Individual Tray
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Individual Tray
國泰汐止分院 牙科第一年住院醫師 楊舒涵
Object
Improves the accuracy of an elastometric impression by limiting the volume of the material Opposite is true for reversible hydrocolloid
Tray material 1.Autopolymerizing acrylic resin 2.Thermoplastic resin 3.Photopolymerized resin
Autopolymerizing materials
Ostron
Tray resin
Thermoplastic resin Easy Tray: soften in water bath and adapted manually to the spaced cast
Vacuum formed tray: much more thicker and more rigid than those used for make provisional restorations
Light-polymerized materials
Triad VLC resin custom tray material: adapted to the spaced cast
Triad Visible Light Cure System
Outline for relief wax may be drawn on the cast, usually 2 to 3 mm short of tray border
Block out undercuts on the cast with wax or molding compound
Baseplate wax is adapted to the edentulous or partially dentulous cast for tissue relief and trimmed to the desired outline. http://trubyte.dentsply.com/pro/prod_triadcustomtray.shtml
Triad Visible Light Cure System
Paint TRIAD Model Release Agent (MRA)
TRIAD TruTray or Original Blue Tray Material. Carefully adapt it to the cast and trim with a sharp blade
attach a handle by moulding excess material
http://trubyte.dentsply.com/pro/prod_triadcustomtray.shtml
Triad Visible Light Cure System
http://trubyte.dentsply.com/pro/prod_triadcustomtray.shtml
Evaluation
Tray rigidity is important Resin thickness of 2~3mm are needed for adequate rigidity Clearance of tray and the teeth should also be 2~3mm Greater clearance is necessary for the more rigid polyether
Custom tray for FPD
Tray border
On diagnostic cast, using a pencil: approximately 5mm apically to the crest of the free gingiva Maxilla: covering the entire palate is not necessary (but necessary if removable appliance is planned) Posterior border should not extend farther than the junction of hard and soft palate
Space for impression material
Baseplate wax 2.5mm thick, trim wax margin back to pencil line just visible Or dripping cast in molten wax 3~4 times
Stopper placement
Three stops maintain even space for the impression material On non-centric cusp of teeth that will not be prepared If all teeth are involved, use larger soft tissue stop: Crest of alveolar ridge; Center of the hard palate Made by removing wax at an angle of 45 degrees to the occlusal surface
Tray fabrication
Tinfoil on wax prevent melt Gently adapt resin with consistent thickness to the cast Handle made; buccal ridges can also be added After polymerizing, trim with bur
Evaluation
Rigid; thickness 2~3mm
3~5mm cervical to gingival margin
Shaped to allow frenum, muscle attachments
Stable on cast; stoppers maintain impression thickness 2~3 mm
Handle fit between pt's lip
Pressure to prevent lifting while setting
Made 9 hours before using; or 5minutes in boiling water then cool to room temperature
Custom tray for CD
Tray border
Preliminary impression outlined with marker on the preliminary impression or poured cast
impression material and tray
ZOE: close fitting tray
elastomer, alginate: Spaced custom tray
maxillary
provide space : (not used if ZOE as impression material) baseplate wax; 1 mm thick; within outlined border ;posterior seal should not covered by wax spacer
tray: 2-3 mm thick; a stepped handle at anterior region
Premise: all denture-bearing area reflected in the tray's extension
border molding – tray preparation
Wax left when border molding
Space for border molding custom tray reduced to 2mm shorter of the reflections
Tray contains hamular notch and extend 2mm posterior to the vibrating line
Border molding
Record all simultaneously - polyether reduced insertion number avoid errors
Record in sections – stick impression compound
Section: labial =>buccal vestibule=>posterior palatal area
Border molding with polyether Adhesive
留下 wax spacer, 但把靠近 border 的修掉
混 polyether 但 catalyst 少一點
用 syringe 加在 border 和 palatal seal( 用沾水 的手塑型 )
lip 拉高 ,tray 放入
檢查 border 如果材料不夠就用手沾口水把旁 邊的材料移過來
Border molding with polyether(maxillary) @lip 上外下內拉
@frenum 外下內前後拉
@buccal flange 外下內拉
@ 張大嘴 下頷左右動
Setting 後 tray 拿出
檢查 border: 應為 rounded, 小缺陷以 polyether 補 ,tray 的過度延伸會透出 polyether. 應調整
preparing tray for final impression
remove wax , excess material
Buccal frenum 間 , flange 厚不要超過 2,5~3mm 進入 undercut 的也拿掉
最後除了 posterior area , 再均勻拿掉 0.5mm
Holes : palate of tray ( if soft tissue mobile, relief residual ridge)
Mandibular
wax spacer:1 mm
below the mylohyoid ridge; on crest and slopes of the residual ridge
buccal shelf uncovered Handles:
20 mm height
anterior teeth
1st molar region
border modeling
wax left tray trim to 2 mm Shorter than limiting Structure
Movements,
lip: 外上內
buccal frenum : 外上內前後
Cheek 頰上內
閉口
舌 : 伸、頂 palate
開口
Evaluation
必須能舌舔 vermilion border 時 , tray 無明顯 移位。
移除 wax 和修掉 0.5mm molding material
alveolar groove 和 retromolar pad 上每 10mm 打洞
Custom tray for RPD
Diagnostic cast
A new impression in a rigid stock tray must be made if extensive surgery and extractions were performed after making the diagnostic cast A duplicate of the diagnostic cast should be made, on which the individual tray can be fabricated
maxillary
Outline tray border
Wax spacer 2~3 m shorter than outline no wax over posterior palatal seal expose incisal edges of central incisor bevel wax
block undercut
If use alginate=>additional wax on teeth If rubber base or silicone=> 省略
Release agent
maxillary
Tray fabrication with handle
Peel wax out
rounding border of the tray
Holes: alginate: at 5 mm interval ; throughout tray except alveolar groove area (for lock material) mercaptan rubbers (polysulfide): (polysulfide) only median raphe and incisive papilla (for relief)
mandibular
Wax spacer does not cover the buccal shelf region (these areas provide the primary support for the mandibular RPD)
Holes: alginate=>throughout tray alginate mercaptan rubber(polysulfide) => only alveolar groove (for relief)
如果不使用 secondary impression technique, 則 使用 individual tray 印模可視為做活動假牙的 必要步驟
Tray design
British Dental Journal 187, 423 - 426 (1999);The design and use of special trays in prosthodontics: guidelines to improve clinical effectiveness
國泰汐止分院 牙科第一年住院醫師 楊舒涵
Object
Improves the accuracy of an elastometric impression by limiting the volume of the material Opposite is true for reversible hydrocolloid
Tray material 1.Autopolymerizing acrylic resin 2.Thermoplastic resin 3.Photopolymerized resin
Autopolymerizing materials
Ostron
Tray resin
Thermoplastic resin Easy Tray: soften in water bath and adapted manually to the spaced cast
Vacuum formed tray: much more thicker and more rigid than those used for make provisional restorations
Light-polymerized materials
Triad VLC resin custom tray material: adapted to the spaced cast
Triad Visible Light Cure System
Outline for relief wax may be drawn on the cast, usually 2 to 3 mm short of tray border
Block out undercuts on the cast with wax or molding compound
Baseplate wax is adapted to the edentulous or partially dentulous cast for tissue relief and trimmed to the desired outline. http://trubyte.dentsply.com/pro/prod_triadcustomtray.shtml
Triad Visible Light Cure System
Paint TRIAD Model Release Agent (MRA)
TRIAD TruTray or Original Blue Tray Material. Carefully adapt it to the cast and trim with a sharp blade
attach a handle by moulding excess material
http://trubyte.dentsply.com/pro/prod_triadcustomtray.shtml
Triad Visible Light Cure System
http://trubyte.dentsply.com/pro/prod_triadcustomtray.shtml
Evaluation
Tray rigidity is important Resin thickness of 2~3mm are needed for adequate rigidity Clearance of tray and the teeth should also be 2~3mm Greater clearance is necessary for the more rigid polyether
Custom tray for FPD
Tray border
On diagnostic cast, using a pencil: approximately 5mm apically to the crest of the free gingiva Maxilla: covering the entire palate is not necessary (but necessary if removable appliance is planned) Posterior border should not extend farther than the junction of hard and soft palate
Space for impression material
Baseplate wax 2.5mm thick, trim wax margin back to pencil line just visible Or dripping cast in molten wax 3~4 times
Stopper placement
Three stops maintain even space for the impression material On non-centric cusp of teeth that will not be prepared If all teeth are involved, use larger soft tissue stop: Crest of alveolar ridge; Center of the hard palate Made by removing wax at an angle of 45 degrees to the occlusal surface
Tray fabrication
Tinfoil on wax prevent melt Gently adapt resin with consistent thickness to the cast Handle made; buccal ridges can also be added After polymerizing, trim with bur
Evaluation
Rigid; thickness 2~3mm
3~5mm cervical to gingival margin
Shaped to allow frenum, muscle attachments
Stable on cast; stoppers maintain impression thickness 2~3 mm
Handle fit between pt's lip
Pressure to prevent lifting while setting
Made 9 hours before using; or 5minutes in boiling water then cool to room temperature
Custom tray for CD
Tray border
Preliminary impression outlined with marker on the preliminary impression or poured cast
impression material and tray
ZOE: close fitting tray
elastomer, alginate: Spaced custom tray
maxillary
provide space : (not used if ZOE as impression material) baseplate wax; 1 mm thick; within outlined border ;posterior seal should not covered by wax spacer
tray: 2-3 mm thick; a stepped handle at anterior region
Premise: all denture-bearing area reflected in the tray's extension
border molding – tray preparation
Wax left when border molding
Space for border molding custom tray reduced to 2mm shorter of the reflections
Tray contains hamular notch and extend 2mm posterior to the vibrating line
Border molding
Record all simultaneously - polyether reduced insertion number avoid errors
Record in sections – stick impression compound
Section: labial =>buccal vestibule=>posterior palatal area
Border molding with polyether Adhesive
留下 wax spacer, 但把靠近 border 的修掉
混 polyether 但 catalyst 少一點
用 syringe 加在 border 和 palatal seal( 用沾水 的手塑型 )
lip 拉高 ,tray 放入
檢查 border 如果材料不夠就用手沾口水把旁 邊的材料移過來
Border molding with polyether(maxillary) @lip 上外下內拉
@frenum 外下內前後拉
@buccal flange 外下內拉
@ 張大嘴 下頷左右動
Setting 後 tray 拿出
檢查 border: 應為 rounded, 小缺陷以 polyether 補 ,tray 的過度延伸會透出 polyether. 應調整
preparing tray for final impression
remove wax , excess material
Buccal frenum 間 , flange 厚不要超過 2,5~3mm 進入 undercut 的也拿掉
最後除了 posterior area , 再均勻拿掉 0.5mm
Holes : palate of tray ( if soft tissue mobile, relief residual ridge)
Mandibular
wax spacer:1 mm
below the mylohyoid ridge; on crest and slopes of the residual ridge
buccal shelf uncovered Handles:
20 mm height
anterior teeth
1st molar region
border modeling
wax left tray trim to 2 mm Shorter than limiting Structure
Movements,
lip: 外上內
buccal frenum : 外上內前後
Cheek 頰上內
閉口
舌 : 伸、頂 palate
開口
Evaluation
必須能舌舔 vermilion border 時 , tray 無明顯 移位。
移除 wax 和修掉 0.5mm molding material
alveolar groove 和 retromolar pad 上每 10mm 打洞
Custom tray for RPD
Diagnostic cast
A new impression in a rigid stock tray must be made if extensive surgery and extractions were performed after making the diagnostic cast A duplicate of the diagnostic cast should be made, on which the individual tray can be fabricated
maxillary
Outline tray border
Wax spacer 2~3 m shorter than outline no wax over posterior palatal seal expose incisal edges of central incisor bevel wax
block undercut
If use alginate=>additional wax on teeth If rubber base or silicone=> 省略
Release agent
maxillary
Tray fabrication with handle
Peel wax out
rounding border of the tray
Holes: alginate: at 5 mm interval ; throughout tray except alveolar groove area (for lock material) mercaptan rubbers (polysulfide): (polysulfide) only median raphe and incisive papilla (for relief)
mandibular
Wax spacer does not cover the buccal shelf region (these areas provide the primary support for the mandibular RPD)
Holes: alginate=>throughout tray alginate mercaptan rubber(polysulfide) => only alveolar groove (for relief)
如果不使用 secondary impression technique, 則 使用 individual tray 印模可視為做活動假牙的 必要步驟
Tray design
British Dental Journal 187, 423 - 426 (1999);The design and use of special trays in prosthodontics: guidelines to improve clinical effectiveness
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