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An analysis of response following mandibular advancement surgery
Volume 80 Number 3
Reviews and abstracts
339
subgingivally located orthodontic bands (which direct-bonded attachments should avoid). After the 30-month experimental period, a high level of oral hygiene and gingival status, as well as low caries activity, was still apparent, with only minor and insignificant differences between the orthodontic and control groups. T. M. Graber
Modular
Orthodontics
William L. and Robert C. Wilson Denver,
1981,
Rocky
Mountain
Orthodontics.
I74 pages,
illustrated.
Price,
$59.50
This well-illustrated, practical, case-bound manual is a presentation of concepts and actual mechanotherapy of a technique developed in the past 10 years by the senior author. After a discussion of modular orthodontic concepts in the foreword, the balance of the manual is divided into five parts. Part 1, ‘ ‘Treatment Applications, ’ ’ discusses rapid molar and bicuspid distalization, rapid anterior intrusion and advancement, and multiple mandibular anchorage. Part 2 presents and describes the modular orthodontic components, such as the bimetric distalizing arch, 3D lingual arch, 3D sectional arch, and 3D lingual tube. A special section is written to acquaint auxiliary personnel with information that might be helpful in supporting the orthodontist. Part 3 has additional discussions and illustrations of bimetric distalizing arch treatment for various malocclusion categories. Also covered are additional aspects of 3D lingual arch treatment. Part 4, called “Modular Functional Treatment, ” is presented as a fixed appliance alternative to removable functional appliances. Part 5 consists of a summary, a quick reference guide, and a materials list. The quality of book production is high, with excellent line drawings particularly. It satisfies its original purpose well-to present an explicit “how to” reference for the use of modules. T. M. Graber
Thesis abstracts An Analysis
of Response
Following
Mandibular
Advancement
Surgery
Ronald L. Champion University
of the Pacijic,
San Francisco,
1981
Lateral cephalometric landmarks were evaluated for change, before and after surgery, in a study of twenty-one mandibular-advancement cases. The surgical technique for advancement was limited to either sag&al split ramus osteotomy, or C osteotomy. The mean postsurgical interval was 22 months. The wide range of individual variation resulted in large standard deviations which precluded definitive conclusions. However, a number of mean changes were consistent with recent findings from similar investigations. Traction via the surgical splint had an orthodontic effect upon the maxillary dentition. Postsurgical return of the mandible occurred (x = 30 percent). However, the net gain was
substantial (% = 5.5 mm.). As a result of adjustment in gonion position. the posterior facial height decreased and the mandibular plane angle increased. The increase observed in anterior facial height was negligible. The hyoid bone returned toward, but did not reach, its presurgical position. The distance between the hyoid bone and mention increased, which supports other findings of adaptation within the suprahyoid muscle group.
The Effect of Retraction Lip Position Craig T. Holdaway Univrrsity of the Pacific,
of Maxillary
San Francisco,
Anterior
Teeth Upon
1981
The purpose of this investigation was to determine if a reliable relationship could be established between tooth and lip retraction. The following factors were considered: (1) Age, (2) sex, (3) race, (4) length of study, and (5) lip strain. The sample consisted of pretreatment, posttreatment, and lo-year follow-up cephalograms of thirty-eight patients. The explained variation of lip-to-tooth novement at the retention period was 43 percent. Including a strain factor increased the explained variation to 53 percent. Explained variance increased to 77 percent and 86 percent respectively, when the retention period and retention period plus lip strain factor were considered. The present findings indicate that a reliable relationship between incisor retraction and lip position can be established if retention time and pretreatment lip strain are taken into consideration.
The Relationship EMween Clinical Measurements of the Gingival Tii Mark McDonough University
qf the Pacific.
San Francisco,
I981
The purpose of this study was to determine if color slides of the gingival tissue in the mandibular incisor region accurately represent this tissue clinically. A sample of ten young, ten adolescent, and ten adult patients with varying gingival tissue heights (free gingival margin to mucogingival junction) were selected from the orthodontic clinic at the University of the Pacific School of Dentistry. The following clinical and photographic measurements were performed on each of the thirty subjects on two separate occasions. Clinical measurements 1. Height of the gingival tissue on the midfacial surface of the four mandibular incisors. To measure this height, two methods were used to locate the mocogingival junction. 2. Depth of the gingival sulcus. Photographic
measurements
1. Height of the gingival tissue measured from two color slides, one taken with retractors and one taken without. The clinical and photographic measurements were analyzed and compared.
Reviews and abstracts
339
subgingivally located orthodontic bands (which direct-bonded attachments should avoid). After the 30-month experimental period, a high level of oral hygiene and gingival status, as well as low caries activity, was still apparent, with only minor and insignificant differences between the orthodontic and control groups. T. M. Graber
Modular
Orthodontics
William L. and Robert C. Wilson Denver,
1981,
Rocky
Mountain
Orthodontics.
I74 pages,
illustrated.
Price,
$59.50
This well-illustrated, practical, case-bound manual is a presentation of concepts and actual mechanotherapy of a technique developed in the past 10 years by the senior author. After a discussion of modular orthodontic concepts in the foreword, the balance of the manual is divided into five parts. Part 1, ‘ ‘Treatment Applications, ’ ’ discusses rapid molar and bicuspid distalization, rapid anterior intrusion and advancement, and multiple mandibular anchorage. Part 2 presents and describes the modular orthodontic components, such as the bimetric distalizing arch, 3D lingual arch, 3D sectional arch, and 3D lingual tube. A special section is written to acquaint auxiliary personnel with information that might be helpful in supporting the orthodontist. Part 3 has additional discussions and illustrations of bimetric distalizing arch treatment for various malocclusion categories. Also covered are additional aspects of 3D lingual arch treatment. Part 4, called “Modular Functional Treatment, ” is presented as a fixed appliance alternative to removable functional appliances. Part 5 consists of a summary, a quick reference guide, and a materials list. The quality of book production is high, with excellent line drawings particularly. It satisfies its original purpose well-to present an explicit “how to” reference for the use of modules. T. M. Graber
Thesis abstracts An Analysis
of Response
Following
Mandibular
Advancement
Surgery
Ronald L. Champion University
of the Pacijic,
San Francisco,
1981
Lateral cephalometric landmarks were evaluated for change, before and after surgery, in a study of twenty-one mandibular-advancement cases. The surgical technique for advancement was limited to either sag&al split ramus osteotomy, or C osteotomy. The mean postsurgical interval was 22 months. The wide range of individual variation resulted in large standard deviations which precluded definitive conclusions. However, a number of mean changes were consistent with recent findings from similar investigations. Traction via the surgical splint had an orthodontic effect upon the maxillary dentition. Postsurgical return of the mandible occurred (x = 30 percent). However, the net gain was
substantial (% = 5.5 mm.). As a result of adjustment in gonion position. the posterior facial height decreased and the mandibular plane angle increased. The increase observed in anterior facial height was negligible. The hyoid bone returned toward, but did not reach, its presurgical position. The distance between the hyoid bone and mention increased, which supports other findings of adaptation within the suprahyoid muscle group.
The Effect of Retraction Lip Position Craig T. Holdaway Univrrsity of the Pacific,
of Maxillary
San Francisco,
Anterior
Teeth Upon
1981
The purpose of this investigation was to determine if a reliable relationship could be established between tooth and lip retraction. The following factors were considered: (1) Age, (2) sex, (3) race, (4) length of study, and (5) lip strain. The sample consisted of pretreatment, posttreatment, and lo-year follow-up cephalograms of thirty-eight patients. The explained variation of lip-to-tooth novement at the retention period was 43 percent. Including a strain factor increased the explained variation to 53 percent. Explained variance increased to 77 percent and 86 percent respectively, when the retention period and retention period plus lip strain factor were considered. The present findings indicate that a reliable relationship between incisor retraction and lip position can be established if retention time and pretreatment lip strain are taken into consideration.
The Relationship EMween Clinical Measurements of the Gingival Tii Mark McDonough University
qf the Pacific.
San Francisco,
I981
The purpose of this study was to determine if color slides of the gingival tissue in the mandibular incisor region accurately represent this tissue clinically. A sample of ten young, ten adolescent, and ten adult patients with varying gingival tissue heights (free gingival margin to mucogingival junction) were selected from the orthodontic clinic at the University of the Pacific School of Dentistry. The following clinical and photographic measurements were performed on each of the thirty subjects on two separate occasions. Clinical measurements 1. Height of the gingival tissue on the midfacial surface of the four mandibular incisors. To measure this height, two methods were used to locate the mocogingival junction. 2. Depth of the gingival sulcus. Photographic
measurements
1. Height of the gingival tissue measured from two color slides, one taken with retractors and one taken without. The clinical and photographic measurements were analyzed and compared.