A preliminary report on a computer‐assisted dental cast analysis system used for the prosthodontic treatment

Kojima, Tetsuya; Sohmura, Taiji; Nagao, M.; Wakabayashi, Keiji; Nakamura, Takashi; Takahashi, Junzô

doi:10.1046/j.1365-2842.2003.01095.x

Cited by 6 publications

(10 citation statements)

References 12 publications

(9 reference statements)

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“…However, in the case of dentitions with malocclusion, the occlusal plane is imprecise as a reference because dentition often shows abnormal positioning. Hence, in our previous study, we proposed a new reference coordinate system using the top of bilateral maxillary tubercles and incisive papilla (11).…”

Section: Discussionmentioning

confidence: 99%

“…In order to analyse maxillary and mandibular casts with intercuspal position, an intercuspal bite block was taken using vinyl‐silicone bite material (Exabite) ‡ . Initially, a maxillary cast was measured, the intercuspal bite block placed precisely on the maxillary casts, and measured instead of the mandibular cast (11).…”

Section: Measuring Methodsmentioning

confidence: 99%

“…On the contrary, patients with malocclusion often have an abnormal positioning of anterior and posterior teeth, and it is difficult to establish the occlusal plane or the reference coordinate using dentition landmarks. Accordingly, in our previous study, a new reference coordinate system was proposed using the top of bilateral maxillary tubercles and incisive papilla (11). This coordinate system was found useful to analyse dental casts with malocclusion.…”

Section: Introductionmentioning

confidence: 99%

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Computer‐assisted morphological analysis of dental casts with maxillary prognathism and reversed occlusion

Kojima

Sohmura

Wakabayashi

et al. 2004

J of Oral Rehabilitation

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The morphologic characteristics of the dentition with maxillary prognathism and reversed occlusion were examined by a computer-assisted dental cast analysing system. Dental casts with normal occlusion, maxillary prognathism and reversed occlusion were selected and measured by a 3D shape measuring system. The dental arches and anteroposterior occlusal curves were approximated numerically by the polynomial expression with a fourth order and second order coefficients, respectively. The coefficients were analysed statistically. Maxillary dental arches with mandibular prognathism showed a more acuminate shape (V-shape) with a significant larger second order coefficient, while arches with reversed occlusion showed more angulate shapes (U-shape) with significantly smaller second order coefficients compared with arches with normal occlusions. However, a notable difference in the shape of the mandibular dental arches was not observed. The mandibular dental arches with maxillary prognathism were positioned backward relative to maxillary dental arches, while the arches with reversed occlusion were positioned forward. The anteroposterior occlusal curves with maxillary prognathism showed larger curvatures in maxilla and mandible, while the curves with reversed occlusion showed smaller curvatures in mandible comparing with the curves with normal occlusion. These results suggest that the present method could offer a useful and objective examination technique for the diagnosis of malocclusion.

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Section: Discussionmentioning

confidence: 99%

Section: Measuring Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Computer‐assisted morphological analysis of dental casts with maxillary prognathism and reversed occlusion

Kojima

Sohmura

Wakabayashi

et al. 2004

J of Oral Rehabilitation

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“…In previous reports on occlusion diagnosis, bite impressions of patients were measured using optical scanners [10][11][12] . In those reports [10][11][12] , it was necessary to scan multiple times and the measurement procedure was complicated with the possibility of error accumulation.…”

Section: Introductionmentioning

confidence: 99%

“…In those reports [10][11][12] , it was necessary to scan multiple times and the measurement procedure was complicated with the possibility of error accumulation. As for the microfocus X-ray CT scanner, it has the advantage of capturing the precise 3D shapes of upper and lower dental casts together with the interocclusal record.…”

Section: Introductionmentioning

confidence: 99%

3D Morphological Measurements of Dental Casts with Occlusal Relationship using Microfocus X-ray CT

Kamegawa¹,

Nakamura²,

Tsutsumi

2008

Dent. Mater. J.

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In the diagnosis of dental occlusion, it is necessary to quantitatively measure interocclusal contacts and transfer them to a computer model. In this aspect, three-dimensional computer models of upper and lower dental casts play a significant role. In this study, we proposed a new method to measure occlusal interaction by using a microfocus X-ray CT technique. Measurement accuracy was determined as ±0.03 mm in comparison with a coordinate measuring machine. A superimposition procedure for two sets of three-dimensional dental cast models was also established. Using the same dental cast, the standard deviation between the two sets of models was ±0.015 mm -which was defined as measurement precision. Between an optical laser scanner and the microfocus X-ray CT system, the standard deviation measured between the two models was ±0.05 mm. Data were acquired when upper and lower dental casts mounted on the bite impression were scanned, and then occlusal interaction, contacts, and distance distribution between the casts were visualized by a colored map on the cast models. Within the limitations of the current study, it was successfully demonstrated that microfocus Xray CT was well poised for quantitative measurement of occlusal interaction.

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Predicting first molar width using virtual models of dental arches

et al. 2007

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In dentistry, large regions of dentition often are restored with minimal information about the original anatomy. The ability to predict missing anatomy from existing anatomy would aid such restorations. This study investigated the relationship between first molar mesial-distal width and arch shape using newly defined reference points and three-dimensional (3D) digital methods. Full-mouth dental stone casts from 167 dental students were scanned and rendered as 3D virtual models. Maxillary and mandibular arch lengths and widths and first molar mesial-distal widths were measured on the virtual models using new definitions incorporating virtual planes. A linear mixed model of the first molar width regressed on the other measurements was done. Intraobserver reproducibility was evaluated by means of intraclass correlation (ICC) and standard deviation of measurement error (SDME). All measured distances were averaged as a combined group and as gender groups. The correlation coefficients between the maxillary and mandibular first molar widths were over 0.70 (P < 0.01). Intraobserver error was small. ICCs were over 0.92 and SDMEs were from 0.11 to 0.21 mm. Arch dimensions and first molar widths were defined and measured. Regression equations were calculated for predicting first molar width. The prediction of first molar width using arch dimension is essential for virtual designing of missing first molars. This approach also provides reliable reference point definitions for the virtual dental model which was impossible with traditional measurement methods. Therefore, this study would be helpful for understanding the 3D anatomy of dental arch and fabrication of automatic prosthodontic restorations.

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A preliminary report on a computer‐assisted dental cast analysis system used for the prosthodontic treatment

Cited by 6 publications

References 12 publications

Computer‐assisted morphological analysis of dental casts with maxillary prognathism and reversed occlusion

Computer‐assisted morphological analysis of dental casts with maxillary prognathism and reversed occlusion

3D Morphological Measurements of Dental Casts with Occlusal Relationship using Microfocus X-ray CT

Predicting first molar width using virtual models of dental arches

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