Inclusion Criteria:  Malocclusion that requires extraction of first maxillary premolars on both sides. No previous reported or observed dental treatment to the teeth to be extracted. No previous reported or observed trauma to the teeth to be extracted. No previous reported or observed orthodontic treatment involving the teeth to be extracted. Free of any systemic disease affecting the dentition.  Exclusion Criteria:  Past or present signs or symptoms of periodontal disease. Past or present signs or symptoms of bruxism.