Microstomia is a term used to describe a small oral aperture, which is different from micrognathia in which patients have small jaws. The term microstomia may be better defined as any restriction in the range of motion of the mandible, so it is functionally reduced mouth opening. Normal maximum mouth opening ranges from 36-77mm in healthy individual with average value of 40-50mm. Abstract: Stat...

introduction: angle and internal position of lateral pterygoid muscle leads to contraction over two half of the mandible in maximum opening and protrusion position so it can affects impression prosthetic procedures. the aim of this study was to evaluate the mandibular flexure in two transverse and antro-posterior dimensions. methods: seventy edentulous patients at mashhad faculty of dentistry a...

BACKGROUND The aim of this study was to investigate the maximum mouth opening (MMO) in a representative sample of the Saudi adolescents. MATERIALS AND METHODS A total of 1825 Saudi adolescents (1007 males and 818 females) aged 12-16 years were randomly selected. The subjects were asked to open their mouth maximally till no further opening was possible and then the distance from the incisal ed...

BACKGROUND This case report discusses the unusual presentation of limited mouth opening as a result of bilateral coronoid process hyperplasia. CASE PRESENTATION A 14.5-year-old male patient of white Caucasian ethnicity presented with limited mouth opening, mandibular asymmetry, and dental crowding. Investigations confirmed bilateral coronoid process hyperplasia and management involved bilater...

Hydra, a simple freshwater animal famous for its regenerative capabilities, must tear a hole through its epithelial tissue each time it opens its mouth. The feeding response of Hydra has been well-characterized physiologically and is regarded as a classical model system for environmental chemical biology. However, due to a lack of in vivo labeling and imaging tools, the biomechanics of mouth op...

OBJECTIVES The principle of leverage to superpose the convex surfaces of two shells was applied to develop a device for treating limitation of mouth opening and called it the "shell-shaped mouth opener" and analyzed pressure on the teeth with the TheraBite(®) appliance and the shell-shaped mouth opening appliance. MATERIAL AND METHODS To compare the TheraBite(®) appliance and the shell-shaped...

PURPOSE The purpose of this study was to determine whether rotation and translation of the condyle were useful parameters for identifying causes of limitation of mouth opening in patients with temporomandibular disorders (TMD). METHODS In 7 healthy volunteers and 55 patients with TMD, rotation and translation of the condyle were measured using a 6 degree-of-freedom jaw movement tracking devic...

BACKGROUND The authors hypothesized that craniocervical extension occurs during normal mouth opening. METHODS Twenty volunteers were studied. Interdental distance was measured at four different degrees of craniocervical extension. RESULTS Interdental distance increased from 28 mm (95% confidence interval, 25-30) in slight flexion to 46 mm (95% confidence interval, 42-49) at full extension. ...

Mouth opening was measured in 43 children anaesthetized with isoflurane and paralysed with vecuronium or suxamethonium. Measurements of mouth opening were made for up to 10 min after loss of the adductor pollicis twitch and cessation of muscle fasciculations. In 22 patients receiving suxamethonium, a significant (P less than 0.001) reduction in mean mouth opening occurred in the 60 s after loss...