View clinical trials related to Mouth, Edentulous.
Filter by:In this study, it was aimed to compare the impressions taken with different impression techniques for the production of tissue-supported complete dentures from individuals with complete edentulous upper jaws. For this purpose, 15 individuals with complete edentulism in the upper jaw were asked to participate in the study. In addition to agreeing to participate in the study after reading the consent form, these individuals should have been using tissue-supported complete dentures in the upper jaw for at least 3 months. They should also have healthy mucosa without local factors such as tissue hyperplasia, atrophic crests, allergic reaction, epulis fissuratum. A total of five final impressions will then be taken from these individuals in two sessions. Two of these impressions will be obtained with the traditional method and three with the digital method. The traditional impression group will include one-step (ALG) and two-step (ZOE) impression techniques. The digital impression group will include the digital impression taken when the artificial intelligence is deactivated (A.I OFF), the digital impression taken when the artificial intelligence is activated (A.I ON) and the modified technique (MOD). In the first appointment, the first impressions will be taken for the traditional and digital groups. Intraoral exclusion and isolation will be provided before the digital first impression. With the A.I mode of the intraoral scanner (TRIOS4; 3Shape A/S, Copenhagen, Denmark) deactivated, scanning will be performed in accordance with the scanning protocol recommended by the company. A metal stock tray suitable for the dental arch will then be selected for the preliminary impression of the traditional impression group. The impression will be taken in one step with irreversible hydrocolloid impression material. The impression will be digitized with the same intraoral scanner within the first 10 minutes after impression taking. Both impressions will be digitally transferred to the dental laboratory as stl data. Using computer aided design (CAD) software (Exocad DentalCAD 2.4 Plovdiv), an individual tray will be designed for the ZOE impression in the traditional group and a pedestal for the MOD impression in the digital impression group. The designs will be transferred to the computer aided manufacturing (CAM) unit and produced with a 3D printer using dental resin. The occlusal-rim (OR) will be prepared by adding wax on the base. In the second appointment, the cheek and lips will be excluded in the same way before scanning. For A.I OFF and A.I ON, recordings will be taken when the artificial intelligence is deactivated and activated, respectively. Then, occlusal vertical dimension, intermaxillary relationship and aesthetic parameters will be determined with OR before scanning for the MOD group. Reference areas will be created on the buccal and palatinal walls to facilitate scanning of the OR. To avoid retention problems during scanning, a silicone-based impression material with a fluid consistency will be applied to the tissue surface of the OR and placed in the mouth. Scanning will be performed according to the protocol proposed by Lo Russo et al. For the traditional impression group, the ALG impression will be taken with a metal stock tray using irreversible hydrocolloid impression material in a single step. The impression will be digitized with an intraoral scanner within ten minutes of completion. Then, the edges of the individual tray for ZOE will be shaped with impression compound to ensure peripheral closure. The impression will be completed with zinc-oxide eugenol impression material. The impression will be digitized. These measurements will then be compared using a reverse-engineering program (Geomagic design X version 2016.1.0, 3D Systems Inc. Rock Hill, SC). Before the comparison, in the same program, the parts to be evaluated on the ZOE in the conventional group and A.I OFF in the digital group will be divided into regions. These areas will be divided into four sections as right and left vestibular region, postdam area, hard palate region, except for the A.I OFF-MOD comparison group. In the A.I OFF-MOD comparison group, it will include the right and left initial areas, including the areas where scanning starts in the second scan of the MOD method. In addition, all measurements will be compared in terms of the whole surface and all measurement boundaries including the whole measurement surface as one. The comparison groups are ZOE-ALG, ZOE-A.I OFF, A.I OFF-A.I ON, A.I OFF-MOD. The measurements in the comparison groups will be overlapped first with the initial alignment and then with the best fit alignment algorithm. All sections will be evaluated individually with the "3D compare" feature and the amount of deviation in the areas to be evaluated will be determined.
The aims of this clinical study are: 1) to compare the accuracy of conventional versus digital impression techniques for implant impressions; 2) to assess the passive fit of the prosthesis constructed from the most accurate impression. Thirty edentulous patients who received 4 - 6 implant and indicated for implant-supported fixed prosthesis will be invited. Full-arch conventional and digital impressions will be made for each patient. Accuracy evaluation will be made and the prosthesis will be constructed from the most accurate impression. Passive fit of the zirconia implant-supported prostheses will be verified at the try-in stage clinically and radiographically.
Extraction socket preservation is defined as alveolar ridge preservation within the bone envelope remaining after tooth extraction, meanwhile ridge augmentation is defined as increasing the volume of alveolar ridge beyond the bony envelope at the time of tooth extraction. It is recommended to use in cases where extraction socket anatomy is intact. In contrast definition "extraction socket augmentation" defines alveolar ridge restoration when bony walls of the socket are partly or completely lost. In the case of severe loss (> 50%) of the buccal bone plate, preservation of hard tissue with a prolonged healing time before implant placement has been suggested. The null hypothesis of this experimental work states that: (i) the two different bone graft materials gained the same amount of bone following horizontal ridge augmentation procedure; (i) the two different bone graft materials exhibit similar histological and histomorphometric results Therefore, the main purpose of the current study is to compare two different biomaterials using guided bone regeneration procedures in the ridge preservation/ augmentation (hard-tissue preservation).
Forty patients ( 24female and16 male )with completely edentulous maxilla and mandible . All patients received implant supported mandibular and maxillary overdentures. The patients were randomly divided into two groups according to attachments retaining Max IOD that supported by four axial implants in maxilla . The TA was used to retain group I (GrI) MaxIOD , while that of group II (Gr II) was retained by LA. MaxIOD retention and MBL(vertical and horizontal) around implants of both groups was recorded at time of insertion (R0) ,then twelve(R12)and (R24) months following insertion of the prosthesis.
To compare the accuracy of digital impression and conventional impression for complete-arch implant-supported fixed prosthesis
Fourteen completely edentulous patients were selected to participate in this study. From the outpatient clinic of Prosthodontic Department, Faculty of Dentistry, Ain Shams University. After fabrication of complete denture for all patients, patients were randomly divided to: Group A: Seven patients were rehabilitated with implant retained maxillary overdenture where four Straumann BLX® implant were inserted opposed by mandibular complete denture. Group B: Seven patients were rehabilitated with implant retained maxillary overdenture where four conventional acid etched implants were inserted opposed by mandibular complete denture. After implant placement using surgical guide, smart peg and ostell device were used to measure the primary stability of the implant then cover screw was placed and after six weeks, secondary stability was measured for both groups. After four months, the second stage started in which exposure of the implant fixtures took place and pick up was carried out. Patients were recalled frequently for post-insertion inspection and adjustment.
Our study looks into how the thickness of the gum tissue affects the health of the bone around dental implants over ten years. We include 59 people and divide them into three groups based on their gum tissue thickness. Some have naturally thin gums, some have thin gums that were made thicker with a special procedure, and some already had thick gums. We try to find out if having thicker gums, whether naturally or through enhancement, can help keep the bone around dental implants healthy in the long run.
The goal of this split-mouth randomized clinical trial study was to investigate the effect of using a laser on pain and discomfort following flapless dental implant surgery. It was hypothesized that laser did not have any impact on post-op pain. Therefore, the study aimed to compare pain and discomfort following flapless dental implant surgeries with or without a laser.
The dental implant placed freehand with a digital planing is vastly increasing. The accuracy between the planned and the placed implants still not well determined. Between a single implant and a full mouth rehabilitation, the precision is very wide. A precision scale must be settled according to each indication in order to offer the clinician a safety and a predictability for his procedures.
To evaluate the clinical and radiographic outcomes of KS implants used to rehabilitate edentulous mandible with dental-retained overdentures, and to compare it with same treatment on TS implants