Electrochemical Behaviour and Galvanic Effects of Titanium Implants Coupled to Metallic Suprastructures in Artificial Saliva.

The aim of the present study is to analyze the electrochemical behavior of five different dental alloys: two cobalt-chromium alloys (CoCr and CoCr-c), one nickel-chromium-titanium alloy (NiCrTi), one gold-palladium alloy (Au), and one titanium alloy (Ti6Al4V), and the galvanic effect when they are coupled to titanium implants (TiG2). It was carried out by electrochemical techniques (open circuit measurements, potentiodynamic curves and Zero-Resistance Ammetry) in artificial saliva (AS), with and without fluorides in different acidic conditions. The studied alloys are spontaneously passivated, but NiCrTi alloy has a very narrow passive domain and losses its passivity in presence of fluorides, so is not considered as a good option for implant superstructures. Variations of pH from 6.5 to 3 in artificial saliva do not change the electrochemical behavior of Ti, Ti6Al4V, and CoCr alloys, and couples, but when the pH of the artificial saliva is below 3.5 and the fluoride content is 1000 ppm Ti and Ti6Al4V starts actively dissolving, and CoCr-c superstructures coupled to Ti show acceleration of corrosion due to galvanic effects. Thus, NiCrTi is not recommended for implant superstructures because of risk of Ni ion release to the body, and fluorides should be avoided in acidic media because Ti, Ti6Al4V, and CoCr-c superstructures show galvanic corrosion. The best combinations are Ti/Ti6Al4V and Ti/CoCr as alternative of noble gold alloys.

Decontamination of dental implant surface in peri-implantitis treatment: A literature review

Etiological treatment of peri-implantitis aims to reduce the bacterial load within the peri-implant pocket and decontaminate the implant surface in order to promote osseointegration. The aim of this literature review was to evaluate the efficacy of different methods of implant surface decontamination. A search was conducted using the PubMed (Medline) database, which identified 36 articles including in vivo and in vitro studies, and reviews of different decontamination systems (chemical, mechanical, laser and photodynamic therapies). There is sufficient consensus that, for the treatment of peri-implant infections, the mechanical removal of biofilm from the implant surface should be supplemented by chemical decontamination with surgical access. However, more long-term research is needed to confirm this and to establish treatment protocols responding to different implant characterics (AU)

Decontamination of dental implant surface in peri-implantitis treatment: a literature review.

Etiological treatment of peri-implantitis aims to reduce the bacterial load within the peri-implant pocket and decontaminate the implant surface in order to promote osseointegration. The aim of this literature review was to evaluate the efficacy of different methods of implant surface decontamination. A search was conducted using the PubMed (Medline) database, which identified 36 articles including in vivo and in vitro studies, and reviews of different decontamination systems (chemical, mechanical, laser and photodynamic therapies). There is sufficient consensus that, for the treatment of peri-implant infections, the mechanical removal of biofilm from the implant surface should be supplemented by chemical decontamination with surgical access. However, more long-term research is needed to confirm this and to establish treatment protocols responding to different implant characterics.

Implant treatment in patients with osteoporosis

Osteoporosis is very common, particularly in post-menopausal women and is characterized by a decrease in bonemass and strength. Osteoporosis also affects the jawbone and it is considered a potential contraindication to placementof dental implants. The present paper reviews the literature regarding the effect of osteoporosis on osseointegrationof implants. Experimental models have shown that osteoporosis affects the process of osseointegration,which can be reversed by treatment. However, studies in subjects with osteoporosis have shown no differencesin survival of the implants compared to healthy individuals. Therefore, osteoporosis cannot be considered a contraindicationfor implant placement. Oral bisphosphonates are the most commonly used pharmacological agents inthe treatment of osteoporosis. Although there have been cases of osteonecrosis of the jaw in patients treated withbisphosphonates, they are very rare and it is more usually associated with intravenous bisphosphonates in patientswith neoplasms or other serious diseases. Nevertheless, patients treated with bisphosphonates must be informed inwriting about the possibility of this complication and must give informed consent. Ceasing to use bisphosphonatesbefore implant placement does not seem to be necessary (AU)

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Implant treatment in patients with osteoporosis.

Osteoporosis is very common, particularly in post-menopausal women and is characterized by a decrease in bone mass and strength. Osteoporosis also affects the jawbone and it is considered a potential contraindication to placement of dental implants. The present paper reviews the literature regarding the effect of osteoporosis on osseointegration of implants. Experimental models have shown that osteoporosis affects the process of osseointegration, which can be reversed by treatment. However, studies in subjects with osteoporosis have shown no differences in survival of the implants compared to healthy individuals. Therefore, osteoporosis cannot be considered a contraindication for implant placement. Oral bisphosphonates are the most commonly used pharmacological agents in the treatment of osteoporosis. Although there have been cases of osteonecrosis of the jaw in patients treated with bisphosphonates, they are very rare and it is more usually associated with intravenous bisphosphonates in patients with neoplasms or other serious diseases. Nevertheless, patients treated with bisphosphonates must be informed in writing about the possibility of this complication and must give informed consent. Ceasing to use bisphosphonates before implant placement does not seem to be necessary.

Effects of diabetes on the osseointegration of dental implants.

The increased prevalence of diabetes mellitus has become a public health problem. Hyperglycaemia entails a rise in the morbidity and mortality of these patients. Although a direct relationship with periodontal disease has already been shown, little is known about the results of dental implants in diabetics. The present paper reviews the bibliography linking the effect of diabetes on the osseointegration of implants and the healing of soft tissue. In experimental models of diabetes, a reduced level of bone-implant contact has been shown, and this can be reversed by means of treatment with insulin. Compared with the general population, a higher failure rate is seen in diabetic patients. Most of these occur during the first year of functional loading, seemingly pointing to the microvascular complications of this condition as a possible causal factor. These complications also compromise the healing of soft tissues. It is necessary to take certain special considerations into account for the placement of implants in diabetic patient. A good control of plasma glycaemia, together with other measures, has been shown to improve the percentages of implant survival in these patients.

Effects of diabetes on the osseointegration of dental implants

El incremento en la prevalencia de la diabetes mellitus se ha convertido en un problema de salud pública. La hiperglucemia conlleva un aumento en la morbilidad y mortalidad de estos pacientes. Aunque ya se ha demostrado una relación directa con la enfermedad periodontal, poco se conoce sobre el resultado del implante dental en el sujeto diabético. En el presente trabajo se revisa la bibliografía que relaciona el efecto de la diabetes sobre la oseointegración de los implantes y la cicatrización de los tejidos blandos. En modelos experimentales de diabetes se ha demostrado una reducción en los niveles de contacto hueso-implante, que puede ser revertida mediante tratamiento con insulina. En el paciente diabético, comparado con la población general, se observa un mayor índice de fracaso. La mayoría de ellos se producen durante el primer año de carga funcional, lo que parece señalar a las complicaciones microvasculares de la enfermedad como posible factor causal. Dichas complicaciones comprometen también la cicatrización de los tejidos blandos. Se hace necesario establecer unas consideraciones especiales para la colocación de implantes en el paciente diabético. El buen control de la glucemia plasmática, junto con otras medidas, ha demostrado mejorar los porcentajes de supervivencia de los implantes en estos pacientes

The increased prevalence of diabetes mellitus has become a public health problem. Hyperglycaemia entails a rise in the morbidity and mortality of these patients. Although a direct relationship with periodontal disease has already been shown, little is known about the results of dental implants in diabetics. The present paper reviews the bibliography linking the effect of diabetes on the osseointegration of implants and the healing of soft tissue. In experimental models of diabetes, a reduced level of bone-implant contact has been shown, and this can be reversed by means of treatment with insulin. Compared with the general population, a higher failure rate is seen in diabetic patients. Most of these occur during the first year of functional loading, seemingly pointing to the microvascular complications of this condition as a possible causal factor. These complications also compromise the healing of soft tissues. It is necessary to take certain special considerations into account for the placement of implants in diabetic patient. A good control of plasma glycaemia, together with other measures, has been shown to improve the percentages of implant survival in these patients