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A cephalometric study of the accuracy of a computerized growth prediction in Class II four bicuspid extraction cases
Volume 102
Reviews atzd abstracts
Number 5
for temporomandibular joint (TMJ) problems. Part II "Helping Your Body Heal: A Self-Help and Reference Guide" is dedicated to treatment with a home exercise plan, nutrition consideration, stress management, coping, and maintaining a normal life. The last part, on professional treatment, discusses the examination and therapy for T M D problems. The book is well-written, makes good use of drawings, and has received favorable reviews from authorities in the field. Since the public has used the colloquial expression "TMJ," the book uses this term. This is a minor problem since the specialties now use T M D to refer to actual departures from normal. Nonetheless, it is this reviewer's opinion that this little book would be quite valuable to the thousands o f patients undergoing treatment in dental offices today. Patients would surely understand their problems better and would have a higher likelihood o f success. Alex Jacobson
Thesis abstracts Effects of thermal stress on orthodontic bonding systems. S. H. Lee, Los Angeles; USC School of Dentistry, 1992
487
system has not been tested in cases that require bicuspid extraction for treatment of the malocclusion. To test the accuracy of the computerized prediction in Class II four bicuspid extraction cases, the records for 30 previously treated cases (13 male, 17 female) were selected. Pretreatment cephalograms (and other appropriate data) were submitted to Rocky Mountain along with 23 criteria describing the treatment methods used. The resultant computerized predictions were then compared with the actual posttreatment result by using 18 linear and 7 angular measurements. The differences were statistically analyzed for significance to determine the accuracy of the computerized prediction. The computerized prediction was found to be statistically accurate for 22 of 25 variables tested. Prediction of angular variables was found to be accurate, however, variability exists in the ability to accurately estimate linear growth change or generate an accurate composite prediction. The computer was found to be inaccurate in the prediction of cranial base length and poor in the estimation of the effects of treatment on maxillary growth and development. Further study is needed to determine whether the Rocky Mountain computerized growth prediction method can accurately predict when excess mandibular rotation will occur.
Light-cured glass ionomer as an orthodontic adhesive. M. D. Minnich, Los Angeles: USC School of Dentistry, 1992
Many studies exist that show conflicting results regarding thermal stress on orthodontic bonding systems. The purpose of this study was to determine the effect of thermal stress on three types of composite resins used to bond orthodontic brackets. Four hundred fifty stainless steel orthodontic brackets were bonded to human molars with three different orthodontic composite resin adhesives. The samples were divided into five groups, and four were subjected to different numbers of thermocycling (100, 500, 1500, and 2500 cycles) in water baths of I0 ~ and 50 ~ C, 25 seconds in each bath. One group was a control, stored in 37 ~ C water bath. With the Instron, half of each group was tested for shear bond strengths and the other half for tensile. The data were tested statistically. Thermocycling significantly affected the tensile bond strengths but not the shear bond strengths. Tensile bond strengths were significantly lower after thernzocycling, but no relationship was found between t/re number of o'cles and the decrease in strengths. The importance of incorporating thermocycling hz orthodontic bond strength tests is therefore questioned.
A cephalometric study of the accuracy of a computerized growth prediction in Class II four bicuspid extraction cases. Matt Mac Lean, Los Angeles: USC School of Dentistry, 1992
Accurate prediction of the expected growth of an orthodontic patient is important in treatment planning. The use of computers to help predict growth and the effects of treatment on orthodontic patients has been made commercially available through Rocky Mountain Data Systems. The accuracy of this
A light-cured glass ionomer possesses several characteristics that make it a potentially desirable orthodontic adhesive: (1) fluoride releasing, (2) ease of debonding (no enamel damage), and (3) controllable working time of material. Shear bond strengths were measured to evaluate various tooth surface preparations for a light-cured glass ionomer. Bond strengths were measured for Vitrabond in eight test groups (various acid etch types and times). Two comparative adhesives, Transbond (accepted light-cured composite adhesive) and Ketac-Cem (standard glass ionomer) were also measured. Each group consisted of 10 extracted human teeth bonded to mini dyna bond premolar brackets. The highest bond strength Vitrabond test group (Type: phosphoric acid etch; Time: 60 seconds) was not significantly lower than Transbond, but significantly higher (p < 0.05) than Ketac-Cem. The correlation between amount of residual adhesive and bond strength for each surface preparation was found to be nonsignificant (p > 0.05). Enamel damage was not observed throughout the experiment. Vitrabonds superior bond strength over Ketac-Dem and hnproved characteristics (fluoride release, debonding ease) compared with Transbond, suggest its potential use as an orthodontic adhesive.
Bond strengths of six adhesives for ceramic and metal orthodontic brackets. H. M, Nakamura and R. L. Leung, Los Angeles: USC School of Dentistry, 1992
The study investigated the bond strengths of representative composites, a glass ionomer cement and a light-cured glass ionomer liner/base, as orthodontic adhesives for metal
Reviews atzd abstracts
Number 5
for temporomandibular joint (TMJ) problems. Part II "Helping Your Body Heal: A Self-Help and Reference Guide" is dedicated to treatment with a home exercise plan, nutrition consideration, stress management, coping, and maintaining a normal life. The last part, on professional treatment, discusses the examination and therapy for T M D problems. The book is well-written, makes good use of drawings, and has received favorable reviews from authorities in the field. Since the public has used the colloquial expression "TMJ," the book uses this term. This is a minor problem since the specialties now use T M D to refer to actual departures from normal. Nonetheless, it is this reviewer's opinion that this little book would be quite valuable to the thousands o f patients undergoing treatment in dental offices today. Patients would surely understand their problems better and would have a higher likelihood o f success. Alex Jacobson
Thesis abstracts Effects of thermal stress on orthodontic bonding systems. S. H. Lee, Los Angeles; USC School of Dentistry, 1992
487
system has not been tested in cases that require bicuspid extraction for treatment of the malocclusion. To test the accuracy of the computerized prediction in Class II four bicuspid extraction cases, the records for 30 previously treated cases (13 male, 17 female) were selected. Pretreatment cephalograms (and other appropriate data) were submitted to Rocky Mountain along with 23 criteria describing the treatment methods used. The resultant computerized predictions were then compared with the actual posttreatment result by using 18 linear and 7 angular measurements. The differences were statistically analyzed for significance to determine the accuracy of the computerized prediction. The computerized prediction was found to be statistically accurate for 22 of 25 variables tested. Prediction of angular variables was found to be accurate, however, variability exists in the ability to accurately estimate linear growth change or generate an accurate composite prediction. The computer was found to be inaccurate in the prediction of cranial base length and poor in the estimation of the effects of treatment on maxillary growth and development. Further study is needed to determine whether the Rocky Mountain computerized growth prediction method can accurately predict when excess mandibular rotation will occur.
Light-cured glass ionomer as an orthodontic adhesive. M. D. Minnich, Los Angeles: USC School of Dentistry, 1992
Many studies exist that show conflicting results regarding thermal stress on orthodontic bonding systems. The purpose of this study was to determine the effect of thermal stress on three types of composite resins used to bond orthodontic brackets. Four hundred fifty stainless steel orthodontic brackets were bonded to human molars with three different orthodontic composite resin adhesives. The samples were divided into five groups, and four were subjected to different numbers of thermocycling (100, 500, 1500, and 2500 cycles) in water baths of I0 ~ and 50 ~ C, 25 seconds in each bath. One group was a control, stored in 37 ~ C water bath. With the Instron, half of each group was tested for shear bond strengths and the other half for tensile. The data were tested statistically. Thermocycling significantly affected the tensile bond strengths but not the shear bond strengths. Tensile bond strengths were significantly lower after thernzocycling, but no relationship was found between t/re number of o'cles and the decrease in strengths. The importance of incorporating thermocycling hz orthodontic bond strength tests is therefore questioned.
A cephalometric study of the accuracy of a computerized growth prediction in Class II four bicuspid extraction cases. Matt Mac Lean, Los Angeles: USC School of Dentistry, 1992
Accurate prediction of the expected growth of an orthodontic patient is important in treatment planning. The use of computers to help predict growth and the effects of treatment on orthodontic patients has been made commercially available through Rocky Mountain Data Systems. The accuracy of this
A light-cured glass ionomer possesses several characteristics that make it a potentially desirable orthodontic adhesive: (1) fluoride releasing, (2) ease of debonding (no enamel damage), and (3) controllable working time of material. Shear bond strengths were measured to evaluate various tooth surface preparations for a light-cured glass ionomer. Bond strengths were measured for Vitrabond in eight test groups (various acid etch types and times). Two comparative adhesives, Transbond (accepted light-cured composite adhesive) and Ketac-Cem (standard glass ionomer) were also measured. Each group consisted of 10 extracted human teeth bonded to mini dyna bond premolar brackets. The highest bond strength Vitrabond test group (Type: phosphoric acid etch; Time: 60 seconds) was not significantly lower than Transbond, but significantly higher (p < 0.05) than Ketac-Cem. The correlation between amount of residual adhesive and bond strength for each surface preparation was found to be nonsignificant (p > 0.05). Enamel damage was not observed throughout the experiment. Vitrabonds superior bond strength over Ketac-Dem and hnproved characteristics (fluoride release, debonding ease) compared with Transbond, suggest its potential use as an orthodontic adhesive.
Bond strengths of six adhesives for ceramic and metal orthodontic brackets. H. M, Nakamura and R. L. Leung, Los Angeles: USC School of Dentistry, 1992
The study investigated the bond strengths of representative composites, a glass ionomer cement and a light-cured glass ionomer liner/base, as orthodontic adhesives for metal