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Systematic Error: Methodological and Sampling Errors01:15

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The self is a central aspect of human identity, encompassing an individual’s beliefs, emotions, perceptions, and experiences. It is a cognitive and psychological construct that enables individuals to interpret their traits and behaviors, influencing how they perceive themselves and interact with the world. While personality consists of stable and enduring characteristics, the self is shaped by self-perception and social experiences. This distinction highlights the dynamic nature of the...
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Random or indeterminate errors originate from various uncontrollable variables, such as variations in environmental conditions, instrument imperfections, or the inherent variability of the phenomena being measured. Usually, these errors cannot be predicted, estimated, or characterized because their direction and magnitude often vary in magnitude and direction even during consecutive measurements. As a result, they are difficult to eliminate. However, the aggregate effect of these errors can be...
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The margin of error is also called the maximum error of an estimate. The margin of error is the maximum possible or expected difference between the observed sample parameter value and the actual population parameter value. For proportion, it is the maximum difference between the value of sample proportion obtained from the data and the true value of population proportion. As the true value of the population parameter is not known, the margin of error is calculated using the sample statistic.
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Memory is the retention of information or experiences over time, facilitated through three main processes: encoding, storage, and retrieval. Encoding is the process of inputting information into the memory system. For instance, when listening to a lecture, watching a play, reading a book, or having a conversation, the brain is actively encoding information. This initial stage involves transforming sensory input into a form that can be processed and stored by the brain. Various factors, such as...
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Understanding Predictability Error in Orthognathic Surgery.

Edlyn Rodrigues1, Vikas Dhupar1, Francis Akkara1

  • 1Department of Oral and Maxillofacial Surgery, Goa Dental College and Hospital, Bambolim, Goa 403-202 India.

Journal of Maxillofacial and Oral Surgery
|August 3, 2019
PubMed
Summary
This summary is machine-generated.

Orthognathic surgery planning using 2D cephalometric tracings and mock surgery accurately predicts jaw movements. This method ensures predictable outcomes for improving facial aesthetics and function.

Keywords:
Bijaw surgeryBilateral sagittal split osteotomyHard tissue analysisLateral cephalometryLe Fort I osteotomyPredictability error

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Area of Science:

  • Oral and Maxillofacial Surgery
  • Orthodontics
  • Craniofacial Surgery

Background:

  • Orthognathic surgery enhances facial aesthetics and jaw function.
  • Lateral cephalometry is crucial for pre-operative surgical planning.
  • Mock surgery predicts maxilla and mandible movements.

Purpose of the Study:

  • To evaluate the predictability of orthognathic surgery outcomes.
  • To assess the accuracy of 2D cephalometric planning and mock surgery.

Main Methods:

  • Prospective cohort study of 30 adult orthognathic surgery patients.
  • 2D cephalometric analysis of pre-operative (T1) and post-operative (T2) cephalograms.
  • Comparison of predicted jaw movements with actual hard tissue changes (Point A and B).

Main Results:

  • Statistically insignificant differences between predicted and actual post-operative outcomes (p < 0.001).
  • High predictability of jaw movement based on 2D planning.

Conclusions:

  • Digitized 2D cephalometric tracings and mock surgery enable predictable orthognathic surgery planning.
  • This planning approach leads to reliable results for surgical correction.