Changes in lip forms on three-dimensional images with alteration of lip support and/or occlusal vertical dimension in complete denture wearers

Ushijima, Masao; Kamashita, Yuji; Nishi, Yasuhiro; Nagaoka, Eiichi

doi:10.1016/j.jpor.2012.11.003

Cited by 14 publications

(4 citation statements)

References 11 publications

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“…In a follow-up study, the same group evaluated changes in lip forms with alteration of lip support and/or occlusal vertical dimension using experimental record blocks 20 . Ten edentulous subjects, aged 51 -81 years participated in this study.…”

Section: Esthetic Effects Of Increasing Occlusal Vertical Dimensionmentioning

confidence: 99%

Effect of occlusal vertical dimension on lip positions at smile

Chou¹,

Thompson²,

Aggarwal³

et al. 2014

The Journal of Prosthetic Dentistry

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Purpose:In full mouth reconstructive dentistry, the occlusal vertical dimension(OVD) is often increased to provide adequate restorative space or for esthetic reasons. The purpose of this study was to analyze the effect of occlusal vertical dimension on dimensional measurements of the smile. Materials and Methods:30 dental students, 12 male and 18 female between the ages of 21 -30 participated in this study. Polyvinyl Siloxane bite splints of 2mm, 4mm, 6mm, 8mm thicknesses were fabricated on stone casts mounted on semi-adjustable articulators. A wall-mounted head positioning device, modified from a cephalometric unit was used to stabilize head positions. Three photographs each at OVD of +0mm, +2mm, +4mm, +6mm, +8mm were taken using a DSLR camera mounted on a tripod. Measurements were made in Adobe Photoshop CS5, using the width of the maxillary central incisors to convert pixel measurements to millimeter measurements. Results:One way repeated measures ANOVA found statistically significant differences in interlabial gap height, incisal edge -lower lip length, and display zone area with increasing OVD. No statistically significant differences were found for intercommisural width and incisal edge -upper lip length. Conclusions:This study demonstrates that excessive increase of OVD may lead to excessive interlabial gap height, incisal edge -lower lip length, and display zone area. A lengthening of the upper lip at smile should not be expected with increasing OVD. In addition, a change in the width of the smile should not be expected with increasing OVD. i ACKNOWLEDGEMENTS

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Section: Esthetic Effects Of Increasing Occlusal Vertical Dimensionmentioning

confidence: 99%

Effect of occlusal vertical dimension on lip positions at smile

Chou¹,

Thompson²,

Aggarwal³

et al. 2014

The Journal of Prosthetic Dentistry

View full text Add to dashboard Cite

show abstract

“…These results are in accordance with the other studies in the literature, in which a larger displacement of upper and lower lips after inserting a complete denture was encountered. 11,12 However from a clinical perspective, anterior positioning of the upper and lower lips was more pronounced in L1 than in L2. This result may be related to the fact that, the mandibular anterior teeth were placed more lingually in the neutral zone technique records, while the maxillary anterior teeth were placed closer to the position of the natural anterior teeth, as reported in a study.…”

Section: Discussionmentioning

confidence: 95%

Comparing Facial Esthetic and Volumetric Changes of an Edentulous Patient After Either Conventional or Neutral Zone Technique

KALYONCUOĞLU,

BAYSAL,

ATİK

2023

Cumhuriyet Dental Journal

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The aim of the present case report was to compare the soft tissue measurements, volumetric differences on face of the patient whose complete dentures were fabricated either with conventional or neutral zone impression techniques. Two different complete dentures were fabricated according to conventional and neutral zone impression techniques. The measurement of soft tissue changes was evaluated on lateral cephalograms; conventional technique (L1), neutral zone technique (L2) and with no dentures (L3). Three images (I) were taken on the same day respectively with dentures completed by conventional technique (I1), dentures completed by neutral zone technique (I2), and with no dentures (I3). Superimposition of the images were evaluated. The cephalometric soft tissue measurements of the present case showed that upper and lower lips were positioned anteriorly in both conventional (L1) and neutral zone techniques (L2) on sagittal plane. These results could be attributed to the fact that the placement of the prosthesis in mouth helps directing lip position with big linear measurements. Volumetric difference between conventional (I1) and no denture (I3) images was more pronounced compared to neutral zone (I2) superposition with no denture (I3).

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“…The similar tendency of the upper lips to change after wearing the traditional removable complete dentures has been reported [ 5 ]. The reason why the soft tissue marks moved vertically and forwardly was that after denture wearing, the lower third of the facial height increased and the contact force and the tension of soft tissue changed, which influenced the shape and contour of the lips [ 33 ].…”

Section: Discussionmentioning

confidence: 99%

Morphometry and displacement analysis of the upper lips following maxillary full-arch implant-supported fixed prostheses: a 3D morphometric study

Hao

Luo

et al. 2021

BMC Oral Health

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Background With the emergence of three-dimensional (3D) integration technology, analysis of soft tissue displacement and morphological changes after maxillary full-arch implant-supported fixed prostheses can be performed. The aim of this study was to verify the feasibility of the 3D integration method for constructing the relative position of the prostheses and facial soft tissue, evaluate the displacement and morphological variation of the upper lips after maxillary full-arch implant-supported fixed prostheses. Methods Twenty-five maxillary edentulous patients were recruited in this study. At the time of final prosthesis delivery, the 3D prostheses data and three 3D facial profiles were integrated. After method validation, the 3D position changes of seven soft tissue landmarks were used to reflect the 25 upper lips. The variation of four morphological distances were analyzed to reflect the morphological alteration of the upper lips. Two pairs of dentofacial landmarks were used to analyze the sagittal relative position of the prostheses and soft tissue. The included patients were also grouped to determine the impact of sex, upper lip thickness, and length on lip support changes. Results The average distance of the two matched relative reliable forehead regions was only 0.32 mm. The sagittal shifts of labrale superius (LS), stomion (STO), crista philtri left (CPHL) and crista philtri right (CPHR) were 3.44 ± 1.39 mm, 2.52 ± 1.38 mm, 3.04 ± 1.18 mm, and 3.12 ± 1.21 mm, respectively. With the exception of the decrease in the length of subnasale (SN)-LS, the length of cheilion right (CHR)-cheilion left (CHL), CPHR-CPHL, and LS-STO significantly increased. The two pairs of dentofacial landmarks had strong positive movement correlations along the sagittal direction. Patients with thinner and longer lips showed more lip support than those with thicker and shorter lips by a clinically insignificant amount. Conclusions The integration method of 3D facial and dental data showed high repeatability in constructing the dentofacial relative position. The linear equations reflecting dentofacial relative position could aid clinicians in evaluating the restoration effect and estimate the upper lip variation.

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Changes in lip forms on three-dimensional images with alteration of lip support and/or occlusal vertical dimension in complete denture wearers

Abstract: Deficient OVD with extensive lip support can curve the oral fissure form upward, and deficient OVD with deficient lip support can reduce the vermilion height.

Cited by 14 publications

References 11 publications

Effect of occlusal vertical dimension on lip positions at smile

Effect of occlusal vertical dimension on lip positions at smile

Comparing Facial Esthetic and Volumetric Changes of an Edentulous Patient After Either Conventional or Neutral Zone Technique

Morphometry and displacement analysis of the upper lips following maxillary full-arch implant-supported fixed prostheses: a 3D morphometric study

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