BACKGROUND: Utilization of attachments in a removable partial denture is highly essential not only as a line of treatment but also as it has a remarkable impact on the denture’s durability during the function. The attachment should act as a stress breaking system preserving the abutment teeth. AIM: This consideration aimed to verify the convention of polyether ether ketone (PEEK) material as an attachment. MATERIAL AND METHODS: Four groups of different materials for both attachments and partial denture framework were fabricated and tested using strain gauges to compare between them according to the strains originated around both the abutment teeth and edentulous area. RESULTS: PEEK material is one of the esthetic materials used for fabrication of the framework of the RPD. On using it as a precision attachement is shows favorable stress distribution decreasing the strains around the abutment teeth and the alveolar ridge especially distal to the abutment teeth that was significantly reduced in comparison with the other treatment options. CONCLUSION: Utilization of PEEK material as both an attachment and framework decline the strains performed around the abutment teeth and over the edentulous ridge.

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BACKGROUND:Patient’s satisfaction and the preservation of abutments is the most important outcomes that the clinician seeks during fabrication of any dental treatment, especially when it is concerned with removable prosthodontic rehabilitation.AIM:The present study evaluates three different Removable Partial Denture (RPD) types restoring mandibular class II modification I edentulous cases with regards to patient’s satisfaction and abutments survival.METHODS:Forty-two partially edentulous patients were divided into three groups (Group I rehabilitated with Vitallium RPD, Group II rehabilitated with Vitallium RPD where the modification area restored with the surveyed bridge, Group III rehabilitated with Thermopress RPD). The patients were followed up for twenty-four months. Using a questionnaire, prosthodontic maintenance required was documented at the delivery and after 3 months.RESULTS:There was a significant difference regarding patient satisfaction for group III (P-value <0.05) while for groups I and II there was a non-significant difference (P-value >0.05). Regarding the survival rate, there was a non-significant difference between the three groups (P-value >0.05) at the end of twenty-four months of follow up.CONCLUSION:Patient satisfaction and abutment survival were better with Thermopress RPD than conventional Vitallium RPD or Vitallium RPD with a surveyed bridge restoring the modification area. Although a non-statistically significant difference was found in the survival rate of abutments between groups, a clinically important result was revealed as no abutments failures were reported in the Thermopress group.

BACKGROUND:Retainers are of great importance for the longevity of the prosthetic removable partial denture during various functions especially the esthetic one. The key of successful clasp selection is to select a direct retainer that will control tipping and torquing forces on the abutment teeth, provide retention against reasonable dislodging forces and are compatible with both tooth and tissue contour together with the aesthetic desire of the patient.AIM:This study aims to compare different clasp material to enhance the choice of the clasp based on the aesthetic point of view.METHODS:The colour evaluation of the tested materials had been evaluated by computer aided technique with digital camera with 3 Mega Pixels of resolution.RESULTS:In the current research, the technique of colour evaluation was carried out to compare different clasp materials to enhance the choice of the clasp based on the aesthetic point of view. Most commonly, Removable Partial Denture (RPD) retainers are fabricated identically from the metal framework’s alloy as Cobalt Chromium (CoCr) alloy although it is unaesthetic. This esthetic problem has been overcome by other methods and by utilising different materials, these included covering the retainers with tooth-coloured acrylic resin, as well as the introduction of esthetic materials as; Thermoplastic Acetal, Versacryl, and Thermopress.CONCLUSION:It has been concluded that the non-metallic Acetal resin clasp shows superior physical properties regarding colour stability.

BACKGROUND:Removable partial denture’s clasp is of particular importance as it affects the denture longevity during the function. The key of successful clasp selection is to select a direct retainer that will control tipping and torquing forces on the abutment teeth, provide retention against reasonable dislodging forces and are compatible with both tooth and tissue contour and the aesthetic desire of the patient. In this consideration, different materials employed for the clasp construction were compared mechanically.AIM:This study aims to compare the most usable esthetic clasps mechanically to clarify the most suitable material to be used as partial denture clasps.METHODS:Evaluation of surface roughness, retention and deformation has been investigated utilising different in-vitro methods. All these techniques provide valuable information regarding the mechanical properties of the materials tested. However, none of the in-vitro techniques can expose the tested materials to conditions similar to that of the oral environment (in-vivo) such as pH value and temperature variations.RESULTS:Most commonly, RPD clasps are fabricated from the same alloy of the metal framework, as cobalt-chromium (CoCr) alloy although it is unaesthetic. Other methods consumed to avoid such esthetic mystery have included coating retainers with tooth-coloured resin or introduction of esthetic materials as Thermoplastic Acetal, Versacryl, and Thermopress.CONCLUSION:It has been concluded that the non-metal Acetal resin retainer reveals superior mechanical properties.

Aim:The purpose of this study was to evaluate clinical and radiographic results of implant supported fixed prosthesis with and without cantilever extensions for "All on four" implant rehabilitation of atrophied mandible. Materials and methods:Ten completely edentulous individuals with atrophied mandibular ridges were classified into 2 groups: 1) Group I: included 5 patients with posteriorly placed mental foramen, 2) Group II: included 5 patients with anteriorly placed mental foramen. All participants were managed by 4 implants according to the "All on four" protocol using a Nobel Biocare metal guide and open flap surgery. Implants were immediately loaded by existing mandibular dentures. Group I restored with fixed prosthesis without cantilevers, and group II restored with fixed prosthesis with distal short cantilevers. Plaque and gingival index, probing depth, implant mobility and bone loss (using cone beam CT) were evaluated after prosthesis delivery (T0), six months (T6) and 12 months (T12) after delivery Results: For posterior implants, group II showed significant higher plaque index, and gingival index than group I after 6 and 12 months. No differences in probing depth, implant mobility and bone resorption between groups was noted for anterior and posterior implants. Posterior implant showed significant higher plaque scores (for both groups) and gingival scores (for group II) than anterior implants after 6 and 12 months. Posterior implant showed significant higher pocket depth for both groups. Conclusion:Within the limitation of this study, fixed prosthesis with short cantilever can be used successfully to rehabilitate patients with atrophied mandibular ridges and anteriorly placed mental foramen with "All on four" concept as it was associated with favourable clinical and radiographic outcomes similar to prosthesis without cantilevers

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