Reliability of a digital image method for measuring medial mandibular flexure in dentate subjects

Shinkai, Rosemary Sadami Arai; Canabarro, Simone de Andrade; Schmidt, Caroline Bom; Sartori, Evandro Afonso

doi:10.1590/s1678-77572004000400020

Cited by 18 publications

(30 citation statements)

References 22 publications

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“…The same procedure was carried out three times and a mean width of the dental arch in each position was obtained. MMF in maximum opening (MMFO) and protrusion (MMFP) were calculated by subtracting the width of the respective arch from the value obtained at the resting position 22,23 .…”

Section: Methodsmentioning

confidence: 99%

“…However, an integrated analysis of the jaw muscles and their effects on functional response with regard to craniofacial morphology has never been conducted in a homogeneous population. Additionally, previous studies 22,23 have evaluated the maximal occlusal force using thicker sensor pads, which lead to a greater distance between antagonistic teeth. The results may therefore not be reliable.…”

Section: Introductionmentioning

confidence: 99%

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Occlusal force, electromyographic activity of masticatory muscles and mandibular flexure of subjects with different facial types

et al. 2011

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ObjectiveThe aim of this study was to evaluate whether vertical facial patterns influence maximal occlusal force (MOF), masticatory muscle electromyographic (EMG) activity, and medial mandibular flexure (MMF).Material and MethodsSeventy-eight dentate subjects were divided into 3 groups by Ricketts's analysis: brachyfacial, mesofacial and dolychofacial. Maximum occlusal force in the molar region was bilaterally measured with a force transducer. The electromyographic activities of the masseter and anterior temporal muscles were recorded during maximal voluntary clenching. Medial mandibular flexure was calculated by subtracting the intermolar distance of maximum opening or protrusion from the distance in the rest position. The data were analyzed using ANOVA followed by Tukey's HSD test. The significance level was set at 5%.ResultsData on maximum occlusal force showed that shorter faces had higher occlusal forces (P<0.0001). Brachyfacial subjects presented higher levels of masseter electromyographic activity and medial mandibular flexure, followed by the mesofacial and dolychofacial groups. Additionally, dolychofacial subjects showed significantly lower electromyographic temporalis activities (P<0.05).ConclusionWithin the limitations of the study, it may be concluded that maximum occlusal force, masticatory muscle activity and medial mandibular flexure were influenced by the vertical facial pattern.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Occlusal force, electromyographic activity of masticatory muscles and mandibular flexure of subjects with different facial types

et al. 2011

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“…A single calibrated examiner, who was blind to occlusal force values and cephalometric data, performed all linear measurements and MMF calculations. Reliability tests of this method yielded intra-rater intraclass correlation coefficients (ICC) from 0.98 to 0.99, inter-rater ICC of 0.69 [17], and test-retest ICCs from 0.96 to 0.99 [14]. …”

Section: Methodsmentioning

confidence: 99%

Maximum occlusal force and medial mandibular flexure in relation to vertical facial pattern: a cross-sectional study

et al. 2007

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BackgroundVertical facial pattern may be related to the direction of pull of the masticatory muscles, yet its effect on occlusal force and elastic deformation of the mandible still is unclear. This study tested whether the variation in vertical facial pattern is related to the variation in maximum occlusal force (MOF) and medial mandibular flexure (MMF) in 51 fully-dentate adults.MethodsData from cephalometric analysis according to the method of Ricketts were used to divide the subjects into three groups: Dolichofacial (n = 6), Mesofacial (n = 10) and Brachyfacial (n = 35). Bilateral MOF was measured using a cross-arch force transducer placed in the first molar region. For MMF, impressions of the mandibular occlusal surface were made in rest (R) and in maximum opening (O) positions. The impressions were scanned, and reference points were selected on the occlusal surface of the contralateral first molars. MMF was calculated by subtracting the intermolar distance in O from the intermolar distance in R. Data were analysed by ANCOVA (fixed factors: facial pattern, sex; covariate: body mass index (BMI); alpha = 0.05).ResultsNo significant difference of MOF or MMF was found among the three facial patterns (P = 0.62 and P = 0.72, respectively). BMI was not a significant covariate for MOF or MMF (P > 0.05). Sex was a significant factor only for MOF (P = 0.007); males had higher MOF values than females.ConclusionThese results suggest that MOF and MMF did not vary as a function of vertical facial pattern in this Brazilian sample.

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“…The accuracy of the digital measurement methods has been examined in previous studies. As expected, the intraobserver reliability (intraclass correlation coefficient: 0.98) is more accurate than interobserver examination (0.69 and 0.65) [Shinkai et al, 2004;Rawlinson et al, 2005]. In this study, the Adobe Photoshop 7 was used to analyze the digital images.…”

Section: Discussionmentioning

confidence: 76%

“…Digital CT and X-ray images or histological sections are frequently used to quantify the amount of bone formation [Mohr et al, 2003;Shinkai et al, 2004;Rawlinson et al, 2005] Image Solutions IMSOL, Standish, Wigan (UK), Image Science Software, Berlin (Germany) and Imagic Bildverarbeitung, Glattbrugg (Switzerland)]. The accuracy of the digital measurement methods has been examined in previous studies.…”

Section: Discussionmentioning

confidence: 99%

Digital Measurements: A Different Approach to Evaluate Bone Formation

Gordjestani¹,

Dermaut²,

Ridder

et al. 2006

Cells Tissues Organs

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In this study a digital measurement technique has been proposed to quantify bone formation on histological images. Two standard parietal defects were created in 30 adult rabbits. The animals were divided into six groups. Four animals of each group were randomly chosen as experimental group in which osteopontin-coated hydroxyapatite (OPN-HA) and hydroxyapatite (HA) were inserted alternatively in created defects. To observe the spontaneous healing process of defects, one animal of each group was used as control animal and these created defects did not receive any implants. The animals were sacrificed after 1, 2, 6, 12, 18 and 30 weeks. The histological sections were magnified (×100) and scanned digitally. The newly formed bone surfaces within the healing area were indicated and quantified by means of Adobe Photoshop® 7 software. This measuring technique was found to be reliable and reproducible. The results of this study show no significant differences in bone formation between the OPN-HA and non-coated HA defects, although a significant difference in bone formation was measured at the margins of the defects treated with OPN-HA.

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Reliability of a digital image method for measuring medial mandibular flexure in dentate subjects

Abstract: The present results show excellent intra-rater and good inter-rater reliability of this digital image method for measuring MMF in dentate subjects.

Cited by 18 publications

References 22 publications

Occlusal force, electromyographic activity of masticatory muscles and mandibular flexure of subjects with different facial types

Occlusal force, electromyographic activity of masticatory muscles and mandibular flexure of subjects with different facial types

Maximum occlusal force and medial mandibular flexure in relation to vertical facial pattern: a cross-sectional study

Digital Measurements: A Different Approach to Evaluate Bone Formation

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