Evidence map›Paper›PMID 17109812›Full record

ReviewArchives of oral biology2007

Developmental and functional considerations of masseter muscle partitioning.

C G Widmer, A W English, J Morris-Wiman

Abstract readReview
In one paragraph

Review in Archives of oral biology, 2007. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 19 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
19citing papers in PubMed, 1 pooled it
0.3field-weighted citation impact, top 42% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

19 citing papers in PubMed, 1 synthesis or guideline pooled it, 51 citations in OpenAlex.

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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

3 authors at 2 institutions in 1 country.

C G WidmerDepartment of Orthodontics, University of Florida, Gainesville, FL 32610-0444, USA. widmer@dental.ufl.edu
A W English
J Morris-Wiman
Emory University · USUniversity of Florida · US

Funding

NERVE-MUSCLE INTERACTIONS DURNIG JAW MUSCLE DEVELOPMENTR01DE012207 · NIDCR · UNIVERSITY OF FLORIDA · PI WIDMER, CHARLES G. · 1998 to 2002
$730k
REGULATION OF MASTICATORY MUSCLE FIBER PHENOTYPER01DE011536 · NIDCR · EMORY UNIVERSITY · PI ENGLISH, ARTHUR W · 1995 to 2002
$719k
FUNCTIONAL ORGANIZATION AND CONTROL OF MASSETERSR01DE010130 · NIDCR · UNIVERSITY OF FLORIDA · PI WIDMER, CHARLES G. · 1991 to 1995
–
NIDCR NIH HHS DE00333NIDCR NIH HHS DE10130NIDCR NIH HHS DE11536NIDCR NIH HHS DE12207
6 · The paper itself

Abstract

The masseter muscle participates in a wide variety of activities including mastication, swallowing and speech. The functional demands for accurate mandibular positioning and generation of forces during incising or a power stroke require a diverse set of forces that are determined by the innate muscle form. The complex internal tendon architecture subdivides the masseter into multiple partitions that can be further subdivided into neuromuscular compartments representing small motor unit territories. Individual masseter compartments have unique biomechanical properties that, when activated individually or in groups, can generate a wide range of sagittal and off-sagittal torques about the temporomandibular joint. The myosin heavy chain (MyHC) fibre-type distribution in the adult masseter is sexually dimorphic and is influenced by hormones such as testosterone. These testosterone-dependent changes cause a phenotype switch from slower to faster fibre-types in the male. The development of the complex organization of the masseter muscle, the MyHC fibre-type message and protein expression, and the formation of endplates appear to be pre-programmed and not under control of the muscle nerve. However, secondary myotube generation and endplate maturation are nerve dependent. The delayed development of the masseter muscle compared with the facial, tongue and jaw-opening muscles may be related to the delayed functional requirements for chewing. In summary, masseter muscle form is pre-programmed prior to birth while muscle fibre contractile characteristics are refined postnatally in response to functional requirements. The motor control mechanisms that are required to coordinate the activation of discrete functional elements of this muscle remain to be determined.

Indexed as

AnimalsBiomechanical PhenomenaHumansMammalsMasseter MuscleMasticationNeuromuscular JunctionSex Characteristics

Identifiers

PMID17109812
PMCPMC1861846
OpenAlexW2063632817

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.