Marginal Adaptation of Class II composites and Liver transplant
Marginal adaptation of Class 2 adhesive restorations
Quint Int. May 2008
Objective: Control of microleakage represents a challenge for posterior composite restorations. The technique for composite placement may reduce microleakage. The null hypothesis of this in vitro study was that centripetal incremental insertion of composite resin would result in less microleakage than that obtained with the oblique incremental technique or bulk technique.
Method and Materials: Standardized Class 2 preparations were made in 60 caries-free extracted third molars and randomly assigned to 3 groups (n = 20): (1) oblique incremental insertion technique (control), (2) centripetal incremental insertion technique, and (3) bulk insertion. The teeth were restored with a total-etch adhesive and microhybrid composite resin. The specimens were isolated with nail varnish except for a 2-mm-wide area around the restoration and then thermocycled (1,000 thermal cycles, 5°C/55°C; 30-second dwell time). The specimens were immersed in an aqueous solution of 50% silver nitrate for 24 hours, followed by 8 hours of immersion in a photo-developing solution and subsequently evaluated for leakage. The microleakage scores (0 to 4) obtained from the occlusal and cervical walls were analyzed with median nonparametric tests (P < .05). Results: The null hypothesis was rejected. All techniques attained statistically similar dentin microleakage scores (P = .15). The centripetal insertion technique displayed significantly less microleakage than the oblique technique at the enamel margins (P = .04). Conclusion: None of the techniques eliminated marginal microleakage in Class 2 preparations. However, in occlusal areas, the centripetal technique performed significantly better than the other techniques. To know details of centripetal tech and get a copy of full paper CLICK HERE
What is the effect of method of curing composites on directional shrinkage ?
Shrinkage direction was not significantly affected by the orientation of the incoming curing light.
Dental Care extremely important after Liver Transplant
LIVER transplant patients will receive special dental care after their operations under a scheme to be launched by NHS Lothian.
The patients will receive dental assessments before and after their transplants and advice on how to avoid problems with their teeth.
Patients from the Lothians needing dental treatment that can't be provided by their local dentist will have their dental care co-ordinated through the dental unit at the city's Royal Infirmary.
Transplant patients are at risk of developing oral problems. The three-year initiative is being funded by the Scottish Government.
Dr Colwyn Jones, a consultant in dental public health for NHS Lothian, said: "NHS Lothian is committed to improving the dental health of everyone who lives in Lothian, and this funding will allow us to provide valuable help to people we know are at risk of subsequent problems with their teeth.
"Transplants are becoming more common and recipients of transplants have to be very careful around their health in general. We have to guard against infection as transplant patients are immuno-compromised."
The Royal Infirmary of Edinburgh is home to the Scottish Liver Transplant Unit, which conducts between 50 and 60 transplants a year.
Here is a nice presentation thats a great stress buster, download and you will enjoy this fantastic narration.
Study of Canine helps understand human Evolution
ScienceDaily (June 26, 2008) — Measuring and testing the teeth of living primates could provide a window into the behavior of the earliest human ancestors, based on their fossilized remains. Research funded by the National Science Foundation and led by University of Arkansas anthropologist Michael Plavcan takes us one step closer to understanding the relationship between canine teeth, body size and the lives of primates.
In an article published in American Journal of Physical Anthropology, Plavcan and colleague Christopher B. Ruff of Johns Hopkins School of Medicine report on an initial examination of the function of the shape of canine teeth in primates. This is the first published comparative analysis of canine strength for primates. More here
Quint Int. May 2008
Objective: Control of microleakage represents a challenge for posterior composite restorations. The technique for composite placement may reduce microleakage. The null hypothesis of this in vitro study was that centripetal incremental insertion of composite resin would result in less microleakage than that obtained with the oblique incremental technique or bulk technique.
Method and Materials: Standardized Class 2 preparations were made in 60 caries-free extracted third molars and randomly assigned to 3 groups (n = 20): (1) oblique incremental insertion technique (control), (2) centripetal incremental insertion technique, and (3) bulk insertion. The teeth were restored with a total-etch adhesive and microhybrid composite resin. The specimens were isolated with nail varnish except for a 2-mm-wide area around the restoration and then thermocycled (1,000 thermal cycles, 5°C/55°C; 30-second dwell time). The specimens were immersed in an aqueous solution of 50% silver nitrate for 24 hours, followed by 8 hours of immersion in a photo-developing solution and subsequently evaluated for leakage. The microleakage scores (0 to 4) obtained from the occlusal and cervical walls were analyzed with median nonparametric tests (P < .05). Results: The null hypothesis was rejected. All techniques attained statistically similar dentin microleakage scores (P = .15). The centripetal insertion technique displayed significantly less microleakage than the oblique technique at the enamel margins (P = .04). Conclusion: None of the techniques eliminated marginal microleakage in Class 2 preparations. However, in occlusal areas, the centripetal technique performed significantly better than the other techniques. To know details of centripetal tech and get a copy of full paper CLICK HERE
What is the effect of method of curing composites on directional shrinkage ?
Shrinkage direction was not significantly affected by the orientation of the incoming curing light.
Dental Care extremely important after Liver Transplant
LIVER transplant patients will receive special dental care after their operations under a scheme to be launched by NHS Lothian.
The patients will receive dental assessments before and after their transplants and advice on how to avoid problems with their teeth.
Patients from the Lothians needing dental treatment that can't be provided by their local dentist will have their dental care co-ordinated through the dental unit at the city's Royal Infirmary.
Transplant patients are at risk of developing oral problems. The three-year initiative is being funded by the Scottish Government.
Dr Colwyn Jones, a consultant in dental public health for NHS Lothian, said: "NHS Lothian is committed to improving the dental health of everyone who lives in Lothian, and this funding will allow us to provide valuable help to people we know are at risk of subsequent problems with their teeth.
"Transplants are becoming more common and recipients of transplants have to be very careful around their health in general. We have to guard against infection as transplant patients are immuno-compromised."
The Royal Infirmary of Edinburgh is home to the Scottish Liver Transplant Unit, which conducts between 50 and 60 transplants a year.
Here is a nice presentation thats a great stress buster, download and you will enjoy this fantastic narration.
Study of Canine helps understand human Evolution
ScienceDaily (June 26, 2008) — Measuring and testing the teeth of living primates could provide a window into the behavior of the earliest human ancestors, based on their fossilized remains. Research funded by the National Science Foundation and led by University of Arkansas anthropologist Michael Plavcan takes us one step closer to understanding the relationship between canine teeth, body size and the lives of primates.
In an article published in American Journal of Physical Anthropology, Plavcan and colleague Christopher B. Ruff of Johns Hopkins School of Medicine report on an initial examination of the function of the shape of canine teeth in primates. This is the first published comparative analysis of canine strength for primates. More here
posted by Healthmantra at
9:08 PM
0 Comments:
Post a Comment
<< Home