Amal Moubarak

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...

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 4th year and 33 from 6th 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 4th&6th year students respectively suffered from graded chronic pain (GCP) between (I:III) pain-related-dis...

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...

Background/aim Cap micro-movement may affect load transfer to the osseointegrated implant/bone interface, which in turn may affect the selection of attachment type to ensure the least amount of bone loss, fewer maintenance periods, and longer lifetime of the entire implant/attachment system. This study aimed to evaluate the cap micro-movement effect using various implant angulations on the selection of the best attachment system for each individual case. Materials and methods Six finite element models were prepared and were equally divided between locator attachment and ball attachment. Every three models simulate vertical implant and inclined implants by 10° and 20° of angulation, respectively. Meanwhile, frictional contact enabling cap micro-movement at the cap/attachment interface was implemented. Results Nonlinear static analysis results showed that implant and locator attachment body received very low stresses in comparison to the ball attachment. Nylon cap life expected to be longer in the case of 20° angulated implant with ball attachment, while all other cases indicated locator attachment superiority. Cortical bone received less stresses under locator attachment, while the gap in stress values in comparison to ball attachment will be reduced by increasing implant angulation. Conclusions Locator attachment seems to be more superior to ball attachment. However, increasing implant angulation up to 20° may result in showing a similar behavior with both attachment types.

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...

Although the evidence is clear on the long-term effects of removable partial dentures (RPDs) on the periodontal health of abutment and non-abutment teeth, little work has been done on the periodontal outcomes of the remaining teeth previously treated with periodontal therapy. The aim of this study was to evaluate the effect of denture loading on teeth previously exposed to periodontal treatment with additional photo-disinfection. Twelve partially edentulous patients classified as having mandibular Kennedy Class I arches were included. In each quadrant of the mandibular arch, the terminal abutment was diagnosed to have untreated chronic periodontitis. Initially, all the affected abutments received a conservative periodontal treatment in form of scaling and conventional root debridement. Patients were randomly received additional treatment with photodynamic therapy in one of the mandibular quadrants (test group). After the periodontal treatment, a 4-week load-free period was planned. ...

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...