To date, masticatory laterality has not been fully examined as a parameter for evaluating tempro-... more To date, masticatory laterality has not been fully examined as a parameter for evaluating tempro-mandibular disorders (TMD).This cross-sectional study included160 fully dentate dental professionals (mean 27 years old). Masticatory laterality was evaluated by using the observed preferred chewing side test. Muscle pain, tempro-mandibular joint (TMJ) pain, clicking, ranges of vertical and lateral mouth opening and deviation during mouth opening were also evaluated. Chi-square tests were used for statistical analyses; p ≤ 0.05 was considered significant. The prevalence of masticatory laterality among the study participants was 60%; 86.5% of the participants with masticatory laterality chewed on the right side. Forty percent of the participants chewed bilaterally. Of the symptoms evaluated, deviation was the most common symptom among participants with TMD and masticatory laterality (69.1%-65.5%), followed by clicking (66.1% of participants with TMD and62.5% of those with masticatory late...
This research study was performed to explore the behavior of acrylic resin denture base material ... more This research study was performed to explore the behavior of acrylic resin denture base material during impact loading with molded versus machined notching under different temperatures. Two forms of notching (molded and machined) were done equally in all specimens. Then, each group was subdivided into eight subgroups according to the subjected degree of temperatures. The selected temperatures (0, 10, 18, 28, 45, 55 and 70°c) were chosen to cover a wide range similar to actual service temperatures. All specimens were soaked in distilled water at the designated temperatures. One hour and two hours were chosen as the time for soaking and the results of both were recorded. The results revealed a slight increase of fracture energy was developed with initial increase of temperature then followed by a decrease in fracture energy with further increase of temperature. An explanation of fracture energy increase is due to the increase of internal frictional resistance of polymer chains movemen...
Statement of the problem: After conversion of unmodified Kennedy class II partially edentulous ca... more Statement of the problem: After conversion of unmodified Kennedy class II partially edentulous cases into Kennedy class III by single implant placed in the lower first molar area, does restoration by unilateral clasp retained side plate or precision attached one affect the masticatory performance of the patient or not? Purpose: This study was done to investigate the. alteration of the electromyographic.(EMG) activity of the massseter muscles following the use of two different designs of implant-tooth borne unilateral partial denture. Materials and methods: Within-subject comparison of unilateral attachment retained partial denture(ARPD) and clasp retained partial denture (CRPD) was done. The EMG activity was measured before denture insertion, two weeks (2w), two months (2m) and four months (4m) after insertion of the precision attached partial denture. Then the clasp retained side plate was inserted and the EMG activity was recorded at the same time intervals for masseter muscles of...
Open Access Macedonian Journal of Medical Sciences, 2021
BACKGROUND: Incomplete implant osseointegration may affect the choice of the type of attachment t... more BACKGROUND: Incomplete implant osseointegration may affect the choice of the type of attachment to ensure less amount of bone resorption, periods of maintenance, and longer implant/attachment life-time. AIM: The aim of this study was to evaluate, using 3D FE analysis (FEA), the influence of two different types of attachments on the rate of bone resorption, need for maintenance and implant/attachment life time in cases of unpredictable osseointegration in various bone types and using different implant angulations. METHODS: Six finite element models were prepared; three for the locator attachment while the other three for the ball attachment. Each of the three models simulates vertical implant and inclined implants by 10° and 20° degrees. Frictional contact between implant and cortical bone simulated the incomplete osseointegration scenario. RESULTS: Non-linear static analysis results showed that locator attachment and its cap may have longer time life in comparison with the ball atta...
Objectives: To evaluate prevalence of Research Diagnostic Criteria for Temporomandibular Disorder... more Objectives: To evaluate prevalence of Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD) in King Abdulaziz University dental students and to study the relation between going further in studying dental program and TMD-psychological profile. Methods: Cross sectional study with randomly selected 64 female dental students (31 from 4 th year and 33 from 6 th year), was conducted in King Abdulaziz University-Faculty of Dentistry. The survey was done using (RDC/TMD) tool which consists of axis I (physical assessment, 84-item questionnaire and clinical examination for TMJ and muscles) and axis II (psychosocial and pain-related disability assessments depending on symptom checklist 90 (SCL-90). Results: Regarding distribution of axis I, it was found that 6.1-27.9-21.4% of the participants suffered from group I, II, III respectively. Regarding axis II, (25.8-27.2%) of 4 th &6 th year students respectively suffered from graded chronic pain (GCP) between (I:III) pain-related-disability grades. 48.1% of 4 th year student in contrast to 87.7% of 6 th year's showed higher depression scores with significant difference. Conclusion: RDC-TMD is a valuable tool for diagnosing TMD with different subgrouping. The distribution of RDC-TMD among dental students is (6.1-27.9-21.4%) in regards to (muscle disorder, disc displacements, other joint disorders) respectively. The psychological profile scores (depression and somatization) increase with going further into studying dental school program which denotes that older dental students suffer from more stress than young ones.
To date, masticatory laterality has not been fully examined as a parameter for evaluating tempro-... more To date, masticatory laterality has not been fully examined as a parameter for evaluating tempro-mandibular disorders (TMD).This cross-sectional study included160 fully dentate dental professionals (mean 27 years old). Masticatory laterality was evaluated by using the observed preferred chewing side test. Muscle pain, tempro-mandibular joint (TMJ) pain, clicking, ranges of vertical and lateral mouth opening and deviation during mouth opening were also evaluated. Chi-square tests were used for statistical analyses; p ≤ 0.05 was considered significant. The prevalence of masticatory laterality among the study participants was 60%; 86.5% of the participants with masticatory laterality chewed on the right side. Forty percent of the participants chewed bilaterally. Of the symptoms evaluated, deviation was the most common symptom among participants with TMD and masticatory laterality (69.1%-65.5%), followed by clicking (66.1% of participants with TMD and62.5% of those with masticatory late...
This research study was performed to explore the behavior of acrylic resin denture base material ... more This research study was performed to explore the behavior of acrylic resin denture base material during impact loading with molded versus machined notching under different temperatures. Two forms of notching (molded and machined) were done equally in all specimens. Then, each group was subdivided into eight subgroups according to the subjected degree of temperatures. The selected temperatures (0, 10, 18, 28, 45, 55 and 70°c) were chosen to cover a wide range similar to actual service temperatures. All specimens were soaked in distilled water at the designated temperatures. One hour and two hours were chosen as the time for soaking and the results of both were recorded. The results revealed a slight increase of fracture energy was developed with initial increase of temperature then followed by a decrease in fracture energy with further increase of temperature. An explanation of fracture energy increase is due to the increase of internal frictional resistance of polymer chains movemen...
Statement of the problem: After conversion of unmodified Kennedy class II partially edentulous ca... more Statement of the problem: After conversion of unmodified Kennedy class II partially edentulous cases into Kennedy class III by single implant placed in the lower first molar area, does restoration by unilateral clasp retained side plate or precision attached one affect the masticatory performance of the patient or not? Purpose: This study was done to investigate the. alteration of the electromyographic.(EMG) activity of the massseter muscles following the use of two different designs of implant-tooth borne unilateral partial denture. Materials and methods: Within-subject comparison of unilateral attachment retained partial denture(ARPD) and clasp retained partial denture (CRPD) was done. The EMG activity was measured before denture insertion, two weeks (2w), two months (2m) and four months (4m) after insertion of the precision attached partial denture. Then the clasp retained side plate was inserted and the EMG activity was recorded at the same time intervals for masseter muscles of...
Open Access Macedonian Journal of Medical Sciences, 2021
BACKGROUND: Incomplete implant osseointegration may affect the choice of the type of attachment t... more BACKGROUND: Incomplete implant osseointegration may affect the choice of the type of attachment to ensure less amount of bone resorption, periods of maintenance, and longer implant/attachment life-time. AIM: The aim of this study was to evaluate, using 3D FE analysis (FEA), the influence of two different types of attachments on the rate of bone resorption, need for maintenance and implant/attachment life time in cases of unpredictable osseointegration in various bone types and using different implant angulations. METHODS: Six finite element models were prepared; three for the locator attachment while the other three for the ball attachment. Each of the three models simulates vertical implant and inclined implants by 10° and 20° degrees. Frictional contact between implant and cortical bone simulated the incomplete osseointegration scenario. RESULTS: Non-linear static analysis results showed that locator attachment and its cap may have longer time life in comparison with the ball atta...
Objectives: To evaluate prevalence of Research Diagnostic Criteria for Temporomandibular Disorder... more Objectives: To evaluate prevalence of Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD) in King Abdulaziz University dental students and to study the relation between going further in studying dental program and TMD-psychological profile. Methods: Cross sectional study with randomly selected 64 female dental students (31 from 4 th year and 33 from 6 th year), was conducted in King Abdulaziz University-Faculty of Dentistry. The survey was done using (RDC/TMD) tool which consists of axis I (physical assessment, 84-item questionnaire and clinical examination for TMJ and muscles) and axis II (psychosocial and pain-related disability assessments depending on symptom checklist 90 (SCL-90). Results: Regarding distribution of axis I, it was found that 6.1-27.9-21.4% of the participants suffered from group I, II, III respectively. Regarding axis II, (25.8-27.2%) of 4 th &6 th year students respectively suffered from graded chronic pain (GCP) between (I:III) pain-related-disability grades. 48.1% of 4 th year student in contrast to 87.7% of 6 th year's showed higher depression scores with significant difference. Conclusion: RDC-TMD is a valuable tool for diagnosing TMD with different subgrouping. The distribution of RDC-TMD among dental students is (6.1-27.9-21.4%) in regards to (muscle disorder, disc displacements, other joint disorders) respectively. The psychological profile scores (depression and somatization) increase with going further into studying dental school program which denotes that older dental students suffer from more stress than young ones.
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