- Email: [email protected]
Resistance of abutment teeth restored with different methods
98
J. Dent.
1989;
17:
No. 2
difference demonstrated between the degree of root resorption and the duration of the treatment. An increasing degree of root resorption with age was demonstrated for the group of patients treated by means of the Burstone technique. No such difference was demonstrated for patients treated with the Begg technique. There was no statistically significant difference in the degree of root resorption between the two orthodontic methods. (2 1 references) Einar Berg
Pasienters etfaring med kjeveortopedisk behandling. (Patient experience of orthodontic treatment.) Qgaard 6. (1988) Den Norske Tannlegefor. Tid 9%. 178-181. A group of 51 patients, representing all individuals of a 1968 cohort living in a small community in eastern Norway who had received such treatment, were interviewed regarding their evaluation of the results of orthodontic treatment. The treatment had been carried out on average 5.7 years previously by different orthodontists. The most common indication for treatment was correction of tooth positions for aesthetic reasons. Nearly 75 per cent of the patients had experienced some pain after activation of the appliance. However, the pain did not last for more than a few days. A similar proportion claimed that the appliance had at times ulcerated or irritated the oral mucosa. Ninety-two per cent found that the orthodontic treatment had been as expected or better than expected. Sixty-five per cent of the patients were well satisfied with the result of treatment, with only 4 per cent expressing dissatisfaction. A statistically significant correlation (r = 0.5) was recorded between patient evaluation of the treatment result and the frequency of pain after activation of the appliance. The results indicate that Norwegian orthodontists offer a service with which the patients are well satisfied Furthermore, they indicate that patients experiencing pain during orthodontic treatment should be identified and the activation of their appliances reduced. (4 references) Einar Berg
Resistenza alla frattura di pilastri protesici ricostruiti con differenti metodiche. (Resistance of abutment teeth restored with different methods). Cassaro A. (1988) Stomat Medit. 8, 133-l 38. The prosthetic preparation of endodontically treated abutment teeth reduces the thickness of mineralized tissues already weakened by the pathological processes or the endodontic treatment, which increases the possibility of fracture. The aim of this study was to determine whether the resistance to fracture of endodontically treated abutments could be increased by specific restorative intracoronal techniques. Sixty recently extracted sound teeth were endodontically treated and
then prepared for a Class II cavity. They were divided at random into six groups; those restored with amalgam, those restored with composite without etching, those restored with amalgam plus composite without etching, those restored with etched composite, those restored with etched composite plus amalgam, together with unrestored teeth as a control. All teeth were then prepared for a full veneer crown. They were then mounted in acrylic supports and subjected to different loads until fracture. The best results were obtained with teeth restored with etched composite and amalgam. Etching permits a greater bonding to the hard structures of the tooth and a better adaptation of the materials used for the final restoration. The layer of composite creates a link between the residual walls of the tooth and prevents tooth fracture due to volumetric variations of the amalgam caused by thermal imbalance in the oral caviv. (17 references) Mario Pezzoli
ContribuiGao ao estudo estereom&rico dos valores angulares entre as vertentes de parede anterior da fossa mandibular, em brasileiros adultes. (A stereometric study of the angle between the slopes of the anterior surface of the articular fossa in Brazilian adults.) Fl6ridi Sobrinho A. (1986) Rev. Fat. Odont. S. Paul0 24, 45-55. This stereo-photogrammetric study aimed to resolve conflicting conclusions of previous flat-plane investigations into the topography and demography of the anterior surface of the articular fossa of the temporal bone. One hundred and twenty museum skulls were examined, comprising 60 specimens of each sex and equal numbers of edentulous and partially edentulous. Sixty specimens were Caucasian, 43 Negroid and 17 mixed race. The skulls were mounted in a craniostat and orientated to the Frankfort and frontal planes. The dihedral glenoid angle between the medial and lateral slopes of the anterior surface of the articular fossa in its middle third was calculated from geometric coordinates of the fossa. The mean glenoid angle was 149” with a range between 1 IO” and 180”. There was no difference between the values for males and females, or between edentulous and partially dentate subjects. No correlation could be demonstrated between the size of the angle and the recorded age of the specimens. A mean difference of 2-3” was found between the left and right angles but this was not statistically significant. In contrast to other investigations, no articular fossae with flat or convex anterior surfaces were found. Furthermore, the topography of this area of the fossa is not altered by the loss of the natural dentition. It is possible, therefore, that any altered stresses are transmitted to the atticular disc and ligaments. (23 references) M. J. Shapiro
J. Dent.
1989;
17:
No. 2
difference demonstrated between the degree of root resorption and the duration of the treatment. An increasing degree of root resorption with age was demonstrated for the group of patients treated by means of the Burstone technique. No such difference was demonstrated for patients treated with the Begg technique. There was no statistically significant difference in the degree of root resorption between the two orthodontic methods. (2 1 references) Einar Berg
Pasienters etfaring med kjeveortopedisk behandling. (Patient experience of orthodontic treatment.) Qgaard 6. (1988) Den Norske Tannlegefor. Tid 9%. 178-181. A group of 51 patients, representing all individuals of a 1968 cohort living in a small community in eastern Norway who had received such treatment, were interviewed regarding their evaluation of the results of orthodontic treatment. The treatment had been carried out on average 5.7 years previously by different orthodontists. The most common indication for treatment was correction of tooth positions for aesthetic reasons. Nearly 75 per cent of the patients had experienced some pain after activation of the appliance. However, the pain did not last for more than a few days. A similar proportion claimed that the appliance had at times ulcerated or irritated the oral mucosa. Ninety-two per cent found that the orthodontic treatment had been as expected or better than expected. Sixty-five per cent of the patients were well satisfied with the result of treatment, with only 4 per cent expressing dissatisfaction. A statistically significant correlation (r = 0.5) was recorded between patient evaluation of the treatment result and the frequency of pain after activation of the appliance. The results indicate that Norwegian orthodontists offer a service with which the patients are well satisfied Furthermore, they indicate that patients experiencing pain during orthodontic treatment should be identified and the activation of their appliances reduced. (4 references) Einar Berg
Resistenza alla frattura di pilastri protesici ricostruiti con differenti metodiche. (Resistance of abutment teeth restored with different methods). Cassaro A. (1988) Stomat Medit. 8, 133-l 38. The prosthetic preparation of endodontically treated abutment teeth reduces the thickness of mineralized tissues already weakened by the pathological processes or the endodontic treatment, which increases the possibility of fracture. The aim of this study was to determine whether the resistance to fracture of endodontically treated abutments could be increased by specific restorative intracoronal techniques. Sixty recently extracted sound teeth were endodontically treated and
then prepared for a Class II cavity. They were divided at random into six groups; those restored with amalgam, those restored with composite without etching, those restored with amalgam plus composite without etching, those restored with etched composite, those restored with etched composite plus amalgam, together with unrestored teeth as a control. All teeth were then prepared for a full veneer crown. They were then mounted in acrylic supports and subjected to different loads until fracture. The best results were obtained with teeth restored with etched composite and amalgam. Etching permits a greater bonding to the hard structures of the tooth and a better adaptation of the materials used for the final restoration. The layer of composite creates a link between the residual walls of the tooth and prevents tooth fracture due to volumetric variations of the amalgam caused by thermal imbalance in the oral caviv. (17 references) Mario Pezzoli
ContribuiGao ao estudo estereom&rico dos valores angulares entre as vertentes de parede anterior da fossa mandibular, em brasileiros adultes. (A stereometric study of the angle between the slopes of the anterior surface of the articular fossa in Brazilian adults.) Fl6ridi Sobrinho A. (1986) Rev. Fat. Odont. S. Paul0 24, 45-55. This stereo-photogrammetric study aimed to resolve conflicting conclusions of previous flat-plane investigations into the topography and demography of the anterior surface of the articular fossa of the temporal bone. One hundred and twenty museum skulls were examined, comprising 60 specimens of each sex and equal numbers of edentulous and partially edentulous. Sixty specimens were Caucasian, 43 Negroid and 17 mixed race. The skulls were mounted in a craniostat and orientated to the Frankfort and frontal planes. The dihedral glenoid angle between the medial and lateral slopes of the anterior surface of the articular fossa in its middle third was calculated from geometric coordinates of the fossa. The mean glenoid angle was 149” with a range between 1 IO” and 180”. There was no difference between the values for males and females, or between edentulous and partially dentate subjects. No correlation could be demonstrated between the size of the angle and the recorded age of the specimens. A mean difference of 2-3” was found between the left and right angles but this was not statistically significant. In contrast to other investigations, no articular fossae with flat or convex anterior surfaces were found. Furthermore, the topography of this area of the fossa is not altered by the loss of the natural dentition. It is possible, therefore, that any altered stresses are transmitted to the atticular disc and ligaments. (23 references) M. J. Shapiro