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 European journal of esthetic dentistry : official journal of the European Academy of Esthetic Dentistry, 2009
Advanced ceramic materials such as zirconia have great potential as substitutes for traditional m... more Advanced ceramic materials such as zirconia have great potential as substitutes for traditional materials in many biomedical applications. Since the end of the 1990s, the form of partially stabilized zirconia has been promoted as suitable for dental use due to its excellent strength and superior fracture resistance as result of an inherent transformation toughening mechanism. In addition, zirconia bioceramic presents enhanced biocompatibility, low radioactivity, and interesting optical properties. The introduction of computer-aided design/computer-aided manufacturing (CAD/CAM) techniques has increased the general acceptance of zirconia in dentistry. However, some fabrication procedures such as grinding, polishing, sandblasting, heat treatment, and veneering of the fine-grained metastable zirconia microstructures may affect the long-term stability and success of the material by influencing its aging sensitivity. The purpose of this review is to address the evolution of zirconia as a ...
Quintessence international (Berlin, Germany : 1985), 2008
Endosseous implants present high survival rates within a 10-year observation time; however, impla... more Endosseous implants present high survival rates within a 10-year observation time; however, implant failure and biologic complications are not completely avoidable. Although specific bacteria, dental plaque, and environmental factors are associated with peri-implant disease, there are currently no reliable predictors of peri-implantitis occurrence and severity. Disagreement about which clinical measures of peri-implant health are of diagnostic value continues because of the complexity of the disease process. Thus, identification of genes that control or modify aspects of the host response may provide a method to identify individuals at an elevated risk for peri-implant infections. Elevated levels of the inflammatory cytokine interleukin-1 (IL-1) in the crevicular fluid around diseased implants seem to play an important role in the pathogenesis and severity of peri-implantitis. The purpose of this review article was to critically address the genetic associations regarding IL-1 genoty...
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...
The ultimate goal in modern esthetic dentistry is the restoration of lost hard and soft tissues b... more The ultimate goal in modern esthetic dentistry is the restoration of lost hard and soft tissues by imitating nature as closely as possible. With the increasing esthetic awareness of patients, surgical and technical developments, and dentists' enhanced skills and knowledge, optimal function and esthetics are achievable even with implant-supported restorations in molar regions. Anatomic and morphologic factors and poor bone quantity and quality might reduce success rates of dental implants in the posterior jaw. Today, there are two options to replace a single missing molar by an implant-supported crown: the single wide-diameter implant or two standard-diameter implants. These two approaches are described and their advantages and disadvantages discussed in two exemplary clinical cases. In one case, the edentulous ridge in the area of the mandibular right first molar (FDI tooth 46) provided sufficient mesiodistal space to restore tooth 46 with a porcelain-fused-to-metal crown on two...
The purpose of this study was to determine the effect of frequent recall appointments for a profe... more The purpose of this study was to determine the effect of frequent recall appointments for a professional oral prophylaxis, specificaly for patients with fixed prostheses. By a dental hygienist the prophylaxis was repeated every month for a test group and twice a year for a control group (24 subjects). All patients were reexamined at 6- and 12-month intervals to reevaluate the oral health. This study demonstrated that careful professional cleaning of the teeth of patiens with fixed prostheses once every month is sufficient to maintain satisfactory oral hygiene. For the private practitioner it hardly seems realistic to organize a recall program once every month. However, professional clearning twice a year cannot guarantee oral health in all patients with fixed prostheses. Therefore further examinations over a longer period of time are necessary to determine reasonable recall intervals for the successful establishment and maintenance of oral health.
Schweizer Monatsschrift für Zahnmedizin = Revue mensuelle suisse d'odonto-stomatologie = Rivista mensile svizzera di odontologia e stomatologia / SSO, 2006
VITA In-Ceram Classic is a system to fabricate all-ceramic crowns and fixed partial dentures (FPD... more VITA In-Ceram Classic is a system to fabricate all-ceramic crowns and fixed partial dentures (FPDs) with a glass-infiltrated aluminium oxide core material. This systematic review gives an overview of the clinical performance of the In-Ceram Classic types Alumina, Spinell and Zirconia. Based on a systematic literature research, an evidence-based selection and assessment of clinical studies of In-Ceram Classic ceramics was carried out. A total of 294 publications were found, 21 of which conformed to the inclusion criteria. Only few meaningful studies of In-Ceram Alumina FPDs and In-Ceram Zirconia crowns and FPDs were found. The Five-year survival rate of In-Ceram Alumina crowns and In-Ceram Spinell crowns ranging from 91.7% to 100% is similar to the survival rate of conventional metal-ceramic crowns. The Five-year survival rate of single-retainer In-Ceram Alumina resin-bonded fixed partial dentures (RBFPDs) was 92.3%, and thus higher than that of two-retainer RBFPDs. In-Ceram Classic ...
Objectives: A novel tapered, variable-thread design implant (NobelActive) has been developed. It ... more Objectives: A novel tapered, variable-thread design implant (NobelActive) has been developed. It is designed to provide stable tissue support and immediate function. As for all newly developed implant systems, documentation of treatment success, marginal bone levels and soft tissue conditions over time are needed. The objective of this multi-centre study was to evaluate the bone and soft tissue remodeling around NobelActive implants in immediate function. Methods: Sixty-four partially or fully edentulous patients received 117 NobelActive implants, as part of a prospective randomized controlled study in 12 centres. All implants were placed into healed sites. Temporary prostheses were placed within 24 hours after surgery. Definitive prostheses were placed within the first year. Clinical and radiographic examinations were performed at implant placement and after 3, 6, 12 and 24 months. Results: 5 implant failures, in 5 patients, occurred during the first two years resulting in a cumula...
Three-uni t fixed partial dentures (FPDs), single implant-supported crown restorations and resin-... more Three-uni t fixed partial dentures (FPDs), single implant-supported crown restorations and resin-bonded fixed partial dentures are the treatment modalities recommended for the replacement of a missing incisor. 1 All-ceramic, resin-bonded fixed partial dentures (RBFPDs) made of glass-infiltrated aluminum-oxide ceramic material (In-Ceram, Vita, Bad Sackingen, Germany) were first introduced using a slip-casting technique. The fabrication and the clinical application were based on clinical experience with conventional resinbonded prostheses, 3,4 the improved strength of the aluminum-oxide ceramic framework, 5 and the rapid advances of bonding to tooth substance 6 and alumina ceramic material. 7 Several patient reports concerning the replacement of either avulsed primary, 8 congenitally missing teeth, or permanent missing incisors 12 were published, confirming a continuous clinical interest in all-ceramic RBFPDs.
The purpose of this study was to evaluate the fracture strength of four different types of anteri... more The purpose of this study was to evaluate the fracture strength of four different types of anterior 3-unit bridges after thermo-mechanical fatigue in a dual-axis chewing simulator. Sixty-four human maxillary incisors were prepared and 32 bridges fabricated. The four groups of eight bridges each were ± (GC): AGC Ò galvano-ceramic bridges (CA): Celay Ò In-Ceram Ò Alumina bridges (E2): heatpressed lithium disilicate glass-ceramic bridges and (CM) ceramo-metal (control). Fracture loads were recorded after a dual-axis chewing simulator and in a universal testing machine. The survival rate after 5 years for the CM and the GC groups was 100%, for the E2 group 75% and for the CA group 37á5% (Kaplan±Mayer analysis). The mean fracture strengths (N) were 681á52 151á90 (CM); 397á71 59á02 (GC); 292á92 46á45 (E2) and 239á95 33á39 (CA), respectively. The log±rank test showed a signi®cant difference between the CA and the GC or the CA and the CM groups. No signi®cant differences between the E2 and the CA or the E2 and the GC groups were found. The study indicates that heat-pressed lithium disilicate glass-ceramic and AGC Ò galvano-ceramic bridges are alternatives to ceramo-metal 3-unit anterior bridges.
Twenty all-porcelain In-Ceram bridges were resin bonded to natural teeth on a study model. Ten of... more Twenty all-porcelain In-Ceram bridges were resin bonded to natural teeth on a study model. Ten of the test specimens were fixed on abutments placed directly in resin. and 10 were supported by an artificial periodontal membrane. Incisal forces of physiological magnitude and direction were applied in three bridges of both groups (test samples) in an artificial oral environment (1250000 cycles). The fracture strength ofthe six test and 14 control specimens was tested in a universal testing instrument and the rupture strength measured. There was no significant difference between the fracture strength of the test and control samples. The artificial periodontal membrane around the abutment teeth did not reduce the fracture strength of the In-Ceram bridges.
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 European journal of esthetic dentistry : official journal of the European Academy of Esthetic Dentistry, 2009
Advanced ceramic materials such as zirconia have great potential as substitutes for traditional m... more Advanced ceramic materials such as zirconia have great potential as substitutes for traditional materials in many biomedical applications. Since the end of the 1990s, the form of partially stabilized zirconia has been promoted as suitable for dental use due to its excellent strength and superior fracture resistance as result of an inherent transformation toughening mechanism. In addition, zirconia bioceramic presents enhanced biocompatibility, low radioactivity, and interesting optical properties. The introduction of computer-aided design/computer-aided manufacturing (CAD/CAM) techniques has increased the general acceptance of zirconia in dentistry. However, some fabrication procedures such as grinding, polishing, sandblasting, heat treatment, and veneering of the fine-grained metastable zirconia microstructures may affect the long-term stability and success of the material by influencing its aging sensitivity. The purpose of this review is to address the evolution of zirconia as a ...
Quintessence international (Berlin, Germany : 1985), 2008
Endosseous implants present high survival rates within a 10-year observation time; however, impla... more Endosseous implants present high survival rates within a 10-year observation time; however, implant failure and biologic complications are not completely avoidable. Although specific bacteria, dental plaque, and environmental factors are associated with peri-implant disease, there are currently no reliable predictors of peri-implantitis occurrence and severity. Disagreement about which clinical measures of peri-implant health are of diagnostic value continues because of the complexity of the disease process. Thus, identification of genes that control or modify aspects of the host response may provide a method to identify individuals at an elevated risk for peri-implant infections. Elevated levels of the inflammatory cytokine interleukin-1 (IL-1) in the crevicular fluid around diseased implants seem to play an important role in the pathogenesis and severity of peri-implantitis. The purpose of this review article was to critically address the genetic associations regarding IL-1 genoty...
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...
The ultimate goal in modern esthetic dentistry is the restoration of lost hard and soft tissues b... more The ultimate goal in modern esthetic dentistry is the restoration of lost hard and soft tissues by imitating nature as closely as possible. With the increasing esthetic awareness of patients, surgical and technical developments, and dentists' enhanced skills and knowledge, optimal function and esthetics are achievable even with implant-supported restorations in molar regions. Anatomic and morphologic factors and poor bone quantity and quality might reduce success rates of dental implants in the posterior jaw. Today, there are two options to replace a single missing molar by an implant-supported crown: the single wide-diameter implant or two standard-diameter implants. These two approaches are described and their advantages and disadvantages discussed in two exemplary clinical cases. In one case, the edentulous ridge in the area of the mandibular right first molar (FDI tooth 46) provided sufficient mesiodistal space to restore tooth 46 with a porcelain-fused-to-metal crown on two...
The purpose of this study was to determine the effect of frequent recall appointments for a profe... more The purpose of this study was to determine the effect of frequent recall appointments for a professional oral prophylaxis, specificaly for patients with fixed prostheses. By a dental hygienist the prophylaxis was repeated every month for a test group and twice a year for a control group (24 subjects). All patients were reexamined at 6- and 12-month intervals to reevaluate the oral health. This study demonstrated that careful professional cleaning of the teeth of patiens with fixed prostheses once every month is sufficient to maintain satisfactory oral hygiene. For the private practitioner it hardly seems realistic to organize a recall program once every month. However, professional clearning twice a year cannot guarantee oral health in all patients with fixed prostheses. Therefore further examinations over a longer period of time are necessary to determine reasonable recall intervals for the successful establishment and maintenance of oral health.
Schweizer Monatsschrift für Zahnmedizin = Revue mensuelle suisse d'odonto-stomatologie = Rivista mensile svizzera di odontologia e stomatologia / SSO, 2006
VITA In-Ceram Classic is a system to fabricate all-ceramic crowns and fixed partial dentures (FPD... more VITA In-Ceram Classic is a system to fabricate all-ceramic crowns and fixed partial dentures (FPDs) with a glass-infiltrated aluminium oxide core material. This systematic review gives an overview of the clinical performance of the In-Ceram Classic types Alumina, Spinell and Zirconia. Based on a systematic literature research, an evidence-based selection and assessment of clinical studies of In-Ceram Classic ceramics was carried out. A total of 294 publications were found, 21 of which conformed to the inclusion criteria. Only few meaningful studies of In-Ceram Alumina FPDs and In-Ceram Zirconia crowns and FPDs were found. The Five-year survival rate of In-Ceram Alumina crowns and In-Ceram Spinell crowns ranging from 91.7% to 100% is similar to the survival rate of conventional metal-ceramic crowns. The Five-year survival rate of single-retainer In-Ceram Alumina resin-bonded fixed partial dentures (RBFPDs) was 92.3%, and thus higher than that of two-retainer RBFPDs. In-Ceram Classic ...
Objectives: A novel tapered, variable-thread design implant (NobelActive) has been developed. It ... more Objectives: A novel tapered, variable-thread design implant (NobelActive) has been developed. It is designed to provide stable tissue support and immediate function. As for all newly developed implant systems, documentation of treatment success, marginal bone levels and soft tissue conditions over time are needed. The objective of this multi-centre study was to evaluate the bone and soft tissue remodeling around NobelActive implants in immediate function. Methods: Sixty-four partially or fully edentulous patients received 117 NobelActive implants, as part of a prospective randomized controlled study in 12 centres. All implants were placed into healed sites. Temporary prostheses were placed within 24 hours after surgery. Definitive prostheses were placed within the first year. Clinical and radiographic examinations were performed at implant placement and after 3, 6, 12 and 24 months. Results: 5 implant failures, in 5 patients, occurred during the first two years resulting in a cumula...
Three-uni t fixed partial dentures (FPDs), single implant-supported crown restorations and resin-... more Three-uni t fixed partial dentures (FPDs), single implant-supported crown restorations and resin-bonded fixed partial dentures are the treatment modalities recommended for the replacement of a missing incisor. 1 All-ceramic, resin-bonded fixed partial dentures (RBFPDs) made of glass-infiltrated aluminum-oxide ceramic material (In-Ceram, Vita, Bad Sackingen, Germany) were first introduced using a slip-casting technique. The fabrication and the clinical application were based on clinical experience with conventional resinbonded prostheses, 3,4 the improved strength of the aluminum-oxide ceramic framework, 5 and the rapid advances of bonding to tooth substance 6 and alumina ceramic material. 7 Several patient reports concerning the replacement of either avulsed primary, 8 congenitally missing teeth, or permanent missing incisors 12 were published, confirming a continuous clinical interest in all-ceramic RBFPDs.
The purpose of this study was to evaluate the fracture strength of four different types of anteri... more The purpose of this study was to evaluate the fracture strength of four different types of anterior 3-unit bridges after thermo-mechanical fatigue in a dual-axis chewing simulator. Sixty-four human maxillary incisors were prepared and 32 bridges fabricated. The four groups of eight bridges each were ± (GC): AGC Ò galvano-ceramic bridges (CA): Celay Ò In-Ceram Ò Alumina bridges (E2): heatpressed lithium disilicate glass-ceramic bridges and (CM) ceramo-metal (control). Fracture loads were recorded after a dual-axis chewing simulator and in a universal testing machine. The survival rate after 5 years for the CM and the GC groups was 100%, for the E2 group 75% and for the CA group 37á5% (Kaplan±Mayer analysis). The mean fracture strengths (N) were 681á52 151á90 (CM); 397á71 59á02 (GC); 292á92 46á45 (E2) and 239á95 33á39 (CA), respectively. The log±rank test showed a signi®cant difference between the CA and the GC or the CA and the CM groups. No signi®cant differences between the E2 and the CA or the E2 and the GC groups were found. The study indicates that heat-pressed lithium disilicate glass-ceramic and AGC Ò galvano-ceramic bridges are alternatives to ceramo-metal 3-unit anterior bridges.
Twenty all-porcelain In-Ceram bridges were resin bonded to natural teeth on a study model. Ten of... more Twenty all-porcelain In-Ceram bridges were resin bonded to natural teeth on a study model. Ten of the test specimens were fixed on abutments placed directly in resin. and 10 were supported by an artificial periodontal membrane. Incisal forces of physiological magnitude and direction were applied in three bridges of both groups (test samples) in an artificial oral environment (1250000 cycles). The fracture strength ofthe six test and 14 control specimens was tested in a universal testing instrument and the rupture strength measured. There was no significant difference between the fracture strength of the test and control samples. The artificial periodontal membrane around the abutment teeth did not reduce the fracture strength of the In-Ceram bridges.
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