Lower Overdenture Research Articles

Ectodermal Dysplasia: A Case Report

Ectodermal Dysplasia (ED) is a rare genetic disorder characterized by the aberrant development of ectodermal structures, presenting complex dental, dermatological, and psychological challenges. This case report focuses on a 7-year-old male with ED, delving into his prenatal, natal, and postnatal history, medical and dental records, clinical examination findings, and the subsequent treatment plan. The patient exhibited classical ED features, including missing teeth, dry and fragile skin, prominent lips, cranial abnormalities, reduced facial height, and an enlarged tongue. A multidisciplinary team approach was pivotal in addressing the intricate dental complications associated with ED. Preventive measures such as meticulous oral hygiene, periodic high-fluoride applications, and resin-modified glass ionomer fissure sealants were administered. Prosthodontic interventions were designed to restore function and aesthetics, including upper partial denture and lower overdenture. This case underscores the significance of early and comprehensive dental intervention in ED patients, emphasizing the vital roles played by pediatrics, orthodontics, prosthodontics, surgery, and periodontics in achieving favorable outcomes. Furthermore, it highlights the psychosocial challenges faced by ED individuals, emphasizing the need for holistic care and support.

Effect Of Polyetheretherketone (PEEK) As Denture Base Material On Peri-Implant Bone Level Changes In Implant Bar Retained Overdenture Using CAD/CAM Technology

Objectives: This research was carried out to evaluate the effect of Polyetheretherketone (PEEK) as denture base material on peri-implant crestal bone level changes in edentulous patients rehabilitated with implant-supported primary-secondary bar overdenture and retained attachments attached the body of the bar constructed by CAD / CAM technology. Materials and Methods: Twenty completely edentulous patients complaining from insufficient retention of their mandibular denture were selected to participate in this study. All the patients were rehabilitated with an implant-supported bar overdenture. For All patients three implants (3.7mm) in diameter (11mm) in length were inserted in the interforamenal region using computer guided surgical template. Four months later, Cast bar with two semi precession attachment at the distal ends of the bar was constructed, The cast bar was scanned using bench laser scanner to obtain virtual model with the bar, the housing on the top of the bar and the female part of the attachment was designed using computer aided designing (CAD) the meld into wax by computer aided manufacturing (CAM). The CAD/ CAM wax pattern of housing and the female part of the attachments were transferred into acetal resin using the injection molded technique. Overdentures were constructed for all patients following the conventional technique. According to the denture base material, a toss coin was made to randomly divided the patients into two equal groups; group I received mandibular implant-retained overdenture were processed using heat cured acrylic resin, following the long curing cycle (heated at 78C° for eight hours), while for group II Polyetheretherketone (PEEK) lower overdenture was constructed, using the injection-molding technique. Radiographic evaluation of peri-implant bony changes was made using standardized long cone paralleling technique with custom made acrylic template and the Rinn-xcp at insertion, six, twelve and twenty four months were measured and statistically analyzed. The significant level was set at P ≤ 0.05P . ANOVA for repeated measures test was used to compare between follow up periods within groups and when statistically significant it was followed by simple main effect analysis with Bonferioni correction. One way ANOVA test was used to compare between groups at different follow up periods. Results. Both groups showed a statistically insignificant increase loss in crestal bone height around the implants. Although the data obtained from table1 revealed increase in the amount of bone changes for group I and Group II compared to group I during the follow up period statistical analysis of the data using ANOVA test for repeated measures revealed no significance difference(P ≥ 0.05) .Conclusion: CAD/ CAM technology and use of Polyetheretherketone (PEEK) as denture base material should be considered whenever possible to preserve the implant supporting structures in implant bar retained overdenture.

"Combination Syndrome" in an Upper/Lower Implant Overdenture Patient: A Clinical Report.

An upper/lower overdenture case, which presented with clinical entities commonly associated with the combination syndrome, is described. To the author's knowledge, this is the first documented case to illustrate such a particular association. The patient presented with an upper overdenture on 4 individual implants with attachments, without palatal coverage, opposing a lower bar overdenture on 4 implants, delivered more than 10 years before presentation. The patient complained about esthetics (poor display of upper teeth, excessive showing of lower teeth, and occlusal plane cant) and chewing. The anterior maxilla had severe bone loss, whereas the anterior mandible had a large amount of bone. Our retreatment included an upper overdenture with palatal coverage and a lower overdenture, both prostheses supported by individually attached implants. The article describes in detail the reasoning behind chosen retreatment, along with limitations and compromises.

Evaluating the influence of different soft liners Retaining mini implant supported mandibular over denture on the marginal bone height

Introduction: Using a soft liner-retained implant-supported overdenture offers the restorative dentist a treatment option when the number, location, or angulation of dental implants placed may differ from the original treatment plan. The aim of the present study was to evaluate the marginal bone height changes in mini-implant supported overdentures using different retaining denture soft-liners.Patients & Methods: Twenty-one completely edentulous cases were selected for this study. The patients were allocated into one of the three treatments groups. In group I the lower overdenture was relined with “acrylic based soft liner”; group II the lower overdenture was relined with “silicon based soft liner’’, while in group III: the lower overdenture was relined with ‘’Retention Sil 200’’. Patients in all groups received CBCT immediately after the implant loading, 6 months and 12months after insertion of partial overdenture. Each implant was evaluated for the marginal bone level. Results: The Silicon, Retention Sil 200 and acrylic based soft liners showed a statistical significant difference in the amount of bone resorption. Conclusion: the current study concluded that Silicon and acrylic based soft liners show significant difference in their effect on the supporting bone due to stresses transmitted to mini-implant retained mandibular over dentures. Retention. Sil resilient liners cannot be considered as a permanent mean of retention for mini implant retained mandibular but it shows high success for short- and medium-term management.

Chewing efficiency and electromyographic activity of masticatory muscles with two different system attachments with lower overdentures

Chewing efficiency and electromyographic activity of masticatory muscles with two different system attachments with lower overdentures

Teeth restoration for overdenture support

Introduction. If patients have remained only a few teeth in one jaw, these teeth can be retained and specifically prepared to bear mobile supradental prosthesis i.e. overdenture (OD). The patients are usually very motivated to preserve remained teeth. The aim of this study was to present the plan, the preparation procedure and the treatment protocol for the remaining teeth that will bear full mobile OD. Material and Methods. Study included 12 patients and 23 remaining teeth. Treatment plan considered: radiological analysis and selection of the remaining teeth, reduction of the clinical crown of the teeth, endodontic and periodontal treatment and finally conservative or prosthodontic restoration of these teeth. Fifteen teeth were restored using cast crown build-up (cap) and eight teeth were restored with amalgam restorations. Patients who received twelve lower mobile full OD were observed for one year to assess the integrity of the extra alveolar tooth structure. Results. After observation period of one year, the integrity of crown restorations was maintained as well as the alveolar bone height. Conclusion. The restoration of the remaining teeth using cast crown build-up (cap) and amalgam is very important for maintaining extra alveolar tooth structure and successful treatment with overdentures.

Computer-Guided Implant Placement in a Patient With Severe Atrophy

Computer software associated with imaging techniques facilitates diagnosis, planning, and management in cases of severe maxillary atrophy, by reducing the incidence of complications and improving the postoperative course and functional outcome. This article reports on a case of a 66-year-old woman with maxillary atrophy. Computer software was used to plan and position 6 maxillary and 4 mandibular implants, taking maximum advantage of the remaining bone. Bicorticalization was sought by angulation and implant fixation in the buttresses, while rehabilitation was carried out by means of a fixed screw-retained upper prosthesis and a lower overdenture. No implants were lost after 36 months of follow-up. This technique optimized precise implant placement as planned without the need for more complex reconstruction techniques.

Fixed rehabilitation of a patient with hypohidrotic ectodermal dysplasia using zygomatic implants

We found few references in the dental literature on implant rehabilitation of patients with hypohidrotic ectodermal dysplasia and only 1 case on zygomatic fixations and maxillary prosthesis in a patient with hypohidrotic ectodermal dysplasia. Two zygomatic fixations were placed according to the sinus slot technique, together with 3 implants in the anterior maxillary region. After 6 months, an upper complete prosthesis was screwed onto the implants, and lower overdentures were placed over the remnant canines. After 18 months of follow-up the patient reported important improvement in oral function and self-esteem.