A. Tripodakis - Academia.edu (original) (raw)
Papers by A. Tripodakis
Journal of Osseointegration, 2017
Aim Intraoral welding has been introduced as a means to fabricate a rigid implant-splinting metal... more Aim Intraoral welding has been introduced as a means to fabricate a rigid implant-splinting metal framework supporting immediate implant prostheses. Methods This method can also be applied for the immediate transformation of a removable lower full prosthesis, with inadequate retention and stability, into a fixed implant supported rehabilitation. In this way it was possible to preserve the correct esthetic and occlusal parameters that had been previously established and to which the patient has been accustomed. The prosthesis is modified by removing the denture flanges. The remaining part of the denture teeth, are joined together with the acrylic resin representing the gingiva and forming a bare dental arch composition. After implant placement, the Ti framework is fabricated by initial intraoral welding, followed by extra-oral completion. The denture is then stabilized with acrylic resin onto the framework intraorally. The prosthesis is completed with additional acrylic resin in the ...
The International journal of prosthodontics
The strength and mode of failure of three different designs of custom-made all-ceramic implant ab... more The strength and mode of failure of three different designs of custom-made all-ceramic implant abutments fabricated by milling of In-Ceram sintered ceramic blocks were compared with the conventional CeraOne system under static load. Four test groups were formed with different locations of abutment screws. In three test groups, In-Ceram crowns were fabricated for placement on the all-ceramic abutments, and in one test group, a veneer porcelain was fired directly on the abutment; crowns in the control group were fabricated using the CeraOne system. Ten-mm-long Brånemark implants were placed into a brass block that allowed loading at a 30-degree angle to the long axis. The test group in which the veneer porcelain was fired directly on the all-ceramic abutments was the weakest, and it showed fractures at a mean value of 236 N. The fracture strength of the three other test groups was dependent on the extension of the crown margin relative to the location of the screw head. The test group...
Odontostomatologike proodos, 1990
Necessary restorative requirements for full coverage are adequate axial wall height of the prepar... more Necessary restorative requirements for full coverage are adequate axial wall height of the preparation for retention as well as sufficient vertical width of sound tooth structure cervically for the crown margins. In cases where adequate healthy tooth structure does not exist coronally to the epithelial attachment due to various crown damages, the margins of the crown might traumatize the periodontal attachment and the periodontium will be jeopardized iatrogenically. Teeth with inadequate axial Reight of the clinical crown, subgingival caries, vertical or horizontal fractures will require surgical crown lengthening procedures before prosthetic treatment is performed. These procedures may either involve only the soft tissues or bone remodeling as well. Irrespective of the procedure, crown lengthening must be performed with the objective of at least 3 mm. of healthy tooth structure coronally to the bone. This width will permit the formation of a new dentinogingival junction and the exi...
Quintessence international (Berlin, Germany : 1985), 1994
Crown lengthening has been advocated as a treatment modality to restore teeth with a clinical cro... more Crown lengthening has been advocated as a treatment modality to restore teeth with a clinical crown reduced subsequent to different kinds of trauma. Multirooted teeth, however, present certain anatomic features, such as the furcation area and corresponding interradicular bone, the retromolar area, and the external oblique ridge, that may limit the possibility for soft tissue and bone reduction and minimize the effectiveness of crown-lengthening procedures. This article describes surgical modifications to overcome the anatomic difficulties that multirooted teeth present when crown lengthening is required. Furthermore, root resection is discussed as an alternative to conventional surgery when the latter is not possible.
The International journal of prosthodontics
The purpose of this study was to use three-dimensional finite element analysis to analyze stress ... more The purpose of this study was to use three-dimensional finite element analysis to analyze stress distribution patterns in Re-Implant implants made of commercially pure titanium (cpTi) and yttrium-partially stabilized zirconia (YPSZ). Two three-dimensional finite element analysis models of a maxillary incisor with Re-Implant implants were made, surrounded by cortical and cancellous bone. A porcelain-fused-to-metal crown for the cpTi implant and a ceramic crown for the YPSZ implant were modeled. Stress levels were calculated according to the von Mises criteria. Higher stresses were observed at the area where the implant entered the bone. Stresses were higher at the facial and lingual surfaces than the proximal ones. In cortical bone and at the junction of cortical and cancellous bone, stress distribution presented a pattern of alternating higher (4.0 to 5.0 MPa) and lower (1.3 to 2.0 MPa) stress areas. Higher stresses were found at the apical third of the implant-to-bone junction as w...
The International journal of prosthodontics
All-ceramic restorations can solve many esthetic problems associated with implant-supported prost... more All-ceramic restorations can solve many esthetic problems associated with implant-supported prostheses. This study evaluated stress concentration and distribution in implant abutments under normal masticatory forces using computer simulations. Two-dimensional finite element analysis was used to study four different abutment-restoration combinations using Brånemark implants. The models considered two positions of the fastening screw, two positions of the crown margins, cemented versus screw-retained prostheses, and clinical loads of 200 N. Models having screws on top of abutments had the lowest stresses (3.1 to 4.8 MPa) and best stress distribution. Screw-retained prostheses and short crown margins increased overall stresses (9.9 to 11.4 MPa).
Hellenika stomatologika chronika. Hellenic stomatological annals
The aim of the present study was the evaluation of tissue response under ceramometal pontics that... more The aim of the present study was the evaluation of tissue response under ceramometal pontics that had smooth convex tissue surfaces and were pressing against the soft tissues of the residual ridge while the subjects were applying excellent plaque control. Fixed patial dentures were fabricated full filling the above criteria. Clinical and histologic evaluation followed. The results led to the conclusion that pressure from convex and smooth pontics under the condition of excellent plaque control do not create inflammation, while the pressure is neutralized as the time goes by through modification of the morphology of the soft tissues adjacent to the pontics.
The Journal of Prosthetic Dentistry, 1997
Purpose. The accuracy ofinterocdusal records influences the relationship of the working casts and... more Purpose. The accuracy ofinterocdusal records influences the relationship of the working casts and therefore the success of the prosthesis. The aims of this study were to determine the accuracy of the fit of interocclusal records on the working casts and to compare the accuracy between a classic and modified recording technique, which is described in this article.
The Journal of Prosthetic Dentistry, 1995
Clinical studies have confirmed the adequate reproducibility of both centric occlusion and centri... more Clinical studies have confirmed the adequate reproducibility of both centric occlusion and centric relation when used as reference positions during treatment; however, the reproducibility of the neuromuscular position has been found inadequate. This study evaluated the location and reproducibility of these three mandibular positions in relation to body posture, sitting and supine, and bilateral muscle activity before and after the insertion of a fiat mandibular positioning device equilibrated to balance the muscle functions, as shown by two electromyography biofeedback instruments. Intraoral recordings were made in 11 young subjects with complete natural dentition. Acrylic resin clutches that supported a screw point in the maxillary arch and painted glass in the mandibular arch were used and positioned not to interfere with the occlusion. The distances of the screw scratch from two of the edges of the painted glass were used to measure the anteroposterior and mediolateral locations with a micrometer. The reproducibility was evaluated by measuring the scratch surface by measuring the weight of the print cutouts made from photographs of the scratches taken with a stereoscope. The location and reproducibility of centric occlusion and centric relation were not affected by body posture. A more precise posterior neuromuscular position was obtained in the supine position. The insertion of a mandibular positioning device did not affect centric occlusion but gave a more precise centric relation. Neuromuscular position became as precise as centric occlusion and was located anteroposteriorly between centric occlusion and centric relation. (J PROSTHET DENT 1995;73:190-8.)
The International journal of prosthodontics
The strength and mode of failure of three different designs of custom-made all-ceramic implant ab... more The strength and mode of failure of three different designs of custom-made all-ceramic implant abutments fabricated by milling of In-Ceram sintered ceramic blocks were compared with the conventional CeraOne system under static load. Four test groups were formed with different locations of abutment screws. In three test groups, In-Ceram crowns were fabricated for placement on the all-ceramic abutments, and in one test group, a veneer porcelain was fired directly on the abutment; crowns in the control group were fabricated using the CeraOne system. Ten-mm-long Brånemark implants were placed into a brass block that allowed loading at a 30-degree angle to the long axis. The test group in which the veneer porcelain was fired directly on the all-ceramic abutments was the weakest, and it showed fractures at a mean value of 236 N. The fracture strength of the three other test groups was dependent on the extension of the crown margin relative to the location of the screw head. The test group...
Journal of Osseointegration, 2017
Aim Intraoral welding has been introduced as a means to fabricate a rigid implant-splinting metal... more Aim Intraoral welding has been introduced as a means to fabricate a rigid implant-splinting metal framework supporting immediate implant prostheses. Methods This method can also be applied for the immediate transformation of a removable lower full prosthesis, with inadequate retention and stability, into a fixed implant supported rehabilitation. In this way it was possible to preserve the correct esthetic and occlusal parameters that had been previously established and to which the patient has been accustomed. The prosthesis is modified by removing the denture flanges. The remaining part of the denture teeth, are joined together with the acrylic resin representing the gingiva and forming a bare dental arch composition. After implant placement, the Ti framework is fabricated by initial intraoral welding, followed by extra-oral completion. The denture is then stabilized with acrylic resin onto the framework intraorally. The prosthesis is completed with additional acrylic resin in the ...
The International journal of prosthodontics
The strength and mode of failure of three different designs of custom-made all-ceramic implant ab... more The strength and mode of failure of three different designs of custom-made all-ceramic implant abutments fabricated by milling of In-Ceram sintered ceramic blocks were compared with the conventional CeraOne system under static load. Four test groups were formed with different locations of abutment screws. In three test groups, In-Ceram crowns were fabricated for placement on the all-ceramic abutments, and in one test group, a veneer porcelain was fired directly on the abutment; crowns in the control group were fabricated using the CeraOne system. Ten-mm-long Brånemark implants were placed into a brass block that allowed loading at a 30-degree angle to the long axis. The test group in which the veneer porcelain was fired directly on the all-ceramic abutments was the weakest, and it showed fractures at a mean value of 236 N. The fracture strength of the three other test groups was dependent on the extension of the crown margin relative to the location of the screw head. The test group...
Odontostomatologike proodos, 1990
Necessary restorative requirements for full coverage are adequate axial wall height of the prepar... more Necessary restorative requirements for full coverage are adequate axial wall height of the preparation for retention as well as sufficient vertical width of sound tooth structure cervically for the crown margins. In cases where adequate healthy tooth structure does not exist coronally to the epithelial attachment due to various crown damages, the margins of the crown might traumatize the periodontal attachment and the periodontium will be jeopardized iatrogenically. Teeth with inadequate axial Reight of the clinical crown, subgingival caries, vertical or horizontal fractures will require surgical crown lengthening procedures before prosthetic treatment is performed. These procedures may either involve only the soft tissues or bone remodeling as well. Irrespective of the procedure, crown lengthening must be performed with the objective of at least 3 mm. of healthy tooth structure coronally to the bone. This width will permit the formation of a new dentinogingival junction and the exi...
Quintessence international (Berlin, Germany : 1985), 1994
Crown lengthening has been advocated as a treatment modality to restore teeth with a clinical cro... more Crown lengthening has been advocated as a treatment modality to restore teeth with a clinical crown reduced subsequent to different kinds of trauma. Multirooted teeth, however, present certain anatomic features, such as the furcation area and corresponding interradicular bone, the retromolar area, and the external oblique ridge, that may limit the possibility for soft tissue and bone reduction and minimize the effectiveness of crown-lengthening procedures. This article describes surgical modifications to overcome the anatomic difficulties that multirooted teeth present when crown lengthening is required. Furthermore, root resection is discussed as an alternative to conventional surgery when the latter is not possible.
The International journal of prosthodontics
The purpose of this study was to use three-dimensional finite element analysis to analyze stress ... more The purpose of this study was to use three-dimensional finite element analysis to analyze stress distribution patterns in Re-Implant implants made of commercially pure titanium (cpTi) and yttrium-partially stabilized zirconia (YPSZ). Two three-dimensional finite element analysis models of a maxillary incisor with Re-Implant implants were made, surrounded by cortical and cancellous bone. A porcelain-fused-to-metal crown for the cpTi implant and a ceramic crown for the YPSZ implant were modeled. Stress levels were calculated according to the von Mises criteria. Higher stresses were observed at the area where the implant entered the bone. Stresses were higher at the facial and lingual surfaces than the proximal ones. In cortical bone and at the junction of cortical and cancellous bone, stress distribution presented a pattern of alternating higher (4.0 to 5.0 MPa) and lower (1.3 to 2.0 MPa) stress areas. Higher stresses were found at the apical third of the implant-to-bone junction as w...
The International journal of prosthodontics
All-ceramic restorations can solve many esthetic problems associated with implant-supported prost... more All-ceramic restorations can solve many esthetic problems associated with implant-supported prostheses. This study evaluated stress concentration and distribution in implant abutments under normal masticatory forces using computer simulations. Two-dimensional finite element analysis was used to study four different abutment-restoration combinations using Brånemark implants. The models considered two positions of the fastening screw, two positions of the crown margins, cemented versus screw-retained prostheses, and clinical loads of 200 N. Models having screws on top of abutments had the lowest stresses (3.1 to 4.8 MPa) and best stress distribution. Screw-retained prostheses and short crown margins increased overall stresses (9.9 to 11.4 MPa).
Hellenika stomatologika chronika. Hellenic stomatological annals
The aim of the present study was the evaluation of tissue response under ceramometal pontics that... more The aim of the present study was the evaluation of tissue response under ceramometal pontics that had smooth convex tissue surfaces and were pressing against the soft tissues of the residual ridge while the subjects were applying excellent plaque control. Fixed patial dentures were fabricated full filling the above criteria. Clinical and histologic evaluation followed. The results led to the conclusion that pressure from convex and smooth pontics under the condition of excellent plaque control do not create inflammation, while the pressure is neutralized as the time goes by through modification of the morphology of the soft tissues adjacent to the pontics.
The Journal of Prosthetic Dentistry, 1997
Purpose. The accuracy ofinterocdusal records influences the relationship of the working casts and... more Purpose. The accuracy ofinterocdusal records influences the relationship of the working casts and therefore the success of the prosthesis. The aims of this study were to determine the accuracy of the fit of interocclusal records on the working casts and to compare the accuracy between a classic and modified recording technique, which is described in this article.
The Journal of Prosthetic Dentistry, 1995
Clinical studies have confirmed the adequate reproducibility of both centric occlusion and centri... more Clinical studies have confirmed the adequate reproducibility of both centric occlusion and centric relation when used as reference positions during treatment; however, the reproducibility of the neuromuscular position has been found inadequate. This study evaluated the location and reproducibility of these three mandibular positions in relation to body posture, sitting and supine, and bilateral muscle activity before and after the insertion of a fiat mandibular positioning device equilibrated to balance the muscle functions, as shown by two electromyography biofeedback instruments. Intraoral recordings were made in 11 young subjects with complete natural dentition. Acrylic resin clutches that supported a screw point in the maxillary arch and painted glass in the mandibular arch were used and positioned not to interfere with the occlusion. The distances of the screw scratch from two of the edges of the painted glass were used to measure the anteroposterior and mediolateral locations with a micrometer. The reproducibility was evaluated by measuring the scratch surface by measuring the weight of the print cutouts made from photographs of the scratches taken with a stereoscope. The location and reproducibility of centric occlusion and centric relation were not affected by body posture. A more precise posterior neuromuscular position was obtained in the supine position. The insertion of a mandibular positioning device did not affect centric occlusion but gave a more precise centric relation. Neuromuscular position became as precise as centric occlusion and was located anteroposteriorly between centric occlusion and centric relation. (J PROSTHET DENT 1995;73:190-8.)
The International journal of prosthodontics
The strength and mode of failure of three different designs of custom-made all-ceramic implant ab... more The strength and mode of failure of three different designs of custom-made all-ceramic implant abutments fabricated by milling of In-Ceram sintered ceramic blocks were compared with the conventional CeraOne system under static load. Four test groups were formed with different locations of abutment screws. In three test groups, In-Ceram crowns were fabricated for placement on the all-ceramic abutments, and in one test group, a veneer porcelain was fired directly on the abutment; crowns in the control group were fabricated using the CeraOne system. Ten-mm-long Brånemark implants were placed into a brass block that allowed loading at a 30-degree angle to the long axis. The test group in which the veneer porcelain was fired directly on the all-ceramic abutments was the weakest, and it showed fractures at a mean value of 236 N. The fracture strength of the three other test groups was dependent on the extension of the crown margin relative to the location of the screw head. The test group...