Introduction: The objective of this study was to determine if there was any significant difference in treatment time or results due to varying levels of attending doctor coverage in the Loma Linda University (LLU) graduate orthodontics clinic. Methods and Materials: The main study group of 191 subjects was split into high, medium and low coverage groups by primary attending doctor coverage and then by original attending doctor coverage. Treatment times, treatment results, and other variables were evaluated for each of the groups. Treatment results were evaluated using UK Peer Assessment Rating (PAR) scores. A second study group (289 subjects) included an additional 98 subjects who met all of the inclusion criteria but lacked PAR scores. Statistical tests included one-way ANOVA and Pearson Correlation. Results: No statistically significant differences were found in treatment time (P ≥0.128) or results (P ≥0.052). There were no statistically significant differences in the mean scores for T1 PAR (P ≥0.056), T2 PAR (P ≥0.602), patient age at T1 (P ≥0.747), total appointments (P ≥0.128), missed appointments (P ≥0.050), or cancelled appointments (P ≥0.183). When the main subject group was divided into thirds by T1 PAR (low, medium, and high T1 PAR), there were statistically significant differences in percent change in PAR (P =0.000), treatment time (P =0.008), and the percent of primary attending coverage (P =0.001) between the low T1 PAR and the medium T1 PAR groups as well as between the low T1 PAR and high T1 PAR groups. In the second study group (n =289), T1 PAR was weakly correlated with treatment time (r=0.280) and with appointment number (r =0.248). Treatment time was strongly correlated with the number of appointments (r =0.822), and moderately correlated with missed appointments (r =0.333). Subjects who had treatment involving the extraction of permanent teeth had longer treatment times (P =0.003), but had no statistically significant differences in results (as measured by percent change in PAR score) (P =0.454). Conclusions: This study shows that variation in attending doctor coverage in the LLU graduate orthodontic clinic does not lengthen time of orthodontic treatment or reduce the quality of treatment results.

LLU Discipline

Orthodontics and Dentofacial Orthopedics


Orthodontics and Dentofacial Orthopedics


School of Dentistry

First Advisor

Leggitt, V. Leroy

Second Advisor

Caruso, Joseph

Third Advisor

Neufeld, Roland

Degree Name

Master of Science (MS)

Degree Level


Year Degree Awarded

January 2013

Date (Title Page)




Library of Congress/MESH Subject Headings

Orthodontics, Corrective; Delivery of Health Care; Primary Health Care; Dentists

Subject - Local

Continuity of care



Page Count

49 p.

Digital Format


Digital Publisher

Loma Linda University Libraries

Usage Rights

This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights.


Loma Linda University Electronic Theses & Dissertations

Collection Website



Loma Linda University. Del E. Webb Memorial Library. University Archives