Prosthodontics Lecture Review: Neutral Zone, Occlusal Rims, Denture Refurbishing, Special Trays, and Tooth Setting

Fill-in-the-blank practice flashcards covering prosthodontic principles including the neutral zone, occlusal rims, denture repair/relining/rebasing, special tray design, and tooth arrangement classification.

The region where forces imposed by the tongue directed outward are neutralized by inwardly directed forces originating from the cheeks and lips is known as the __________.

Neutral Zone

Beresin and Schiesser (1976) described the Neutral Zone as an area of __________ where the tongue and cheeks work in harmony.

dead space

Sir Wilford Fish proposed that dentures possess three surfaces: the occlusal surface, the impression surface, and the __________ surface.

polished

The polished surface of a denture can be larger by size than the __________ and impression surfaces combined.

occlusal

In the provided diagram, denture A represents a favorable ridge where the overall size equals the impression surface, whereas denture B shows an unfavorable ridge resulting from excessive __________ of the alveolar ridge.

resorption

As mandibular ridges resorb, the ridge crest can fall below the origin of the __________ muscle, resulting in a fold that necessitates placing anterior dentition further posteriorly.

mentalis

Omitting the second molars ($7$'s) when setting posterior dentition provides more __________ space and avoids placing teeth on the slope of the retromolar pad.

tongue

Denture palates constructed thicker than $2.5\,mm$ can encourage __________ and cause changes to tooth placement during curing.

porosity

Positioning posterior mandibular dentition in an excessively buccal area places masticatory forces down the buccal side of the ridge, inducing a __________ fracture.

stress

To counteract ridge resorption and allow for correct lip contour, the technician places the upper occlusal rim in front of the __________ by up to $9\,mm$ from the center.

incisal papilla

The height of the upper and lower occlusal rims recorded together establishes the __________ Vertical Dimension.

Occlusal

When adjusting the occlusal plane of a maxillary rim, the rim must be aligned to __________ line to establish a correct relationship to the condyle.

Campers

Asking the patient to touch their soft palate with the tip of their tongue while closing the rims together produces the __________ Contact Position.

Retruded

To mark the position of the canines on an occlusal rim, a line is drawn running down the patient's face starting from the inner __________ of the eye.

canthus

The recommended width of an occlusal rim is $5-6\,mm$ in the anterior region and $8-9\,mm$ in the __________ region.

posterior

The correct depth for carving a postdam on a upper occlusal rim is $1-2\,mm$ extending from one __________ notch to the other.

hamular

To prevent premature contacts, the height of the lower baseplate should be adjusted to $\frac{2}{3}$ the height of the __________ pad.

retromolar

A static situation with simultaneous contacts between opposing artificial teeth on both sides of the dental arches in any position is defined as __________ occlusion.

balanced

In 2013, the General Dental Council (GDC) removed the barrier to direct access for dental technicians exclusively for denture __________ without a prescription.

repairs

To help prevent denture breakages, acrylic work should maintain an adequate cross-section thickness of at least $3\,mm$.

3 mm

When bonding acrylic to cobalt-chrome denture frameworks, a resin such as __________-META can be used to improve adhesion.

4

When preparing a broken acrylic denture for repair, a gap of $1-2\,mm$ should be created in the channel for new cold-cure acrylic to flow into.

1-2 mm

Complete dentures have an expected mean life of $4-5$ years, after which bone resorption may alter the mucosal support.

4-5

While relining alters only the fit surface, a denture __________ involves replacing all of the denture base acrylic while retaining the original denture teeth.

rebase

In special tray manufacture, the thickness of the __________ determines whether the resulting impression is mucostatic or mucocompressive.

spacer

Tissue stops on special trays should ideally be spread out as widely as possible, commonly arranged in a __________ formation for optimum stability.

tripod

Tray handles on complete denture special trays can distort the lip and functional __________ during impression taking.

sulcus

Type IV stone is recommended for casting removable partial denture master models due to its superior resistance to __________ during surveying.

abrasion

High expansion dental stone such as Type V compensates for the contraction of acrylic and can reduce palatal border openings by up to $50\%$.

Type V

A selective pressure impression technique is indicated for managing problematic tissue areas such as a displaceable flabby anterior __________ ridge.

maxillary

Studies on digital impression workflows show that patients generally prefer digital impressions due to reduced discomfort, shorter time, and better __________.

taste

In a Class I denture set-up with an ideal skeletal relationship, incisors traditionally have an overjet and overbite of $2\,mm$.

2 mm

A skeletal Class II jaw relationship requires a non-anatomic occlusal scheme due to the patient's large envelope of __________.

motion

When setting mandibular anterior teeth for a Class II patient with reduced space, an aesthetic option is to omit the first premolars and substitute them with mandibular __________.

canines

In a Class III denture set-up with a crossbite, the __________ cusps of the upper posterior teeth occlude with the central fossae of the lower teeth.

buccal

In severe Class III cases, placing the lower anterior teeth slightly __________ to the upper teeth allows pressure directed down through the lower anteriors to target the lower ridge.

anterior

The anteroposterior curve that touches all the buccal cusps of the lower teeth and extends backwards through the condyle head is called the Curve of __________.

Spee

The lateral curve with an upward facing concavity that maintains cusp contact during working side movements is known as the Curve of __________.

Monson

In complete denture artificial occlusions, single-point contacts established in the Intercuspal Position (ICP) should coincide with __________ relation.

centric

Over time in an edentulous mouth, the Neutral Zone will narrow due to growth of the tongue and a 'falling in' of the __________.

cheeks