The reliability of manually traced versus computer-generated growthprediction
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THESIS ABSTRACTS An in vitro evaluation of argon laser cured bond strengths of orthodontic brackets Marni Voorhees Husson Graduate School, University of Alabama at Birm- ingham, 2000 The objective of this study was to record and evaluate bond strengths of metal brackets (Precoated Victory Series, 3M/Unitek) to incisor, premolar, and molar teeth using com- posite resin (Transbond XT, 3M/Unitek) cured by the Accu- Cure 3000 argon laser (LaserMed) for 5 seconds. The shear bond strengths of the brackets bonded with the argon laser were then compared with a sample cured with a conventional high intensity visible-light curing unit (VLC) (Optilux 3M/Unitek). The total sample population consisted of 120 extracted incisor, premolar, and molar teeth divided evenly into 3 groups of 40. Each group of 40 incisor, 40 premolar, and 40 molar teeth was further divided into 3 samples of 30 teeth to be cured for 5 seconds with the AccuCure 3000 argon laser. The remaining 10 teeth were cured for 40 seconds using the high intensity VLC unit. The composite resin system used for all bonding was Transbond XT. The overall mean shear bond strength of the 90 teeth cured with the argon laser was 7.26 MPa and of the 30 teeth cured with the VLC unit was 7.35 MPa. The mean shear bond strength for the incisors group with the argon laser group was 9.41 MPa and for the 10 incisors bonded with the VLC was 10.38 MPa. The mean shear bond strength for the premolar group of 30 bonded with the argon laser group was 6.52 MPa and for the 10 premolars only bonded with the VLC was 7.00 MPa. The mean shear bond strengths for the molar group of 30 bonded with the argon laser was 5.85 MPa and for the molars bonded with the VLC was 4.67 MPa. There was no signifi- cant difference between the bond strengths of the argon laser and the VLC unit in any of the categories tested. The results indicated that the AccuCare 3000 argon laser is a viable alternative to the Optilux VLC unit for the bonding of orthodontic brackets to teeth. The distinct advantage of the argon laser is that it requires considerably less time, 5 seconds compared with the recommended 40 seconds for the VLC unit, to create a clinically acceptable bond. The reliability of manually traced versus computer- generated growth prediction Darcie R. Bradley Graduate School, University of Alabama at Birm- ingham, 2000 The study was conducted to test the accuracy of both the commercially available forecasting software of Dolphin Imaging Systems and the manually traced prediction method described by Jacobson and Sadowsky and Hold- away, in predicting the effects of growth and orthodontic treatment. The sample consisted of pretreatment lateral cephalograms of 32 Class I or II, actively growing, nonex- traction cases whose records were accepted for certification by the American Board of Orthodontists. The computer- generated posttreatment predictions and manually traced Visual Treatment Objectives (VTO) were compared with the actual posttreatment cephalograms using skeletal, den- tal, and soft tissue measurements. Paired t tests revealed that 10 of the 17 parameters evaluated showed statistically significant (P < .05) differences between the actual post- treatment result and the computer-generated prediction. Nine of the 17 parameters evaluated showed statistically significant (P < .05) differences between the actual post- treatment result and the manually traced prediction. DEPARTMENT OF REVIEWS AND ABSTRACTS Edited by Alex Jacobson, DMD, MS, PhD Birmingham, Ala All inquiries regarding information on reviews and abstracts should be directed to the respective authors. For ordering books, contact your local bookstore or write directly to the publishers. Articles or books for review in this department should be addressed to Dr Alex Jacobson, University of Alabama School of Dentistry, University Station/Birmingham, AL 35295 362 American Journal of Orthodontics and Dentofacial Orthopedics/September 2000
Transcript of The reliability of manually traced versus computer-generated growthprediction
THESIS ABSTRACTS
An in vitro evaluation of argon laser cured bondstrengths of orthodontic brackets
Marni Voorhees HussonGraduate School, University of Alabama at Birm-
ingham, 2000
The objective of this study was to record and evaluatebond strengths of metal brackets (Precoated Victory Series,3M/Unitek) to incisor, premolar, and molar teeth using com-posite resin (Transbond XT, 3M/Unitek) cured by the Accu-Cure 3000 argon laser (LaserMed) for 5 seconds. The shearbond strengths of the brackets bonded with the argon laserwere then compared with a sample cured with a conventionalhigh intensity visible-light curing unit (VLC) (Optilux3M/Unitek). The total sample population consisted of 120extracted incisor, premolar, and molar teeth divided evenlyinto 3 groups of 40. Each group of 40 incisor, 40 premolar,and 40 molar teeth was further divided into 3 samples of 30teeth to be cured for 5 seconds with the AccuCure 3000 argonlaser. The remaining 10 teeth were cured for 40 seconds usingthe high intensity VLC unit. The composite resin system usedfor all bonding was Transbond XT. The overall mean shearbond strength of the 90 teeth cured with the argon laser was7.26 MPa and of the 30 teeth cured with the VLC unit was7.35 MPa. The mean shear bond strength for the incisorsgroup with the argon laser group was 9.41 MPa and for the10 incisors bonded with the VLC was 10.38 MPa. The meanshear bond strength for the premolar group of 30 bonded withthe argon laser group was 6.52 MPa and for the 10 premolarsonly bonded with the VLC was 7.00 MPa.
The mean shear bond strengths for the molar group of 30bonded with the argon laser was 5.85 MPa and for the molars
bonded with the VLC was 4.67 MPa. There was no signifi-cant difference between the bond strengths of the argon laserand the VLC unit in any of the categories tested.
The results indicated that the AccuCare 3000 argonlaser is a viable alternative to the Optilux VLC unit for the bonding of orthodontic brackets to teeth. The distinctadvantage of the argon laser is that it requires considerablyless time, 5 seconds compared with the recommended 40 seconds for the VLC unit, to create a clinically acceptable bond.
The reliability of manually traced versus computer-generated growth prediction
Darcie R. BradleyGraduate School, University of Alabama at Birm-
ingham, 2000
The study was conducted to test the accuracy of both thecommercially available forecasting software of DolphinImaging Systems and the manually traced predictionmethod described by Jacobson and Sadowsky and Hold-away, in predicting the effects of growth and orthodontictreatment. The sample consisted of pretreatment lateralcephalograms of 32 Class I or II, actively growing, nonex-traction cases whose records were accepted for certificationby the American Board of Orthodontists. The computer-generated posttreatment predictions and manually tracedVisual Treatment Objectives (VTO) were compared withthe actual posttreatment cephalograms using skeletal, den-tal, and soft tissue measurements. Paired t tests revealedthat 10 of the 17 parameters evaluated showed statisticallysignificant (P < .05) differences between the actual post-treatment result and the computer-generated prediction.Nine of the 17 parameters evaluated showed statisticallysignificant (P < .05) differences between the actual post-treatment result and the manually traced prediction.
DEPARTMENT OF REVIEWS AND ABSTRACTSEdited byAlex Jacobson, DMD, MS, PhDBirmingham, AlaAll inquiries regarding information on reviews and abstracts should be directedto the respective authors. For ordering books, contact your local bookstore or write directly to the publishers. Articles or books for review in this department should beaddressed to Dr Alex Jacobson, University of Alabama School of Dentistry,University Station/Birmingham, AL 35295
362 American Journal of Orthodontics and Dentofacial Orthopedics/September 2000
