Bernard Cannas - Academia.edu (original) (raw)

Papers by Bernard Cannas

Research paper thumbnail of Ostéotomie de Schuchardt : intérêt dans la chirurgie préprothétique et préimplantaire

Research paper thumbnail of A retrospective cohort study of 113 patients rehabilitated with immediately loaded maxillary cross-arch fixed dental prostheses in combination with immediate implant placement

European Journal of Oral Implantology, 2012

Purpose: To retrospectively evaluate the outcome of immediately loaded cross-arch fixed dental pr... more Purpose: To retrospectively evaluate the outcome of immediately loaded cross-arch fixed dental prostheses 6 months after loading. A second aim was to compare survival rates of implants placed in healed versus fresh extraction sites. Materials and methods: In total, 113 consecutive patients about to have their maxillae rendered fully edentulous (mean extractions per patient: 6.7 teeth) received four to eight implants each (total number = 675) which were immediately placed in healed sites (323 implants, 47.9%) or fresh sockets (352 implants, 52.1%). Immediate loading of provisional prostheses was performed and all patients were followed up for 6 months. The success criteria included prosthesis success, assessment of individual implant stability and complications. Results: No patients dropped out and all 113 patients received definitive fixed prostheses after 6 months of loading. The overall implant survival rate after 6 months was 99.1%. Six implants were lost in 6 patients (5.3%). Five of them were inserted in fresh extraction sockets (1.4%) and one in a healed site (0.3%). No significant difference (P = 0.1621) was found for implants placed in healed sites versus fresh extraction sites. Ten patients had fractures of the provisional prostheses as complications. Conclusions: Immediate implant placement and loading resulted in high implant as well as prosthetic survival rates. Placement in healed or fresh extraction bone sites may not influence implant survival.

Research paper thumbnail of A retrospective cohort study of 113 patients rehabilitated with immediately loaded maxillary cross-arch fixed dental prostheses in combination with immediate implant placement

European journal of oral implantology, 2012

To retrospectively evaluate the outcome of immediately loaded cross-arch fixed dental prostheses ... more To retrospectively evaluate the outcome of immediately loaded cross-arch fixed dental prostheses 6 months after loading. A second aim was to compare survival rates of implants placed in healed versus fresh extraction sites. In total, 113 consecutive patients about to have their maxillae rendered fully edentulous (mean extractions per patient: 6.7 teeth) received four to eight implants each (total number = 675) which were immediately placed in healed sites (323 implants, 47.9%) or fresh sockets (352 implants, 52.1%). Immediate loading of provisional prostheses was performed and all patients were followed up for 6 months. The success criteria included prosthesis success, assessment of individual implant stability and complications. No patients dropped out and all 113 patients received definitive fixed prostheses after 6 months of loading. The overall implant survival rate after 6 months was 99.1%. Six implants were lost in 6 patients (5.3%). Five of them were inserted in fresh extract...

Research paper thumbnail of A retrospective cohort study of 105 patients rehabilitated with immediately loaded mandibular cross-arch bridges in combination with immediate implant placement

European journal of oral implantology, 2011

To evaluate the outcome of immediately loaded cross-arch bridges 4 months after loading. A second... more To evaluate the outcome of immediately loaded cross-arch bridges 4 months after loading. A second aim was to compare survival rates of implants placed in healed versus fresh extraction sites. In total, 105 consecutive patients about to have their mandibles rendered fully edentulous (mean extractions per patient: 6.1 teeth) received four to six implants each (total number = 448), which were immediately placed in healed sites (266 implants, 59%) or fresh sockets (182 implants: 41%). Immediate loading of provisional prostheses was performed and all patients were followed-up for 4 months. The success criteria included prosthesis success, assessment of individual implant stability and complications. No patient dropped out and all 105 patients received definitive fixed prostheses after four months of loading. The overall implant survival rate after four months was 98.2%. Eight implants were lost in eight patients (8%). Four of them were inserted in fresh extraction sockets (2.2%) and four...

Research paper thumbnail of Accuracy of Guided Surgical Template Implant Surgery on Human Cadavers

Objectives: The objective of this study was to compare the deviation between the position of virt... more Objectives: The objective of this study was to compare the deviation between the position of virtually planned implants and the position of implants placed with a CAD/CAM-guided surgical template in the mandible and the maxilla in human cadavers. Methods: The use of the human-derived materials was approved by the Laboratory of Anatomy department, University of Paris Descartes according to the regulations in France. Ten maxillae and 7 mandibles from cadavers were scanned with CT, and 145 implants (Brnemark RP Groovy) were planned with software and placed with the aid of a CAD/CAM-guided surgical template. The preoperative CT scan was matched with the postoperative CT scan using voxel-based registration. Measurements were calculated in software. The positions of the virtually planned implants were compared with the actual positions of the implants. Data were analyzed with a t test (α=.05). Results: The mean measurement differences between the computer-planned implants and implants pla...

Research paper thumbnail of Virtual variation simulation of CAD/CAM template-guided surgeries performed on human cadavers: Part II

The Journal of Prosthetic Dentistry, 2010

Research paper thumbnail of Guided Surgery and Presurgical Prosthesis: Preliminary Results of 33 Fully Edentulous Maxillae Treated in Accordance with the NobelGuide® Protocol

Clinical Implant Dentistry and Related Research, 2008

Objective: The aim of this study was to present the preliminary results of 33 edentulous maxillar... more Objective: The aim of this study was to present the preliminary results of 33 edentulous maxillary patients treated using the Nobelguide® (Nobel Biocare AB, Göteborg, Sweden) technique. Materials and Methods: Thirty-three patients were treated according to the conventional protocol of the Nobelguide® technique in two clinical centers. This group of patients received 211 implants. Monitoring was carried out for over 12-51 months, depending on the patient. The Nobelguide® protocol was used for all patients. Results: Of the 211 implants loaded, four were lost (1.9%). The implant survival rate was therefore 98.1%. The prosthetic survival rate was 100%. There were some per-operative complications (four) and some postoperative complications (10 fractures of resin). Conclusion: These preliminary results seemed rather promising. These were the first cases of experienced surgeons who needed to learn a new implant placement protocol. It was clear that analysis and understanding of the system were essential in order to obtain such a success. Only one implant was replaced without there being any impact on the prosthesis survival rate which is 100%.

Research paper thumbnail of Accuracy of CAD/CAM-guided surgical template implant surgery on human cadavers: Part I

The Journal of Prosthetic Dentistry, 2010

Research paper thumbnail of Accuracy of virtually planned and conventionally placed implants in edentulous cadaver maxillae and mandibles: a preliminary report

The Journal of prosthetic dentistry, 2014

The accuracy of mental navigation is thought to depend on the clinician's spatial ability. Me... more The accuracy of mental navigation is thought to depend on the clinician's spatial ability. Mental navigation, therefore, is associated with deviations between the mental plan and the definitive implant position. To learn more about the deviation that might occur, it is important to evaluate the accuracy of mental navigation during placement of implants. The purpose of the study was to compare accuracy outcomes between virtually planned and conventionally placed implants, and among surgeons with varying experience. Five completely edentulous sets of maxillae and mandibles from human cadaver heads were scanned by computed tomography. Five surgeons planned and placed 60 implants into these jaws, and accuracy was analyzed for 4 parameters: coronal and apical positions, angulation, and depth. The preoperative and postoperative computed tomographies were aligned in voxel-based registration software, which allowed comparison between virtually planned implant positions and actual implan...

Research paper thumbnail of Ostéotomie de Schuchardt : intérêt dans la chirurgie préprothétique et préimplantaire

Research paper thumbnail of A retrospective cohort study of 113 patients rehabilitated with immediately loaded maxillary cross-arch fixed dental prostheses in combination with immediate implant placement

European Journal of Oral Implantology, 2012

Purpose: To retrospectively evaluate the outcome of immediately loaded cross-arch fixed dental pr... more Purpose: To retrospectively evaluate the outcome of immediately loaded cross-arch fixed dental prostheses 6 months after loading. A second aim was to compare survival rates of implants placed in healed versus fresh extraction sites. Materials and methods: In total, 113 consecutive patients about to have their maxillae rendered fully edentulous (mean extractions per patient: 6.7 teeth) received four to eight implants each (total number = 675) which were immediately placed in healed sites (323 implants, 47.9%) or fresh sockets (352 implants, 52.1%). Immediate loading of provisional prostheses was performed and all patients were followed up for 6 months. The success criteria included prosthesis success, assessment of individual implant stability and complications. Results: No patients dropped out and all 113 patients received definitive fixed prostheses after 6 months of loading. The overall implant survival rate after 6 months was 99.1%. Six implants were lost in 6 patients (5.3%). Five of them were inserted in fresh extraction sockets (1.4%) and one in a healed site (0.3%). No significant difference (P = 0.1621) was found for implants placed in healed sites versus fresh extraction sites. Ten patients had fractures of the provisional prostheses as complications. Conclusions: Immediate implant placement and loading resulted in high implant as well as prosthetic survival rates. Placement in healed or fresh extraction bone sites may not influence implant survival.

Research paper thumbnail of A retrospective cohort study of 113 patients rehabilitated with immediately loaded maxillary cross-arch fixed dental prostheses in combination with immediate implant placement

European journal of oral implantology, 2012

To retrospectively evaluate the outcome of immediately loaded cross-arch fixed dental prostheses ... more To retrospectively evaluate the outcome of immediately loaded cross-arch fixed dental prostheses 6 months after loading. A second aim was to compare survival rates of implants placed in healed versus fresh extraction sites. In total, 113 consecutive patients about to have their maxillae rendered fully edentulous (mean extractions per patient: 6.7 teeth) received four to eight implants each (total number = 675) which were immediately placed in healed sites (323 implants, 47.9%) or fresh sockets (352 implants, 52.1%). Immediate loading of provisional prostheses was performed and all patients were followed up for 6 months. The success criteria included prosthesis success, assessment of individual implant stability and complications. No patients dropped out and all 113 patients received definitive fixed prostheses after 6 months of loading. The overall implant survival rate after 6 months was 99.1%. Six implants were lost in 6 patients (5.3%). Five of them were inserted in fresh extract...

Research paper thumbnail of A retrospective cohort study of 105 patients rehabilitated with immediately loaded mandibular cross-arch bridges in combination with immediate implant placement

European journal of oral implantology, 2011

To evaluate the outcome of immediately loaded cross-arch bridges 4 months after loading. A second... more To evaluate the outcome of immediately loaded cross-arch bridges 4 months after loading. A second aim was to compare survival rates of implants placed in healed versus fresh extraction sites. In total, 105 consecutive patients about to have their mandibles rendered fully edentulous (mean extractions per patient: 6.1 teeth) received four to six implants each (total number = 448), which were immediately placed in healed sites (266 implants, 59%) or fresh sockets (182 implants: 41%). Immediate loading of provisional prostheses was performed and all patients were followed-up for 4 months. The success criteria included prosthesis success, assessment of individual implant stability and complications. No patient dropped out and all 105 patients received definitive fixed prostheses after four months of loading. The overall implant survival rate after four months was 98.2%. Eight implants were lost in eight patients (8%). Four of them were inserted in fresh extraction sockets (2.2%) and four...

Research paper thumbnail of Accuracy of Guided Surgical Template Implant Surgery on Human Cadavers

Objectives: The objective of this study was to compare the deviation between the position of virt... more Objectives: The objective of this study was to compare the deviation between the position of virtually planned implants and the position of implants placed with a CAD/CAM-guided surgical template in the mandible and the maxilla in human cadavers. Methods: The use of the human-derived materials was approved by the Laboratory of Anatomy department, University of Paris Descartes according to the regulations in France. Ten maxillae and 7 mandibles from cadavers were scanned with CT, and 145 implants (Brnemark RP Groovy) were planned with software and placed with the aid of a CAD/CAM-guided surgical template. The preoperative CT scan was matched with the postoperative CT scan using voxel-based registration. Measurements were calculated in software. The positions of the virtually planned implants were compared with the actual positions of the implants. Data were analyzed with a t test (α=.05). Results: The mean measurement differences between the computer-planned implants and implants pla...

Research paper thumbnail of Virtual variation simulation of CAD/CAM template-guided surgeries performed on human cadavers: Part II

The Journal of Prosthetic Dentistry, 2010

Research paper thumbnail of Guided Surgery and Presurgical Prosthesis: Preliminary Results of 33 Fully Edentulous Maxillae Treated in Accordance with the NobelGuide® Protocol

Clinical Implant Dentistry and Related Research, 2008

Objective: The aim of this study was to present the preliminary results of 33 edentulous maxillar... more Objective: The aim of this study was to present the preliminary results of 33 edentulous maxillary patients treated using the Nobelguide® (Nobel Biocare AB, Göteborg, Sweden) technique. Materials and Methods: Thirty-three patients were treated according to the conventional protocol of the Nobelguide® technique in two clinical centers. This group of patients received 211 implants. Monitoring was carried out for over 12-51 months, depending on the patient. The Nobelguide® protocol was used for all patients. Results: Of the 211 implants loaded, four were lost (1.9%). The implant survival rate was therefore 98.1%. The prosthetic survival rate was 100%. There were some per-operative complications (four) and some postoperative complications (10 fractures of resin). Conclusion: These preliminary results seemed rather promising. These were the first cases of experienced surgeons who needed to learn a new implant placement protocol. It was clear that analysis and understanding of the system were essential in order to obtain such a success. Only one implant was replaced without there being any impact on the prosthesis survival rate which is 100%.

Research paper thumbnail of Accuracy of CAD/CAM-guided surgical template implant surgery on human cadavers: Part I

The Journal of Prosthetic Dentistry, 2010

Research paper thumbnail of Accuracy of virtually planned and conventionally placed implants in edentulous cadaver maxillae and mandibles: a preliminary report

The Journal of prosthetic dentistry, 2014

The accuracy of mental navigation is thought to depend on the clinician's spatial ability. Me... more The accuracy of mental navigation is thought to depend on the clinician's spatial ability. Mental navigation, therefore, is associated with deviations between the mental plan and the definitive implant position. To learn more about the deviation that might occur, it is important to evaluate the accuracy of mental navigation during placement of implants. The purpose of the study was to compare accuracy outcomes between virtually planned and conventionally placed implants, and among surgeons with varying experience. Five completely edentulous sets of maxillae and mandibles from human cadaver heads were scanned by computed tomography. Five surgeons planned and placed 60 implants into these jaws, and accuracy was analyzed for 4 parameters: coronal and apical positions, angulation, and depth. The preoperative and postoperative computed tomographies were aligned in voxel-based registration software, which allowed comparison between virtually planned implant positions and actual implan...