PubMed · 9109590
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D L Leever. 1997. Sunrise--sunset.. https://doi.org/10.1016/s0889-5406(97)80028-5
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The aim of this study is to identify the diagnostic criteria for pseudo-Class III malocclusion and compare it with Class I malocclusion in the southern Chinese population. Sixty-seven patients (mean age, 10.9 +/- 1.8 years) were included in this study; 36 patients represented pseudo-Class III malocclusion. Selection criteria included the following: (1) anterior crossbite (at least 2 incisors with negative overjet and overbite); (2) mandibular displacement; (3) all patients were southern Chinese who had been followed after the growth spurt, none had developed a skeletal Class III malocclusion; (4) the patients were treated for an average of 7 months to procline upper incisors and retrocline lower incisors. None of the cases received any treatment that might affect skeletal growth. Thirty-one patients with Class I malocclusion were included in the Class I malocclusion group for the comparison of dentoskeletal characteristics with the pseudo-Class III malocclusion group. Selection criteria included the following: (1) skeletal Class I malocclusion with normal overjet and overbite, (2) mild to moderate crowding with Class I molar relationship, (3) straight facial profile. The following were included in the assessment of pseudo-Class III malocclusion cases: (1) family history, (2) molar and canine relationships at habitual occlusion and centric relation, and (3) dentoskeletal morphology. The results were that 72% of the examined cases in the pseudo-Class III malocclusion group showed no family history and 75% showed Class I molar relationship at habitual occlusion. Compared with the Class I malocclusion group, subjects in the pseudo-Class III malocclusion group showed a significantly decreased midface length, increased maxillary-mandibular difference, more retroclined upper incisors, and a retrusive upper lip. In conclusion, a pseudo-Class III malocclusion is characterized by retroclined upper incisors, retrusive upper lip, decreased midface length, and increased maxillary-mandibular difference. Findings of this study showed that patients with a pseudo-Class III malocclusion exhibit certain morphologic, dental, and skeletal characteristics that should be of aid in the diagnosis of pseudo-Class III malocclusion.
STATEMENT OF PROBLEM: An inordinate amount of time is often required to adjust the occlusion of a newly fabricated crown. PURPOSE: This study determined whether the procedure of "cast adjustment" significantly decreases the time necessary to clinically adjust the occlusion of a newly fabricated crown. MATERIAL AND METHODS: Thirty-eight crowns were fabricated by a commercial dental laboratory for patients of senior dental students at the University of the Pacific School of Dentistry. After master casts were returned from the laboratory and then mounted on semiadjustable articulators by the students, the cases were divided randomly into 2 groups: (1) the control group, for which no further work was performed before fabrication of the restoration; and (2) the experimental group, in which casts were occlusally adjusted by a certified laboratory technician until there was at least 1 cusp tip to flat surface centric contact on each posterior tooth in maximum intercuspation position. After the crowns were delivered, the students filled out a survey. One question on the survey asked the student for the time required to adjust the occlusion on the crown. RESULTS: Of the 19 crowns in the control group, 6 crowns required more than 1 hour for occlusal adjustment. Of the 19 crowns in the experimental group, 1 crown required more than 1 hour for occlusal adjustment. CONCLUSION: Performing a "cast adjustment" before fabricating a single unit casting can significantly decrease the chance of a lengthy clinical occlusal adjustment.
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