This study evaluated the influence of a retentive shoulder design to prevent early failure of thr... more This study evaluated the influence of a retentive shoulder design to prevent early failure of three resin composite build-ups on molars. Ninety-six intact extracted human maxillary third molars were assigned to two groups (n=48) based on occlusal, buccal cusps only and all cusps reduction. The groups were divided into two subgroups: pin retained and non-pin retained build-ups resulting in four groups (n=24), according the cusps reduction: pin retained/partial, pin retained/complete, non-pin retained/partial, non-pin retained/complete. Occlusal reduction was 3 mm with a semi-lunar retentive shoulder of 3 mm and an axial wall height of 1.5 mm. Groups were restored using a microhybrid, flowable or titanium reinforced resin composite. Modified self-curing acrylic resin provisional crowns were fabricated, cemented with non-eugenol temporary cement and thermal cycled. An instron machine applied tension to the provisional crowns parallel to the long axis of the tooth until dislodgement. A ...
Quintessence international (Berlin, Germany : 1985), 2001
The purpose of this study was to evaluate and compare the resistance to crack propagation, as mea... more The purpose of this study was to evaluate and compare the resistance to crack propagation, as measured by the fracture toughness, of some packable posterior resin composites with other posterior resin composite materials. Fracture toughness determinations were made for the 5 packable and the other posterior resin composites using 3-point flexure of beams with a standardized central single-edge notch. Ten beams of each material were tested on an Instron test machine. The maximum loads were determined, from which the fracture toughness values (KIC) were calculated. The data were analyzed statistically using ANOVA and t tests. The resin composites tested demonstrated a range of KIC values. The materials were separated according to the mean KIC values into 5 groups that were statistically different. While 2 packable resin composites had KIC values that were among the highest, the other packables were substantially lower than nonpackables. The intermediate value group consisted of 3 of t...
Quintessence international (Berlin, Germany : 1985), 1998
This article describes a build-up technique that uses a customized acrylic resin shell for restor... more This article describes a build-up technique that uses a customized acrylic resin shell for restoring endodontically treated molars that are involved in three-unit fixed partial denture design. The shell confines the amalgam without impinging on the periodontium to ensure a proper core foundation, an ideal tooth preparation, and a more predictable final restoration.
Quintessence international (Berlin, Germany : 1985), 1995
This article describes a technique for fabricating a custom acrylic resin shell that will ensure ... more This article describes a technique for fabricating a custom acrylic resin shell that will ensure a properly designed amalgam core for the coronally debilitated, endodontically treated posterior tooth. A few simple procedures result in a core foundation for root protection, an ideal crown preparation, and a more predictable final restoration.
Flowable composite is used in a variety of clinical applications; however, the capacity of these ... more Flowable composite is used in a variety of clinical applications; however, the capacity of these materials to resist crack propagation is not well understood. The purpose of this investigation was to compare the resistance to crack propagation of 9 flowable composites as measured by the fracture toughness. The composites studied include AeliteFlo, Crystal Essence, Flow-it, FloRestore, Permaflo, Revolution, Tetric Flow, VersaFlo, and Wave. Ten specimens of each composite were formed with a brass mold with a 3-mm preformed notch. The final dimensions of each specimen were 2 x 4.2 x 20 mm. All specimens were light-polymerized to manufacturer specifications and stored in air for 24 hours. The fracture toughness value, K(IC) (MNm(-3/2)), for each specimen was measured by use of a 3-point bending mode and a single-edge notched beam at a crosshead speed of 0.125 mm/min until fracture. The data were analyzed statistically by use of 1-way analysis of variance, t tests (P<.05), and regression analysis. The flowable composites tested showed a spectrum of fracture toughness values ranging from 1.15 +/- 0.10 MNm(-3/2) for Wave to 1.65 +/- 0.13 MNm(-3/2) for Permaflo (significantly different, P<.05). The remaining materials formed 1 group with intermediate K(IC) values not different from each other (P>.05) but significantly different from Wave and Permaflo. Comparisons of fracture toughness to the filler content by volume of each composite revealed no correlation. This in vitro study concluded that there was no significant difference among 7 of the 9 composites tested in their resistance to fracture. Permaflo showed the greatest resistance to crack propagation. There was no correlation between the filler content by volume and the fracture toughness of these flowable composites.
The Eating Disorders (EDs) are severe and at the times fatal psychosomatic illnesses in which peo... more The Eating Disorders (EDs) are severe and at the times fatal psychosomatic illnesses in which people experience severe disturbances in their eating behavior and related thoughts and emotions. Dental professional are often the first health care providers to recognize signs of any EDs due to the various oral complications that are associated with the condition. Since undiagnosed EDs avoid medical treatment, the role of dental professionals is very crucial to detect the bio-psycho-social disease in the early phase and to provide proper multidisciplinary treatment and recovery. Each eating disorder is unique, and the corresponding treatment varies depending on the degree of severity of the illness and the extent of psychiatric involvement. This article describes the review of two main EDs, anorexia nervosa and bulimia nervosa; and prosthodontic management to rehabilitate patient’s stomatognathic system with these EDs. In this particular case, a bulimic patient who had generalized erosio...
Objectives: The purpose ot this study was to evaluate and compare the resistance to orack propaga... more Objectives: The purpose ot this study was to evaluate and compare the resistance to orack propagation, as measured by the fracture toughness, of some packabie posterior resin composites with other posterior resin composite materiais. Mettiod and materials: Fracture toughness determinations were made for the 5 pacioble and the other posterior resih composites using 3-point fiexure of beams with a standardized oentrai sihgie-edge notch. Ten beams ot each materiai were tested on an Ihstron test machine. The maximum loads were determined, from which the fracture toughness vaiues (K.^) were caicuiated. The data were analyzed statisticaily using ANOVA and à tests. Results: The resin composites tested demonstrated a range of K.^ values. The matenals were separated according to the mean K^-vaiues into 5 groups thaf were statistically different. While 2 packabie resin composites had K.^ values ttiat were among fhe highest, the other paci<abies were substantially lower than nonpackables. The intermediate vaiue group consisted of 3 ot the conventional posterior resin oomposites. Conclusion: There was a very weai< correiafion between fracture fougfiness and reported volume concenfration of particulate reinforcing elements. The posterior resin composites tested exhibited a spectrum of K^. vaiues. The packable resin composites were distributed aiong this spectrum, wifh 2 products exhibiting high potential for resisfance to cracl< propagation. (Quintessence Int 2001:32:206-210) CLiNICAL RELEVANCE: This study determined a range of fracture toughness parameters lor the posterior resin oomposites oonsidered. Restorative materiais with higher K|g values have the potenfiai to withstand the forces placed on posterior teeth. N umerous higher viscosity, packable posterior resin composite restorative materials have been introduced witb bigb expectations as an alternative to amaigam alloy. Among tbe proposed advantages for tbese packable posterior materials arc the potential for achieving positive interproximal contacts, less poly-merization shrinkage, and the claim of being useful for high stress-bearing posterior restorations. These pack-able posterior resin composites embody a variety of
This study evaluated the interaction of five clinical application techniques and the shear bond s... more This study evaluated the interaction of five clinical application techniques and the shear bond strength of four DBAs (OptiBond FL, Clearfil SE Bond, PQ1 and Prime & Bond NT). A hybrid resin composite (Herculite XRV restorative resin) was attached to human dentin surfaces using five application techniques: Group A--adhesive spread with a 3M brush for 30 seconds, followed by compressed air 0.5 cm from the surface for one second to remove the excess adhesive. Group B--adhesive spread with a 3M brush for 30 seconds, followed by compressed air 0.5 cm from the surface for three seconds to remove the excess adhesive. Group C--adhesive spread with 3M brush for 30 seconds, excess adhesive removed with a clean brush, two strokes side by side, no compressed air. Group D--adhesive spread with a Micro-applicator brush for 30 seconds followed by compressed air 0.5 cm from the surface for one second to remove the excess adhesive. Group E--adhesive spread with a Micro-applicator brush for 30 secon...
Quintessence international (Berlin, Germany : 1985), 2001
Bulimia nervosa is among the most common health problems in contemporary society. It is a self-in... more Bulimia nervosa is among the most common health problems in contemporary society. It is a self-induced weight loss syndrome associated with distinct dental manifestations involving physical and psychologic symptoms. It is characterized by recurrent binge-purge episodes that occur at least once a day. This article describes the complete-mouth rehabilitation of a bulimic patient with a generalized enamel erosion of her dentition and a poor esthetic appearance. Porcelain-fused-to-metal restorations were used as the definitive treatment. Good esthetics and high self-esteem were the final results. Comprehensive restorative therapy was applied in this clinical case report to achieve both function and esthetics in a demanding situation.
Quintessence international (Berlin, Germany : 1985), 1997
The dentition of a patient with ectodermal dysplasia was restored with a modified hollowed maxill... more The dentition of a patient with ectodermal dysplasia was restored with a modified hollowed maxillary overdenture opposing a conventional mandibular overdenture. Lingualized occlusion was used because it was the ideal occlusal scheme for this patient to achieve denture stability. The lingual cusps of the maxillary posterior teeth contacted the fossae of the mandibular teeth to create freedom of movement and to prevent lateral interference.
Standardized MOD cavities were prepared in 80 human premolars, which were treated with either adh... more Standardized MOD cavities were prepared in 80 human premolars, which were treated with either adhesive resin or copal varnish and then restored with amalgam. Fracture resistance of these groups was compared after 24 hours of storage, 4 weeks of storage with thermocycling, and after 500 days of storage. The buccal cusps were loaded at an angle of 30 degrees to the tooth long axis until fracture occurred. Additionally, survival curves were compared for adhesive resin and copal varnish groups that had been repeatedly load cycled until fracture occurred. The 24-hour adhesive resin group was significantly stronger than the corresponding copal varnish group (P < 0.05). However, no significant differences between adhesive resin and copal varnish were found for the other thermocycling, extended 500-day storage, or load cycling tests. In conclusion, the strengthening effect of an adhesive resin on teeth restored with MOD amalgam restorations was transient.
This study evaluated the influence of a retentive shoulder design to prevent early failure of thr... more This study evaluated the influence of a retentive shoulder design to prevent early failure of three resin composite build-ups on molars. Ninety-six intact extracted human maxillary third molars were assigned to two groups (n=48) based on occlusal, buccal cusps only and all cusps reduction. The groups were divided into two subgroups: pin retained and non-pin retained build-ups resulting in four groups (n=24), according the cusps reduction: pin retained/partial, pin retained/complete, non-pin retained/partial, non-pin retained/complete. Occlusal reduction was 3 mm with a semi-lunar retentive shoulder of 3 mm and an axial wall height of 1.5 mm. Groups were restored using a microhybrid, flowable or titanium reinforced resin composite. Modified self-curing acrylic resin provisional crowns were fabricated, cemented with non-eugenol temporary cement and thermal cycled. An instron machine applied tension to the provisional crowns parallel to the long axis of the tooth until dislodgement. A ...
Quintessence international (Berlin, Germany : 1985), 2001
The purpose of this study was to evaluate and compare the resistance to crack propagation, as mea... more The purpose of this study was to evaluate and compare the resistance to crack propagation, as measured by the fracture toughness, of some packable posterior resin composites with other posterior resin composite materials. Fracture toughness determinations were made for the 5 packable and the other posterior resin composites using 3-point flexure of beams with a standardized central single-edge notch. Ten beams of each material were tested on an Instron test machine. The maximum loads were determined, from which the fracture toughness values (KIC) were calculated. The data were analyzed statistically using ANOVA and t tests. The resin composites tested demonstrated a range of KIC values. The materials were separated according to the mean KIC values into 5 groups that were statistically different. While 2 packable resin composites had KIC values that were among the highest, the other packables were substantially lower than nonpackables. The intermediate value group consisted of 3 of t...
Quintessence international (Berlin, Germany : 1985), 1998
This article describes a build-up technique that uses a customized acrylic resin shell for restor... more This article describes a build-up technique that uses a customized acrylic resin shell for restoring endodontically treated molars that are involved in three-unit fixed partial denture design. The shell confines the amalgam without impinging on the periodontium to ensure a proper core foundation, an ideal tooth preparation, and a more predictable final restoration.
Quintessence international (Berlin, Germany : 1985), 1995
This article describes a technique for fabricating a custom acrylic resin shell that will ensure ... more This article describes a technique for fabricating a custom acrylic resin shell that will ensure a properly designed amalgam core for the coronally debilitated, endodontically treated posterior tooth. A few simple procedures result in a core foundation for root protection, an ideal crown preparation, and a more predictable final restoration.
Flowable composite is used in a variety of clinical applications; however, the capacity of these ... more Flowable composite is used in a variety of clinical applications; however, the capacity of these materials to resist crack propagation is not well understood. The purpose of this investigation was to compare the resistance to crack propagation of 9 flowable composites as measured by the fracture toughness. The composites studied include AeliteFlo, Crystal Essence, Flow-it, FloRestore, Permaflo, Revolution, Tetric Flow, VersaFlo, and Wave. Ten specimens of each composite were formed with a brass mold with a 3-mm preformed notch. The final dimensions of each specimen were 2 x 4.2 x 20 mm. All specimens were light-polymerized to manufacturer specifications and stored in air for 24 hours. The fracture toughness value, K(IC) (MNm(-3/2)), for each specimen was measured by use of a 3-point bending mode and a single-edge notched beam at a crosshead speed of 0.125 mm/min until fracture. The data were analyzed statistically by use of 1-way analysis of variance, t tests (P&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;.05), and regression analysis. The flowable composites tested showed a spectrum of fracture toughness values ranging from 1.15 +/- 0.10 MNm(-3/2) for Wave to 1.65 +/- 0.13 MNm(-3/2) for Permaflo (significantly different, P&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;.05). The remaining materials formed 1 group with intermediate K(IC) values not different from each other (P&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;gt;.05) but significantly different from Wave and Permaflo. Comparisons of fracture toughness to the filler content by volume of each composite revealed no correlation. This in vitro study concluded that there was no significant difference among 7 of the 9 composites tested in their resistance to fracture. Permaflo showed the greatest resistance to crack propagation. There was no correlation between the filler content by volume and the fracture toughness of these flowable composites.
The Eating Disorders (EDs) are severe and at the times fatal psychosomatic illnesses in which peo... more The Eating Disorders (EDs) are severe and at the times fatal psychosomatic illnesses in which people experience severe disturbances in their eating behavior and related thoughts and emotions. Dental professional are often the first health care providers to recognize signs of any EDs due to the various oral complications that are associated with the condition. Since undiagnosed EDs avoid medical treatment, the role of dental professionals is very crucial to detect the bio-psycho-social disease in the early phase and to provide proper multidisciplinary treatment and recovery. Each eating disorder is unique, and the corresponding treatment varies depending on the degree of severity of the illness and the extent of psychiatric involvement. This article describes the review of two main EDs, anorexia nervosa and bulimia nervosa; and prosthodontic management to rehabilitate patient’s stomatognathic system with these EDs. In this particular case, a bulimic patient who had generalized erosio...
Objectives: The purpose ot this study was to evaluate and compare the resistance to orack propaga... more Objectives: The purpose ot this study was to evaluate and compare the resistance to orack propagation, as measured by the fracture toughness, of some packabie posterior resin composites with other posterior resin composite materiais. Mettiod and materials: Fracture toughness determinations were made for the 5 pacioble and the other posterior resih composites using 3-point fiexure of beams with a standardized oentrai sihgie-edge notch. Ten beams ot each materiai were tested on an Ihstron test machine. The maximum loads were determined, from which the fracture toughness vaiues (K.^) were caicuiated. The data were analyzed statisticaily using ANOVA and à tests. Results: The resin composites tested demonstrated a range of K.^ values. The matenals were separated according to the mean K^-vaiues into 5 groups thaf were statistically different. While 2 packabie resin composites had K.^ values ttiat were among fhe highest, the other paci<abies were substantially lower than nonpackables. The intermediate vaiue group consisted of 3 ot the conventional posterior resin oomposites. Conclusion: There was a very weai< correiafion between fracture fougfiness and reported volume concenfration of particulate reinforcing elements. The posterior resin composites tested exhibited a spectrum of K^. vaiues. The packable resin composites were distributed aiong this spectrum, wifh 2 products exhibiting high potential for resisfance to cracl< propagation. (Quintessence Int 2001:32:206-210) CLiNICAL RELEVANCE: This study determined a range of fracture toughness parameters lor the posterior resin oomposites oonsidered. Restorative materiais with higher K|g values have the potenfiai to withstand the forces placed on posterior teeth. N umerous higher viscosity, packable posterior resin composite restorative materials have been introduced witb bigb expectations as an alternative to amaigam alloy. Among tbe proposed advantages for tbese packable posterior materials arc the potential for achieving positive interproximal contacts, less poly-merization shrinkage, and the claim of being useful for high stress-bearing posterior restorations. These pack-able posterior resin composites embody a variety of
This study evaluated the interaction of five clinical application techniques and the shear bond s... more This study evaluated the interaction of five clinical application techniques and the shear bond strength of four DBAs (OptiBond FL, Clearfil SE Bond, PQ1 and Prime & Bond NT). A hybrid resin composite (Herculite XRV restorative resin) was attached to human dentin surfaces using five application techniques: Group A--adhesive spread with a 3M brush for 30 seconds, followed by compressed air 0.5 cm from the surface for one second to remove the excess adhesive. Group B--adhesive spread with a 3M brush for 30 seconds, followed by compressed air 0.5 cm from the surface for three seconds to remove the excess adhesive. Group C--adhesive spread with 3M brush for 30 seconds, excess adhesive removed with a clean brush, two strokes side by side, no compressed air. Group D--adhesive spread with a Micro-applicator brush for 30 seconds followed by compressed air 0.5 cm from the surface for one second to remove the excess adhesive. Group E--adhesive spread with a Micro-applicator brush for 30 secon...
Quintessence international (Berlin, Germany : 1985), 2001
Bulimia nervosa is among the most common health problems in contemporary society. It is a self-in... more Bulimia nervosa is among the most common health problems in contemporary society. It is a self-induced weight loss syndrome associated with distinct dental manifestations involving physical and psychologic symptoms. It is characterized by recurrent binge-purge episodes that occur at least once a day. This article describes the complete-mouth rehabilitation of a bulimic patient with a generalized enamel erosion of her dentition and a poor esthetic appearance. Porcelain-fused-to-metal restorations were used as the definitive treatment. Good esthetics and high self-esteem were the final results. Comprehensive restorative therapy was applied in this clinical case report to achieve both function and esthetics in a demanding situation.
Quintessence international (Berlin, Germany : 1985), 1997
The dentition of a patient with ectodermal dysplasia was restored with a modified hollowed maxill... more The dentition of a patient with ectodermal dysplasia was restored with a modified hollowed maxillary overdenture opposing a conventional mandibular overdenture. Lingualized occlusion was used because it was the ideal occlusal scheme for this patient to achieve denture stability. The lingual cusps of the maxillary posterior teeth contacted the fossae of the mandibular teeth to create freedom of movement and to prevent lateral interference.
Standardized MOD cavities were prepared in 80 human premolars, which were treated with either adh... more Standardized MOD cavities were prepared in 80 human premolars, which were treated with either adhesive resin or copal varnish and then restored with amalgam. Fracture resistance of these groups was compared after 24 hours of storage, 4 weeks of storage with thermocycling, and after 500 days of storage. The buccal cusps were loaded at an angle of 30 degrees to the tooth long axis until fracture occurred. Additionally, survival curves were compared for adhesive resin and copal varnish groups that had been repeatedly load cycled until fracture occurred. The 24-hour adhesive resin group was significantly stronger than the corresponding copal varnish group (P < 0.05). However, no significant differences between adhesive resin and copal varnish were found for the other thermocycling, extended 500-day storage, or load cycling tests. In conclusion, the strengthening effect of an adhesive resin on teeth restored with MOD amalgam restorations was transient.
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