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Articles by C McGrath
Total Records ( 2 ) for C McGrath
  A. K. Y Wu , C McGrath , R. W. K Wong , D Wiechmann and A. B. M. Rabie

The aim of this prospective longitudinal study was to compare pain experiences among Chinese adult patients treated with labial and lingual orthodontic appliances. Sixty patients, 30 with labial appliances (18 females and 12 males, mean age 20.33 years, SD ± 4.205) and 30 with lingual appliances (22 females and 8 males, mean age 21.63 years, SD ± 2.236), rated their overall pain experience on a 100 mm visual analogue scale (VAS) at three time points: 1 week (T1), 1 month (T2), and 3 months (T3) after bracket placement. In addition, on a separate 100 mm VAS, they rated their pain experience at the locations of the tongue, lips, cheeks, gums, face, and jaw at T1, T2, and T3. Changes in pain VAS were conducted using Friedman analysis of variance, area under the curve (AUC) analysis and the data were compared using a t-test.

There was no significant difference in global ratings of pain among those treated with labial or lingual appliances (P > 0.05). Among both groups, global ratings of pain decreased over the study period (P < 0.001). Patients treated with lingual appliances reported higher ratings of tongue pain (P < 0.001), while those treated with labial appliances reported higher ratings of lip (P < 0.001) and cheek (P < 0.001) pain. The findings indicate that patients treated with labial and lingual appliances rate similarly the level of overall pain they experience during treatment. Ratings of overall pain experienced decreased for both treatment groups with time. However, ratings of pain differed at various sites with respect to the type of orthodontic appliance. These findings have implications in informing patients’ treatment decision-making processes regarding labial and lingual appliances and in the management of discomfort associated with different treatment modalities.

  K Bootvong , Z Liu , C McGrath , U Hagg , R. W. K Wong , M Bendeus and S. Yeung

The objective of this study was to assess the feasibility of virtual models as an alternative to orthodontic plaster models. Virtual dental models (obtained from OrthoCAD®) and corresponding plaster models of 80 patients in the permanent dentition were randomly selected from patients seeking orthodontic care. Inter-examiner error was assessed by measuring tooth width, overjet, overbite, intermolar width, intercanine width, and midline discrepancy. Criterion validity of virtual model analysis was determined by the agreement between the measurements from virtual and plaster models. Test–retest reliability was determined by remeasuring 10 virtual models 1 week later. Comparison analysis was assessed by calculating the mean directional differences and standardized directional differences. Correlation analysis was determined by calculating the intraclass correlation coefficients (ICCs).

Both intra- and inter-examiner reliability and test–retest reliability of virtual model analysis were acceptable in measuring intercanine, intermolar, overjet, overbite, midline discrepancy, space analysis, and tooth width (ICC > 0.7). Good criterion validity was indicated by agreement between the results from the plaster and virtual models (ICC > 0.8). There were substantial agreements for canine and molar relationship classifications ( > 0.70). The results suggest that analysis performed on virtual models is as valid as traditional plaster models for intra- and inter-arch relationship.

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