Objective: The purposes of this study were to evaluate the relationship between the dental and basal arch forms; to analyze their differences in the tapered, ovoid, and square arch forms in normal occlusion by using three-dimensional (3D) virtual models; and to test the hypothesis that the overjet a...
Objective: The purposes of this study were to evaluate the relationship between the dental and basal arch forms; to analyze their differences in the tapered, ovoid, and square arch forms in normal occlusion by using three-dimensional (3D) virtual models; and to test the hypothesis that the overjet and maxillomandibular basal arch width difference have a significantly positive correlation. Methods: Seventy-seven normal occlusion plaster casts were examined by 3D scanning. Facial axis (FA) and WALA points were digitized using the Rapidform 2006 software. The dimensions of the dental and basal arches and the overjet were measured. The samples were classified into 3 groups according to arch forms: tapered (n = 20), ovoid (n = 20), and square (n = 37). Analysis of variance (ANOVA) was used to compare the dental and basal arch dimensions. The Pearson correlation coefficients between the intercanine as well as the intermolar widths at the FA and WALA points were calculated. Results: With regard to the basal arch dimensions, the tapered arch form showed a larger mandibular intermolar depth than the ovoid. Strong correlations were noted between the basal and dental intermolar widths in both the upper and lower arches (r = 0.83 and 0.85, respectively). Moderate correlation was found between the upper and lower intercanine widths (r = 0.65 and 0.48, respectively). Conclusions: The 3 dental arch form groups differed only in some dimensions of the skeletal arch. Moderate correlations were found between the basal and dental intercanine widths. These findings suggest that the basal arch may not be a principle factor in determining the dental arch form.
Objective: The purposes of this study were to evaluate the relationship between the dental and basal arch forms; to analyze their differences in the tapered, ovoid, and square arch forms in normal occlusion by using three-dimensional (3D) virtual models; and to test the hypothesis that the overjet and maxillomandibular basal arch width difference have a significantly positive correlation. Methods: Seventy-seven normal occlusion plaster casts were examined by 3D scanning. Facial axis (FA) and WALA points were digitized using the Rapidform 2006 software. The dimensions of the dental and basal arches and the overjet were measured. The samples were classified into 3 groups according to arch forms: tapered (n = 20), ovoid (n = 20), and square (n = 37). Analysis of variance (ANOVA) was used to compare the dental and basal arch dimensions. The Pearson correlation coefficients between the intercanine as well as the intermolar widths at the FA and WALA points were calculated. Results: With regard to the basal arch dimensions, the tapered arch form showed a larger mandibular intermolar depth than the ovoid. Strong correlations were noted between the basal and dental intermolar widths in both the upper and lower arches (r = 0.83 and 0.85, respectively). Moderate correlation was found between the upper and lower intercanine widths (r = 0.65 and 0.48, respectively). Conclusions: The 3 dental arch form groups differed only in some dimensions of the skeletal arch. Moderate correlations were found between the basal and dental intercanine widths. These findings suggest that the basal arch may not be a principle factor in determining the dental arch form.
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문제 정의
The purpose of this study was to evaluate the relationship between the dental and basal arches in an attempt to detemine the limit of expansion of the dental arch for stable treatment results.
These findings highlight the importance of selecting the archwire form that matches the patient’s pretreatment arch from in order to achieve proper coordination between upper and lower arches.
가설 설정
We hypothesized that the overjet and difference in the widths of the maxillomandibular basal arches have a significant positive correlation. The purposes of this study were to evaluate the relationship between the dental and basal arches; to analyze their differences in the tapered, ovoid, and square arch forms of the upper and lower dentitions in normal occlusion, by using 3D virtual models; and to test the postulated hypothesis.
제안 방법
Further research using cone-beam computed tomography to evaluate the dental and basal arch form relationship is necessary to confirm these findings based on the 3D models.
Since analysis using the Chi square test did not reveal any significant association between gender and arch form, the data of the male and female subjects were combined before further analysis. Analysis of variance (ANOVA) was used for comparing the dental and basal arch dimensions independently among the 3 arch form types.
We hypothesized that the overjet and difference in the widths of the maxillomandibular basal arches have a significant positive correlation. The purposes of this study were to evaluate the relationship between the dental and basal arches; to analyze their differences in the tapered, ovoid, and square arch forms of the upper and lower dentitions in normal occlusion, by using 3D virtual models; and to test the postulated hypothesis.
Pearson correlation coefficients were also calculated between at the amount of overjet at canine and the difference in intercanine width between maxillary and mandibular basal arches, and between the amount of overjet at the first molar and the difference in intermolar width between maxillary and mandibular basal arches. These analyses were performed to evaluate the relationship between the dental arch and the basal arch.
대상 데이터
The samples comprised 77 maxillary and mandibular plaster casts obtained from subjects with normal occlusion. The ages of the subjects ranged from 20.
데이터처리
Independent sample t-test was performed to evaluate the difference in the overjet between the right and the left sides, and since there were no statistically significant differences, the data of both sides were combined. The Pearson correlation coefficients between the intercanine and the intermolar widths at the FA and WALA points were calculated.
The Pearson correlation coefficients between the intercanine and the intermolar widths at the FA and WALA points were calculated. Pearson correlation coefficients were also calculated between at the amount of overjet at canine and the difference in intercanine width between maxillary and mandibular basal arches, and between the amount of overjet at the first molar and the difference in intermolar width between maxillary and mandibular basal arches. These analyses were performed to evaluate the relationship between the dental arch and the basal arch.
Independent sample t-test was performed to evaluate the difference in the overjet between the right and the left sides, and since there were no statistically significant differences, the data of both sides were combined. The Pearson correlation coefficients between the intercanine and the intermolar widths at the FA and WALA points were calculated. Pearson correlation coefficients were also calculated between at the amount of overjet at canine and the difference in intercanine width between maxillary and mandibular basal arches, and between the amount of overjet at the first molar and the difference in intermolar width between maxillary and mandibular basal arches.
성능/효과
In this study, a strong correlation between the basal and dental intermolar widths was found in both maxillary and mandibular arches. This finding is consistent with those reported by Ronay et al.
This study revealed significant differences between the arch forms in only some dimensions of the basal arch; these include the upper and lower intermolar width, the lower intermolar depth, and the lower intermolar W/D ratio. However, the 3 arch forms differed significantly in several dimensions of the dental arch.
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