King Khalid University, Abha 61421, Saudi Arabia
- Correspondence: (F.H.A.); (S.K.V.); (G.M.)
| | - Marco Cicciù
- Department of General Surgery and Medical-Surgical Specialties, School of Dentistry, University of Catania, 95124 Catania, Italy
| | - Giuseppe Minervini
- Multidisciplinary Department of Medical-Surgical and Odontostomatological Specialties, University of Campania “Luigi Vanvitelli”, 80121 Naples, Italy
- Correspondence: (F.H.A.); (S.K.V.); (G.M.)
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da Silva MEB, Dos Santos HS, Ruhland L, Rabelo GD, Badaró MM. Fractal analysis of dental periapical radiographs: A revised image processing method. Oral Surg Oral Med Oral Pathol Oral Radiol 2022; 135:669-677. [PMID: 36609053 DOI: 10.1016/j.oooo.2022.11.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Revised: 10/19/2022] [Accepted: 11/25/2022] [Indexed: 12/05/2022]
Abstract
OBJECTIVE To assess trabecular bone structure as calculated with fractal analysis by 2 binarization processes: White and Rudolph's original method (WR.o) and a revised version (WR.r). Fractal dimension (FD) values calculated with WR.r (FD.r) and a gray-scale-based method (FD.f) were also compared. FD, histogram parameters, and lacunarity were compared by dentate status, jaw location, and sex. STUDY DESIGN Regions of interest from digital periapical radiographs were defined below the teeth roots and in the edentulous sites of 37 patients. Histograms were assessed for pixel values. Binarization was performed with WR.o and then with WR.r, in which the outliers were removed. FD was assessed using WR.r (FD.r) and (FD.f). Histograms were assessed to obtain pixel values. Lacunarity was calculated. RESULTS WR.r revealed fewer trabeculae, branches, and junctions than WR.o (P < .0001). The majority of the mean differences between FD.r and FD.f were within the 95% CI. Dentate areas had greater mean gray levels than partially edentulous areas (P = .0027). FD.f was higher in the mandible (P = .01), but gray-level SD (P < .0001) and lacunarity (P = .02) were greater in the maxilla. FD.f and lacunarity were higher (P = .0005) and lower (P = .0014) in males, respectively. CONCLUSION WR.r was effective in revealing skeletonized bone trabeculae by removing non-trabecular noise. FD.r and FD.f revealed good agreement. FD.f, histogram parameters, and lacunarity differed based on dentate status, jaw location, and sex.
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Affiliation(s)
| | | | - Letícia Ruhland
- Department of Dentistry, Federal University of Santa Catarina, Florianópolis, SC, Brazil
| | - Gustavo Davi Rabelo
- Department of Dentistry, Federal University of Santa Catarina, Florianópolis, SC, Brazil.
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Khubchandani SR, Bhoyar A, Sathe S. Evaluation and Correlation of Bite Force With Electromyography (EMG) Activity Before and After Rehabilitation of the First Molar With an Implant-Supported Prosthesis. Cureus 2022; 14:e31085. [DOI: 10.7759/cureus.31085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Accepted: 11/04/2022] [Indexed: 11/06/2022] Open
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Dayrell AC, Pimenta de Araújo CT, Rocha RL, Isolan CP, Noritomi PY, Mesquita MF. Biomechanics of internal connection in mandibular implant-supported prosthesis under effect of loadings and number of implants: A 3D finite element analysis. Comput Biol Med 2022; 148:105755. [DOI: 10.1016/j.compbiomed.2022.105755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Revised: 06/15/2022] [Accepted: 06/16/2022] [Indexed: 11/16/2022]
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Marcantonio Junior E, Sartori IADM, Vianna CP, Rocha RS, Caldas W, Trojan LC. Influence of risk factors on the long-term survival of oral rehabilitation with extra-narrow implants: a retrospective study. J Appl Oral Sci 2022; 30:e20220089. [PMID: 35920448 PMCID: PMC9365337 DOI: 10.1590/1678-7757-2022-0089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Accepted: 06/22/2022] [Indexed: 11/22/2022] Open
Abstract
Objective This study aimed to retrospectively collect clinical data to evaluate the influence of possible risk factors on the long-term success of implant treatment with extra-narrow (2.9 mm diameter) implants in a daily dental practice setting. Methodology Data were collected from records of patients who received at least one extra-narrow implant from 2012 to 2017, regarding implant survival, prosthesis survival, patient characteristics, and implant characteristics. The association between the dependent variables “implant survival”, “prosthesis survival,” and “adverse events” related to patient and implant characteristics was statistically evaluated by chi-square tests. Moreover, implant and prosthesis survival were analyzed by Kaplan-Meier survival curves. Results The sample was constituted of 58 patients (37 women and 21 men) with a mean age of 54.8 years old (SD: 12.5), followed up for up to eight years. In total, 86 extra-narrow implants were placed within this sample. Four implants were lost, resulting in an implant survival rate of 95.3%. A total of 55 prostheses were inserted and only one (1.8%) was lost, resulting in a prosthesis survival rate of 98.2%. The mean implant and prosthesis survival time was, respectively, 7.1 years and 6.3 years, according to the Kaplan-Meier survival analysis. A correlation was found between smoking and implant loss, which makes implant loss eight times more likely to occur in smokers than non-smokers. A significant association was also found between prosthesis loss and previous need of prosthesis repair. However, it was not considered clinically relevant. No association was found between the occurrence of adverse events and later implant or prosthesis loss. Conclusion High implant and prosthesis survival rates were found in the long term for treatment with extra-narrow implants. Moreover, a significant correlation between smoking and implant loss was observed.
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Kümbüloğlu Ö, Koyuncu B, Yerlioğlu G, Al-Haj Husain N, Özcan M. Stress Distribution on Various Implant-Retained Bar Overdentures. MATERIALS 2022; 15:ma15093248. [PMID: 35591581 PMCID: PMC9101733 DOI: 10.3390/ma15093248] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Revised: 04/24/2022] [Accepted: 04/27/2022] [Indexed: 02/01/2023]
Abstract
The purpose of this study was to evaluate the effects of various fabrication techniques and materials used in implant-supported mandibular overdentures with a Hader bar attachment over added stress distribution. Three-dimensional geometric solid models, consisting of two implants (3.3 mm × 12 mm) placed at the bone level on both mandibular canine regions and a Hader bar structure, were prepared. Model 1 simulated a bar retentive system made from Titanium Grade 5 material by Computer Numerical Control (CNC) milling technique without using any converting adapter/multi-unit element on the implants, while Model 2 simulated the same configuration, but with converting adapters on the implants. Model 3 simulated a bar retentive system made from Cobalt-Chromium material, made by using conventional casting technique with converting adapters on the implants. Static loads of 100 Newton were applied on test models from horizontal, vertical and oblique directions. ANSYS R15.0 Workbench Software was used to compare Von Mises stress distribution and minimum/maximum principal stress values, and the results were evaluated by using Finite Element Analysis method. As a result, the highest stress distribution values under static loading in three different directions were obtained in Model 1. Stress was observed intensely around the necks of the implants and the surrounding cortical bone areas in all models. In scope of the results obtained, using converting adapters on implants has been considered to decrease transmission of forces onto implants and surrounding bone structures, thus providing a better stress distribution. It has also been observed that the type of material used for bar fabrication has no significant influence on stress values in those models where converting adapters were used.
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Affiliation(s)
- Övül Kümbüloğlu
- Department of Prosthodontics, Ege University Faculty of Dentistry, Izmir 35040, Turkey; (Ö.K.); (G.Y.)
| | - Beril Koyuncu
- Department of Prosthodontics, Ege University Faculty of Dentistry, Izmir 35040, Turkey; (Ö.K.); (G.Y.)
- Correspondence: ; Tel.: +90-232-311-2877
| | - Gözde Yerlioğlu
- Department of Prosthodontics, Ege University Faculty of Dentistry, Izmir 35040, Turkey; (Ö.K.); (G.Y.)
- Private Practice at RadixDent, Hurriyet Road, Kordonboyu, No:60, Kartal 34860, Turkey
| | - Nadin Al-Haj Husain
- Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, 3010 Bern, Switzerland;
- Division of Dental Biomaterials, Center of Dental Medicine, Clinic for Reconstructive Dentistry, University of Zurich, 8032 Zurich, Switzerland;
| | - Mutlu Özcan
- Division of Dental Biomaterials, Center of Dental Medicine, Clinic for Reconstructive Dentistry, University of Zurich, 8032 Zurich, Switzerland;
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Retrospective Study Comparing Clinical Outcomes of Fixed Dental Prostheses in Matched Groups of Bruxer and Nonbruxer Patients. Int J Dent 2022; 2022:6818170. [PMID: 35386548 PMCID: PMC8977310 DOI: 10.1155/2022/6818170] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Accepted: 03/12/2022] [Indexed: 02/03/2023] Open
Abstract
Background Tooth-supported fixed dental prosthesis (FDP) is one of the most reliable treatment options to replace missing teeth. The longevity of the treatment could, however, be affected by several general and local factors, especially bruxism. Objective To investigate the influence of bruxism on the long-term survival of tooth-supported FDPs in bruxers compared to a matched group of nonbruxers, taking several clinical variables into account. Materials and Methods The present retrospective cohort study was based on records of patients treated with 3–7-unit tooth-supported FDPs with a minimum follow-up time of 6 months after prosthesis delivery. The criteria for the diagnosis of “possible” and “probable” sleep or awake bruxism were used. A matched group of nonbruxers was selected on the basis of similarities in four factors, patients' gender and age, number of prosthetic units of the FDPs, and follow-up time. The paired-samples t-test or Wilcoxon signed rank test were used to compared mean values between the two groups. Contingency tables of categorical data were analyzed by McNemar's test. Results The cohort group consisted of 62 noncantilevered FDPs in each group, followed up for a mean of 110.1 and 106.5 months (bruxers and nonbruxers, respectively). Tooth-supported FDPs in bruxers presented significantly higher failure rate than in nonbruxers (32.3% vs. 25.8%, respectively; p = 0.001). Loss of retention and tooth loss were the main reasons for failures in both groups. For nonsmokers, the FDP failure rate was higher in nonbruxers. Technical and biological complications were significantly more prevalent in bruxers compared to nonbruxers. Conclusions Bruxism is suggested to increase technical and biological complications and FDP failure.
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12
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Tun Naing S, Kanazawa M, Hada T, Iwaki M, Komagamine Y, Miyayasu A, Uehara Y, Minakuchi S. In vitro study of the effect of implant position and attachment type on stress distribution of implant-assisted removable partial dentures. J Dent Sci 2022; 17:1697-1703. [PMID: 36299337 PMCID: PMC9588788 DOI: 10.1016/j.jds.2021.11.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 11/26/2021] [Indexed: 11/30/2022] Open
Abstract
Background/purpose Implant assisted removable partial dentures (IARPDs) improved biomechanical behavior of removable partial dentures (RPDs), but information of the effect of attachment type and implant position is limited. This study aimed to investigate the effect of implant position and attachment type on the stress distribution of IARPDs. Material and methods Four implants, 10 mm in length and 4.1 mm in diameter, were bilaterally placed close to first premolar and second molar regions of a mandibular Kennedy class I model having artificial dentition from canine to canine, vertical to the occlusal plane. Five IARPDs were fabricated to accommodate locator and magnetic attachments. Strain gauges were placed on the model surface to measure the strain around implants during loading. Unilateral vertical loading was applied to the right first molar area with magnitude of 120 N and crosshead speed of 10 mm/min. Measurements were recorded under following conditions: premolar IARPDs with locator or magnetic attachments, molar IARPDs with locator or magnetic attachments. Two-way multiple analysis of variance was performed to compare the maximum principal strain (MPS) around the implants with a significance level of 0.05. Results Implant position had significant effect on the MPS of IARPD on loading and nonloading sides while attachment type only significant on nonloading side. Molar implants showed larger MPS than premolar implants with both locator and magnetic attachments during unilateral loading. Conclusion The stress distribution of the IARPD is significantly affected by implant position wherein anteriorly placed implants exhibit lower MPS than relatively posteriorly placed implants.
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Affiliation(s)
- Sai Tun Naing
- Department of Gerodontology and Oral Rehabilitation, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Manabu Kanazawa
- Department of Digital Dentistry, Tokyo Medical and Dental University, Tokyo, Japan
- Corresponding author. Department of Digital Dentistry, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan. Fax: +81 3 5803 4645.
| | - Tamaki Hada
- Department of Gerodontology and Oral Rehabilitation, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Maiko Iwaki
- Department of Oral Prosthetic Engineering, Tokyo Medical and Dental University, Tokyo, Japan
| | - Yuriko Komagamine
- Department of Gerodontology and Oral Rehabilitation, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Anna Miyayasu
- Department of Gerodontology and Oral Rehabilitation, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Yoko Uehara
- Department of Gerodontology and Oral Rehabilitation, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Shunsuke Minakuchi
- Department of Gerodontology and Oral Rehabilitation, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
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Maximal Bite Force Measured via Digital Bite Force Transducer in Subjects with or without Dental Implants—A Pilot Study. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12031544] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
The aims of the current study were as following: (1) to evaluate the maximal bite forces in patients with dental implants versus patients without dental implants, as measured by a digital bite force transducer (GM10); (2) to evaluate the influences of sex, age, and sleep/awake bruxism on the maximal bite forces of the two groups. Forty patients recruited to the study were divided into two groups: test group (“implant”) if they had one or more posterior restored implants and control group (“no-implant”) without the presence of posterior dental implants. A digital bite fork (GM10) was used to measure the bite forces from three posterior occluding pairs in all participants. Differences in the mean values between the test and control groups and between different sexes were evaluated using one-way and two-way ANOVA tests. A cross-tabulation analysis was conducted to identify a trend line between the groups. There was no significant difference in the maximal bite force between the test and control groups (p = 0.422), but the cross-tabulation analysis revealed a clear trend of a stronger representation of the “no-implant” group at higher occlusal forces. A significant difference was detected between the maximal biting forces of male and female subjects (p = 0.030 in the implant group, p = 0.010 in the no-implant group), regardless of the experimental group. The presence of bruxism and clenching did not influence the bite force values (p = 0.953), and a significant difference was not found between the age groups (p = 0.393). Within the limitations of this study, it may be assumed that there was no significant difference between the maximal bite forces between patients with and without dental implants but that there was a trend line implicating a stronger representation of the “no-implant” group at higher forces. In addition, the results revealed a significant sex-related difference in the maximal occlusal force. Further studies with larger sample sizes are warranted.
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UCHIKURA K, MURAKAMI N, YAMAZAKI T, LYU H, NAGATA K, ONA M, IWASAKI N, TAKAHASHI H, WAKABAYASHI N. Fracture resistance of CAD/CAM restorative materials in mismatched removable partial denture rests: An <i>in vitro</i> experimental and finite element analysis. Dent Mater J 2022; 41:466-472. [DOI: 10.4012/dmj.2021-224] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Keiichiro UCHIKURA
- Advanced Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Natsuko MURAKAMI
- Advanced Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Toshiki YAMAZAKI
- Advanced Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Huaxin LYU
- Advanced Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Kohji NAGATA
- Advanced Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Masahiro ONA
- Advanced Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Naohiko IWASAKI
- Oral Health Engineering, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Hidekazu TAKAHASHI
- Oral Health Engineering, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
| | - Noriyuki WAKABAYASHI
- Advanced Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University
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15
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Lyu H, Murakami N, Yamazaki T, Wada J, Utsumi M, Wakabayashi N. Evaluation of PEEK and zirconia occlusal rest designs for removable partial dentures based on finite element analysis. J Prosthodont Res 2022; 67:196-205. [PMID: 35644568 DOI: 10.2186/jpr.jpr_d_22_00011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Purpose We aimed to assess removable partial denture occlusal rests composed of polyether-ether-ketone (PEEK) and zirconia, using finite element analysis.Methods Three-dimensional PEEK and zirconia rest models, including the occlusal rest (1.5 mm thickness at the basal portion, 3.0 mm width) and minor connector (1.5 mm thickness, 6.0 mm height), and rest seat models with mechanical properties of enamel were constructed. The radius of transitional curvature between the rest and minor connector was 0.1-0.5 mm. The rest and rest seat model interfaces were set as frictional contacts (μ = 0.1), and the base of the rest seat model was restrained in all the directions. A 100 N downward load was applied perpendicular to the bottom surface of the minor connector. The maximum value of the first principal stress (Max-S1) was compared to the flexural and fatigue strengths of each material. Occlusal rests with 1.0-2.0 mm thickness, 2.0-3.5 mm width, and 0.5 mm radius of transitional curvature were analyzed.Results Max-S1 was observed at the transitional part and decreased with increasing radius of the transitional curvature, rest width, and thickness. PEEK rests with at least 1.5 mm thicknesses and 3.0 mm widths showed lower Max-S1 than the flexural strength. Max-S1 of all PEEK rests exceeded the PEEK fatigue strength, whereas Max-S1 of the zirconia rests was lower than the zirconia fatigue strength.Conclusions Zirconia occlusal rests with conventional metal rest designs have sufficient fatigue strength. PEEK occlusal rests have insufficient fatigue strength and may not withstand repeated mastication.
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Affiliation(s)
- Huaxin Lyu
- Advanced Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Natsuko Murakami
- Advanced Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Toshiki Yamazaki
- Advanced Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Junichiro Wada
- Advanced Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Miona Utsumi
- Advanced Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Noriyuki Wakabayashi
- Advanced Prosthodontics, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
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Lee CHJ, Vu H, Kim HD. Gender and age group modified association of dental health indicators with total occlusal force among Korean elders. BMC Oral Health 2021; 21:571. [PMID: 34749709 PMCID: PMC8574018 DOI: 10.1186/s12903-021-01928-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Accepted: 10/21/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND This study aimed to investigate the distribution of objective total occlusal force (TOF) and its association with dental health indicators: dental status, number of natural teeth (NT), natural and rehabilitated teeth, natural posterior teeth (NT-Post), and natural and rehabilitated posterior teeth among Korean elders after controlling for various confounders encompassing socio-demographic factors, behavioral factors and health/oral health factors. METHODS This cross-sectional study recruited 551 elders from the Sungbook-Gu health education cohort. TOF was measured using Prescale II as an outcome variable. Dental health indicators assessed by dentists were the main explanatory variables. Analysis of covariance and multivariable linear regression models were applied to evaluate the adjusted association of dental health indicators with TOF. Gender and age group stratified analyses were also applied. RESULT TOF was higher in dentate elders than denture wearers in males and younger elders. The adjusted mean of TOF and standard error was 464.24 ± 17.15 N for dentate elders, 297.15 ± 28.85 N for partial denture wearers, 280.42 ± 47.71 N for complete denture wearers. Among all dental health indicators, NT-Post showed the highest association with TOF (partial r = 0.330, p < 0.001, R2 = 0.15), followed by NT (partial r = 0.329, p < 0.001, R2 = 0.16). Older elders highlighted the association of NT (partial r = 0.37, p < 0.001, R2 = 0.18). Males decreased the association of NT (partial r = 0.30, p < 0.001, R2 = 0.20) and NT-Post (partial r = 0.29, p < 0.001, R2 = 0.20). CONCLUSION TOF was significantly associated with dental health indicators, and its association was modified by sex and age group.
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Affiliation(s)
- Christine Hyun Jin Lee
- Department of Preventive and Social Dentistry, College of Dentistry, Seoul National University, 28 Younkeon-Dong, Chongro-Ku, Seoul, 03080, Korea
| | - Huong Vu
- Department of Preventive and Social Dentistry, College of Dentistry, Seoul National University, 28 Younkeon-Dong, Chongro-Ku, Seoul, 03080, Korea
| | - Hyun-Duck Kim
- Department of Preventive and Social Dentistry, College of Dentistry, Seoul National University, 28 Younkeon-Dong, Chongro-Ku, Seoul, 03080, Korea. .,Dental Research Institute, College of Dentistry, Seoul National University, Seoul, Korea.
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17
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Sano M, Shiga H. Gender differences in masticatory function in elderly adults with natural dentition. Odontology 2021; 109:973-978. [PMID: 34228214 DOI: 10.1007/s10266-021-00622-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Accepted: 06/02/2021] [Indexed: 10/20/2022]
Abstract
The purpose of this study was to clarify the presence or absence of gender differences in masticatory function in elderly adults with completely natural dentition. Fifty-six elderly adults aged 65 years and older (elderly group) and 60 young adults in their 20-40 s (young group) with natural dentition participated in this study. The maximum occlusal force on the habitual chewing side was measured using dental prescale. Next, the amount of glucose extraction when subjects chewed a gummy jelly on their habitual chewing side for 20 s was measured. The maximum occlusal force and masticatory performance in the elderly and young groups were compared between males and females. The relationship between the maximum occlusal force and masticatory performance was also investigated. The maximum occlusal force in the elderly and young groups was larger in males than in females, and the difference was significant. The amount of glucose extraction in the elderly and young groups was higher in males than in females, and the difference was significant. Regarding the relationship between the maximum occlusal force and the amount of glucose extraction, there was a significant positive correlation. These results suggest that there are gender differences in the masticatory function of the elderly adults with completely natural dentition, and these differences need to be noted in the evaluation of masticatory function.
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Affiliation(s)
- Mako Sano
- Department of Partial and Complete Denture, School of Life Dentistry At Tokyo, The Nippon Dental University, 1-9-20 Fujimi, Chiyoda-ku, Tokyo, 102-8159, Japan
| | - Hiroshi Shiga
- Department of Partial and Complete Denture, School of Life Dentistry At Tokyo, The Nippon Dental University, 1-9-20 Fujimi, Chiyoda-ku, Tokyo, 102-8159, Japan.
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Linsen SS, Schön A, Teschke M, Mercuri LG. Does Maximum Voluntary Clenching Force Pose a Risk to Overloading Alloplastic Temporomandibular Joint Replacement?-A Prospective Cohort Study. J Oral Maxillofac Surg 2021; 79:2433-2443. [PMID: 34280358 DOI: 10.1016/j.joms.2021.06.018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Revised: 06/04/2021] [Accepted: 06/13/2021] [Indexed: 12/28/2022]
Abstract
PURPOSE The amount of maximum voluntary clenching (MVC) force may influence functional loading at the polyethylene/metal bearing surfaces in alloplastic total temporomandibular joint replacement (TMJR). The aim of this study was to measure ipsilateral MVC and estimate the risk for revision due to overloading of the TMJR. METHODS A prospective cohort study design was used to study patients who underwent alloplastic TMJR. The primary predictor was time after TMJR, the secondary predictors were age at TMJR placement, coronoidectomy, prior ipsilateral TMJ surgeries, TMJR design (custom, stock), and bite location. The primary outcome variable was MVC, the secondary outcome was need for TMJR revision. Data were collected preoperatively (T0), and 1 year (T1), 2 to 3 years (T2) and ≥4 years postoperatively (T3). Analysis of variance (ANOVA) with post hoc Tukey-HSD and regression analysis was used for statistical analysis. P < .05 was considered significant. RESULTS Thirty-seven patients (58 TMJR) with unilateral (n = 16) and bilateral (n = 21) TMJR were enrolled; 8 males (12 TMJR) and 29 females (46 TMJR). Average age was 46.4 ± 14.9 years. MVC increased significantly over the observation period (P = .000). At all observation time points, age at TMJR placement and bite location significantly influenced MVC (P = .000). Coronoidectomy and prior ipsilateral TMJ surgeries did not demonstrate a significant influence on MVC. TMJR design influenced MVC significantly at T3 (P = .006). Regression analysis identified age as a significant factor for higher MVC. No TMJR required revision or replacement. CONCLUSIONS Based on this study, ipsilateral MVC increases significantly after TMJR. However, since MVC is significantly lower than in healthy test-patients, a considerably lower functional loading at the polyethylene/metal bearing surfaces can be assumed. Lower loading at the TMJR bearing surfaces and at the cortical screw fixation sites suggest a potential longer lifespan compared to other artificial joints like hip and knee prostheses.
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Affiliation(s)
- Sabine S Linsen
- Priv.-Doz., Dr. med. dent., MSc, Assistant Professor, Department of Prosthodontics, Preclinical Education and Dental Material Science, University Hospital Bonn, Bonn, Germany.
| | - Andreas Schön
- Dr. med., Dr. med. dent., Assistant Professor, Department of Oral- and Maxillofacial Plastic Surgery, University Hospital Bonn, Bonn, Germany
| | - Marcus Teschke
- Dr. med., Dr. med. dent., Private Practice, Praxis fuer Gesichtschirurgie und Kiefergelenkschirurgie, Hamburg, Germany
| | - Louis G Mercuri
- Visiting Professor, Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, IL; Adjunct Professor, Department of Bioengineering, University of Illinois Chicago, Chicago, IL; Clinical Consultant, TMJ Concepts, Ventura, CA
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Effect of the Location of Dental Mini-Implants on Strain Distribution under Mandibular Kennedy Class I Implant-Retained Removable Partial Dentures. Int J Dent 2021; 2021:6688521. [PMID: 34054963 PMCID: PMC8112937 DOI: 10.1155/2021/6688521] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2020] [Revised: 03/05/2021] [Accepted: 03/15/2021] [Indexed: 11/17/2022] Open
Abstract
Purpose To investigate the effect of minidental implant location on strain distributions transmitted to tooth abutments and dental minidental implants under mandibular distal extension removable partial denture. Materials and Methods A mandibular Kennedy Class I distal extension model missing teeth 35–37 and 45–47 was constructed. Six dental mini-implants were placed at positions A, B, and C, where position A was 6.5 mm distal to the abutment teeth with 5 mm between each position. Fourteen uniaxial strain gauges were bonded on the model at the region of dental mini-implant and abutment (first premolar). Four groups were designated according to the location of the mini-implants. A load of 150 N and 200 N was applied using an Instron testing machine. Loadings consisted of bilateral and unilateral loading. Comparisons of the mean microstrains among all strain gauges in all situations were analyzed. Results Variation in mini-implant locations induced local strains in different areas. Strains at the tooth abutment were significantly decreased in the group in which implants were placed mesially. Strains around the mini-implants showed different patterns when loaded with different loading conditions. The group in which implants were placed distally showed the lowest strains compared to other groups. Conclusion Mesially placed mini-implants showed the lowest strain around abutment teeth, while a distally-placed mini-implants presented the lowest strain around mini-implants themselves. Under favorable biting force, mini-implant is an option to assist mandibular distal extension removable partial denture. Mesially placed mini-implants are recommended when the abutment has periodontally compromised conditions and a distally placed mini-implant when periodontal conditions are stable.
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Milić Lemić A, Rajković K, Radović K, Živković R, Miličić B, Perić M. The use of digital texture image analysis in determining the masticatory efficiency outcome. PLoS One 2021; 16:e0250936. [PMID: 33956854 PMCID: PMC8101913 DOI: 10.1371/journal.pone.0250936] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2020] [Accepted: 04/17/2021] [Indexed: 01/17/2023] Open
Abstract
The mixture level of gum samples consisting of two colours can be assessed visually, using the electronic colorimetric method, employing digital image processing techniques and specially designed software. The study investigates the possibility of an alternative method called "digital texture image analysis" (DTIA) to assess improvement of masticatory efficiency in denture wearers. The objectives were i) to evaluate whether DTIA discriminates changes in the colour mixing ability within a group over time; ii) to determine whether DTIA can be used to detect improvement in chewing ability; iii) to select the most appropriate DTIA feature that sufficiently describes masticatory efficiency in CDs wearers. The study was designed as an intra-individual evaluation of masticatory efficiency, which was assessed in participants with new dentures in three follow-up times. A set of four texture features was used in the current study. Uniformity, Contrast, Homogeneity and Entropy of the obtained chewing-gum samples were correlated to the degree of gum comminution. A statistically significant difference in masticatory efficiency was observed based on the values of the analysed DTIA variables of gum samples-Uniformity, Contrast, Homogeneity, and Entropy-have changed in the participants during the observation period. The improvement of the masticatory function in relation to the mixing ability of two-coloured chewing gum could be traced by monitoring changes in the values of DTIA variables. The most increasement of masticatory efficiency was observed by monitoring DTIA parameters such as contrast, and homogeneity.
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Affiliation(s)
- Aleksandra Milić Lemić
- Clinic for Prosthetic Dentistry, Faculty of Dental Medicine, University of Belgrade, Belgrade, Serbia
| | - Katarina Rajković
- College of Applied Studies of Technics and Technology, Kruševac, Serbia
| | - Katarina Radović
- Clinic for Prosthetic Dentistry, Faculty of Dental Medicine, University of Belgrade, Belgrade, Serbia
| | - Rade Živković
- Clinic for Prosthetic Dentistry, Faculty of Dental Medicine, University of Belgrade, Belgrade, Serbia
| | - Biljana Miličić
- Department for Informatics and Biostatistics, Faculty of Dental Medicine, University of Belgrade, Belgrade, Serbia
| | - Mirjana Perić
- Clinic for Prosthetic Dentistry, Faculty of Dental Medicine, University of Belgrade, Belgrade, Serbia
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Arita S, Gonda T, Togawa H, Maeda Y, Ikebe K. Influence of mandibular distal extension implant-supported removable partial dentures on the force exerted on maxillary anterior teeth. J Prosthodont Res 2021; 65:541-545. [PMID: 33896889 DOI: 10.2186/jpr.jpr_d_20_00077] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
PURPOSE This study aimed to determine the influence of mandibular free-end partial edentulism and use of conventional or implant-supported removable dental prostheses in the partially edentulous area on the load exerted on the maxillary anterior teeth. METHODS A jaw model with mandibular free-end missing teeth was used, and a distal extension, removable partial dental prosthesis was fabricated to replace the missing posterior teeth. Four experimental conditions were set up: 1) without prosthesis, 2) with a conventional removable partial dental prosthesis, 3) with an implant-supported removable partial dental prosthesis, and 4) with a complete dental arch. Strain gauges were attached to the root surface of the maxillary left central incisor, canine, first premolar, and first molar. The load exerted on them was calculated based on the calibration coefficient. An occlusal load of 49 N was applied, and the forces were compared using a Kruskal-Wallis test (P < 0.05). RESULTS The load exerted on the maxillary anterior teeth increased significantly with no prosthesis, decreased significantly with a conventional removable partial dental prosthesis, and decreased even more significantly with an implant-supported removable partial dental prosthesis. CONCLUSIONS The burden on the maxillary anterior teeth decreased with the use of a removable partial dental prosthesis and decreased even further with the use of an implant-supported dental prosthesis. The use of an implant to support a distal extension removable partial dental prosthesis is potentially effective in preserving the remaining teeth and tissues by reducing excessive stress in patients with mandibular free-end partial edentulism.
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Affiliation(s)
| | - Tomoya Gonda
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka
| | - Hitomi Togawa
- Division of Comprehensive Prosthodontics, Niigata University Graduate School of Medical and Dental Sciences, Niigata
| | - Yoshinobu Maeda
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka
| | - Kazunori Ikebe
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Osaka
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22
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Da Silva JD, Ni SC, Lee C, Elani H, Ho K, Thomas C, Kuwajima Y, Ishida Y, Kobayashi T, Ishikawa-Nagai S. Association between cognitive health and masticatory conditions: a descriptive study of the national database of the universal healthcare system in Japan. Aging (Albany NY) 2021; 13:7943-7952. [PMID: 33739304 PMCID: PMC8034966 DOI: 10.18632/aging.202843] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2021] [Accepted: 03/05/2021] [Indexed: 12/02/2022]
Abstract
Cognitive health is subject to decline with increasing numbers of lost teeth which impacts mastication. This study is a descriptive data analysis of the association between masticatory and cognitive conditions using a large database. We obtained the dental and medical records from Japan's universal healthcare system (UHCS) from the national database in 2017. The data from 94% of the Japanese population aged 65 and over is included. It is inclusive of diagnostic codes for various types of cognitive impairment, as well as dental treatment records from 2012 to 2017. The cognitive impairment group was compared to those without a diagnosis of cognitive impairment. Crude odds ratio between loss of mastication with natural teeth (exposure) and cognitive impairments (outcome) were compared. Patients who have lost masticatory function are likely to have cognitive impairment with an odds ratio of 1.89 (p<0.0001) for early elderly (aged 65-75) and 1.33 (p<0.0001) for advanced elderly (over 75). Patients who are edentulous and function with complete dentures are likely to have cognitive impairment with an odds ratio of 2.38 (p<0.0001) and 1.38 (p<0.0001), respectively. The data shows a convincing and significant result of an association between cognitive health and oral health, related to masticatory conditions.
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Affiliation(s)
- John D Da Silva
- Restorative Dentistry and Biomaterial Sciences, Harvard School of Dental Medicine, Boston, MA 02115, USA
| | - Shy Chwen Ni
- Oral Medicine, Infection and Immunity, Harvard School of Dental Medicine, Boston, MA 02115, USA
| | - Cliff Lee
- Oral Medicine, Infection and Immunity, Harvard School of Dental Medicine, Boston, MA 02115, USA
| | - Hawazin Elani
- Oral Health Policy and Epidemiology, Harvard School of Dental Medicine, Boston, MA 02115, USA
| | - Kailing Ho
- DMD Candidate, Harvard School of Dental Medicine, Boston, MA 02115, USA
| | - Carlos Thomas
- DMD Candidate, Harvard School of Dental Medicine, Boston, MA 02115, USA
| | - Yukinori Kuwajima
- Oral Medicine, Infection and Immunity, Harvard School of Dental Medicine, Boston, MA 02115, USA
| | - Yoshiki Ishida
- Oral Medicine, Infection and Immunity, Harvard School of Dental Medicine, Boston, MA 02115, USA
| | | | - Shigemi Ishikawa-Nagai
- Oral Medicine, Infection and Immunity, Harvard School of Dental Medicine, Boston, MA 02115, USA.,Iwate Medical University, School of Dental Medicine, Japan
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Razdan S, Bhat V, Reddy H, Shetty S. Evaluation of bite force in patients with cleft lip and palate and its comparison with normal patients. ARCHIVES OF MEDICINE AND HEALTH SCIENCES 2021. [DOI: 10.4103/amhs.amhs_235_20] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Kang SH, Kim SK, Heo SJ, Koak JY. Survival rate and clinical evaluation of the implants in implant assisted removable partial dentures: surveyed crown and overdenture. J Adv Prosthodont 2020; 12:239-249. [PMID: 32879715 PMCID: PMC7449826 DOI: 10.4047/jap.2020.12.4.239] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Revised: 05/25/2020] [Accepted: 06/01/2020] [Indexed: 12/17/2022] Open
Abstract
PURPOSE The purpose of this study was to investigate survival rates of the implants used in implant assisted removable partial dentures (IARPDs). MATERIALS AND METHODS The study was conducted on 21 patients who were treated with IARPDs. The mean follow-up period for IARPD patients ranged from 12 to 185 months (mean 47.9 months). A total of 58 implants were used for IARPDs in two different modalities: 41 for surveyed crowns and 17 for overdentures. The survival of implants was determined by clinical and radiographic evaluations considering relevant factors: location, RPD classification, opposing dentition, splinting, and implant diameter. RESULTS The survival rate of total 58 implants was 93.1%: 95.1% for implants supporting surveyed crowns and 88.2% for implants used in overdentures. Considering only the implants supporting surveyed crown, regular diameter implants showed a higher survival rate than narrow or wide diameter implants. CONCLUSION The survival rate of the implants used in IARPDs was 93.1% (surveyed crown: 95.1%, overdenture: 88.2%).
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Affiliation(s)
- Soo-Hyun Kang
- Department of Prosthodontics & Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Republic of Korea
| | - Seong-Kyun Kim
- Department of Prosthodontics & Dental Research Institute, Seoul National University Dental Hospital, School of Dentistry, Seoul National University, Seoul, Republic of Korea
| | - Seong-Joo Heo
- Department of Prosthodontics & Dental Research Institute, Seoul National University Dental Hospital, School of Dentistry, Seoul National University, Seoul, Republic of Korea
| | - Jai-Young Koak
- Department of Prosthodontics & Dental Research Institute, Seoul National University Dental Hospital, School of Dentistry, Seoul National University, Seoul, Republic of Korea
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Soni R, Yadav H, Pathak A, Bhatnagar A, Kumar V. Comparative evaluation of biting force and chewing efficiency of all-on-four treatment concept with other treatment modalities in completely edentulous individuals. J Indian Prosthodont Soc 2020; 20:312-320. [PMID: 33223702 PMCID: PMC7654204 DOI: 10.4103/jips.jips_464_19] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2019] [Revised: 05/24/2020] [Accepted: 06/22/2020] [Indexed: 11/13/2022] Open
Abstract
Aim: To compare and evaluate biting force and chewing efficiency of all-on-four treatment concept, implant-supported overdenture, and conventional complete denture. Settings and Design: Invivo – comparative study. Materials and Methods: A total of 12 edentulous patients were included in the study and conventional complete dentures were fabricated. Patients were divided into two groups. In Group 1, complete dentures were replaced with implant-supported overdenture, and in Group 2, complete dentures were replaced with hybrid denture supported by all-on-four treatment concept. The biting force was assessed using a bite force sensor and electromyographic recordings were made by electromyogram for masticatory muscles when chewing three different consistencies of foods. Statistical Analysis Used: The data was statistically analyzed using software SPSS version 22.0. Paired t-test was used for intra-group comparison and unpaired t-test was used for intergroup comparison. Results: The difference in biting force and chewing efficiency for all-on-four treatment concept was statistically significant for overdenture and complete denture. The highest biting force and chewing efficiency were observed for all-on-four treatment concept, followed by implant-supported overdenture and complete denture. Conclusion: The study concluded that the completely edentulous individuals with atrophic posterior alveolar ridges can be rehabilitated successfully with improved biting force and chewing efficiency by All-on-four treatment concept.
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Affiliation(s)
- Romesh Soni
- Department of Prosthodontics, Faculty of Dental Sciences, IMS, BHU, Varanasi, Uttar Pradesh, India
| | - Himanshi Yadav
- Department of Prosthodontics, Faculty of Dental Sciences, IMS, BHU, Varanasi, Uttar Pradesh, India
| | - Abhishek Pathak
- Department of Neurology, IMS, BHU, Varanasi, Uttar Pradesh, India
| | - Atul Bhatnagar
- Department of Prosthodontics, Faculty of Dental Sciences, IMS, BHU, Varanasi, Uttar Pradesh, India
| | - Vikram Kumar
- Department of Prosthodontics, Faculty of Dental Sciences, IMS, BHU, Varanasi, Uttar Pradesh, India
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Comparison of two dental prescale systems used for the measurement of occlusal force. Odontology 2020; 108:676-680. [DOI: 10.1007/s10266-020-00509-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Accepted: 03/13/2020] [Indexed: 01/23/2023]
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Limpuangthip N, Somkotra T, Arksornnukit M. Subjective and objective measures for evaluating masticatory ability and associating factors of complete denture wearers: A clinical study. J Prosthet Dent 2020; 125:287-293. [PMID: 32115222 DOI: 10.1016/j.prosdent.2020.01.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Revised: 01/01/2020] [Accepted: 01/02/2020] [Indexed: 11/26/2022]
Abstract
STATEMENT OF PROBLEM The masticatory ability of complete denture (CD) wearers can be evaluated subjectively and objectively. Although an objective measure reflects a person's ability to masticate food, it is rarely used in clinical practice. Moreover, the factors associated with subjective and objective masticatory ability of CD wearers remain unclear. PURPOSE The purpose of this clinical study was to identify subjective and objective measures that better reflect the masticatory ability of CD wearers and to investigate their associating factors. MATERIAL AND METHODS Masticatory ability was evaluated in 130 CD wearers by using subjective and objective measures. The subjective indicators were oral impact on eating and denture satisfaction based on eating or mastication ability. Masticatory performance was objectively measured by using a median peanut particle size. The maximum occlusal force, number, and area of occlusal contacts were determined from a pressure-sensitive sheet. CD retention and stability were classified into acceptable and unacceptable denture quality following the CU-modified Kapur criteria. The occlusal pattern and oral conditions were examined and recorded. Intraexaminer reliability in determining CD quality and oral condition was shown by a Kappa score of 0.90 to 0.95. Multivariable linear and logistic regressions were performed to analyze the associations between CD quality, maximum occlusal force, and masticatory ability. The Spearman correlation was used to determine the association between subjective and objective measures. Sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) between subjective and objective measures were calculated. RESULTS Unacceptable CD quality was significantly associated with oral impact on eating, eating dissatisfaction, and larger peanut particle size (P<.001). Peanut particle size increased with lower maximum occlusal force, which was related to fewer occlusal contacts and the female sex. The highest to lowest adjusted R2 values were related to masticatory performance, oral impact on eating, and eating satisfaction models. Among participants with unacceptable CD quality, 16% had higher masticatory performance, 25%, had no oral impact on eating, and 33% reported eating satisfaction. The sensitivity and specificity values of subjective measures in predicting lower masticatory performance were approximately recorded at 74% and 90%, respectively, whereas PPV and NPV were at 90% and 77%, respectively. CONCLUSIONS CD retention and stability impact objective and subjective masticatory ability. Objective masticatory performance is the best measure for evaluating the masticatory ability of CD wearers, followed by oral impact on eating and eating satisfaction. A 3.6-mm peanut particle size is suggested as a cutoff value for identifying CD wearers with impaired masticatory ability.
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Affiliation(s)
- Nareudee Limpuangthip
- Lecturer, Department of Prosthodontics, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Tewarit Somkotra
- Assistant Professor, Department of Community Dentistry, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Mansuang Arksornnukit
- Associate Professor, Department of Prosthodontics, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand.
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Arita S, Gonda T, Togawa H, Maeda Y, Ikebe K. Influence of mandibular free-end partial edentulism on the force exerted on maxillary anterior teeth. J Prosthodont Res 2020; 64:454-459. [PMID: 32061570 DOI: 10.1016/j.jpor.2019.12.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2019] [Revised: 11/16/2019] [Accepted: 12/12/2019] [Indexed: 11/17/2022]
Abstract
PURPOSE The purpose of this study was to determine the influence of mandibular free-end partial edentulism and the wearing of removable partial dentures in the partially edentulous area on the force exerted on maxillary anterior teeth. METHODS A commercially available jaw model with exchangeable teeth was used. Seven experimental conditions of mandibular free-end edentulism were set up and a distal extension removable partial denture to replace missing posterior teeth was fabricated. Strain gauges were attached to the root surface of the maxillary left central incisor, canine, first premolar and first molar, and the force exerted on them was calculated based on the calibration coefficient. An occlusal load of 49 N was applied and the forces were compared with the Kruskal-Wallis test (P < 0.05). RESULTS The force exerted on the maxillary anterior teeth increased significantly as the number of remaining teeth decreased. The force exerted on the maxillary anterior teeth decreased significantly with use of a removable partial denture. CONCLUSIONS When the number of remaining teeth decreases in mandibular free-end partial edentulism, the burden on the maxillary anterior teeth increases. Our findings suggest that for patients with mandibular free-end partial edentulism, wearing a removable partial denture is effective in preserving the remaining teeth by reducing excessive stress.
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Affiliation(s)
| | - Tomoya Gonda
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Japan.
| | - Hitomi Togawa
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Japan
| | - Yoshinobu Maeda
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Japan
| | - Kazunori Ikebe
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University Graduate School of Dentistry, Japan
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Stober T, Bermejo JL, Rues S, Rammelsberg P. Wear of resin denture teeth in partial removable dental prostheses. J Prosthodont Res 2020; 64:85-89. [DOI: 10.1016/j.jpor.2019.04.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Revised: 03/12/2019] [Accepted: 04/02/2019] [Indexed: 10/26/2022]
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Ohi T, Komiyama T, Miyoshi Y, Murakami T, Tsuboi A, Tomata Y, Tsuji I, Watanabe M, Hattori Y. The association between bilateral maximum occlusal force and all-cause mortality among community-dwelling older adults: The Tsurugaya project. J Prosthodont Res 2019; 64:289-295. [PMID: 31494054 DOI: 10.1016/j.jpor.2019.08.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Revised: 07/24/2019] [Accepted: 08/23/2019] [Indexed: 11/28/2022]
Abstract
PURPOSE This study aimed to investigate the relationship between the bilateral maximum occlusal force (MOF) of full dental arches and all-cause mortality in a group of community-dwelling older males and females in Japan. METHODS This 13-year prospective cohort study was conducted among 815 older adults (395 male and 420 female) aged 70 years or over (mean age ± standard deviation: 75.1 ± 4.5 years). Bilateral MOF in the intercuspal position was recorded with horseshoe-shaped pressure-sensitive film. Participants were grouped by gender into tertiles according to MOF. Demographic variables, chronicity, comorbidity, physical status, cognitive and psychological status, social functioning, and blood chemistry data were also assessed. Information regarding all-cause mortality and migration was obtained from the Sendai Municipal Authority. Cox proportional hazard modeling was performed to assess all-cause mortality during the follow-up period. RESULTS In total, 159 male and 109 female participants died over a median 12.9-year follow-up period, and the cumulative mortality significantly increased with lower MOF in both males and females. The multivariate Cox proportional hazard model demonstrated a significant increase in the risk of all-cause mortality associated with lower tertiles of MOF, relative to the upper tertile in males (hazard ratio: 1.62; 95% confidence interval: 1.05-2.51) and females (hazard ratio: 1.94; 95% confidence interval: 1.10-3.56). CONCLUSIONS There was a significant and independent association of bilateral MOF with all-cause mortality in community-dwelling elderly males and females in Japan. These findings suggested that maintenance of oral functioning contributes to general health.
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Affiliation(s)
- Takashi Ohi
- Division of Aging and Geriatric Dentistry, Department of Oral Function and Morphology, Tohoku University Graduate School of Dentistry, Sendai, Japan; Japanese Red Cross Ishinomaki Hospital, Ishinomaki, Japan.
| | - Takamasa Komiyama
- Division of Aging and Geriatric Dentistry, Department of Oral Function and Morphology, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - Yoshitada Miyoshi
- Division of Aging and Geriatric Dentistry, Department of Oral Function and Morphology, Tohoku University Graduate School of Dentistry, Sendai, Japan
| | - Takahisa Murakami
- Division of Public Health, Hygiene and Epidemiology, Faculty of Medicine, Tohoku Medical and Pharmaceutical University, Sendai, Japan
| | - Akito Tsuboi
- Department of Community Medical Supports, Tohoku Medical Megabank Organization, Tohoku University, Sendai, Japan
| | - Yasutake Tomata
- Division of Epidemiology, Department of Health Informatics and Public Health, Tohoku University School of Public Health, Graduate School of Medicine, Sendai, Japan
| | - Ichiro Tsuji
- Division of Epidemiology, Department of Health Informatics and Public Health, Tohoku University School of Public Health, Graduate School of Medicine, Sendai, Japan
| | - Makoto Watanabe
- Department of Social Welfare, Faculty of General Welfare, Tohoku Fukushi University, Sendai, Japan
| | - Yoshinori Hattori
- Division of Aging and Geriatric Dentistry, Department of Oral Function and Morphology, Tohoku University Graduate School of Dentistry, Sendai, Japan
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Abdel-Moemin AR, Regenstein JM, Abdel-Rahman MK. New Food Products for Sensory-Compromised Situations. Compr Rev Food Sci Food Saf 2018; 17:1625-1639. [DOI: 10.1111/1541-4337.12399] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Revised: 09/09/2018] [Accepted: 09/10/2018] [Indexed: 01/19/2023]
Affiliation(s)
- Aly R. Abdel-Moemin
- Dept. of Nutrition and Food Science, Faculty of Home Economics; Helwan Univ.; Cairo Egypt
| | | | - Manal K. Abdel-Rahman
- Dept. of Nutrition and Food Science, Faculty of Home Economics; Helwan Univ.; Cairo Egypt
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Teeth and Covariates: Association with Risk of Falls. Int J Dent 2018; 2018:7127209. [PMID: 30034470 PMCID: PMC6035810 DOI: 10.1155/2018/7127209] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Revised: 03/28/2018] [Accepted: 04/23/2018] [Indexed: 11/22/2022] Open
Abstract
Purpose Falls occur commonly in geriatric populations and undesirably influence their life, morbidity, and mortality. The aim of this study was to analyze the association between the number of teeth present among the elderly population and covariates in relation to the risk of falls. Materials and Methods This study was conducted at various old age homes in the Klang Valley region of Malaysia involving the geriatric population aged 60 years and above. A detailed questionnaire consisting of sociodemographic data including sex, age, household income, and dental variables such as the number of teeth and chewing difficulty was obtained. The Tinetti test (TT) was used to evaluate the patients' ability to walk, to maintain postural balance, and to determine their risk of falling. The short version of the Geriatric Depression Scale was used to assess depression among the participants, and the Barthel Scale was used to analyze the subject's ability to perform the activities of daily living (ADL). Results Statistically significant association was observed in relation to the number of teeth present and risk of falls (p < 0.05). Subjects who had 19 teeth or less in total had moderate to highest risk of falls (p=0.001) in comparison with subjects who had 20 teeth or more. Those aged 70 years and above showed the highest risk of falls (p=0.001) in comparison with the subjects aged between 60 and 69 years. Subjects with depression (p=0.03) and presence of illness related to fall showed statistically significant difference (p=0.001) in comparison with those who did not suffer from the same. Compromised ADL (p=0.001) (which included ability to perform several tasks like indoor mobility, climbing stairs, toilet use, and feeding) and low monthly income (p=0.03) was also observed among subjects who had higher risk of falls. Conclusion According to the results achieved, there was a high statistically significant association observed between the number of teeth present, age, depression, ADL, and presence of illness in relation to the risk of falling among the geriatric population. Henceforth, oral rehabilitation of elderly patients with less number of teeth may reduce their risk of falls.
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Pedersen A, Sørensen CE, Proctor GB, Carpenter GH. Salivary functions in mastication, taste and textural perception, swallowing and initial digestion. Oral Dis 2018; 24:1399-1416. [PMID: 29645367 DOI: 10.1111/odi.12867] [Citation(s) in RCA: 119] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2018] [Accepted: 04/03/2018] [Indexed: 12/18/2022]
Abstract
Saliva exerts multiple functions in relation to the initial digestive processes taking place in the upper parts of the gastrointestinal tract. Ingestion of food and beverages, in turn, is a strong stimulus for secretion of saliva with a differential composition depending on the neuronal stimulation pattern. This review paper provides insight into the mechanisms by which saliva acts in relation to taste, mastication, bolus formation, enzymatic digestion and swallowing. Also, the protective functions of saliva including maintenance of dental and mucosal integrity will be discussed as they indirectly influence the digestive process. The final part of this study focuses on the implications of xerostomia and salivary gland dysfunction on gastrointestinal functions.
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Affiliation(s)
- Aml Pedersen
- Section 1, Oral Medicine, Oral Pathology & Clinical Oral Physiology, Department of Odontology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - C E Sørensen
- Section of Oral Biochemistry, Cariology & Endodontics, Department of Odontology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - G B Proctor
- Mucosal & Salivary Biology Division, King's College London Dental Institute, Guy's & St Thomas' Hospitals, London, UK
| | - G H Carpenter
- Mucosal & Salivary Biology Division, King's College London Dental Institute, Guy's & St Thomas' Hospitals, London, UK
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Khoury-Ribas L, Ayuso-Montero R, Rovira-Lastra B, Peraire M, Martinez-Gomis J. Reliability of a new test food to assess masticatory function. Arch Oral Biol 2017; 87:1-6. [PMID: 29241026 DOI: 10.1016/j.archoralbio.2017.12.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Revised: 10/30/2017] [Accepted: 12/06/2017] [Indexed: 10/18/2022]
Abstract
OBJECTIVE This study assessed the reliability and validity of masticatory function assessment using a new test food, Optozeta. DESIGN Thirty-five adults participated in the cross-sectional clinical part of the study; ten of them performed a retest. They performed two free-style masticatory tests consisting of five trials of 20 cycles each chewing three pieces of Optosil or Optozeta placed in a latex bag. Optozeta was created by mixing 50% Optosil with 50% of Zetalabor. Masticatory performance, masticatory laterality and chewing rate were assessed. Reliability and construct validity were assessed using the intraclass correlation coefficient (ICC) and Spearman correlations, respectively. RESULTS Higher ICC values were observed for each aspect of masticatory function as assessed using Optozeta compared with Optosil. All the participants showed a lower median particle size value using Optozeta than Optosil. For each masticatory parameter, a high correlation was observed between using Optosil or Optozeta. CONCLUSIONS Optozeta seems to have good construct validity and appears to be more reliable than Optosil as a test food to assess masticatory function.
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Affiliation(s)
- Laura Khoury-Ribas
- Department of Prosthodontics, School of Dentistry, Faculty of Medicine and Health Sciences, University of Barcelona, Catalonia, Spain; Oral Health and Masticatory System Group (Bellvitge Biomedical Research Institute) IDIBELL, L'Hospitalet de Llobregat, Barcelona, Catalonia, Spain
| | - Raul Ayuso-Montero
- Department of Prosthodontics, School of Dentistry, Faculty of Medicine and Health Sciences, University of Barcelona, Catalonia, Spain; Oral Health and Masticatory System Group (Bellvitge Biomedical Research Institute) IDIBELL, L'Hospitalet de Llobregat, Barcelona, Catalonia, Spain
| | - Bernat Rovira-Lastra
- Department of Prosthodontics, School of Dentistry, Faculty of Medicine and Health Sciences, University of Barcelona, Catalonia, Spain; Oral Health and Masticatory System Group (Bellvitge Biomedical Research Institute) IDIBELL, L'Hospitalet de Llobregat, Barcelona, Catalonia, Spain
| | - Maria Peraire
- Department of Prosthodontics, School of Dentistry, Faculty of Medicine and Health Sciences, University of Barcelona, Catalonia, Spain; Oral Health and Masticatory System Group (Bellvitge Biomedical Research Institute) IDIBELL, L'Hospitalet de Llobregat, Barcelona, Catalonia, Spain
| | - Jordi Martinez-Gomis
- Department of Prosthodontics, School of Dentistry, Faculty of Medicine and Health Sciences, University of Barcelona, Catalonia, Spain; Oral Health and Masticatory System Group (Bellvitge Biomedical Research Institute) IDIBELL, L'Hospitalet de Llobregat, Barcelona, Catalonia, Spain.
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Nasution H, Kamonkhantikul K, Arksornnukit M, Takahashi H. Pressure transmission area and maximum pressure transmission of different thermoplastic resin denture base materials under impact load. J Prosthodont Res 2017; 62:44-49. [PMID: 28606420 DOI: 10.1016/j.jpor.2017.05.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Revised: 05/02/2017] [Accepted: 05/18/2017] [Indexed: 11/18/2022]
Abstract
PURPOSES The purposes of the present study were to examine the pressure transmission area and maximum pressure transmission of thermoplastic resin denture base materials under an impact load, and to evaluate the modulus of elasticity and nanohardness of thermoplastic resin denture base. METHODS Three injection-molded thermoplastic resin denture base materials [polycarbonate (Basis PC), ethylene propylene (Duraflex), and polyamide (Valplast)] and one conventional heat-polymerized acrylic resin (PMMA, SR Triplex Hot) denture base, all with a mandibular first molar acrylic resin denture tooth set in were evaluated (n=6). Pressure transmission area and maximum pressure transmission of the specimens under an impact load were observed by using pressure-sensitive sheets. The modulus of elasticity and nanohardness of each denture base (n=10) were measured on 15×15×15×3mm3 specimen by using an ultramicroindentation system. The pressure transmission area, modulus of elasticity, and nanohardness data were statistically analyzed with 1-way ANOVA, followed by Tamhane or Tukey HSD post hoc test (α=.05). The maximum pressure transmission data were statistically analyzed with Kruskal-Wallis H test, followed by Mann-Whitney U test (α=.05). RESULTS Polymethyl methacrylate showed significantly larger pressure transmission area and higher maximum pressure transmission than the other groups (P<.001). Significant differences were found in modulus of elasticity and nanohardness among the four types of denture bases (P<.001). CONCLUSIONS Pressure transmission area and maximum pressure transmission varied among the thermoplastic resin denture base materials. Differences in the modulus of elasticity and nanohardness of each type of denture base were demonstrated.
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Affiliation(s)
- Hubban Nasution
- Department of Prosthodontics, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Krid Kamonkhantikul
- Department of Prosthodontics, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Mansuang Arksornnukit
- Department of Prosthodontics, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand.
| | - Hidekazu Takahashi
- Oral Biomaterials Engineering, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
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Tanaka M, Bruno C, Jacobs R, Torisu T, Murata H. Short-term follow-up of masticatory adaptation after rehabilitation with an immediately loaded implant-supported prosthesis: a pilot assessment. Int J Implant Dent 2017; 3:8. [PMID: 28271438 PMCID: PMC5340790 DOI: 10.1186/s40729-017-0070-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Accepted: 02/23/2017] [Indexed: 12/14/2022] Open
Abstract
Background When teeth are extracted, sensory function is decreased by a loss of periodontal ligament receptions. When replacing teeth by oral implants, one hopes to restore the sensory feedback pathway as such to allow for physiological implant integration and optimized oral function with implant-supported prostheses. What remains to be investigated is how to adapt to different oral rehabilitations. The purpose of this pilot study was to assess four aspects of masticatory adaptation after rehabilitation with an immediately loaded implant-supported prosthesis and to observe how each aspect will recover respectively. Methods Eight participants with complete dentures were enrolled. They received an implant-supported acrylic resin provisional bridge, 1 day after implant surgery. Masticatory adaptation was examined by assessing occlusal contact, approximate maximum bite force, masticatory efficiency of gum-like specimens, and food hardness perception. Results Occlusal contact and approximate maximum bite force were significantly increased 3 months after implant rehabilitation, with the bite force gradually building up to a 72% increase compared to baseline. Masticatory efficiency increased by 46% immediately after surgery, stabilizing at around 40% 3 months after implant rehabilitation. Hardness perception also improved, with a reduction of the error rate by 16% over time. Conclusions This assessment demonstrated masticatory adaptation immediately after implant rehabilitation with improvements noted up to 3 months after surgery and rehabilitation. It was also observed that, despite gradually improved bite force in all patients, masticatory efficiency and food hardness perception did not necessarily follow this tendency. The findings in this pilot may also be used to assess adaptation of oral function after implant rehabilitation by studying the combined outcome of four tests (occlusal contact, maximum bite force, masticatory efficiency, and food hardness perception).
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Affiliation(s)
- Mihoko Tanaka
- Department of Prosthetic Dentistry, Graduate School of Biomedical Science, Nagasaki University, 1-7-1 Sakamoto, Nagasaki, 852-8588, Japan. .,Centre for Periodontology and Implantology Leuven, IJzerenmolenstraat 110, B-3001, Heverlee, Belgium.
| | - Collaert Bruno
- Centre for Periodontology and Implantology Leuven, IJzerenmolenstraat 110, B-3001, Heverlee, Belgium
| | - Reinhilde Jacobs
- OMFS IMPATH, Department of Imaging & Pathology, University of Leuven, Kapucijnenvoer 33, BE-3000, Leuven, Belgium.,Oral and Maxillofacial Surgery, University Hospitals Leuven, Kapucijnenvoer 33, BE-3000, Leuven, Belgium
| | - Tetsurou Torisu
- Department of Prosthetic Dentistry, Graduate School of Biomedical Science, Nagasaki University, 1-7-1 Sakamoto, Nagasaki, 852-8588, Japan
| | - Hiroshi Murata
- Department of Prosthetic Dentistry, Graduate School of Biomedical Science, Nagasaki University, 1-7-1 Sakamoto, Nagasaki, 852-8588, Japan
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Laguna L, Hetherington MM, Chen J, Artigas G, Sarkar A. Measuring eating capability, liking and difficulty perception of older adults: A textural consideration. Food Qual Prefer 2016. [DOI: 10.1016/j.foodqual.2016.05.013] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Laguna L, Aktar T, Ettelaie R, Holmes M, Chen J. A Comparison Between Young and Elderly Adults Investigating the Manual and Oral Capabilities During the Eating Process. J Texture Stud 2016. [DOI: 10.1111/jtxs.12205] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Laura Laguna
- School of Food Science and Nutrition; University of Leeds; Leeds LS2 9JT U.K
| | - Tugba Aktar
- School of Food Science and Nutrition; University of Leeds; Leeds LS2 9JT U.K
| | - Rammile Ettelaie
- School of Food Science and Nutrition; University of Leeds; Leeds LS2 9JT U.K
| | - Melvin Holmes
- School of Food Science and Nutrition; University of Leeds; Leeds LS2 9JT U.K
| | - Jianshe Chen
- School of Food Science and Bioengineering; Zhejiang Gongshang University; Hangzhou Zhejiang 310018 China
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Laguna L, Barrowclough RA, Chen J, Sarkar A. New Approach to Food Difficulty Perception: Food Structure, Food Oral Processing and Individual's Physical Strength. J Texture Stud 2016. [DOI: 10.1111/jtxs.12190] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Laura Laguna
- Food Colloids and Processing Group, School of Food Science and Nutrition; University of Leeds; Leeds LS2 9JT U.K
| | - Richard Asensio Barrowclough
- Food Colloids and Processing Group, School of Food Science and Nutrition; University of Leeds; Leeds LS2 9JT U.K
| | - Jianshe Chen
- School of Food Science and Bioengineering; Zhejiang Gongshang University; Hangzhou Zhejiang China
| | - Anwesha Sarkar
- Food Colloids and Processing Group, School of Food Science and Nutrition; University of Leeds; Leeds LS2 9JT U.K
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Biting Force and Muscle Activity in Implant-Supported Single Mandibular Overdentures Opposing Fixed Maxillary Dentition. IMPLANT DENT 2016; 25:199-203. [DOI: 10.1097/id.0000000000000374] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Abstract
The degree of interplay among variables in dental implant treatment presents a challenge to randomized clinical trials attempting to answer questions in a timely, unbiased, and economically feasible fashion. Further adding complexity to the different scenarios is the varied implant designs and related bone response, area of implantation, implant bulk material, restoration, abutments and related screws, fixation mode (screwed, fixed, or a combination), and horizontal implant-abutment matching geometry. This article critically appraises the most common mechanical testing methods used to characterize the implant-prostheses complex. It attempts to provide insight into the process of construction of an informed database of clinically relevant questions regarding preclinical evaluation of implant biomechanics and failure mechanisms. The use of single load to failure, fatigue life, fatigue limit, and step-stress accelerated life testing is discussed with emphasis on their deliverables, weaknesses, and strengths. Fractographic analysis and challenges in the correlation between laboratory- and in-service-produced failures of dental ceramics, resin composites, and titanium are introduced. In addition, examples are presented of mechanical characterization studies used in our laboratory to assess some implant-supported rehabilitation variables.
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43
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A quantitative assessment of the eating capability in the elderly individuals. Physiol Behav 2015; 147:274-81. [DOI: 10.1016/j.physbeh.2015.04.052] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Revised: 04/13/2015] [Accepted: 04/28/2015] [Indexed: 11/18/2022]
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Al-Zarea BK. Maximum bite force following unilateral fixed prosthetic treatment: a within-subject comparison to the dentate side. Med Princ Pract 2015; 24:142-6. [PMID: 25612783 PMCID: PMC5588213 DOI: 10.1159/000370214] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2014] [Accepted: 11/30/2014] [Indexed: 11/19/2022] Open
Abstract
OBJECTIVES We evaluated the maximum occlusal bite force (MBF) among individuals with fixed partial dentures compared to the opposite dentate side and determined the relationship between MBF and gender, age, and body mass index (BMI). SUBJECTS AND METHODS A total of 85 subjects (43 males and 42 females, age range 28-66 years) with fixed partial dentures on one side and dentate on the other side participated in the study. The MBF was measured at the first molar area on both sides using a digital hydraulic bite force gauge. The highest MBF value was recorded from three measurements of bite force at each side (with 45-second intervals between measurements). RESULTS The mean MBF was 596.2 ± 76.3 N at the dentate side and 580.9 ± 74.3 N at the fixed partial denture side. The difference was statistically significant (p < 0.05). The MBF values were greater in males as well as in taller and heavier participants. Nevertheless, the BMI had no relationship with MBF values (p >0.05). CONCLUSIONS Within the same subjects, the measured MBF values at the dentate side were higher than those at the fixed partial denture side. Females, lighter, and shorter participants had lower MBF values. Meanwhile, the BMI had no significant relationship to MBF values.
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Affiliation(s)
- Bader K. Al-Zarea
- * Dr. Bader K. Al-Zarea, Department of Prosthetic Dentistry, Faculty of Dentistry, Aljouf University, King Abdelaziz Street, Sakakah 42421 (Saudi Arabia), E-Mail
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Strain characteristics of Marburg double crown-retained implant overdentures compared with bar and ball-retained implant overdentures, with and without a rigid major connector. J Prosthet Dent 2014; 112:1416-24. [PMID: 24969407 DOI: 10.1016/j.prosdent.2014.05.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Revised: 05/10/2014] [Accepted: 05/12/2014] [Indexed: 11/24/2022]
Abstract
STATEMENT OF PROBLEM It is hard to identify the most favorable retainer type and the denture design when considering strain levels around implants and in edentulous ridges for implant overdentures (IOVD). PURPOSE The purpose of this study was to evaluate the strain transmitted to the implants and edentulous ridges by Marburg double crown (MDC)-retained IOVD as opposed to bar and ball-retained IOVD and the efficiency of a rigid major connector in the maxilla. MATERIAL AND METHODS An in vitro maxillary model was prepared with 4 implants, with strain gauges placed distally to each implant and also in the anterior and posterior edentulous ridges. Five overdentures were fabricated for each MDC and each ball and bar attachment retainers. Vertical loads of 280 N were applied bilaterally on the first molar region. Then the palatal bars of each IOVD were disconnected, and loading procedures were repeated for the prostheses. RESULTS No significant difference was observed among the MDC and the bar and ball-retained IOVD, with and without a rigid bar according to the data taken from both the implants and edentulous ridges. However, when the strain values attained from each strain gauge separately were considered, a slight difference was observed around the implants of ball-retained overdentures and in the edentulous ridges of MDC-retained overdentures. CONCLUSIONS Within the limitations of this in vitro study, MDC-retained maxillary overdentures with 4 parallel and symmetrically placed implants can be used safely without a rigid major connector as with bar and ball-retained IOVD with regard to the strains generated in the edentulous ridge and around implants.
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AL-Omiri MK, Sghaireen MG, Alhijawi MM, Alzoubi IA, Lynch CD, Lynch E. Maximum bite force following unilateral implant-supported prosthetic treatment: within-subject comparison to opposite dentate side. J Oral Rehabil 2014; 41:624-9. [DOI: 10.1111/joor.12174] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/23/2014] [Indexed: 11/26/2022]
Affiliation(s)
- M. K. AL-Omiri
- Faculty of Dentistry; University of Jordan; Amman Jordan
| | - M. G. Sghaireen
- Faculty of Dentistry; Department of Prosthetic Dentistry; Aljouf University; Sakaka KSA
| | - M. M. Alhijawi
- Department of Dentistry; Ministry of Health; Amman Jordan
| | | | - C. D. Lynch
- School of Dentistry; College of Biomedical and Life Sciences; Cardiff University; Cardiff UK
| | - E. Lynch
- Warwick Dentistry; Warwick Medical School; University of Warwick; Coventry UK
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Lee HJ, Lee KS, Kim MJ, Chun YS. Effect of bite force on orthodontic mini-implants in the molar region: Finite element analysis. Korean J Orthod 2013; 43:218-24. [PMID: 24228236 PMCID: PMC3822061 DOI: 10.4041/kjod.2013.43.5.218] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2012] [Revised: 03/15/2013] [Accepted: 03/20/2013] [Indexed: 11/10/2022] Open
Abstract
Objective To examine the effect of bite force on the displacement and stress distribution of orthodontic mini-implants (OMIs) in the molar region according to placement site, insertion angle, and loading direction. Methods Five finite element models were created using micro-computed tomography (microCT) images of the maxilla and mandible. OMIs were placed at one maxillary and two mandibular positions: between the maxillary second premolar and first molar, between the mandibular second premolar and first molar, and between the mandibular first and second molars. The OMIs were inserted at angles of 45° and 90° to the buccal surface of the cortical bone. A bite force of 25 kg was applied to the 10 occlusal contact points of the second premolar, first molar, and second molar. The loading directions were 0°, 5°, and 10° to the long axis of the tooth. Results With regard to placement site, the displacement and stress were greatest for the OMI placed between the mandibular first molar and second molar, and smallest for the OMI placed between the maxillary second premolar and first molar. In the mandibular molar region, the angled OMI showed slightly less displacement than the OMI placed at 90°. The maximum Von Mises stress increased with the inclination of the loading direction. Conclusions These results suggest that placement of OMIs between the second premolar and first molar at 45° to the cortical bone reduces the effect of bite force on OMIs.
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Affiliation(s)
- Hyeon-Jung Lee
- Department of Orthodontics, School of Dentistry, Chonnam National University, Gwangju, Korea
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Gonçalves TMSV, Campos CH, Gonçalves GM, de Moraes M, Rodrigues Garcia RCM. Mastication improvement after partial implant-supported prosthesis use. J Dent Res 2013; 92:189S-94S. [PMID: 24158344 DOI: 10.1177/0022034513508556] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Partially edentulous patients may be rehabilitated by the placement of removable dental prostheses, implant-supported removable dental prostheses, or partial implant fixed dental prostheses. However, it is unclear the impact of each prosthesis type over the masticatory aspects, which represents the objective of this paired clinical trial. Twelve patients sequentially received and used each of these 3 prosthesis types for 2 months, after which maximum bite force was assessed by a strain sensor and food comminution index was determined with the sieving method. Masseter and temporal muscle thicknesses during rest and maximal clenching were also evaluated by ultrasonography. Each maxillary arch received a new complete denture that was used throughout the study. Data were analyzed by analysis of variance for repeated measures, followed by the Tukey test (p < .05). Maximum bite force and food comminution index increased (p < .0001) after implant-supported dental prosthesis and implant fixed dental prosthesis use, with the higher improvement found after the latter's use. Regardless of implant-retained prosthesis type, masseter muscle thickness during maximal clenching also increased (p < .05) after implant insertion. Partial implant-supported prostheses significantly improved masseter muscle thickness and mastication, and the magnitude of this effect was related to prosthesis type.
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Affiliation(s)
- T M S V Gonçalves
- Department of Prosthodontics and Periodontology, Piracicaba Dental School, University of Campinas, Avenida Limeira, 901,13414-903, Piracicaba, São Paulo, Brazil
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Shimada A, Hara S, Svensson P. Effect of experimental jaw muscle pain on EMG activity and bite force distribution at different level of clenching. J Oral Rehabil 2013; 40:826-33. [PMID: 23992609 DOI: 10.1111/joor.12096] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/09/2013] [Indexed: 11/30/2022]
Abstract
Bite force at different levels of clenching and the corresponding electromyographic (EMG) activity in jaw-closing muscles were recorded in 16 healthy women before, during and after painful stimulation of the left masseter muscle. Experimental pain was induced by infusion of 5·8% hypertonic saline (HS), and 0·9% isotonic saline (IS) was infused as a control. EMG activity was recorded bilaterally from the masseter and temporalis muscles, and static bite force was assessed by pressure-sensitive films (Dental Pre-scale) at 5, 50 and 100% of maximal voluntary contraction (MVC) during each session. Visual feedback was applied by showing EMG activity to help the subject perform clenching at 5, 50 and 100% MVC, respectively. EMG activity at 100% MVC in left and right masseter decreased significantly during painful HS infusion (1·7-44·6%; P < 0·05). EMG activity at 5% and 50% MVC was decreased during HS infusion in the painful masseter muscle (4·8-18·6%; P < 0·05); however, EMG activity in the other muscles increased significantly (18·5-128·3%; P < 0·05). There was a significant increase in bite force in the molar regions at 50% MVC during HS infusion and in the post-infusion condition (P < 0·05). However, there were no significant differences in the distribution of forces at 100% MVC. In conclusion, experimental pain in the masseter muscle has an inhibitory effect on jaw muscle activity at maximal voluntary contraction, and compensatory mechanisms may influence the recruitment pattern at submaximal efforts.
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Affiliation(s)
- A Shimada
- Section of Clinical Oral Physiology, Department of Dentistry, Aarhus University, Aarhus, Denmark
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Strain Distribution in a Kennedy Class I Implant Assisted Removable Partial Denture under Various Loading Conditions. Int J Dent 2013; 2013:351279. [PMID: 23737788 PMCID: PMC3657413 DOI: 10.1155/2013/351279] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2013] [Accepted: 03/19/2013] [Indexed: 11/18/2022] Open
Abstract
Purpose. This in vitro study investigates how unilateral and bilateral occlusal loads are transferred to an implant assisted removable partial denture (IARPD). Materials and Methods. A duplicate model of a Kennedy class I edentulous mandibular arch was made and then a conventional removable partial denture (RPD) fabricated. Two Straumann implants were placed in the second molar region, and the prosthesis was modified to accommodate implant retained ball attachments. Strain gages were incorporated into the fitting surface of both the framework and acrylic to measure microstrain (μStrain). The IARPD was loaded to 120Ns unilaterally and bilaterally in three different loading positions. Statistical analysis was carried out using SPSS version 18.0 (SPSS, Inc., Chicago, IL, USA) with an alpha level of 0.05 to compare the maximum μStrain values of the different loading conditions. Results. During unilateral and bilateral loading the maximum μStrain was predominantly observed in a buccal direction. As the load was moved anteriorly the μStrain increased in the mesial area. Unilateral loading resulted in a twisting of the structure and generated a strain mismatch between the metal and acrylic surfaces. Conclusions. Unilateral loading created lateral and vertical displacement of the IARPD. The curvature of the dental arch resulted in a twisting action which intensified as the unilateral load was moved anteriorly.
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