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Biomedical subjects

A G McCollum

Publications and source records attributed to A G McCollum.

6 recordsLinked to original sources
PubMed1998

Binder syndrome: literature review and long-term follow-up on two cases.

Binder syndrome has a characteristic clinical appearance including midface hypoplasia, flattened nose, convex upper lip, broad philtrum, crescent-shaped nostrils, and a deep fold or fossa between nose and upper lip. The incisors may be in crossbite with overangulation of the maxillary incisors, and a Class III occlusion is common. Radiographic features include small or absent anterior nasal spine, thin labial plate over incisor roots, nasomaxillary hypoplasia, and skeletal Class III relation. This article reviews the literature in reference to Binder syndrome and presents two patients treated by two different techniques with long-term follow-up. The first patient was treated with traditional orthognathic procedures, whereas the second was treated with a growth-center implant to the nose and orthodontics to treat the occlusion.

Adolescent↗
PubMed1989

An alternative for the correction of the Class II low mandibular plane angle.

The traditional orthodontic and/or orthognathic surgical management of the Class II deep-bite case with a low mandibular plane angle has often been difficult; optimal esthetic results have not always been achieved, and long-term stability was often unpredictable. Many of these patients may benefit functionally and esthetically from appropriate orthodontic treatment and double-jaw surgical intervention to reorient the occlusal plane toward normal (8 degrees +/- 5 degrees to Frankfort horizontal) by moving the posterior maxilla and mandible superiorly and correcting into a Class I skeletal and occlusal relationship. As the occlusal plane angulation is increased, the upper incisor angulation decreases, the lower incisor angulation increases, the chin rotates down and backward relative to the lower incisor occlusal plane tips, and the mandibular plane angle increases. The principle of changing the occlusal plane has provided a means to improve the functional and esthetic results for the correction of this type of facial deformity, as well as many others.

Adolescent↗
PubMed1980

Maxillary canine retraction, periodontal surgery, and relapse.

Extraction spaces closed during the course of orthodontic therapy tend to re-open, whereas orthodontically rotated teeth are prone to relapse. One of the major causes of spaces opening between teeth is the supra-alveolar soft tissues which do not always adapt to the new tooth positions. Seven patients requiring extraction of upper first premolar teeth as part of their orthodontic treatment were selected for this study. Tattoo marks were placed in the attached gingivae close to the upper canine teeth. The canines were then retracted orthodontically across the extraction spaces. The left side was designated the control side and the right side the experimental side. Immediately after completion of retraction, the attached gingiva was surgically detached from the canine teeth on the experimental sides. The canines on both sides were retained in their new positions for 8 weeks following space closure. The amount of relapse or recoil of the gingivae was measured. In this study the gross gingival changes were similar to those described by Atherton and Kerr, Atherton, Edwards. The tattoo marks moved distally with the retracted canines. The amount of gingival movement was similar on both experimental and control sides and ranged between 49.4 percent and 82.4 percent of the retraction distance. Very little recoil or relapse of the gingivae occurred following surgical detachment from the canines. The results of this study indicate that the gingivae appear to adapt to the new tooth position and that relapse of canines retracted across extraction sites in the maxilla is not necessarily caused by the supra-alveolar soft tissues.

Adolescent↗